Daylight of buildings

This European Standard specifies minimum recommendations for achieving, by means of natural light, an adequate subjective impression of lightness indoors, and for providing an adequate view out. In addition, recommendations for the duration of sunshine exposure within habitable and occupied rooms are given. This European Standard gives information on how to use daylighting to provide lighting within interiors, and how to limit glare. This European Standard defines metrics used for the evaluation of daylighting conditions and gives methods of calculation (and verification).
This standard applies to all spaces that may be regularly occupied by people for extended periods except where daylighting is contrary to the nature and role of the actual work done.
The specification of lighting requirements for humans in indoor work places including visual tasks are given in EN 12464-1 and are not part of this standard.
The specification of calculation procedures and metrics related to the energy performance of buildings are given in prEN 15603 with a more detailed of the aspects related to lighting given in EN 15193 and are not part of this standard.

Tageslicht in Gebäuden

Diese Norm legt Mindestempfehlungen fest, um in Innenräumen einen hinreichenden subjektiven Helligkeitseindruck mit Tageslicht zu erzielen und eine ausreichende Sichtverbindung nach außen herzustellen. Darüber hinaus werden Empfehlungen für die Besonnungsdauer von Wohn- und Aufenthaltsräumen aufgeführt. Die Norm gibt Hinweise für die Nutzung von Tageslicht für die Beleuchtung von Innenräume und die Begrenzung von Blendung. Diese Norm legt Metriken für die Auswertung der Tageslichtbedingungen fest und gibt Berechnungs- und Verifizierungsverfahren an.
Diese Norm gilt für alle Räume, die regelmäßig für längere Zeiträume genutzt werden, sofern das Tageslicht nicht Art und Aufgabe der Arbeit widerspricht.
Die Spezifikation der Beleuchtungsanforderungen für Menschen in Arbeitsstätten in Innenräumen, einschließlich Sehaufgaben sind in EN 12464-1 angegeben und nicht Teil dieser Norm.
Die Spezifikation der Berechnungsverfahren und Metriken in Bezug auf die Energieeffizienz von Gebäuden, sind in EN 15193 angegeben und nicht Teil dieser Norm.

L'éclairage naturel des bâtiments

La présente norme spécifie les recommandations minimales permettant d'obtenir, par le biais de la lumière naturelle, une impression subjective adéquate de clarté à l'intérieur et d'assurer une vue adéquate sur l'extérieur. En outre, les recommandations relatives à la durée d'exposition à l'ensoleillement direct à l'intérieur des locaux (ou pièces) habitables et occupés s'appliquent. La présente norme fournit des informations sur la façon d'exploiter l'éclairage naturel pour assurer l'éclairage en intérieur, ainsi que les moyens de réduire l’éblouissement. La présente norme définit les systèmes de mesure utilisés pour évaluer les conditions d'éclairage naturel et fournit les méthodes de calcul et de vérification.
La présente norme s'applique à tous les espaces pouvant être occupés par des personnes de façon régulière et sur de longues périodes, à l'exception des espaces dans lesquels l'éclairage naturel est en inadéquation avec la nature et à la fonction des travaux réalisés.
Les spécifications des exigences en matière d'éclairage vis-à-vis des personnes occupant des lieux de travail intérieurs, y compris les tâches visuelles, sont prescrites dans l'EN 12464-1 et ne font pas partie de la présente norme.
Les spécifications de méthodologies de calcul et systèmes de mesure liés à la performance énergétique des bâtiments sont prescrites dans l'EN 15193 et ne font pas partie de la présente norme.

Dnevna svetloba v stavbah

Ta evropski standard določa minimalna priporočila za doseganje ustreznega subjektivnega vtisa svetlosti v zaprtih prostorih z naravno svetlobo in za zagotavljanje ustreznega razgleda. Poleg tega so podana priporočila za trajanje izpostavljenosti soncu v bivalnih in zasedenih prostorih. Ta evropski standard vsebuje informacije, kako z dnevno svetlobo osvetliti notranjost prostorov in kako omejiti bleščanje. Ta evropski standard določa meritve, ki se uporabljajo za vrednotenje pogojev dnevne svetlobe, in zagotavlja metode izračuna (ter preverjanja). Ta standard velja za vse prostore, ki jih ljudje redno zasedajo dalj časa, razen če je dnevna svetloba v nasprotju z naravo in vlogo dejansko opravljenega dela. Specifikacija zahtev razsvetljave za ljudi na delovnih mestih v zaprtih prostorih, vključno z vizualnimi nalogami, je podana v standardu EN 12464-1 in ni del tega standarda. Specifikacija računskih postopkov in meritev, povezanih z energijsko učinkovitostjo stavb, je podana v standardu prEN 15603 z več podrobnostmi v zvezi z razsvetljavo, podanimi v EN 15193, in ni del tega standarda.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2016
Publication Date
06-Feb-2019
Current Stage
6100 - Translation of adopted SIST standards (Adopted Project)
Start Date
19-Apr-2019
Due Date
17-Apr-2020
Completion Date
18-Nov-2019

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SLOVENSKI STANDARD
SIST EN 17037:2019
01-marec-2019
Dnevna svetloba v stavbah
Daylight of buildings
Tageslicht in Gebäuden
L'éclairage naturel des bâtiments
Ta slovenski standard je istoveten z: EN 17037:2018
ICS:
91.160.01 Razsvetljava na splošno Lighting in general
SIST EN 17037:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17037:2019
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SIST EN 17037:2019
EN 17037
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 91.160.01
English Version
Daylight in buildings
L'éclairage naturel des bâtiments Tageslicht in Gebäuden
This European Standard was approved by CEN on 29 July 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17037:2018 E

worldwide for CEN national Members.
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SIST EN 17037:2019
EN 17037:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 7

4 Symbols and abbreviations ...................................................................................................................... 10

5 Assessment of daylight in interior spaces ........................................................................................... 12

5.1 Daylight Provision ....................................................................................................................................... 12

5.1.1 General ............................................................................................................................................................. 12

5.1.2 Criteria for daylight provision................................................................................................................. 12

5.1.3 Daylight Provision Calculation Methods .............................................................................................. 12

5.1.4 Verification of daylight provision .......................................................................................................... 13

5.2 Assessment for view out ............................................................................................................................ 13

5.2.1 General ............................................................................................................................................................. 13

5.2.2 Criteria for view out .................................................................................................................................... 14

5.2.3 Verification of view out .............................................................................................................................. 14

5.3 Exposure to sunlight ................................................................................................................................... 14

5.3.1 General ............................................................................................................................................................. 14

5.3.2 Criteria for exposure to sunlight ............................................................................................................ 14

5.3.3 Verification of sunlight duration ............................................................................................................ 14

5.4 Protection from glare ................................................................................................................................. 14

5.4.1 General ............................................................................................................................................................. 14

5.4.2 Criteria for protection from glare .......................................................................................................... 15

5.4.3 Verification for protection from glare .................................................................................................. 15

Annex A (informative) Recommendations ......................................................................................................... 16

A.1 General ............................................................................................................................................................. 16

A.2 Recommendations for daylight provision in a space ...................................................................... 16

A.3 Recommendations for view ...................................................................................................................... 20

A.4 Recommendation for exposure to sunlight ........................................................................................ 21

A.5 Recommendation for glare protection ................................................................................................. 21

Annex B (informative) Daylight ............................................................................................................................. 23

B.1 General ............................................................................................................................................................. 23

B.2 Calculation grids ........................................................................................................................................... 23

B.3 Calculation methods .................................................................................................................................... 24

B.3.1 General ............................................................................................................................................................. 24

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SIST EN 17037:2019
EN 17037:2018 (E)

B.3.2 Calculation method using daylight factor (method 1) .................................................................... 24

B.3.3 Calculation method using illuminance level (method 2) ............................................................... 25

B.4 Daylight availability ..................................................................................................................................... 25

B.5 Validation of actual daylighting performance ................................................................................... 26

Annex C (informative) View out .............................................................................................................................. 27

C.1 General ............................................................................................................................................................. 27

C.2 Quality of view out ........................................................................................................................................ 27

C.3 Width of view out .......................................................................................................................................... 27

C.4 Verification of view ...................................................................................................................................... 32

C.4.1 Simplified verification method ................................................................................................................ 32

C.4.2 Advanced verification method ................................................................................................................. 33

Annex D (informative) Exposure to sunlight ..................................................................................................... 36

D.1 General ............................................................................................................................................................. 36

D.2 Principle of assessment of hours of sunlight ...................................................................................... 36

D.3 Method using software ............................................................................................................................... 38

D.4 Method using manual geometric constructions ................................................................................ 40

D.5 Determination of the position of the sun in the sky ......................................................................... 40

D.6 Evaluation rules for sunlight duration ................................................................................................. 45

D.7 Sunlight duration in the reference point P .......................................................................................... 46

D.7.1 Example ............................................................................................................................................................ 46

D.7.2 Calculation....................................................................................................................................................... 46

D.7.3 Result ................................................................................................................................................................ 47

D.8 On-site verification of duration of exposure to sunlight ................................................................ 48

Annex E (informative) Glare .................................................................................................................................... 50

E.1 General ............................................................................................................................................................. 50

E.2 Daylight Glare Probability ......................................................................................................................... 50

E.3 Annual evaluation ........................................................................................................................................ 51

E.3.1 General ............................................................................................................................................................. 51

E.3.2 Simplified annual glare evaluation ........................................................................................................ 52

E.3.2.1 General ............................................................................................................................................................. 52

E.3.2.2 Solar protection device being opaque in the extended and close position ............................. 53

E.3.2.3 Solar protection device where the curtain is made of textile, film or perforated

opaque material ............................................................................................................................................ 53

E.3.2.4 Non-diffusing glazing device with a low variable light transmittance (e.g.

electrochromic glazing).............................................................................................................................. 56

E.3.2.5 Sunshine zones .............................................................................................................................................. 58

E.4 Reflections or veiling glare ....................................................................................................................... 59

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EN 17037:2018 (E)

E.5 Verification of the glare protection capability of shadings ........................................................... 59

Annex F (informative) A–deviations ..................................................................................................................... 62

Bibliography ................................................................................................................................................................. 63

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SIST EN 17037:2019
EN 17037:2018 (E)
European foreword

This document (EN 17037:2018) has been prepared by Technical Committee CEN/TC 169 “Light and

Lighting”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2019, and conflicting national standards shall be

withdrawn at the latest by June 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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SIST EN 17037:2019
EN 17037:2018 (E)
Introduction

Daylight should be a significant source of illumination for all spaces with daylight opening(s). Daylight

is strongly favoured by building occupants as a way to adequately illuminate the indoor surfaces, and to

save energy for electrical lighting.

Daylight can provide significant quantities of light indoors, with high colour rendering and variability,

changing through the day and the seasons. Daylight openings provide views and connection to the

outside and contribute to the psychological well-being of occupants. A daylight opening can also

provide exposure to sunlight indoors, which is important, for example, in dwellings, hospital wards and

nurseries. In a space, where activities comparable to reading, writing or using display devices are

carried out, a shading device should be provided to reduce visual discomfort. The standard addresses

daylighting performance over the year. Daylight should illuminate spaces during a significant fraction of

the annual daylight hours over the year. Daylight provision depends firstly on the availability of daylight

outside (i.e. the prevailing climate at the site) and, thereafter, the environment surrounding the

building, the components immediate around the daylight opening and the configuration of the interior

spaces.

This standard encourages building designers to assess and ensure successfully daylit spaces. It also

allows building designers and developers to target ambitions with respect to daylighting, as well as

addressing other issues related to daylight design, such as view out, protection against glare, and

exposure to sunlight.
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SIST EN 17037:2019
EN 17037:2018 (E)
1 Scope

This document specifies elements for achieving, by means of natural light, an adequate subjective

impression of lightness indoors, and for providing an adequate view out. In addition, recommendations

for the duration of sunshine exposure within occupied rooms are given.

This document gives information on how to use daylighting to provide lighting within interiors, and

how to limit glare. This document defines metrics used for the evaluation of daylighting conditions and

gives principles of calculation and verification. These principles allow to address the issue of variability

of daylight over the days and the year.

This document applies to all spaces that may be regularly occupied by people for extended periods

except where daylighting is contrary to the nature and role of the actual work done.

The specification of lighting requirements for humans in indoor work places including visual tasks are

given in EN 12464-1 and are not part of this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 12216, Shutters, external blinds, internal blinds — Terminology, glossary and definitions

EN 12464-1, Light and lighting — Lighting of work places — Part 1: Indoor work places

EN 12665:2018, Light and lighting — Basic terms and criteria for specifying lighting requirements

EN 14501:2005, Blinds and shutters — Thermal and visual comfort — Performance characteristics and

classification
ISO 15469:2004, Spatial distribution of daylight — CIE standard general sky
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 12665:2018 and the following

apply.
3.1
daylight
visible part of global solar radiation

Note 1 to entry: Also defined as part of global solar radiation capable of causing a visual sensation [CIE

ILV 278].
[SOURCE: EN 12665:2018, 3.4.7, modified – note to entry added]
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SIST EN 17037:2019
EN 17037:2018 (E)
3.2
daylight factor

ratio of the illuminance at a point on a given plane due to the light received directly or indirectly from a

sky of assumed or known luminance distribution, to the illuminance on a horizontal plane due to an

unobstructed hemisphere of this sky, excluding the contribution of direct sunlight to both illuminances

Note 1 to entry: Glazing, dirt effects, etc. are included.

Note 2 to entry: When calculating the lighting of interiors, the contribution of direct sunlight needs to

be considered separately.

Note 3 to entry: The term daylight factor is normally used when considering an overcast sky as sky

type 1 or 16 in ISO 15469.
[SOURCE: EN 12665:2018, 3.4.8, CIE ILV 17-279, modified – note 3 to entry added]
3.3
daylight opening

any area in the building envelope that is capable of admitting daylight to an interior

3.4
daylight provision

level of illuminance achieved across a fraction of a reference plane for a fraction of daylight hours

within a space
3.5
diffuse horizontal illuminance (from the sky)
illuminance produced by skylight on a horizontal surface on the Earth
[SOURCE: CIE ILV 17-302]
3.6
discomfort glare
glare that causes discomfort without necessarily impairing the vision of objects
[SOURCE: EN 12665:2018, 3.2.23, CIE ILV 17-333]
3.7
glare

condition of vision in which there is discomfort or a reduction in the ability to see details or objects,

caused by an unsuitable distribution or range of luminance, or by extreme contrasts

[SOURCE: EN 12665:2018, 3.1.8, CIE ILV 17-492]
3.8
global horizontal illuminance
illuminance produced by daylight on a horizontal surface on the Earth
[SOURCE: CIE ILV 17-495]
3.9
no-ground line for view

divider between the part of the space from which the ground can be seen directly by a sitting person

and the part from which it cannot
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SIST EN 17037:2019
EN 17037:2018 (E)
3.10
no-sky line for view

divider between the part of the space from which the sky can be seen directly by a sitting person and

the part from which it cannot
3.11
obstruction
anything outside a building which prevents the direct view of part of the sky
[SOURCE: CIE ILV 17-834]
3.12
outside distance of view

distance from the inner surface of view opening to opposite major obstructions located in front of the

opening
3.13
reference plane

plane in a space on which illuminances and/or daylight factors are calculated, specified or measured

3.14
reference point for view
position from which the view is assessed
3.15
skylight
part of sky radiation capable of causing a visual sensation
[SOURCE: CIE ILV 17-1194]
3.16
solar altitude

vertical angle between the line passing through the centre of the solar disc and the horizontal plane

measured from the reference/observation point
3.17
solar azimuth

horizontal angle between vertical plane passing through the geographical north and vertical plane

passing through the centre of the solar disc

Note 1 to entry: Solar azimuth is measured clockwise from due North from 0° to 360°

3.18
sunlight
part of direct solar radiation capable of causing a visual sensation
[SOURCE: CIE ILV 17-1281]
3.19
sunlight exposure

sum of the time (hours) (e.g. on a given day) within a given period during which the sun is above the

actual horizon with a cloudless sky, which may be limited by permanent obstructions like mountains,

buildings, etc.
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SIST EN 17037:2019
EN 17037:2018 (E)
3.20
utilized area
fraction of the space intended to be occupied
3.21
veiling reflections

specular reflections that appear on the object viewed and that partially or wholly obscure the details by

reducing contrast
[SOURCE: EN 12665:2018, 3.2.24, CIE ILV 17-1396]
3.22
view

visual contact with the surrounding through an opening in the surface of a building, providing

information about the surrounding landscape/cityscape, possibility to experience the weather changes

and to follow the time over the day
3.23
view opening

any area in the building envelope admitting a view, including glazed walls, glazed doors, etc

4 Symbols and abbreviations
For the purposes of this document, the specific symbols listed in Table 1 apply.
Table 1 — Symbols and units
Symbol Name of quantity Unit
A Area of the façade 2
façade m
A Area of the glazing 2
glazing m
D Daylight factor %
DGP Daylight glare probability -
DGP DGP-value, that is not exceeded in more than 5 % of the occupation time -
e < 5 %
DGP Simplified DGP value -
DGP Threshold DGP value for a critical glare situation -
D Target daylight factor %
D Minimum target daylight factor %
D Distance from daylight opening m
ET Equation of time h
E Vertical illuminance at eye level -2
v lx (lm·m )
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SIST EN 17037:2019
EN 17037:2018 (E)
Symbol Name of quantity Unit
E Diffuse horizontal illuminance (from the sky) -2
v,d lx (lm·m )
E Median diffuse horizontal skylight illuminance -2
v,d,med lx (lm·m )
E Global horizontal illuminance -2
v,g lx (lm·m )
E Median global horizontal daylight illuminance -2
v,g,med lx (lm·m )
F Fraction of reference usage time for which a threshold value DGP is exceeded -
DGP,exceed t
F Fraction of the reference plane for target illuminance level %
plane,%
F Fraction of time for which a given value of illuminance is exceeded %
time,%
f Glazing fraction %
glaz
i Number of glare sources -

J J is the day number of the year (e.g. for 1st January, J = 1 and for 31st December, -

J = 365, February is taken to have 28 days)
LT Local clock time h
L Luminance of glare source 2
s cd/m
L Sky luminance 2
v cd/m
P Position index -
TST True solar time h
t Daylight hours h

t Time when the duration of sunlight is ending by the obstruction or when the solar h

end
azimuth α reaches the end of the acceptance angle α
s a
t Time when the sun rays begin to reach reference point h
start
α Acceptance angle degrees
α Angle of obstruction degrees
obs
α Solar azimuth (measured clockwise from due North) degrees
α Azimuth angle of daylight opening normal, measured from South degrees
wn,s
γ Solar altitude degrees
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SIST EN 17037:2019
EN 17037:2018 (E)
Symbol Name of quantity Unit
γ Minimum Solar altitude degrees
s,min
Δ Declination of the sun degrees
Λ Geographical longitude of the site East (+) or West (-) of Greenwich degrees
λ Longitude of standard meridian degrees
τ Normal-hemispherical light transmittance of the glazing -
glazing
τ Normal-diffuse light transmittance -
v,n-dif
τ Normal-normal light transmittance -
v,n-n
φ Geographical latitude of the site degrees
ω Solid angle subtended by the glare source sr

ω The hour angle ω is counted from the meridian as positive towards the afternoon degrees

η η
and negative towards the morning.
5 Assessment of daylight in interior spaces
5.1 Daylight Provision
5.1.1 General

Daylight can contribute significantly to the lighting needs of any type of building. This means that

daylight openings should have appropriate areas to provide sufficient daylight throughout the year.

Thus, the evaluation of daylight provision should make account of the availability of daylight at the site

in addition to accounting for the properties of the space (e.g. external obstruction, glazing

transmittance, thickness of walls and roofs, internal partition and surface reflectance, funitures).

5.1.2 Criteria for daylight provision

A space is considered to provide adequate daylight if a target illuminance level is achieved across a

fraction of the reference plane within a space for at least half of the daylight hours.

In addition, for spaces with vertical or inclined daylight openings, a minimum target illuminance level is

also to be achieved across the reference plane.

The reference plane of the space is located 0,85 m above the floor, unless otherwise specified. A small

fraction of the reference plane may be disregarded to account for singularities.

Values for target illuminances, minimum target illuminances and fractions of reference plane are given

in Table A.1.
5.1.3 Daylight Provision Calculation Methods

The following methods to assess daylight provision to the interior, using validated software, are

possible:
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SIST EN 17037:2019
EN 17037:2018 (E)

Method 1) Calculation method using daylight factors on the reference plane. Annex A gives values for

target daylight factors (D ) and minimum target daylight factors (D ) to be achieved depending on

T TM
the given site.

Method 2) Calculation method of illuminance levels on the reference plane using climatic data for the

given site and an adequate time step. Annex A gives values for target illuminances and minimum target

illuminances to be achieve.

Annex B describes recommendations for the daylight calculations using the two methods.

5.1.4 Verification of daylight provision

Verification of daylight provision can be determined using either an adequate software or on site

measurements.

The procedure by software requires a representative model of the space together with the key

parameters (such as any significant nearby obstructions, the assigned surface reflectance values and

glazing transmissivity) that are a reasonable representation of those for the actual, completed building.

This can be determined using either Method 1 or Method 2 described in 5.1.3.

On site, it can also be verified using illuminance meters, to measure the distribution of the daylight

factor in the actual, completed building. It needs to be conducted at grid points of the reference plane

(see B.2) Methods for verification are described in Annex B.
5.2 Assessment for view out
5.2.1 General

View to the outside provides visual connection with the surroundings to supply information about the

local environment, weather changes and the time of day. This information can relieve the fatigue

associated with long periods of being indoors. All occupants of a space should have the opportunity for

the refreshment and relaxation afforded by a change of scene and focus. View to the outside should be

assessed from selected reference points corresponding to where peop
...

SLOVENSKI
SIST EN 17037
STANDARD
marec 2019
Dnevna svetloba v stavbah
Daylight of buildings
Tageslicht in Gebäuden
L'éclairage naturel des bâtiments
Referenčna oznaka
ICS 91.160.01 SIST EN 17037:2019 (sl)
Nadaljevanje na straneh II in od 1 do 60

© 2019-12. Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17037 : 2019
NACIONALNI UVOD

Standard SIST EN 17037 (sl), Dnevna svetloba v stavbah, 2019, ima status slovenskega standarda in

je istoveten evropskemu standardu EN 17037 (en), Daylight of buildings, 2018.
NACIONALNI PREDGOVOR

Evropski standard EN 17037:2018 je pripravil tehnični odbor Evropskega komiteja za standardizacijo

CEN/TC 169 Svetloba in razsvetljava v gradbeništvu, katerega tajništvo je v pristojnosti DIN. Slovenski

standard SIST EN 17037:2019 je prevod evropskega standarda EN 17037:2018. V primeru spora glede

besedila slovenskega prevoda v tem standardu je odločilen izvirni evropski standard v angleškem jeziku.

Odločitev za privzem tega standarda je dne 28. januarja 2019 sprejel SIST/TC STV Steklo, svetloba in

razsvetljava v gradbeništvu.
ZVEZA Z NACIONALNIMI STANDARDI

S privzemom tega evropskega standarda veljajo za omejeni namen referenčnih standardov vsi

standardi, navedeni v izvirniku, razen tistih, ki so že sprejeti v nacionalno standardizacijo:

SIST EN 12216 Polkna, zunanja in notranja senčila – Terminologija, slovar in definicije

SIST EN 12464-1 Svetloba in razsvetljava – Razsvetljava na delovnem mestu – 1. del: Notranji

delovni prostori

SIST EN 12665 Svetloba in razsvetljava – Osnovni izrazi in merila za specifikacijo zahtev za

razsvetljavo

SIST EN 14501 Rolete in polokna – Toplotno in vizualno ugodje – Delovne karakteristike in

klasifikacija
OSNOVA ZA IZDAJO STANDARDA
– privzem standarda EN 17037:2018
OPOMBE

– Povsod, kjer se v besedilu standarda uporablja izraz "evropski standard", v SIST EN 17037:2019

to pomeni "slovenski standard".
– Nacionalni uvod in nacionalni predgovor nista sestavni del standarda.

– Ta nacionalni dokument je enakovreden EN 17037:2018 in je objavljen z dovoljenjem

CEN-CENELEC
Upravni center
Rue de la Science 23
B-1040 Bruselj

This national document is identical with EN 17037:2018 and is published with the permission of

CEN-CENELEC
Management Centre
Rue de la Science 23
B-1040 Brussels
---------------------- Page: 2 ----------------------
EVROPSKI STANDARD EN 17037
EUROPEAN STANDARD
NORME EUROPÉENNE
december 2018
EUROPÄISCHE NORM
ICS 91.160.01
Slovenska izdaja
Dnevna svetloba v stavbah
Daylight of buildings L'éclairage naturel des Tageslicht in Gebäuden
bâtiments
Ta evropski standard je CEN sprejel 29. julija 2018.

Člani CEN morajo izpolnjevati notranje predpise CEN/CENELEC, ki določajo pogoje, pod katerimi dobi

ta standard status nacionalnega standarda brez kakršnihkoli sprememb. Seznami najnovejših izdaj teh

nacionalnih standardov in njihovi bibliografski podatki so na voljo pri Upravnem centru CEN-CENELEC

ali članih CEN.

Ta evropski standard obstaja v treh uradnih izdajah (angleški, francoski in nemški). Izdaje v drugih

jezikih, ki jih člani CEN na lastno odgovornost prevedejo in izdajo ter prijavijo pri Upravnem centru CEN-

CENELEC, veljajo kot uradne izdaje.

Člani CEN so nacionalni organi za standarde Avstrije, Belgije, Bolgarije, Cipra, Češke republike,

Danske, Estonije, Finske, Francije, Grčije, Hrvaške, Irske, Islandije, Italije, Latvije, Litve, Luksemburga,

Madžarske, Malte, Nekdanje jugoslovanske republike Makedonije, Nemčije, Nizozemske, Norveške,

Poljske, Portugalske, Romunije, Srbije, Slovaške, Slovenije, Španije, Švedske, Švice, Turčije in

Združenega kraljestva.
CEN
Evropski komite za standardizacijo
European Committee for Standardisation
Comité Européen de Normalisation
Europäisches Komitee für Normung
Upravni center CEN-CENELEC: Rue de la Science 23, B-1040 Brussels

© 2018 CEN Lastnice avtorskih pravic so vse države članice CEN Ref. oznaka EN 17037:2018 E

---------------------- Page: 3 ----------------------
SIST EN 17037 : 2019
Evropski predgovor

Ta dokument (EN 17037:2018) je pripravil tehnični odbor CEN/TC 169 Svetloba in razsvetljava,

katerega sekretariat vodi DIN.

Ta evropski standard mora dobiti status nacionalnega standarda bodisi z objavo istovetnega besedila

ali z razglasitvijo najpozneje do junija 2019, nacionalni standardi, ki so z njim v nasprotju, pa morajo biti

razveljavljeni najpozneje do junija 2019.

Opozoriti je treba na možnost, da so lahko nekateri elementi tega dokumenta predmet patentnih pravic.

CEN (in/ali CENELEC) ne prevzema odgovornosti za identifikacijo katerihkoli ali vseh takih patentnih

pravic.

V skladu z notranjimi predpisi CEN/CENELEC morajo ta evropski standard obvezno uvesti nacionalne

organizacije za standardizacijo naslednjih držav: Avstrije, Belgije, Bolgarije, Cipra, Češke republike,

Danske, Estonije, Finske, Francije, Grčije, Hrvaške, Irske, Islandije, Italije, Latvije, Litve, Luksemburga,

Madžarske, Malte, Nekdanje jugoslovanske republike Makedonije, Nemčije, Nizozemske, Norveške,

Poljske, Portugalske, Romunije, Slovaške, Slovenije, Srbije, Španije, Švedske, Švice, Turčije in

Združenega kraljestva.
---------------------- Page: 4 ----------------------
SIST EN 17037 : 2019
VSEBINA Stran

Evropski predgovor .................................................................................................................................. 2

Uvod ........................................................................................................................................................ 7

1 Področje uporabe ................................................................................................................................. 5

2 Zveze s standardi ................................................................................................................................. 6

3 Izrazi in definicije .................................................................................................................................. 6

4 Simboli in okrajšave ............................................................................................................................... 8

5 Ocenjevanje dnevne svetlobe v notranjih prostorih ............................................................................ 10

5.1 Osvetljevanje z dnevno svetlobo ...................................................................................................... 10

5.1.1 Splošno .......................................................................................................................................... 10

5.1.2 Merila za osvetljevanje z dnevno svetlobo .................................................................................... 10

5.1.3 Postopki za izračun osvetljevanja z dnevno svetlobo ................................................................... 10

5.1.4 Preverjanje osvetljevanja z dnevno svetlobo ................................................................................ 11

5.2 Ocenjevanje pogleda navzven ......................................................................................................... 11

5.2.1 Splošno .......................................................................................................................................... 11

5.2.2 Merila glede pogleda navzven ....................................................................................................... 11

5.2.3 Preverjanje pogleda navzven ........................................................................................................ 12

5.3 Trajanje osončenosti ........................................................................................................................ 12

5.3.1 Splošno .......................................................................................................................................... 12

5.3.2 Merila za trajanje osončenosti ...................................................................................................... 12

5.3.3 Preverjanje trajanja osončenosti ................................................................................................... 12

5.4 Zaščita pred bleščanjem .................................................................................................................. 12

5.4.1 Splošno .......................................................................................................................................... 12

5.4.2 Merila za zaščito pred bleščanjem ................................................................................................ 13

5.4.3 Preverjanje zaščite pred bleščanjem ............................................................................................. 13

Dodatek A (informativni): Priporočila ...................................................................................................... 14

A.1 Splošno ............................................................................................................................................ 14

A.2 Priporočila za osvetljevanje z dnevno svetlobo v prostoru .............................................................. 14

A.3 Priporočila za pogled navzven ......................................................................................................... 18

A.4 Priporočila za trajanje osončenosti ................................................................................................. 18

A.5 Priporočila za zaščito pred bleščanjem ............................................................................................ 19

Dodatek B (informativni): Dnevna svetloba ............................................................................................ 20

B.1 Splošno ............................................................................................................................................ 20

B.2 Mreže za izračun .............................................................................................................................. 20

B.3 Računski postopki ............................................................................................................................ 21

B.3.1 Splošno ........................................................................................................................................ 21

B.3.2 Računski postopek z uporabo faktorja dnevne svetlobe (postopek 1) ......................................... 21

B.3.3 Računski postopek z uporabo ravni osvetljenosti (postopek 2) .................................................... 22

B.4 Razpoložljivost dnevne svetlobe ...................................................................................................... 22

B.5 Validacija dejanskega dnevnega osvetljevanja ............................................................................... 23

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SIST EN 17037 : 2019

Dodatek C (informativni): Pogled navzven ............................................................................................. 24

C.1 Splošno ............................................................................................................................................ 24

C.2 Kakovost pogleda navzven .............................................................................................................. 24

C.3 Širina pogleda navzven.................................................................................................................... 24

C.4 Preverjanje pogleda navzven .......................................................................................................... 29

C.4.1 Poenostavljeni postopek preverjanja ............................................................................................ 29

C.4.2 Napredni postopek preverjanja ..................................................................................................... 30

Dodatek D (informativni): Trajanje osončenosti .................................................................................... 33

D.1 Splošno ............................................................................................................................................ 33

D.2 Način izračuna trajanja osončenosti ................................................................................................ 33

D.3 Postopek z uporabo programske opreme........................................................................................ 35

D.4 Postopek z uporabo ročnega konstruiranja geometrije ................................................................... 37

D.5 Določanje položaja Sonca na nebu ................................................................................................. 37

D.6 Pravila za vrednotenje trajanja osončenosti .................................................................................... 42

D.7 Trajanje osončenosti na referenčni točki P ...................................................................................... 43

D.7.1 Primer ........................................................................................................................................... 43

D.7.2 Izračun .......................................................................................................................................... 44

D.7.3 Rezultat ......................................................................................................................................... 44

D.8 Preizkus trajanja osončenosti na kraju samem ............................................................................... 45

Dodatek E (informativni): Bleščanje ....................................................................................................... 47

E.1 Splošno ............................................................................................................................................ 47

E.2 Verjetnost pojava bleščanja zaradi dnevne svetlobe ....................................................................... 47

E.3 Letno vrednotenje bleščanja ............................................................................................................ 48

E.3.1 Splošno ......................................................................................................................................... 48

E.3.2 Poenostavljeno letno vrednotenje bleščanja ................................................................................ 49

E.3.2.1 Splošno ...................................................................................................................................... 49

E.3.2.2 Senčilo, ki je v spuščenem in zaprtem položaju nepresevno .................................................... 50

E.3.2.3 Senčila, ki so izdelana iz tkanine, folije ali perforiranega nepresevnega materiala ................... 50

E.3.2.4 Nedifuzna zasteklitev z nizko spremenljivostjo svetlobne presevnosti

(npr. elektrokromna zasteklitev) ........................................................................................................ 53

E.3.2.5 Cone osončenosti ...................................................................................................................... 55

E.4 Odsevi ali zastirajoče bleščanje ...................................................................................................... 56

E.5 Preverjanje učinkovitosti senčil za zaščito pred bleščanjem ........................................................... 56

Dodatek F (informativni): A-deviacije ..................................................................................................... 59

Literatura ................................................................................................................................................ 60

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SIST EN 17037 : 2019
Uvod

Dnevna svetloba je pomemben vir osvetlitve v vseh prostorih s svetlobnimi odprtinami. Uporabniki stavb

so naklonjeni dnevni svetlobi kot viru, ki ustrezno osvetljuje notranje površine in zmanjšuje porabo

električne energije za razsvetljavo.

Dnevna svetloba lahko v prostoru zagotovi znatno količino svetlobe, ki ima kakovostno barvno

reprodukcijo in se spreminja v teku dneva in letnih časov. Svetlobne odprtine zagotavljajo pogled

navzven in povezavo z zunanjostjo ter prispevajo k psihološkemu dobremu počutju uporabnikov.

Svetlobna odprtina lahko zagotovi tudi trajanje osončenosti notranjih prostorov, kar je pomembno na

primer v stanovanjih, bolnišničnih oddelkih in vrtcih. V prostorih, kjer se izvajajo dejavnosti, kot je pisanje

ali uporaba naprav za prikazovanje, je za zmanjšanje vidnega neugodja treba zagotoviti senčila.

Standard obravnava dnevno osvetljevanje med letom. Prostori naj bodo osvetljeni z dnevno svetlobo v

velikem deležu letnih svetlih ur. Osvetljevanje z dnevno svetlobo je odvisno predvsem od razpoložljivosti

dnevne svetlobe zunaj (tj. od prevladujočih podnebnih razmer na kraju), okolice stavbe, elementov

neposredno ob svetlobni odprtini in zasnove notranjih prostorov.

Standard spodbuja projektante, da izračunajo in zagotovijo uspešno dnevno osvetljevanje prostorov.

Prav tako omogoča projektantom in investitorjem, da si zastavijo cilje na področju dnevnega

osvetljevanja in drugih vprašanj, povezanih z dnevno svetlobo, kot so pogled navzven, zaščita pred

bleščanjem in trajanje osončenosti.
---------------------- Page: 7 ----------------------
SIST EN 17037 : 2019
1 Področje uporabe

Ta standard opredeljuje dejavnike za doseganje ustreznega subjektivnega vtisa dnevne osvetljenosti

notranjih prostorov z naravno svetlobo in za zagotavljanje primernega pogleda navzven. Poleg tega

podaja tudi priporočila za trajanje osončenosti v bivalnih prostorih.

Standard podaja informacije, kako uporabiti dnevno svetlobo za razsvetljavo notranjih prostorov in kako

omejiti bleščanje. Standard tudi opredeljuje merske enote, ki se uporabljajo za vrednotenje pogojev

dnevnega osvetljevanja, ter določa postopke za izračun in preverjanje. Ti postopki omogočajo

obravnavanje spremenljivosti dnevne svetlobe preko dneva in leta.

Standard se uporablja za vse prostore, ki jih ljudje lahko redno in dlje časa uporabljajo, razen kadar je

dnevna svetloba v nasprotju z naravo in načinom opravljanja dejanskega dela.

Zahteve za razsvetljavo notranjih delovnih mest za ljudi, vključno z vidnimi nalogami, so podane v EN

12464-1 in niso del tega standarda.
2 Zveze s standardi

Za uporabo tega dokumenta so nujno potrebni spodaj navedeni referenčni dokumenti. Pri datiranih

sklicevanjih se uporablja le navedena izdaja. Pri nedatiranih sklicevanjih se uporablja zadnja izdaja

publikacije, na katero se sklicuje (skupaj z dopolnili).

EN 12216 Polkna, zunanja in notranja senčila – Terminologija, slovar in definicije

EN 12464-1 Svetloba in razsvetljava – Razsvetljava na delovnem mestu – 1. del: Notranji

delovni prostori

EN 12665:2018 Svetloba in razsvetljava – Osnovni izrazi in merila za specifikacijo zahtev za

razsvetljavo

EN 14501:2005 Senčila in polkna – Toplotno in vizualno ugodje – Lastnosti in klasifikacija

ISO 15469:2004 Prostorska porazdelitev dnevne svetlobe – Standardno splošno nebo CIE

3 Izrazi in definicije

V tem standardu veljajo izrazi in definicije iz standarda EN 12665:2018 in naslednji:

3.1
dnevna svetloba
vidni del globalnega sončnega sevanja

OPOMBA: Opredeljena je tudi kot del globalnega sončnega sevanja, ki lahko sproži občutek vida [CIE ILV 278].

[VIR: EN 12665:2018, spremenjen – dodana opomba]
3.2
faktor dnevne svetlobe

razmerje med osvetljenostjo točke na dani ravnini zaradi svetlobe, ki jo prejme neposredno ali posredno

od neba z domnevno ali poznano razporeditvijo svetlosti, in osvetljenostjo horizontalne ravnine zaradi

nezastrte hemisfere tega neba, razen prispevka neposredne sončne svetlobe k obema osvetljenostma

OPOMBA 1: Upoštevajo se zasteklitev, vpliv umazanosti stekel itd.

OPOMBA 2: Pri izračunu razsvetljave notranjih prostorov je treba neposredno sončno svetlobo obravnavati ločeno.

OPOMBA 3: Izraz faktor dnevne svetlobe se navadno uporablja ob upoštevanju oblačnega neba, kot sta npr. tipa neba 1 ali

16, definirana v ISO 15469.
---------------------- Page: 8 ----------------------
SIST EN 17037 : 2019

[VIR: EN 12665:2018, 3.4.8, CIE ILV 17-279, spremenjen – dodana je tretja opomba]

3.3
svetlobna odprtina (odprtina za dnevno svetlobo)

katerakoli površina v stavbnem ovoju, ki lahko prepušča dnevno svetlobo v notranji prostor

3.4
osvetljevanje z dnevno svetlobo

raven osvetljenosti, dosežena na delu referenčne ravnine v prostoru v času svetlega dela dneva

3.5
difuzna horizontalna osvetljenost (z neba)
osvetljenost na horizontalni ravnini Zemlje, ki jo povzroča svetloba neba
[VIR: CIE ILV 17-302]
3.6
neugodno bleščanje
bleščanje, ki vzbuja neugodje, ni pa nujno, da zmanjšuje vidnost objektov
[VIR: EN 12665:2018, 3.2.23, CIE ILV 17-333]
3.7
bleščanje

pogoj vidnosti, ko zaradi neprimerne porazdelitve svetlosti ali prevelikih kontrastov pride do neugodja

ali zmanjšanja sposobnosti videti podrobnosti ali objekte
[VIR: EN 12665:2018, 3.1.8, CIE ILV 17-492]
3.8
globalna horizontalna osvetljenost
osvetljenost na horizontalni površini Zemlje, ki jo povzroča dnevna svetloba
[VIR: CIE ILV 17-495]
3.9
ločnica pogleda navzven brez pogleda na tla

ločnica med delom prostora, od koder sedeča oseba lahko neposredno vidi zunanje talne površine, in

delom prostora, od koder jih ne more videti
3.10
ločnica pogleda navzven brez pogleda na nebo

ločnica med delom prostora, od koder sedeča oseba lahko neposredno vidi nebo, in delom, od koder

ga ne more videti
3.11
ovira
karkoli zunaj stavbe, kar preprečuje neposreden pogled na del neba
[VIR: CIE ILV 17-834]
3.12
globina pogleda

razdalja od notranje površine odprtine za pogled navzven do večjih ovir pred to odprtino

3.13
referenčna ravnina

ravnina v prostoru, na kateri se izračuna, določi ali izmeri osvetljenost in/ali faktor dnevne svetlobe

---------------------- Page: 9 ----------------------
SIST EN 17037 : 2019
3.14
referenčna točka pogleda navzven
položaj, s katerega se presoja pogled navzven
3.15
svetloba neba
del sevanja neba, ki lahko sproži vidno zaznavanje
[VIR: CIE ILV 17-1194]
3.16
višinski kot Sonca

vertikalni kot med črto skozi središče Sončevega diska in horizontalno ravnino, izmerjen v referenčni

točki oziroma opazovališču
3.17
azimut Sonca

horizontalni kot med vertikalno ravnino skozi geografski sever in vertikalno ravnino skozi središče

Sončevega diska
OPOMBA: Azimut Sonca se meri v smeri urnega kazalca od severa od 0° do 360°.
3.18
sončna svetloba
del neposrednega sončnega sevanja, ki lahko povzroči vidno zaznavanje
[VIR: CIE ILV 17-1281]
3.19
trajanje osončenosti

seštevek časa (v urah) v določenem časovnem obdobju (npr. na določen dan) pri jasnem nebu, ko je

Sonce nad dejanskim horizontom in ki je lahko omejen s trajnimi ovirami, kot so gore, stavbe itd.

3.20
uporabna površina
del prostora, namenjen uporabi
3.21
zastirajoče odsevanje

zrcalni odsevi na opazovanih objektih, ki z zmanjšanjem kontrasta delno ali popolno zakrijejo

podrobnosti
[VIR: EN 12665:2018, 3.2.24, CIE ILV 17-1396]
3.22
pogled navzven

vidni stik z okolico skozi odprtino v stavbnem ovoju, ki zagotavlja informacije o pokrajini/urbanem okolju

in ki omogoča spremljanje vremenskih sprememb ter minevanja časa v dnevu
3.23
odprtina za pogled navzven

katerakoli površina v stavbnem ovoju, vključno s steklenimi stenami, steklenimi vrati ipd., ki omogoča

pogled navzven
---------------------- Page: 10 ----------------------
SIST EN 17037 : 2019
4 Simboli in okrajšave
V tem dokumentu se uporabljajo simboli, navedeni v preglednici 1.
Preglednica 1: Simboli in enote
Simbol Ime veličine Enota
facade površina fasade m
Aglazing površina zasteklitve m
D faktor dnevne svetlobe %
DGP verjetnost bleščanja zaradi dnevne svetlobe -
DGP e ˂ 5 % vrednost DGP, ki ni presežena več kot 5 % časa zasedenosti -
DGP poenostavljena vrednost DGP
s -
DGPt mejna vrednost DGP za kritičen pojav bleščanja -
D ciljni faktor dnevne svetlobe %
DTM najmanjši ciljni faktor dnevne svetlobe %
D razdalja do svetlobne odprtine m
časovna enačba h
Ev vertikalna osvetljenost na višini oči lx (lm ꞏ m )
E difuzna horizontalna osvetljenost (z neba) lx (lm ꞏ m )
v,d
Ev,d,med srednja difuzna horizontalna osvetljenost s svetlobo neba lx (lm ꞏ m )
E globalna horizontalna osvetljenost lx (lm ꞏ m )
v,g

v,g,med srednja globalna horizontalna osvetljenost z dnevno svetlobo lx (lm ꞏ m )

FDGP,exceed delež referenčnega časa uporabe, v katerem je presežena mejna vrednost -

DGPt
F delež referenčne ravnine, na kateri mora biti dosežena ciljna raven %
plane,%
osvetljenosti
Ftime,% delež časa, v katerem je presežena dana vrednost osvetljenosti %
Ƒglaz delež zasteklitve %
i število virov bleščanja -
J zaporedna številka dneva v letu (npr. za prvi januar je J = 1, za 31. december
J = 356, za februar se šteje, da ima 28 dni)
LT lokalni čas h
s svetlost vira bleščanja cd/m
Lv svetlost neba cd/m
P kazalnik položaja -
TST pravi Sončev čas h
t število ur h
---------------------- Page: 11 ----------------------
SIST EN 17037 : 2019
Simbol Ime veličine Enota
tend čas, ko trajanje osončenosti preneha zaradi ovire ali ko azimut Sonca αs h
doseže mejno vrednost sprejemljivega kota αa
tstart čas, ko sončni žarki dosežejo referenčno točko h
a sprejemljivi kot stopinja
αobst kot ovire stopinja
α azimut Sonca, merjen v smeri urnega kazalca (od smeri sever) stopinja
αwn,s azimut normale svetlobne odprtine, merjen od smeri jug stopinja
ϒs višinski kot Sonca stopinja
s,min najmanjši višinski kot Sonca stopinja
Δ deklinacija Sonca stopinja

Λ zemljepisna dolžina, vzhodno od Greenwicha (+) in zahodno od Greenwicha stopinja

(-)
s zemljepisna dolžina standardnega poldnevnika stopinja
normalna-hemisferna svetlobna presevnost zasteklitve -
τglazing
normalna-difuzna svetlobna presevnost -
τv,n-dif
τ normalna-normalna svetlobna presevnost -
v,n-n
φ zemljepisna širina kraja stopinja
s prostorski kot, pod katerim je viden vir bleščanja sr

ωη urni kot ωη se šteje od poldnevnika kot pozitiven proti popoldnevu in negativen stopinja

proti dopoldnevu
5 Ocenjevanje dnevne svetlobe v notranjih prostorih
5.1 Osvetljevanje z dnevno svetlobo
5.1.1 Splošno

Dnevna svetloba lahko znatno prispeva k zadovoljevanju potreb po razsvetljavi v katerikoli vrsti stavbe.

To pomeni, da naj imajo svetlobne odprtine primerno velike površine, da je zagotovljena zadostna

dnevna svetloba med letom. Zato naj ovrednotenje osvetljevanja z dnevno svetlobo poleg lastnosti

prostora upošteva razpoložljivost dnevne svetlobe na kraju (npr. zunanje ovire, presevnost zasteklitve,

debelino sten in strehe, notranje delitve prostora, refleksivnost površin, pohištvo).

5.1.2 Merila za osvetljevanje z dnevno svetlobo

Da je prostor primerno dnevno osvetljen, se šteje, če je ciljna raven osvetljenosti na deležu referenčne

ravnine v prostoru dosežena najmanj polovico svetlega dela dneva.

V prostorih z vertikalnimi ali poševnimi svetlobnimi odprtinami mora biti najmanjša ciljna osvetljenost

dosežena na celotni referenčni ravnini.

Če ni določeno drugače, se referenčna ravnina prostora nahaja 0,85 m nad tlemi. Manjši delež

referenčne ravnine (npr. manjša odstopanja in nepravilnosti) se lahko zanemari.
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Vrednosti ciljnih ravni osvetljenosti, najmanjših ciljnih ravni osvetljenosti in deležev referenčne ravnine

so podane v preglednici A.1.
5.1.3 Postopki za izračun osvetljevanja z dnevno svetlobo

Za ocenitev osvetljevanja z dnevno svetlobo v notranjih prostorih z validirano programsko opremo se

uporabljata naslednja postopka:

Postopek 1): Računski postopek z uporabo faktorjev dnevne svetlobe na referenčni ravnini. Dodatek

A podaja vrednosti za ciljne faktorje dnevne svetlobe (D ) in najmanjše ciljne faktorje dnevne svetlobe

(D ), ki jih je treba doseči na določenem kraju.

Postopek 2): Postopek za izračun ravni osvetljenosti na referenčni ravnini z uporabo krajevnih

podnebnih podatkov in primernega časovnega koraka. V dodatku A so podane vrednosti za ciljne ravni

osvetljenosti in najmanjše ciljne ravni osvetljenosti, ki jih je treba doseči.

V dodatku B so podana priporočila za izračune dnevne svetlobe z obema računskima postopkoma.

5.1.4 Preverjanje osvetljevanja z dnevno svetlobo

Preverjanje osvetljevanja z dnevno svetlobo se lahko izvede z ustrezno programsko opremo ali

meritvami na kraju samem.

Pri uporabi programske opreme je treba izdelati reprezentativni model prostora s ključnimi parametri

(bistvene bližnje ovire, opredeljena odsevnost površin in presevnost zasteklitve), ki smiselno prikažejo

stvarno, zgrajeno stavbo. Preverjanje se lahko izvede z uporabo postopkov 1 ali 2, opisanih v 5.1.3.

Na kraju samem se osvetljevanje z dnevno svetlobo lahko preveri tudi z merilniki osvetljenosti, s

pomočjo katerih se izmeri porazdelitev faktorja dnevne svetlobe v stvarni, zgrajeni stavbi. Meritve je

treba izvesti v točkah v mreži na referenčni ravnini (glej B.2)
...

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