EN 15193:2007

Energy performance of buildings - Energy requirements for lighting

This European Standard specifies the calculation methodology for the evaluation of the amount of energy used for indoor lighting inside the building and provides a numeric indicator for lighting energy requirements used for certification purposes. This European Standard can be used for existing buildings and for the design of new or renovated buildings. It also provides reference schemes to base the targets for energy allocated for lighting usage. This European Standard also provides a methodology for the calculation of instantaneous lighting energy use for the estimation of the total energy performance of the building. Parasitic powers not included in the luminaire are excluded.
In this European Standard, the buildings are classified in the following categories: offices, education buildings, hospitals, hotels, restaurants, sports facilities, wholesale and retail services and manufacturing factories.
In some locations outside lighting may be fed with power from the building. This lighting may be used for illumination of the façade, open-air car park lighting, security lighting, garden lighting etc. These lighting systems may consume significant energy and if they are fed from the building, this load will not be included in the Lighting Energy Numeric Indicator or into the values used for heating and cooling load estimate. If metering of the lighting load is employed, these loads may be included in the measured lighting energy.

Energetische Bewertung von Gebäuden - Energetische Anforderungen an die Beleuchtung

Diese Europäische Norm legt die Berechnungsmethodik für die Bewertung der Energiemenge fest, die zur Innenraumbeleuchtung innerhalb von Gebäuden benötigt wird, und stellt die numerischen Kenngröße für den Beleuchtungsenergiebedarf bereit, die für Zertifizierungszwecke benötigt wird. Diese Norm kann auf bestehende Gebäude und für die Planung von neuen oder zu sanierenden Gebäuden angewendet werden. Sie stellt Referenzverfahren zur Verfügung, um Vorgaben für den Energieverbrauch zu begründen, der der Beleuchtung zuzuordnen ist. Diese Norm stellt auch eine Methodik zur Berechnung des momentanen Energiebedarfs für Beleuchtungszwecke für das Gesamtenergiebilanzierungsverfahren des Gebäudes zur Verfügung.
In dieser Europäischen Norm werden Gebäude in folgende Kategorien eingeteilt: Bürogebäude, Bildungsstätten, Kranken¬häuser, Hotels, Restaurants, Sportstätten, Groß- und Einzelhandelsgeschäfte und Produktionsbetriebe.
Mancherorts kann die Energie für die Außenbeleuchtung vom Gebäude her bereitgestellt werden. Diese Beleuchtung kann für die Ausleuchtung von Fassaden, zur Parkplatzbeleuchtung, Sicherheitsbeleuchtung, Gartenbeleuchtung etc. verwendet werden. Diese Beleuchtungssysteme können eine signifikante Energiemenge verbrauchen und wenn diese vom Gebäude her geliefert wird, so wird diese Belastung weder bei der numerischen Kenngröße für die Beleuchtungsenergie noch bei Werten für die Bestimmung von Heiz- und Kühllasten berücksichtigt. Falls Erfassungen des Stromverbrauchs für die Beleuchtung durchgeführt werden, so können diese in der gemessenen Beleuchtungsenergie enthalten sein.

Performance énergétique des bâtiments - Exigences énergétiques pour l'éclairage

La présente Norme européenne spécifie la méthodologie de calcul permettant d’évaluer la quantité d’énergie utilisée pour l’éclairage intérieur d’un bâtiment et fournit un indicateur numérique pour les exigences énergétiques en matière d’éclairage appliquées en vue de la certification. La présente Norme européenne peut être utilisée pour les bâtiments existants et pour la conception de bâtiments neufs ou rénovés. Elle présente également des projets de référence pour fixer les bases des objectifs énergétiques affectées à l’éclairage. La présente Norme européenne fournit également une méthodologie pour le calcul de la consommation instantanée d’énergie d’éclairage permettant d’estimer la performance énergétique globale du bâtiment. Les puissances auxiliaires non incluses dans le luminaire sont exclues.
Dans la présente Norme européenne, les bâtiments sont classés dans les catégories suivantes : bureaux, établissements d’enseignement, établissements sanitaires, hôtellerie, restauration, établissements sportifs, commerces (services de vente en gros et au détail) et usines de fabrication.
A certains emplacements, la puissance provenant du bâtiment peut alimenter l’éclairage extérieur. Cet éclairage peut être utilisé pour éclairer la façade, un parc de stationnement en plein air, assurer un éclairage de sécurité, de jardin, etc. Ces systèmes d’éclairage peuvent consommer une quantité importante d’énergie et, lorsqu’ils sont alimentés par le bâtiment, cette charge ne sera pas intégrée à l’indicateur numérique de l’énergie d’éclairage ou aux valeurs utilisées pour l’estimation de la charge de chauffage et de refroidissement. En cas de mesurage de la charge d’éclairage, ces charges peuvent être incluses dans l’énergie d’éclairage mesurée.

Energijske značilnosti stavb - Energijske zahteve za osvetlitev

Ta evropski standard določa metodologijo izračunavanja za ocenjevanje količine energije, ki se uporablja za notranjo osvetlitev v stavbah, in podaja numerični pokazatelj energijskih zahtev za osvetlitev, ki se uporablja za namene certifikacije. Ta evropski standard se lahko uporablja za obstoječe stavbe in za načrtovanje novih ali obnovljenih stavb. Prav tako podaja referenčne sheme kot osnovo za ciljne količine energije, namenjene za osvetlitev. Ta evropski standard tudi podaja metodologijo za izračunavanje trenutne porabe energije za osvetlitev za oceno celotnih energijskih lastnosti stavbe. Parazitska energija, ki ni zajeta v osvetlitev, je izključena. V tem evropskem standardu so stavbe razvrščene v naslednje kategorije: pisarne, šole, bolnišnice, hoteli, restavracije, športni objekti,  velikoprodajne in maloprodajne storitve in proizvodne tovarne. Na nekaterih lokacijah se zunanja osvetlitev lahko napaja z energijo iz stavbe. Ta osvetlitev se lahko uporabi za osvetlitev fasade, osvetlitev parkirišč na prostem, varnostno osvetlitev, vrtno osvetlitev, itd. Ti sistemi osvetlitve lahko porabijo precej energije, in če se napajajo iz stavbe, se ta obremenitev ne bo vključila v numerični pokazatelj energijskih zahtev za osvetlitev (LENI) ali v vrednosti, ki se uporabljajo za ocene obremenitve ogrevanja in hlajenja. Če se uporabi merjenje obremenitve osvetlitve, se te obremenitve lahko vključijo v merjeno energijo za osvetlitev.

General Information

• Status: Withdrawn
• Publication Date: 25-Sep-2007
• Withdrawal Date: 13-Apr-2025
• ICS: 91.140.99 - Other installations in buildings
• ICS: 91.160.10 - Interior lighting
• Technical Committee: CEN/TC 169 - Lighting applications
• Drafting Committee: CEN/TC 169 - Lighting applications
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 19-Apr-2017
• Completion Date: 14-Apr-2025
• Mandate: M/343 - Mandate to CEN, CENELEC and ETSI for the elaboration and adoption of standards for a methodology calculating the integrated energy performance of buildings and estimating the environmental impact, in accordance with the terms set forth in Directive 2002/91/EC
• Ref Project: SIST EN 15193:2007 - Energy performance of buildings - Energy requirements for lighting

Relations

• Replaced By: EN 15193-1:2017 - Energy performance of buildings - Energy requirements for lighting - Part 1: Specifications, Module M9
• Effective Date: 25-Jul-2012
• Corrected By: EN 15193:2007/AC:2010 - Energy performance of buildings - Energy requirements for lighting
• Effective Date: 08-Jun-2022

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Energetische Bewertung von Gebäuden - Energetische Anforderungen an die BeleuchtungPerformance énergétique des bâtiments - Exigences énergétiques pour l'éclairageEnergy performance of buildings - Energy requirements for lighting91.160.10Notranja razsvetljavaInterior lighting91.120.10Toplotna izolacija stavbThermal insulationICS:Ta slovenski standard je istoveten z:EN 15193:2007SIST EN 15193:2007en01-december-2007SIST EN 15193:2007SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15193September 2007ICS 91.140.99; 91.160.10 English VersionEnergy performance of buildings - Energy requirements forlightingPerformance énergétique des bâtiments - Exigencesénergétiques pour l'éclairageEnergetische Bewertung von Gebäuden - EnergetischeAnforderungen an die BeleuchtungThis European Standard was approved by CEN on 15 March 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15193:2007: ESIST EN 15193:2007

Metering of lighting circuit.17 Annex B (informative)
Measurement method of total power of luminaires and associated parasitic power.20 B.1 Introduction.20 B.2 Test measurement of luminaire power during normal operation.20 B.3 Standard test conditions.20 B.4 Electrical measuring instruments.20 B.5 Test luminaires.20 B.6 Test voltage.20 B.7 Luminaire power (Pi).21 B.8 Luminaire parasitic power with lamps off (Ppi).21 B.9 Emergency lighting luminaire parasitic input power (Pei).21 B.10 Lighting controls standby parasitic power (Pci).21 B.11 Default luminaire power for existing lighting installations.21 B.12 Default parasitic energy for existing lighting installations.21 Annex C (informative)
Determination of the daylight dependency factor FD,n.22 C.1 General.22 C.2 Building segmentation: Spaces benefiting from daylight.24 C.3 Daylight supply.27 C.3.1 Vertical façades.27 SIST EN 15193:2007

Determination of occupancy dependency factor FO.54 D.1 Introduction.54 D.2 Detailed determination of FO.54 D.3 Motivation for the choice of FO functions.59 Annex E (informative)
Determination of the constant illuminance factor FC.61 E.1 Introduction.61 E.2 Power for constant illuminance factor.61 E.3 Constant illuminance factor (Fc).61 Annex F (informative)
Benchmark values and lighting design criteria.63 Annex G (informative)
Default values.66 G.1 The default values for annual operating hours relating to building type are given in Table G.1.66 Annex H (informative)
Other considerations.68 H.1 Individual dimming.68 H.2 Algorithmic lighting.68 H.3 Light pipes.68 H.4 Lighting installations with scene setting.69 H.5 Daylight guidance.69 H.5.1 Vertical façades.69 H.5.2 Rooflights.70 Annex I (informative)
List of Symbols.73 Bibliography.77
3.3.1 luminaire power (Pi) electrical power from the mains supply consumed by the lamp(s), control gear and control circuit in or associated with the luminaire, measured in watts which includes any parasitic power when the luminaire is turned on NOTE The rated luminaire power (Pi) for a specific luminaire may be obtained from the luminaire manufacturer. 3.3.2 total installed lighting power in the room or zone (Pn) power of all luminaires in the room or zone, measured in watts niiPP=∑[W]
(1) 3.3.3 parasitic power 3.3.3.1 luminaire parasitic power (PPi) electrical power from the mains supply consumed by the charging circuit of emergency lighting luminaires and the standby power for automatic controls in the luminaire when lamps are not operating, measured in watts Ppi = Pci + Pei [W] (2) 3.3.3.2 parasitic power of the controls only during the time with the lamps off (Pci) stand-by power for any controls and/or any battery charging power consumed by an emergency lighting system when the luminaire is turned off, measured in watts 3.3.3.3 emergency lighting charging power (Pei) input power to the charging circuit of emergency luminaires when the lamps are not operating, measured in watts 3.3.4 total installed parasitic power of the controls in the room or zone (Ppc) input power of all control systems in luminaires in the room or zone when the lamps are not operating, measured in watts pcciiPP=∑ [W] (3) SIST EN 15193:2007

[W]
(4) 3.4 energy
3.4.1 total energy used for lighting (Wt) energy consumed in period t, by the sum of the luminaires when the lamps are operating, plus the parasitic loads when the lamps are not operating, in a room or zone, measured in kWh 3.4.2 energy consumption used for illumination (WL,t) energy consumed in period t, by the luminaire when the lamps are operating to fulfil the illumination function and purpose in the building, measured in kWh 3.4.3 luminaire parasitic energy consumption (WP,t) parasitic energy consumed in period t, by the charging circuit of emergency lighting luminaire and by the standby control system controlling the luminaires when the lamps are not operating, measured in kWh 3.5 time 3.5.1 operating time (t) time period for the energy consumption measured in hours [h] 3.5.2 annual operating time (to) annual number of operating hours of the lamp(s) and luminaires with the lamps operating
to = tD + tN [h] (5) NOTE This number is determined depending on the building use. 3.5.3 standard year time (ty) time taken for one standard year to pass, taken as 8 760 h 3.5.4 daylight time usage (tD) operating hours during the daylight time, measured in hours SIST EN 15193:2007

3.7.1 daylight dependency factor (FD) factor relating the usage of the total installed lighting power to daylight availability in the room or zone 3.7.2 occupancy dependency factor (FO) factor relating the usage of the total installed lighting power to occupancy period in the room or zone 3.7.3 absence factor (FA) factor relating to the period of absence of occupants 3.7.4 constant illuminance factor (FC) factor relating to the usage of the total installed power when constant illuminance control is in operation in the room or zone 3.8 Maintenance Factor (MF) ratio of the average illuminance on the working plane after a certain period of use of a lighting installation to the initial average illuminance obtained under the same conditions for the installation NOTE CIE 97 gives further information. 3.9 Lighting Energy Numeric Indicator (LENI) numeric indicator of the total annual lighting energy required in the building and given in kWh (m2 x year) SIST EN 15193:2007

Wt = WL,t + WP,t
[kWh]
(6) where An estimate of the lighting energy required to fulfil the illumination function and purpose in the building (WL,t) shall be established using the following equation:
WL,t = ∑{ (Pn x Fc) × [(tD × Fo × FD) + (tN × Fo)]}/1 000 [kWh]
(7) An estimate of the parasitic energy (WP,t) required to provide charging energy for emergency lighting and for standby energy for lighting controls in the building shall be established using the following equation:
WP,t = ∑{{Ppc × [ty – (tD + tN)]} + (Pem × te)}/1 000 [kWh]
(8) NOTE 1 The total lighting energy can be estimated for any required period t (hourly, daily, weekly, monthly or annually) in accordance with the time interval of the dependency factors used. NOTE 2
For existing buildings, WP,t and WL,t, can be established more accurately by directly and separately metering the energy supplied to the lighting (see Clause 5). NOTE 3 This estimation does not include the power consumed by control systems remote from the luminaire and not drawing power from the luminaire. Where known this should be added. NOTE 4 Equation (8) does not include the power consumed by a central battery emergency lighting system. 4.1.2 Total annual energy used for lighting W = WL + WP [kWh/year]
(9) where
An estimate of the annual lighting energy required to fulfil the illumination function and purpose in the building (WL) and annual parasitic energy (WP) required to provide charging energy for emergency lighting and for standby energy for lighting controls in the building shall be established by Equations (7) and (8) respectively.
4.2 Lighting Energy Numeric Indicator (LENI) Lighting Energy Numeric Indicator for the building shall be established using the following equation: LENI = W/A
[kWh/(m2 × year)]
(10) where SIST EN 15193:2007
is the total annual energy used for lighting [kWh/year]; A
is the total useful floor area of the building [m2]. 5 Metering 5.1 General The lighting consumption shall be separately measured using one of the following methods: a) kWh meters on dedicated lighting circuits in the electrical distribution; b) local power meters coupled to or integrated in the lighting controllers of a lighting management system; c) a lighting management system that can calculate the local consumed energy and make this information available to a building management system (BMS); d) a lighting management system that can calculate the consumed energy per building section and make this information available in an exportable format, e.g. a spread sheet format; e) a lighting management system that logs the hours run, the proportionality (dimming level) and relates this to its internal data base on installed load. NOTE The measured value may be compared with the real kilowatt hours consumption measured during commissioning of the building. 5.2 Load segregation The network of a BMS/lighting management system shall provide the same function in segregation as in the power distribution. 5.3 Remote metering a. Remote metering is recommended for buildings having completely segregated power distribution systems. b. Remote metering in buildings can also be used for more intelligent (lighting management) systems to provide data. NOTE Annex A gives examples of metering methods. 6 Calculation of lighting energy in buildings 6.1 Installed lighting power 6.1.1 General There are two forms of installed power in buildings, luminaire power and parasitic power. Luminaire power, which provides power for functional illumination shall conform to EN 12193 for lighting of sports facilities and EN 12464-1 for lighting of indoor work places. SIST EN 15193:2007

= 1F
=1- (F
x F
)For each monthDetermine Monthly daylight supply factorF
month = FDetermine impact for control systemFD,SD,SI
=
OCompute Transparency IndexI
= TCompute Depth Index(Equation C8)(Equation C6)I
= De(Equation C7)Determine Daylight Penetration I(Table C1 b))Determine Daylight Supply F(Table C2 a))NoI
= 1OF
month = 1 - ( F
x F
x C
)D,nD,SD,CD,SD,SD,nD,SD,nD,CD,C Figure 2 — Flow chart illustrating the determination of the daylight dependency factor FD,n in a zone SIST EN 15193:2007

The determination of the daylight dependency factor FD,n for the nth room or zone should be made by the methods described in Annex C for annual and monthly time period and the process illustrated in the flow chart (Figure 2). The daylight dependency factor FD,n for room or zone in the building is determined as a function of the daylight supply factor FD,S,n and the daylight dependent electric lighting control factor FD,C,n and given by the following equation: FD,n = 1 - (FD,S,n X FD,C,n)
(11) where FD,S,n
is the daylight supply factor that takes into account the general daylight supply in the zone n. It represents, for the considered time interval, the contribution of daylight to the total required illuminance in the considered zone n. See C.3.1.3 and C.3.2.2; FD,C,n
is the daylight control factor that accounts for the daylight depending electric lighting control system’s ability to exploit the daylight supply in the considered zone n see C.4. NOTE 1 FD,n can be determined for any time period (annual, monthly or hourly). The factor needs to be adjusted according to the period of the operation time at daytime tD. NOTE 2 Other daylight supply systems that rely on enhancements to increase or make possible daylight penetration beyond the perimeter zones are available. These are not explicitly covered in this European Standard but may be calculated by using daylight factors or other methods for the calculation of FD. NOTE 3 In zones without daylight availability, FD = 1. NOTE 4 The method given in Annex C can be used to consider location and climate dependent aspects of daylight supply. 6.2.2.3 Determination of occupancy dependency factor FO,n The occupancy dependency factor Fo,n for a room or zone should be determined by the methods described in Annex D. 6.2.3 Determination of constant illuminance factor Fc The determination of the constant illuminance factor Fc for a room or zone can be determined as described in Annex E. 7 Benchmark of lighting energy requirements Benchmark data of the total lighting energy requirement estimation during the design of new or refurbished buildings should be determined from a set of default values for lighting energy requirements as provided in Annex F. The data shows the potential installed power density required for lighting the specified building types. The values are based on meeting the necessary and desired lighting criteria applied to the building. The values are average for the building and can vary substantially for different rooms or zones in the building. SIST EN 15193:2007

Metering of lighting circuit 51234 Key 1
primary power 4
kWh lighting meter 2
kWh meter other circuits 5
lighting circuit 3
power circuit
Figure A.1 — kWh meters on dedicated lighting circuits in the electrical distribution In the example of Figure A.1, the kWh meter for lighting is in parallel to the kWh meter for the rest of the electrical installation. The consumption for the total building is in this case the sum of both meters. W = Wlight metered
[kWh/year]
(A.1) In the example of Figure A.2, the kWh meters for lighting distributed over the different floors are placed in series with the central kWh meter of the building. In this case the central kWh meter registers the total energy consumption including the lighting consumption. Equation for monitoring: W = Wlight metered = ∑all floors (kWh @ date – kWh @ (date – 12 months)) [kWh/year]
(A.2) Local kWh meter values (as in Figure A.2) could be read and totalled by a Building Management System. No corrections for occupancy or control types are necessary. SIST EN 15193:2007

primary power 4
power circuit 2 2
kWh meter – total power 5
kWh meter – lighting circuit 1 3
power circuit 1 6
kWh meter – lighting circuit 2 Figure A.2 — Building with segregation of lighting circuits per floor and separately measured
5512343466 Key 1
bus line 4
ampere meter 2
230 volt power 5
light controller 3
volt meter 6
luminaires
Figure A.3 — Volt and ampere meters coupled to the inputs of the lighting controllers NOTE 1 Some systems include a power factor meter. Local power meters coupled to or integrated in the lighting controllers of a lighting management system. Information on the local consumed energy is made available to a building management system. In Figure A.3, volt and ampere meters or watt meters are put on the power input of every lighting controller. The individual lighting controllers calculate the local consumed energy by integrating these values over time. These values are made available via the bus line to either the central computer of the lighting system or the central computer of the building management system. The central computer can process this SIST EN 15193:2007

[kWh/year]
(A.3) A lighting management system should log the hours run, the proportionality (dimming level) and relate this to its internal data base on installed load. The lighting management system makes this information available to a BMS for further reporting, or it can give the information in an exportable format. The lighting controller sums the time per lighting load proportionally per output and makes these values available via the bus line. NOTE 2 Energy consumption of luminaires not controlled by the lighting control system is not measured. NOTE 3 Energy consumption of luminaires indirectly controlled via external contactors is measured.
Measurement method of total power of luminaires and associated parasitic power B.1 Introduction The values of rated luminaire input power and the rated parasitic input power should be used in the calculation of the energy performance of the building with respect to lighting requirements. The rated power values should be rounded to the nearest whole number for 10 W and above and should be to two significant figures when below 10 W. Both should be within a tolerance of ± 5 % of the claimed value. B.2 Test measurement of luminaire power during normal operation The object of the test is to measure the luminaire total input power during normal operation and the associated parasitic power (the standby input power for controls, sensing devices and charge power for emergency lighting circuits) at standard reproducible conditions that are close to the conditions of service for which the luminaire is designed. Ideally, these luminaire electrical measurements should be made during photometric tests. B.3 Standard test conditions Test conditions for photometric measurements should be in accordance with EN 13032-1:2004, 5.1, 5.2 and 5.3. B.4 Electrical measuring instruments Volt meters, ampere meters and watt meters should conform to the requirements for Class Index 0,5 or better (precision grade). B.5 Test luminaires The luminaire should be representative of the manufacturer’s regular product. The luminaire should be mounted in the position in which it is designed to operate. B.6 Test voltage The test voltage at the supply terminals to the luminaire should be the rated voltage of the luminaire in accordance with EN 13032-1:2004, 5.2.2. SIST EN 15193:2007

Determination of the daylight dependency factor FD,n C.1 General This annex specifies a simplified approach for determining FD,S,n and FD,C,n and therefore FD,n. Vertical façades with fenestration and rooflight solutions are considered. The method can be applied on an annual and on a monthly basis. In accordance with 6.2.2.2, the daylight dependency factor FD,n is determined as a function of the daylight supply factor FD,S,n and the daylight dependent artificial lighting control factor FD,C,n. Therefore: FD,n = 1 – (FD,S,n × FD,C,n)
(C.1) The procedure illustrated in Figure C.1 incorporates the following 5 steps: a. segmentation of the building into zones with and without daylight access; b. determination of the impact of room parameters, façade geometry and outside obstruction on the daylight penetration into the interior space using the concept of the daylight factor; c. prediction of the energy saving potential described by the daylight supply factor FD,S,n as a function of local climate, maintained illuminance and daylight factor; d. determination of the exploitation of the available daylight by the type of lighting control by the daylight control factor FD,C,n; e. conversion of annual value FD,n to monthly values.
= 1DF
=1-F
x F DDSDCFor each monthDetermine Monthly daylight supply factorF
, month = FDetermine impact for control systemFDCDSDSI
=
OCompute Transparency IndexI
=TCompute Depth Index(Equation C8)(Equation C6)I
= De(Equation C7)Determine Daylight Penetration I(Table C1)Determine Daylight Supply F(Table C2)NoI
= 1OF
, month = 1 - ( F
x
F
x C
)DDSDCDSDS Figure C.1 — Flow chart illustrating the determination of the daylight dependency factor FD,n in a zone SIST EN 15193:2007

The maximum possible depth of zone aD,max that receives daylight through façades results as follows: aD,max = 2,5 × (hLi – hTa)
[m]
(C.2) where aD,max is the maximum depth of daylight zone [m]; hLi
is the height of lintel above floor [m]; hTa
is the height of task area (reference plane) above floor [m]. Here, the maximum depth of the daylight zone aD,max is calculated from the interior surface of the exterior wall, perpendicular towards the façade considered. If the actual depth of the zone of calculation is smaller than the calculated maximum depth of the daylight zone, the space depth can be taken as the depth of the daylight zone aD. If the actual depth of the space is less than 1,25 times the calculated maximum depth, the real depth of the space of calculation can be used for aD. Thus, the sub-area AD,j of the daylight space j results as follows: ADj = aD × bD [m2]
(C.3) where aD is the depth of daylight zone [m]; bD is the width of daylight zone [m]. Usually, the width of the daylight zone bD corresponds to the interior width of the façade of the building zone or of the sector of calculation. Internal walls may be neglected. If windows are located only in parts of the façade, the width of the daylight zone allocated to this façade corresponds to the width of the façade section containing windows, plus half the depth of the daylight zone. The geometric relations are illustrated in Figure C.2 and C.3.
1 bD 2 hTa 3 hLi 4 maxD1a 5 bR 6 aR
Figure C.2 — Large façade opening with moderate room depth SIST EN 15193:2007

14567823 Key
1 bD 2 4maxD1a 3 4maxD1a 4 hTa
5 hLi 6 4maxD1a 7 bR 8 aR
Figure C.3 — Small façade opening with larger room depth
aD,max ≤ (hR – hTa) towards the next edge of a rooflight [m].
(C.4) where hR is the clear room height of the space of calculation with rooflight [m]. For surfaces within the space of calculation not receiving any daylight: FD = 1.
(C.5) Differentiation between vertical façade and rooflight In cases of doubt whether an aperture should be treated as a window or a rooflight, any apertures where the glazed parts are located entirely above the room's ceiling, are to be classified as rooflights. C.3 Daylight supply C.3.1 Vertical façades C.3.1.1 General The daylight supply FDS,n is evaluated separately for vertical façades and rooflights. C.3.1.2 Daylight factor classification Daylight supply of a zone benefiting from daylight depends on the geometric boundary conditions described by the transparency index IT, the depth index IDe and the obstruction index IO. A. Transparency index IT The transparency index IT of the part of the building, which can bene
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