Fans - Procedures and methods to determine and evaluate the energy efficiency of non-residential unidirectional ventilation units

This document provides procedures and methods for measuring and calculating the energy efficiency and associated characteristics of non-residential unidirectional ventilation units when driven by electric motors.
Unidirectional ventilation units include roof fans and box fans.
This document includes unidirectional ventilation units with and without filters.
Additional air treatment items are considered in this document but are excluded in the determination of the efficiency of the product.
This document does not include:
-   residential unidirectional and bidirectional ventilation units,
-   non-residential bidirectional ventilation units.
NOTE 1   Residential unidirectional ventilation units are under the remit of CEN/TC 156/WG 2.
NOTE 2   Non-residential bidirectional ventilation units are under the remit of CEN/TC 156/WG 5.

Ventilatoren - Verfahren und Methoden zur Ermittlung und Beurteilung der Energieeffizienz von Ein-Richtung-Lüftungsgeräten im Nichtwohnbereich

Dieses Dokument behandelt Verfahren und Methoden für die Messung und Berechnung des Wirkungsgrads und damit verbundener Eigenschaften von elektrisch betriebenen unidirektionalen Lüftungsgeräten im Nichtwohnbereich.
Zu unidirektionalen Lüftungsgeräten gehören Dachventilatoren und Kastenventilatoren.
Dieses Dokument umfasst unidirektionale Lüftungsgeräte mit und ohne Filter.
Zusätzliche Anlagenteile zur Luftbehandlung werden in diesem Dokument behandelt, aber bei der Bestimmung des Wirkungsgrads des Produkts ausgeschlossen.
Dieses Dokument gilt nicht für
-   unidirektionale und bidirektionale Lüftungsgeräte im Wohnbereich,
-   bidirektionale Lüftungsgeräte im Nichtwohnbereich.
ANMERKUNG 1   Unidirektionale Lüftungsgeräte im Wohnbereich fallen unter die Zuständigkeit von CEN/TC 156/WG 2
ANMERKUNG 2   Bidirektionale Lüftungsgeräte im Nichtwohnbereich fallen unter die Zuständigkeit von CEN/TC 156/WG 5.

Ventilateurs - Procédures et méthodes de détermination du rendement énergétique des unités de ventilation unidirectionnelles pour le non résidentiel

Ventilatorji - Postopki in metode za ugotavljanje in vrednotenje energijske učinkovitosti enosmernih prezračevalnih enot za prezračevanje nestanovanjskih stavb

General Information

Status
Not Published
Current Stage
4098 - Decision to abandon - Enquiry
Completion Date
15-Sep-2021

Buy Standard

Draft
prEN 17291:2018 - BARVE na PDF-str 9,10,11,12,34,35,36,37
English language
42 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 17291:2018
01-december-2018
[Not translated]

Fans - Procedures and methods to determine and evaluate the energy efficiency of non-

residential unidirectional ventilation units
Ventilatoren - Verfahren und Methoden zur Ermittlung und Beurteilung der
Energieeffizienz von Ein-Richtung-Lüftungsgeräten im Nichtwohnbereich
Ta slovenski standard je istoveten z: prEN 17291
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
oSIST prEN 17291:2018 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 17291:2018
---------------------- Page: 2 ----------------------
oSIST prEN 17291:2018
DRAFT
EUROPEAN STANDARD
prEN 17291
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2018
ICS 23.120
English Version
Fans - Procedures and methods to determine and evaluate
the energy efficiency of non-residential unidirectional
ventilation units
Ventilatoren - Verfahren und Methoden zur Ermittlung
und Beurteilung der Energieeffizienz von Ein-
Richtung-Lüftungsgeräten im Nichtwohnbereich

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 156.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
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. prEN 17291:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Requirements ................................................................................................................................................ 16

4.1 Eco-design requirements .......................................................................................................................... 16

4.1.1 General ............................................................................................................................................................. 16

4.1.2 Identify the unit and if intended to be used with a filter ............................................................... 16

4.2 Information requirements ........................................................................................................................ 17

4.2.1 General ............................................................................................................................................................. 17

4.2.2 Requirements ................................................................................................................................................ 17

5 Testing and calculation methods ............................................................................................................ 18

5.1 General ............................................................................................................................................................. 18

5.2 Test method to determine the ventilation unit efficiency (UVU efficiency) in the

reference configuration without a filter .............................................................................................. 18

5.2.1 General ............................................................................................................................................................. 18

5.2.2 Ventilation unit efficiency (UVU efficiency) ....................................................................................... 18

5.2.3 Nominal operating conditions ................................................................................................................. 19

5.3 Determination of internal specific fan power.................................................................................... 20

5.3.1 General ............................................................................................................................................................. 20

5.3.2 Internal specific fan power calculation method for reference configuration unit with

filter ................................................................................................................................................................... 20

5.3.3 Calculation with non-ventilation components .................................................................................. 21

6 Evaluation of conformity ........................................................................................................................... 21

6.1 General ............................................................................................................................................................. 21

6.2 Ventilation unit efficiency (ƞ ) ............................................................................................................... 21

6.3 Internal Specific Fan Power (SFPint) ...................................................................................................... 21

6.4 Filter monitoring .......................................................................................................................................... 22

6.5 Information requirements ........................................................................................................................ 22

7 Classification and designation ................................................................................................................. 22

8 Marking, labelling and packaging .......................................................................................................... 22

8.1 Marking ............................................................................................................................................................ 22

8.2 Product information requirements on unidirectional ventilation units ................................. 22

9 Installation and maintenance information ......................................................................................... 22

Annex A (informative) How to use the standard ............................................................................................ 24

A.1 Determine if the product is within scope and what should be applied .................................... 24

Annex B (normative) Internal specific fan power (SFP ) .......................................................................... 25

int

B.1 General ............................................................................................................................................................. 25

B.2 Method ............................................................................................................................................................. 25

B.3 Example of calculation method ............................................................................................................... 30

---------------------- Page: 4 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)

Annex C (informative) External leakage............................................................................................................ 31

C.1 General ............................................................................................................................................................. 31

C.2 Measurement ................................................................................................................................................. 31

Annex D (informative) Overall A-weighted casing sound power level................................................... 36

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

D.2 Definitions ....................................................................................................................................................... 36

D.3 Requirements ................................................................................................................................................. 37

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of EU Directive 2009/125/EC and Commission Regulation (EC) No

1253/2014 ...................................................................................................................................................... 40

Bibliography ................................................................................................................................................................. 42

---------------------- Page: 5 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
European foreword

This document (prEN 17291:2018) has been prepared by Technical Committee CEN/TC 156 “Ventilation

for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.

This document has been prepared under a standardization request given to CEN by the European

Commission and the European Free Trade Association, and supports essential requirements of

EU Directive 2009/125/EC and Commission Regulation (EC) No 1253/2014.

For relationship with EU Directive 2009/125/EC, see informative Annex ZA, which is an integral part of

this document.
---------------------- Page: 6 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
1 Scope

This document provides procedures and methods for measuring and calculating the energy efficiency and

associated characteristics of non-residential unidirectional ventilation units when driven by electric

motors.
Unidirectional ventilation units include roof fans and box fans.

This document includes unidirectional ventilation units with and without filters.

Additional air treatment items are considered in this document but are excluded in the determination of

the efficiency of the product.
This document does not include:
— residential unidirectional and bidirectional ventilation units,
— non-residential bidirectional ventilation units.

NOTE 1 Residential unidirectional ventilation units are under the remit of CEN/TC 156/WG 2.

NOTE 2 Non-residential bidirectional ventilation units are under the remit of CEN/TC 156/WG 5.

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 779, Particulate air filters for general ventilation — Determination of the filtration performance

EN 1886, Ventilation for buildings — Air handling units — Mechanical performance
EN ISO 5801, Fans — Performance testing using standardized airways (ISO 5801)

prEN 17166, Fans — Procedures and methods to determine the energy efficiency for the electrical input

power range of 125 W up to 500 kW
EN ISO 12759, Fans — Efficiency classification for fans (ISO 12759)
EN ISO 13349, Fans — Vocabulary and definitions of categories (ISO 13349)

ISO 13347 (all parts), Industrial fans — Determination of fan sound power levels under standardized

laboratory conditions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 5801 and prEN 17166 and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
---------------------- Page: 7 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
3.1
fan

rotary-bladed machine that receives mechanical energy and utilizes it by means of one or more impellers

fitted with blades to maintain a continuous flow of air or other gas passing through it and whose work

per unit mass does not normally exceed 25 kJ/kg

In this standard, the word fan means an assembly of an impeller, bearing, transmission, housing, motor

and other significant elements within a boundary as defined in prEN 17166 and a variable speed drive if

fitted
[SOURCE: EN ISO 13349:2010, definition 3.1.1]
[SOURCE: prEN 17166]
3.2
ventilation unit (VU)

electrically driven appliance equipped with at least one impeller, one motor and a casing

[SOURCE: Regulation (EU) No 1253/2014, article 2, definition (1)]
3.3
unidirectional ventilation unit (UVU)

ventilation unit producing an air flow in one direction only, either for exhaust or for supply

3.4
non-residential ventilation unit (NRVU)
3 3

ventilation unit where the maximum flow rate exceeds 250 m /h, excluding those between 250 m /h and

1 000 m /h where the manufacturer has declared it a residential ventilation unit only

Note 1 to entry: Based on definition Article 2 (3) of Regulation (EU) No 1253/2014.

3.5
housing
stationary part which interacts with the air stream passing through the impeller

Note 1 to entry: A housing could be a device around the impeller which guides the gas stream towards, through

and from the impeller.

Note 2 to entry: A housing may have additional parts included within the housing or attached to the housing to

affect the performance of the fan. Such as:
— inlet bell, also known as Venturi inlet, inlet cone, inlet radius;
— inlet guide vane;
— outlet guide vane;
— outlet diffuser.

Note 3 to entry: Additional parts are devices not listed above that provide an impact of the air power of the fan.

Note 4 to entry: A housing is also called a stator.
[SOURCE: prEN 17166:2017, definition 3.6]
---------------------- Page: 8 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
3.6
casing

element that is additional to the housing, see Figures 1, 2 and 3. The casing is all parts of the ventilation

unit in addition to the fan housing that interfere with the airflow
Key
1 impeller
2 housing
3 stator
4 motor
5 boundary
6 casing
Figure 1 — Diagram explaining casing and housing
---------------------- Page: 9 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
Key
1 impeller
3 stator
4 motor
5 boundary
6 casing
Figure 2 — NRVU-UVU with an impeller (box fan)
---------------------- Page: 10 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
Key
1 impeller
2 housing
3 stator
4 motor
5 boundary
6 casing
Figure 3 — Diagram explaining casing and housing for a roof mounted fan
Note 1 to entry: In prEN 17166 the ‘casing’ is called an ‘outer casing’.
3.7
boundary

region of the fan that encompasses the significant elements that affect the conversion of power (electrical

or mechanical) into air volume flow rate and pressure
[SOURCE: prEN 17166:2017, 5.3.2]
3.8
ventilation components
are defined in the reference configuration
3.9
additional non-ventilation components

components that are not part of the reference configuration and therefore are not part of the calculation

of SFP
int

Note 1 to entry: Additional non-ventilation components may be heating coils, cooling coils, humidifiers,

dehumidifiers, etc.
3.10
reference configuration of an NRVU-UVU

means a product configured with a casing and at least one fan with variable speed or multi-speed drive

(except for units less than 30 Watts and dual use units), and – in case the product is intended to be

equipped with a filter on the inlet-side – this filter shall be a clean filter
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (4)]
---------------------- Page: 11 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)

Note 1 to entry: For units supplying air the filter shall be grade F7 (EN 779) or have an efficiency on the

ePM10 ≥ 50 % (EN ISO 16890).

Note 2 to entry: For units exhausting air the filter shall be of an appropriate grade.

3.11
power
Key
A drive/control electrical input power (P )
1 VSD
B motor input power (Pe)
2 motor
C motor output power (P )
3 transmission
D fan shaft power (Pa)
4 bearings (and other mechaniscal parts)
E fan impeller power (Pr)
5 impeller and housing
F fan air power (P )
---------------------- Page: 12 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
Figure 4 — Power diagram of driven system
Table 1 — Relationship between powers and efficiencies
Installation category A and C B and D
Static efficiencies Total efficiencies
Powers
drive/control electrical input power η = P / P η = P / P
esd us ed ed u ed
(Ped)
motor input power (P ) η = P / P η = P / P
e es us e e u e
motor output power (P ) η = P / P η = P / P
o os us o o u o
fan shaft power (P ) η = P / P η = P / P
a as us a a u a
fan impeller power (P ) η = P / P η = P / P
r rs us r r u r
3.11.1
fan air power

also known as fan total air power; conventional output power which is the product of the mass flow rate

and the fan work per unit mass, or the product of the inlet volume flow rate, the compressibility

coefficient and the fan pressure
qp ×× k
[SOURCE: EN ISO 12759:2015, 3.3.12]
3.11.2
fan static air power
Pus

conventional output power which is the product of the mass flow rate and the fan static work per unit

mass, or the product of the inlet volume flow rate, the compressibility coefficient and the fan static

pressure
qp ×× k
sf p
[SOURCE: EN ISO 12759:2015, 3.3.13]
3.12
motor input power

electrical input power supplied at the terminals of an electric motor drive without a variable speed drive

3.13
drive control electrical input power

electrical input power measured at the input terminals to the variable speed drive of a motor

---------------------- Page: 13 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
3.14
electric input power of the ventilation unit

electrical power input of the ventilation unit including fans, motor, drives, including any motor control

equipment in the reference configuration
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (1)]

Note 1 to entry: In prEN 17166 (new fan efficiency standard) this is defined as ‘motor input power Pe if control

equipment such as a variable speed drive is not included and defined as ‘drive control electrical input power P if

control equipment such as variable speed drive is included.
3.15
nominal electric input power of fan
fan,ext

electrical power input of the fan, including any motor control equipment, measured outside of the UVU,

at the nominal flowrate and at the same speed required, when inside the unit, to provide the nominal

external pressure. It is used to calculate SFP
int

[SOURCE: adapted from Transitional method for determine of internal specific fan power of ventilation

units, SFP , Danish Technology Institute, ISBN 978087-998971-1]
int
3.16
efficiency

throughout this standard is the ratio between static air power and electrical input power

3.17
fan static efficiency

means the static efficiency at the best efficiency point as defined in Regulation (EU) No 327/2011

[SOURCE: adapted from Regulation (EU) No 327/2011]
Note 1 to entry: Referred to as ƞ and ƞ in prEN 17166.
es esd
3.18
fan efficiency
fan

air power P divided by the nominal electric input power of fan P as given by the formula;

us fan,ext
η =
fan
fan,ext

is the static efficiency including motor and drive efficiency of the individual fan(s) determined at nominal

airflow rate and speed as defined by unit test
[SOURCE: from Regulation (EU) No 1253/2014 Annex I.2 definition (2)]

Note 1 to entry: This definition is specific to Regulation (EU) No 1253/2014 and this standard. It is not the same

fan efficiency as defined in EN ISO 5801 and prEN 17166 fan efficiency standard.

Note 2 to entry: This definition of efficiency shall only be used in the determination of the SFPint of a UVU.

Note 3 to entry: This quantity in other existing EN Standards is defined fan static efficiency.

---------------------- Page: 14 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)

Note 4 to entry: Also referenced as ƞ in the transitional document (Transitional method, Danish Technology

s,fan
Institute, ISBN 978087-998971-1) of the EU.
3.19
ventilation unit efficiency (UVU efficiency)
specific minimum efficiency requirements for UVU’s

Note 1 to entry: In Regulation (EU) No 1253/2014 the term “fan efficiency” is used for “ventilation unit

efficiency”.
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (5)]
3.20
fan pressure
3.20.1
fan total pressure

For velocities (v ) which are below 65 m/s the values of total pressure and stagnation pressure are

practically the same

The fan total pressure is the difference between total pressures at the fan outlet and the fan inlet

pp − p
f tot 2 tot1
For v2.ref ≥65 m/s the total pressures shall be replaced by stagnation pressures
pp − p
f sg21sg
difference between the stagnation pressures at the fan outlet and the fan inlet

Note 1 to entry: For the establishment of the value 65 m/s see Clause 13 of EN ISO 5801:2018.

Note 2 to entry: In other standards fan total pressure is also expressed as fan pressure.

3.20.2
fan dynamic pressure
dynamic pressure of the fan, defined at the fan outlet with the average velocity
p p ρ ×
fd d22
[SOURCE: EN ISO 5801:2018, definition 3.32]
3.20.3
fan static pressure

for velocities (v ) below 65 m/s the fan static pressure is the difference between the static pressure at the

fan outlet and the total pressure at the fan inlet
= =
---------------------- Page: 15 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
p= pp − =p − p − p =p − p
fs 2 tot1 tot 2 d2 tot1 f fd
for v .ref ≥65 m/s the total pressures shall be replaced by stagnation pressures
p= pp − =p − p × f − p =p −×p f
fs 2 sg1 sg22d M2 sg1 f fd M2

difference between the static pressure at the fan outlet and the stagnation pressure at the fan inlet

Note 1 to entry: For the establishment of the value 65 m/s see Clause 13 of EN ISO 5801:2018.

3.21
static pressure difference
s,fan

is the static pressure difference of the fan inside of a UVU but measured outside of the unit at the same

speed and nominal flow rate

Note 1 to entry: Referenced as ∆p in the Regulation (EU) No 1253/2014 and the transitional methods

s,Fan
document.

[SOURCE: adapted from Transitional method for determine of internal specific fan power of ventilation

units, SFP , Danish Technology Institute, ISBN 978087-998971-1]
int
3.21.1
external static pressure
s,exts

external static pressure difference between the outlet and inlet of the unit, see Table 2

pp − p
s,ext s discharge s suction
( ) ( )
[SOURCE: Regulation (EU) No 1253/2014 Annex I.2 definition (7)]
Note 1 to entry: This does not align with EN ISO 5801.
3.22
internal pressure drop of ventilation components
s,int

sum of internal static pressure drops of ventilation components of a reference configuration of a UVU at

nominal flow rate
p p − p
s,int s,,fan s ext

Note 1 to entry: Referenced as ∆ps,int in the and the transitional methods document.

[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (9) and section 5.2.3 of the

document Transitional method, Danish Technology Institute, ISBN 978087-998971-1]
3.23
internal pressure drop of additional non-ventilation components
s,add

sum of the static pressure drops of additional non-ventilation components not being part of the reference

configuration of a UVU at nominal flow rate
---------------------- Page: 16 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)

Note 1 to entry: Referenced as ∆p in the Regulation (EU) No 1253/2014 and the transitional methods

s,add
document.

[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (10) and section 5.2.3 of the

document Transitional method, Danish Technology Institute, ISBN 978087-998971-1]
3.24
external leakage rate

air leakage through the casing compared to the declared nominal flow rate of the NRVU-UVU. Annex C

describes a method to determine the external leakage rate
3.25
internal Specific Fan Power
SFP
int

ratio between the internal pressure drop of the ventilation components and the fan efficiency for the

reference configuration
pp−
s..fan s ext
SFP ×
int
η P
fan fan,ext

[SOURCE: adapted from “Transitional method for determination of internal specific fan power of

ventilation units”, ISBN-978-87-998971-0-0]
3.26
variable speed drive
VSD

means an electronic power converter integrated - or functioning as one system - with the motor and the

fan, that continuously adapts the electrical power supplied to the electric motor in order to control the

mechanical power output of the motor according to the torque-speed characteristic of the load being

driven by the motor
[SOURCE: adapted from new EN standard]
3.27
multi speed drive
MSD

means a fan motor that can be operated at three or more fixed speeds plus zero (off)

[SOURCE: Regulation (EU) No 1253/2014]
3.28
volume flow rate
mass flow rate divided by the density at fan inlet
q =
[SOURCE: adapted from EN ISO 5801:2018, definition 3.23]
---------------------- Page: 17 ----------------------
oSIST prEN 17291:2018
prEN 17291:2018 (E)
3.28.1
nominal flow rate
nom

declared design flow rate of a UVU at standard air conditions where the minimum fan efficiency (ƞ ) is

met at maximum rated fan speed
[SOURCE: adapted from Regulation (EU) No 1253/2014 Annex I.2 definition (6)]
3.29
face velocity

volume flow rate at the specified airway cross-section divided by the cross-sectional area, A , given by

the following formula
v =

where A is the free unit area of the filter, if fitted or intended to be fitted with a filter, or the internal

cross-sectional area of the UVU if not fitted with or intended to be fitted with a filter

[SOURCE: adapted from EN ISO 5801; average velocity at section x, and section 3.3 of the document

Transitional method, Danish Technology Institute, ISBN 978087-998971-1]

Note 1 to entry: This is the mean value, over time, of the average component of the gas velocity normal to that

section. [SOURCE: adapted from EN ISO 5801]

Note 2 to entry: Average velocity is expressed in metres per second. [SOURCE: adapted from EN ISO 5801]

4 Requirements
4.1 Eco-design requirements
4.1.1 General

All ventilation units, except dual use units, shall be equipped with a multi-speed drive or a variable speed

drive.
State the fan efficiency of the non-residential unidirectional ventilation unit.

State the internal specific fan power of ventilation components if the non-residential unidirectional

ventilation unit is intended to be used with a filter.

If the electrical input power is less than 30 Watts then the specific Eco-design requirements do not apply,

but there is a requirement to provide information, see 4.2.

UVUs shall be tested and calculated using a “reference configuration” of the product.

Dual use units shall be tested and calculated in the ventilation mode.
4.1.2 Identify the unit and if intended to be used with a filter

All UVUs having a maximum flow rate equal or larger than 1 000 m /h shall be considered NRVUs.

All UVUs having a maximum flow rate equal or less than 250 m /h shall be considered RVUs.

...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.