ISO 5222-1:2023

INTERNATIONAL ISO
STANDARD 5222-1
First edition
2023-08
Heat recovery ventilators and energy
recovery ventilators — Testing and
calculating methods for seasonal
performance factor —
Part 1:
Sensible heating recovery seasonal
performance factors of heat recovery
ventilators (HRV)
Ventilateurs récupérateurs de chaleur et ventilateurs récupérateurs
d'énergie — Méthodes d'essai et de calcul des facteurs de
performances saisonnières —
Partie 1: Facteurs de performances saisonnières de la récupération de
chaleur sensible des ventilateurs récupérateurs de chaleur (HRV)
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.2
5 Tests . 3
5.1 General requirements . 3
5.2 Test conditions . 3
5.3 Test methods . 3
5.3.1 General . 3
5.3.2 Energy saving stage limit temperature . 4
5.3.3 Sensible heating recovery performance test . . 4
5.3.4 Determination of bypass outdoor temperature . 4
5.3.5 Measurement of power input of heat recovery ventilator with bypass
ventilation function . 4
5.3.6 Determination of the frosting temperature by test . 5
6 Calculations . 6
6.1 Gross sensible heating recovery effectiveness (ε ) . 6
sh
6.2 Sensible heating coefficient of energy . 6
6.2.1 Sensible heating coefficient of energy: ducted ventilators . 6
6.2.2 Sensible heating coefficient of energy: unducted ventilators . 7
6.3 Calculation of seasonal performance factor of sensible heating recovery (F ) . 7
sh
6.3.1 Reference outdoor air heating load and sensible heating recovery capacity . 7
6.3.2 The characteristics of sensible heating recovery capacity against outdoor
temperature . 8
6.3.3 Power input characteristics of sensible heating recovery against outdoor
temperature . 9
6.3.4 Outdoor temperature bin distribution for heating . 10
6.3.5 Calculation of seasonal sensible heating recovery capacity (E ) . 10
sh
6.3.6 Calculation of seasonal sensible heating recovery power input (P ) . 10
in,E
6.3.7 Calculation of seasonal performance factor for sensible heating recovery
(F ) . 11
sh
7 Test report .11
Annex A (informative) The schematic diagram of HRV heating (H) operation .12
Annex B (informative) The default outdoor temperature bin distribution for heating .14
Annex C (normative) Method of determination of the temperature T .15
F,0
Annex D (informative) Calculating method for seasonal performance factor when setting a
specific application heating load .16
Annex E (normative) Calculation of the bypass outdoor temperature .18
Annex F (informative) Report template .19
Bibliography .22
iii
Foreword
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electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning,
Subcommittee SC 6, Testing and rating of air-conditioners and heat pumps.
A list of all parts in the ISO 5222 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
INTERNATIONAL STANDARD ISO 5222-1:2023(E)
Heat recovery ventilators and energy recovery
ventilators — Testing and calculating methods for seasonal
performance factor —
Part 1:
Sensible heating recovery seasonal performance factors of
heat recovery ventilators (HRV)
1 Scope
This document specifies the testing and calculating methods for sensible heating recovery seasonal
performance factor of heat recovery ventilators (HRV) covered by ISO 16494-1.
This document also specifies the test conditions and the corresponding test procedures for determining
the sensible heating recovery seasonal performance factor of HRV and is intended for use only in
marking, comparison, and certification purposes. For the purposes of this document, the rating
conditions are those specified in ISO 16494-1 and in Annex B. The procedures of this document may be
used for other temperature conditions.
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.
ISO 16494-1:2022, Heat recovery ventilators and energy recovery ventilators — Method of test for
performance — Part 1: Development of metrics for evaluation of energy related performance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16494-1 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
heat recovery
transfer of sensible energy from exhaust air to supply air in the HRV while heating
3.2
bypass ventilation function
function for reducing power input of the fans while the heat energy recovered is less than the additional
energy input due to overcoming the resistance of recovery heat exchanger during its operation time
Note 1 to entry: The bypass function makes the supply air and exhaust air go through the heat recovery exchanger
bypass with energy saving control.
3.3
coefficient of energy
total sensible heating energy exchanged between the air streams plus the power
value of moving air, divided by the power input
Note 1 to entry: The formula for determining C is given in 6.2.1 and C in 6.2.2.
sh,d,t,j sh,u,d,t,j
3.4
gross effectiveness
measured effectiveness, not adjusted for leakage, motor heat gain, or heat transfer
through the unit casing
Note 1 to entry: The sensible heating gross effectiveness of an HRV, at equal airflow, is described in
ISO 16494-1:2022, 9.5.
3.5
bypass outdoor temperature
T
b
outdoor temperature in heating conditions, at which the electric power reduction to the HRV by
operating in bypass mode is equal to the saving of electric power input to the heating system due to the
heat recovered by the HRV
3.6
seasonal performance factor of sensible heating recovery
F
sh
ratio of seasonal amount of sensible heat recovered together with power value of moving air to the
whole electricity input of HRV, under the rating conditions and seasonal outdoor temperature bins
selected from this standard
3.7
building heating balance temperature
T
BHB
outdoor air temperature at which building internal heat gain, solar radiation, and so on, equals to heat
loss through the building envelope
4 Symbols and abbreviated terms
Symbol Description Unit
E Capacity of seasonal sensible heating recovery Wh
sh
C Sensible heating coefficient of energy for ducted ventilator at outdoor air W/W
sh,d,t,j
bin temperature t
j
C Sensible heating coefficient of energy for unducted ventilator at outdoor W/W
sh,u,d,t,j
air bin temperature t
j
c Specific heat of leaving supply air (SA) kJ/kg· °C
p
L Reference outdoor air sensible heating load at outdoor air bin temperature t W
sh,t,j j
n Bin hours which the outdoor air bin temperature occurs h
j
n Number of temperature bins -
P Power input to ventilator at outdoor air bin temperature t W
in,t,j j
P Power input to the HRV to operate the fans at outdoor air bin temper
...