ISO 16494-1:2022

INTERNATIONAL ISO
STANDARD 16494-1
First edition
2022-06
Heat recovery ventilators and energy
recovery ventilators — Method of test
for performance —
Part 1:
Development of metrics for evaluation
of energy related performance
Ventilateurs-récupérateurs de chaleur et ventilateurs-récupérateurs
d'énergie — Méthode d'essai des performances —
Partie 1: Développement de paramètres pour l'évaluation des
performances énergétiques
Reference number
© ISO 2022
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Published in Switzerland
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Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.6
4.1 Symbols . 6
4.2 Subscripts . . 7
5 General test requirements . 8
5.1 Test apparatus. 8
5.2 Installation . 8
5.3 Static pressure . 8
5.4 Temperature . 8
5.5 Concentration . 8
5.6 Power input. 8
5.7 Instrument calibration . 8
6 Airflow tests .9
6.1 General conditions . 9
6.1.1 General . 9
6.1.2 Temperature conditions . 9
6.1.3 Speed control settings . 9
6.1.4 Unit operating voltage and frequency . 9
6.2 Ducted heat recovery ventilators and energy recovery ventilators . 9
6.2.1 Airflows measured . 9
6.2.2 Static pressure conditions . 9
6.2.3 Airflow measurement methods for ducted heat recovery and energy
recovery ventilators . 11
6.3 Unducted heat recovery ventilators and energy recovery ventilators .12
6.3.1 Airflow measured.12
6.3.2 Static pressure conditions .12
6.3.3 Airflow measurement methods for unducted heat recovery and energy
recovery ventilators .12
7 Tracer gas tests .12
7.1 General conditions . 12
7.2 Temperature conditions .12
7.3 Preconditions . 12
7.4 Airflow conditions .12
7.5 Unit operating voltage and frequency .12
7.6 Tracer gas measurement methods .12
8 Determination of efficiency .13
8.1 General conditions . 13
8.2 Temperature and humidity conditions: inlets to ventilator .13
8.3 Preconditions . 13
8.4 Airflow conditions . 13
8.4.1 Required rating point . .13
8.4.2 Alternate rating points . 14
8.5 Static pressure conditions: ducted heat and energy recovery ventilators . 14
8.6 Static pressure conditions: unducted heat and energy recovery ventilators . 14
8.7 Unit operating voltage and frequency . 14
8.8 Thermal performance measurement . 14
9 Performance calculations .14
9.1 Performance calculations: ducted ventilators . 14
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9.2 Performance calculations: unducted ventilators . 14
9.3 Unit exhaust air transfer ratio (UEATR) . 15
9.4 Net supply airflow . 15
9.4.1 Net supply airflow: ducted units . . 15
9.4.2 Net supply airflow: unducted units . 15
9.5 Gross effectiveness, ε . 16
9.6 Coefficient of energy (COE) . 17
9.6.1 Coefficient of energy: ducted ventilators, C . 17
COE,ducted
9.6.2 Coefficient of energy: unducted ventilators, C . 17
COE,unducted
9.7 Effective work (EW) . 18
10 Test results . .19
Annex A (informative) Airflow measurement methods for both ducted and unducted
ventilators — Test equipment .20
Annex B (normative) Decay method for measurement of net supply airflow .21
Annex C (informative) Unit exhaust air transfer ratio measurement methods .23
Annex D (informative) Thermal performance measurement .27
Annex E (informative) Example data collection and reporting sheets .31
Annex F (normative) Required instrument uncertainty .38
Annex G (informative) Construction of plenums for connection to inlets or outlets not
designed for connection of ductwork .39
Bibliography .40
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the
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