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STANDARD 21978
Second edition
2023-12
Air to water heat pumps — Testing
and rating at part load conditions and
calculation of seasonal coefficient of
performance for space heating
Chauffe-eau à pompe à chaleur — Essais et détermination des
caractéristiques à charge partielle et calcul de performance
saisonnière
Reference number
ISO 21978:2023(E)
© ISO 2023
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ISO 21978:2023(E)
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© ISO 2023
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Published in Switzerland
ii
© ISO 2023 – All rights reserved
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ISO 21978:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 8
5 Installation requirements .9
5.1 Test apparatus and uncertainties of measurement . 9
5.2 Test room for the airside . 10
5.3 Installation and connection of the heat pump . 10
5.4 Installation of heat pumps consisting of several parts . 11
5.5 Environment conditions for indoor unit installation and electrical power supply
requirements . . . 11
6 Setting and part load test conditions .11
6.1 General . 11
6.2 Setting for capacity ratio . 11
6.3 Setting the external static pressure difference for ducted units . 11
6.4 Setting of units with integral pumps .12
6.5 Part load test conditions . 12
7 Space heating test .
...