ISO 21978:2023

Air to water heat pumps — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating

ISO 21978:2023

Name:ISO 21978:2023   Standard name:Air to water heat pumps — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating
Standard number:ISO 21978:2023   language:English language
Release Date:30-Nov-2023   technical committee:ISO/TC 86/SC 6 - Testing and rating of air-conditioners and heat pumps
Drafting committee:ISO/TC 86/SC 6 - Testing and rating of air-conditioners and heat pumps   ICS number:27.080 - Heat pumps
INTERNATIONAL ISO
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)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
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 .
...

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