ISO 21978:2021

Heat pump water heater — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating

The document specifies test conditions for determining the seasonal performance characteristics of air source heat pump water heaters for space heating with electrically driven compressors with or without supplementary heater. The purpose of this document is to rate performance of the heat pump water heaters for space heating with no operation of any supplementary heater. In the case of heat pump water heaters for space heating consisting of several parts with refrigerant or water connections, this document applies only to those designed and supplied as a complete package. The seasonal coefficient of performance depends, inter alia, on the climate conditions and temperature regime of the space heating distribution network. This document defines: — three design conditions, each of them being characterized by a design temperature which represents the lowest temperature that can occur in that design condition; — three water temperature distribution regimes, namely "temperature application" in the text. The user of this document is free to determine the seasonal coefficient of performance for one or more of the defined design conditions and for one or more of the defined temperature applications. This document also provides a full description of three heating seasons that can be used with the associated design conditions.

Chauffe-eau à pompe à chaleur — Essais et classification à charge partielle et calcul du coefficient de performance saisonnier

General Information

• Status: Withdrawn
• Publication Date: 02-Feb-2021
• ICS: 27.080 - Heat pumps
• Technical Committee: ISO/TC 86/SC 6 - Testing and rating of air-conditioners and heat pumps
• Drafting Committee: ISO/TC 86/SC 6/WG 12 - Heat pump water heaters
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 01-Dec-2023

Relations

• Revised: 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
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21978
First edition
2021-02
Heat pump water heater — 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 classification à charge
partielle et calcul du coefficient de performance saisonnier
Reference number
ISO 21978:2021(E)
©
ISO 2021

---------------------- Page: 1 ----------------------
ISO 21978:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 21978:2021(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 and remote condenser .10
5.3 Installation and connection of the heat pump .10
5.4 Installation of heat pumps consisting of several parts .10
5.5 Environment conditions for indoor unit installation and electrical power supply
requirements .10
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 .11
6.5 Part load test conditions .12
7 Space heating test .
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21978
ISO/TC 86/SC 6
Heat pump water heater — Testing
Secretariat: JISC
and rating at part load conditions and
Voting begins on:
2020­10­30 calculation of seasonal coefficient of
performance for space heating
Voting terminates on:
2020­12­25
Chauffe-eau à pompe à chaleur — Essais et classification à charge
partielle et calcul du coefficient de performance saisonnier
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 21978:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020

---------------------- Page: 1 ----------------------
ISO/FDIS 21978:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
CH­1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 21978:2020(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 and remote condenser .10
5.3 Installation and connection of the heat pump .10
5.4 Installation of heat pumps consisting of several parts .10
5.5 Environment conditions for indoor unit installation and electrical power supply
requirements .10
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 .
...