ISO 21978:2021

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

Published By	Publication Date	Number of Pages
ISO	2021-02	54

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Categories: 27.080 - Heat pumps, ISO

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Description

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.

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	2021-02
Pages Count	54
Language	English
Edition	1
File Size	3.4 MB
ICS Codes	27.080 - Heat pumps

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ISO 21978:2021

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