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  • BSI
    BS ISO 21978:2021 Heat pump water heater. Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating
    Edition: 2021
    $497.46
    / user per year

Description of BS ISO 21978:2021 2021

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.



Standard NumberBS ISO 21978:2021
TitleHeat pump water heater. Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating
StatusWithdrawn
Publication Date2021-02-04
Withdrawn Date2023-12-07
Replaced ByBS ISO 21978:2023
Identical National Standard OfISO 21978
DescriptorsHeat pumps, Water pumps, Plumbing (space-heating systems), Space-heating systems, Performance testing
ICS27.080 Heat pumps
CommitteeRHE/17
ISBN978 0 580 51562 0
PublisherBSI
Pages56

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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