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      • Home
      • ICS
      • Energy And Heat Transfer Engineering
      • Heat Pumps
      • ISO 21978:2021

      Codes & Standards - Purchase

      ISO 21978:2021

      Heat pump water heater — Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating
      SKU: iso_071639_171471 Published by ISO Publication Year 2021 1 Edition 47 pages

      Product Details

      • Overview
      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.

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      GST REG No R119441681
      QST REG No R1006017360

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