BRE

Domestic Annual Heat Pump System Efficiency (DAHPSE) - Estimator - BETA

Further calculation details

To provide annual efficiency estimates, an annual combined space and hot water heating duty cycle was developed. This cycle incorporates hourly space and hot water heat load and temperature assumptions for the UK climate. It is based on the standard EN15316-4-2:2017 and the system boundary SEPEMO SPF_H4, it uses EN14825 (Ecodesign) test data - see here for background. A brief background to the calculation method's development is available here. The calculation method is available here and a detailed background document here.

The UCL Energy Institute "Final report on analysis of heat pump data from the renewable heat premium payment (RHPP) scheme", which considered field data for 700 heat pump installation sites in the UK, indicated that 36% of heat pump installations have weather compensation disabled. Therefore, the above chart enables both scenarios (on or off) to be displayed.

Domestic Annual Heat Pump System Efficiency (DAHPSE) - Estimator chart

Guidance slides

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Example 1 - Two different size heat pumps at same design flow temperature

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Example 1 - Two different size heat pumps at same design flow temperature

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Example 1 - Two different size heat pumps at same design flow temperature

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Example 2 - Same heat pump with different design flow temperature

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Example 3 - Same heat pump with weather compensation on or off

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Example heat pump performance results - Energy delivered to house

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  • X-axis: Dwelling design heat loss - This is taken from a SAP assessment as 'Heat transfer coefficient (W/K)' - Box (39) - multiplied by 24.2K
  • Y-axis: DAHPSE Annual efficiency - This is also known as SPF_H4, but is provided in percentage terms, so multiplied by 100. The Seasonal Performance Factor (SPF) is provided in accordance with the SEPEMO H4 system boundary, so includes all auxiliary electrical energy, including back-up heating and circulation pump
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  • NOTE: The graphs, images and performance estimates on this website are BRE's interpretation of publicly accessible data, which are in part based on data submitted by product manufacturers and accepted in good faith. Some of the data supplied by product manufacturers is also used for the purposes of showing compliance with the European Union's Ecodesign regulations (No 811/2013 and 813/2013) and therefore may be subject to market surveillance rules. BRE Group Limited and its subsidiaries, including but not limited to, Building Research Establishment Limited, make no representation or warranty as to the content of this website, its suitability for any use, or that it constitutes accurate data and/or advice.

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