Case Study to EN 15316-4-2, Heat pumps

This case study demonstrates the calculation of the energy performance of a heat pump using the current draft of the revision of EN 15316-4-2 and the accompanying updated spreadsheet.  

There are several types of heat pumps resulting from the combination of heat source, heat sink and heat pumping technology. The most relevant combinations are identified and investigated in this study.

The performance of heat pumps is strongly dependent on source temperature, sink temperature, part load operation and other conditions (like defrosting), resulting in a full load COP that is currently in the range 2 to 6 in the likely operating conditions. This requires data in several testing points to identify the whole performance map of a heat pump.


The case study explores the predicted performance of heat pumps under a number of operating conditions:

  • several types of heat emitters and their sizing;
  • several relative sizing of the heat pump compared to building needs, from strongly oversized heat pumps (e.g. “boiler like” sizing), to correctly sized heat pumps and then down to undersized heat pumps (e.g. in the context of hybrid systems);
  • varying climate, from cold to warm;
  • several types of heat sources.


The calculation was performed with energy need patterns generated with the XLS on EN ISO 52016-1 and the assumption of a known flow temperature reset function based on outdoor temperature.


You can find the full document at the link below:

Report of Case Study on EN 15316-4-2, Heat pump systems