24 June 2014

FIELD MEASUREMENTS OF GROUND SOURCE HEAT PUMP SYSTEMS INSTALLED IN EXISTING SINGLE FAMILY HOUSES


Field measurements are ongoing, for a period of two years, of the performance of twenty heat pump systems used for space heating and tap water heating in single-family houses. The heat pumps were installed during 2003 – 2007, replacing either oil or electrical heating in houses built between 1940 and 1980. The primary objective is to obtain knowledge about the
heat pump efficiency, SPF, energy savings and CO2 reductions. It is also interesting to elucidate the difference in efficiency between the old heat pumps in this study and those
modern heat pumps of best available technique measured in the Swedish contribution to IEA HPP Annex 37. The results in this field study correspond well to results from SCOPcalculations
based on laboratory tests performed 2005 in SP’s laboratory according to
EN14511. The results from Annex 37 and laboratory tests performed 2012 show an evolution forward and modern heat pumps are more energy efficient. The total heat supplied differs
considerably between households. The heat pump technology saves purchased energy and reduces CO2 emissions compared with the replaced heating system. In most cases, the
energy savings are between 60 and 70%, and in a few cases between 50 and 60%. The corresponding figures for the good examples in Annex 37 are 67-75%.