Summary of already

Summary of already performed field measurements. In order to evaluate already made field measurements in Sweden, or made by Swedish manufacturers, meetings in the project discussed earlier made field measurements. The result is that there has been a large number of field measurements made during the last decades, see Appendix 1 and references [4- 6], but few studies have had the specific goal to examine the SPF. In order to make detailed analyses of the performance, also detailed data from the measurements are needed, and this was only available in two studies, the SP study ”Erfarenheter från fältutvärdering av fem bergvärmepumpar i Sjuhärad” and the Fraunhofer study “Heat Pump Efficiency” where a number of Swedish heat pump manufacturers participated with heat pump units. For Air-air heat pumps, only one study has been found [7]. These three studies are describes more in detail below