Evaluation of Two Ground Source Heat Pump Systems in Nearly Zero Energy Buildings
In the future, most buildings will be nearly Zero Energy Buildings (nZEBs). Heat pumps are frequently used as heating system in Swedish single family buildings, but in most cases they are used in buildings with higher heating demand than the nZEBs of tomorrow. In this study, operation parameters such as heating water and brine temperatures were analyzed in real operation in two different nZEBs. The results show that the measured supply temperatures coincide in some cases well with what is described in the standard developed to be harmonized with the ecodesign and energy labelling regulations—EN14825, but in some cases they were higher. However, the brine temperatures were often considerably higher than the test conditions described in EN14825. The results also show how interconnection of a tank affects the operating parameters of a heat pump system. Another finding was that in order to reach the highest overall energy performance the heat pump and the heating system must be optimized together and not separately, which often is the case today.
KeywordsHeat pump nZEB Energy labelling
The study has been funded by the Swedish Energy Agency (through the research program EffsysExpand), Bosch Thermoteknik, Danfoss Heat Pumps, NIBE, Skanska and TMF companies and they are all kindly acknowledged.
- 1.C. Wemhöner, R. Kluser, in Heat pump concepts for Nearly Zero Energy Buildings—Interim results of IEA HPP Annex 40, IEA Heat Pump Conference 2014, Montreal (2014)Google Scholar
- 2.M. Persson, S. Ruud, J. Benson, C. Haglund Stignor, A. Boss, Heat pump systems for single family and multi family nZEB, 11th IEA Heat Pump Conference. Montreal (2014)Google Scholar
- 3.C. Wemhoener, in Heat Pump Concepts for Nearly Zero-Energy Buildings: Executive Summary, IEA Heat Pump Centre, HPP-AN40-SUM (2016)Google Scholar
- 4.SVEBY Homepage, http://www.sveby.org/. Last accessed 1 Sep 2017
- 5.EN 14825:2016, Air conditioners, liquid chilling packages and heat pumps, with electrically driven compressors, for space heating and cooling—testing and rating at part load conditions and calculation of seasonal performance, CENGoogle Scholar