18 May 2017
Future heat generation systems require renewable and sustainable energy supply. Therein, heat pumps play a favourable role due to the ability to use renewable electricity efficiently and flexibly and to integrate fluctuating renewable heat sources or waste heat.
A heat source with a rather constant temperature level and hence interesting heat source during winter time is the ground, but heat transfer rates are limited. The most flexible heat source is the outside air, which is also the closed heat loop partner for the heat losses of buildings. In the focus of the paper are future heat pump systems that are able to integrate different heat sources flexibly and still efficiently.
Results from the SOFOWA project showed key facts for the integration of convective heat sources, solar heat, ground heat gains and ice storages connected via brine circuit. A project about the application of city-compliant air-source heat pumps for the replacement of fossil boilers in existing residential buildings shows potential application of brine/water heat pumps with mainly air as heat source. The results are summarised and interpreted from the point of view of using manifold heat sources for brine/water heat pumps.