16 September 2011

EXPERIMENTAL AND SIMULATION RESULTS ON A SOLAR-ASSISTED HEAT PUMP PROTOTYPE FOR DECENTRAL APPLICATIONS


The combination of heat pumps and solar thermal collectors is widely regarded as a promising concept to provide low-exergetic space heating to buildings. Apart from being solar-thermally assisted, the heat pump system presented in this paper is characterised by its decentral application as well as its façade integration. Because of the decentral heating of only one room, the designed power of the heat pump is just about 1 kW. Façade integration means that both the heat pump and its solar source – a plastered absorber – are included in an exterior wall. The heat pump built for this system and the solar absorber are examined as single
components at test facilities. Afterwards, the parameters are used for dynamic systems simulations in IDA Indoor Climate and Energy. The results are presented on annual basis
and in detailed analysis. Here, the focus lies on the interaction of heat pump and solar collector. It is demonstrated how the solar collector can boost the heat pump considerably,
resulting in higher system efficiency. To examine potential improvements to the systems, further simulations are carried out and presented comparatively.