24 June 2014
Solar and heat pump heating systems have been simulated and analyzed by
experts from different countries in Subtask C of the IEA SHC Task 44 / HPP Annex 38 “Solar and Heat Pump Systems” from 2010 to 2014. A summary of these simulation results is
presented, compared and analyzed in this work, comprising systems where solar collectors provide heat in parallel to a heat pump, systems where solar heat is also or exclusively used
for the evaporator of the heat pump, systems with ice storages, and systems with active solar regeneration of the ground source of the heat pump. Results show that the increase in
overall system seasonal performance factor and electricity savings achieved by using solar thermal heat in combination with a heat pump depends to a large extent on the system
concept, on the climate, and on the heat load that is to be served. For many system concepts small details are decisive for the system performance, among these are e.g. hydraulics and control of the heat pump integration into systems with combi-stores.