The project examined possibilities to increase the efficiency of combined systems comprising hybrid collectors and heat pump installations. Since the electricity yield of PV-modules increases when the cell temperature decreases the hybrid collectors of PV modules are cooled using heat pumps. Due to the low temperature range this waste heat cannot be used for warm water treatment is. Thus, new usage scenarios have been analyzed for heat pump systems.

For example, tests were carried out that aimed at increasing the heat pumps’ condensation temperature with waste heat in an effort to increase its year-work-unit. Special attention was paid to the active use of ground collectors as heat storage units for the load distribution between waste heat availability and demand. Various control-oriented and hydraulic concepts were developed; their overall energy efficiency was verified through dynamic facility and building simulations.