Matuska, Tomas; Sourek, Borivoj; Broum, Michal - In: Energy Reports 6 (2020) 3, pp. 117-123
. Energy system consists of innovative heat pump (5.5 kW) extracting the heat from two environments: ground and ambient air …. Heat pump is coupled with simple seasonal ground storage of heat built under the house and with photovoltaic system (6 kW …) installed on the roof. In case of excess photovoltaic (PV) electricity in summer, the heat pump with variable speed compressor …