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absorber absorption heat pump air temperature APELDOORN average boiler building Building Research Establishment calculated coefficient compressor condenser construction cost demonstration district heating domestic hot water economic efficiency electricity energy conservation energy consumption energy saving engine equipment evaporator experimental Figure film flow rate fluid foam fuel glazing heat demand heat exchanger heat loss heat pump system heat source heat store heating season heating system improved installation insulation internal combustion engine lighting load low energy measured mechanical ventilation meter mineral wool monitoring obtained operation output paraffin parameters performance period plant possible pressure programme prototype radiation reduced refrigerant roof sensors shutters simulation solar solution space heating storage supply surface techniques temperature test house thermal comfort thermal conductivity thermal insulation tubes U-value valve ventilation walls window zone