PV Driven Air Heat Pump Using Overheating Effects as Thermal Battery in Single Family Houses
Abstract
Theoretical investigations based on TRNSYS simulations are carried out for an electric driven air heat pump (AHP) in combination with different concepts for thermal activation of the building mass (TABS) and water storage (TES) in small single family buildings. TABS and TES are acting as thermal battery for local produced photovoltaic electricity. Several different heat pump characteristics and control strategies in combination with different building types (refurbished low energy house or passive house) and heat capacities (concrete or wood frame structure and water storage volumes) are investigated. Using PV with 7362 kWh gain per year the household grid electricity of 3058 kWh/a can be reduced by 35% and AHP grid electricity of 3175 kWh/a can be reduced by 15% without any thermal activation but up to 56% using building mass and water storage as thermal battery for the PV system.