Close to 100 % Renewable Energy Single Family House in Heating Dominated Climates
Abstract
With the goal to reduce the grid electricity demand of new single-family and terraced houses close to zero, an innovative heat supply system based on renewable energy (i.e., PV), heat pumps (HP) and industrialized building-scale long-term thermal energy storage (TES) is investigated by means of a simulation study. The large tank TES is charged using excess PV in summer and supplies heat in winter. The implementation of a booster HP allows to reduce the TES size. The detailed simulation study of the concept shows that in the climate of Rostock (Germany) with a 14 kWp PV system and a 10 kWh battery the grid electricity demand for appliances and auxiliaries can be reduced from 28 kWh/(m² a) to 5.5 kWh/(m² a). With the TES with a volume of 48 m³ the grid electricity for DHW and SH can be reduced from 11.5 kWh/(m² a) to 2 kWh/(m² a).
Keywords
nearly zero energy building, efficiency, heat pump, thermal energy storage, photovoltaic, P2H