Solar heating and nocturnal cooling system integrated in refurbished buildings

Green energy system for the old building retrofitting for energy efficiency upgrade was proposed in this paper, which was composed by solar radiant panels, energy storage, multi-source heat pump and low temperature difference energy supplier. This building energy system can make efficient use of solar energy, sky radiation and natural energy, through the radiant panel installed as the building envelop or on the roof. Two types of the proposed energy system were applied for building refurbishing and their performances were comprehensively studied. It is shown that the building energy consumption annually is less than 30kWh/m(2) and the indoor temperature is over 18 degrees C in winter and under 26 degrees C in summer, fully meeting the comfort temperature requirements.