Comparison of Solar Systems with Seasonal Storage for Renewable Heat Production for District Heating
Abstract
The use of solar energy for renewable heat production for supply to a low-temperature district heating system is compared for two solar system concepts: solar thermal system with photothermal collectors and system combining photovoltaic modules and air source heat pumps. Both systems are operated with identical seasonal heat storage within the borehole field. Renewable heat production and efficiency of seasonal heat storage are compared. The analysis shows that for the same area of collectors a system based on heat pumps powered only by electricity from photovoltaics has about 10 to 20 % higher production and supply of heat than solar thermal system depending on sizing.