According to the load characteristics of different building types in typical climate zones （Zhengzhou and Harbin）, a multi-energy sequential complementary central heating system was proposed, and the storage and extraction law of heat storage field was simulated and analyzed. Through Trnsys simulation, the average soil temperature of heat storage field, system operation strategy and energy efficiency improvement rate of multi-energy sequential complementary central heating system in different buildings were analyzed. The results showed that the average soil temperature was in dynamic equilibrium, and the highest average soil temperature was 65 ℃ in the public system. The operation strategy of the residential construction system in public buildings and cold areas takes solar direct supply and thermal storage field direct supply as the main heating mode, supplemented by ground source heat pump. The operation strategy of residential construction system in cold areas takes ground source heat pump as the main heating mode, and solar direct supply and thermal storage field direct supply as the auxiliary. Compared with the ground source heat pump system, the energy efficiency of the multi-energy sequential complementary central heating system is significantly improved. The energy efficiency of the public construction system can be increased by more than 90%, and the energy efficiency of the residential construction system in the cold area is increased by 59.12%.
Key words
solar energy /
ground source heat pump /
TRNSYS simulation /
COP /
soil heat storage
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