Operation Evaluation of Solar Energy and Ground Source Heat Pump Combined Heating System Based on TRNSYS Simulation

To alleviate the problem of generally high heating energy consumption in hot-summer and cold-winter areas, a solar heat production-assisted ground source heat pump system is used for combined heating. Taking a building in Hefei as the heating object, a building load calculation model was built using TRNSYS software, and the supply and return water temperature, unit operation partial load rate (PLR), heating performance coefficient (COP) and operation energy consumption were used as evaluation indexes to compare and analyze the heating operation of traditional ground source heat pump system, solar collector and heat pump unit in series and parallel system. The results show that the heating temperature of the three systems can meet the demand during the heating season. Compared with the traditional ground source heat pump heating system, the COPs of the solar collector and heat pump unit in series and parallel heating systems increase by 48.61% and 8.33% respectively, and the energy consumptions decrease by 84.02% and 75.26% respectively, and the PLR of unit operation are significantly reduced. The composite heating system, especially the system connected in series, has obvious energy-saving advantages.