PERFORMANCE AND ECONOMY ANALYSIS OF A SOLAR ASSISTED CO_2 GROUND SOURCE HEAT PUMP WITH AIR-COOLED GAS COOLER UNDER DIFFERENT CLIMATE CONDITIONS

摘要

In this paper a solar assisted ground source heat pump with air-cooled gas cooler system usingrncarbon dioxide as working fluid was designed to solve the operating problem that traditional ground sourcernheat pump has. This novel system contains a solar energy collecting system and a carbon dioxide gas coolerrnsystem along with the traditional ground source heat pump using carbon dioxide as the working fluid. Byrnusing the carbon dioxide gas cooler, the model can immensely improve the situation of thermal unbalance inrnsoil for regions where cooling load is higher than heating load. By using the solar collector to compensate thernheat supply to mitigate the thermal unbalance in soil for regions where heating load is higher than coolingrnload. A numerical model for this system was developed based on TRNSYS. The simulation results on thernnovel system have shown that the thermal unbalance in soil can be lower than 0.1% by using this novelrnsystem. The performance of the proposed system in different regions was analyzed and compared withrntraditional ground source heat pump systems.