Research Of Ground-Source Heat Pump System Compensated By Solar Energy

The heat load needed for heating in Hanzhong area is larger than that required for cooling in summer,which results in imbalance of heat and cold load.If ground-source heat pumps are used for heating and cooling in the area,years of operation will result in lower ground temperatures around the area.In the long run,the efficiency of the whole system will be reduced,and the soil thermal imbalance will be caused and the ecological balance will be destroyed.In order to solve this serious problem effectively,we consider using solar energy system to compensate ground-source heat pump in this area,and combining solar energy with ground-source heat pump to operate.After the system was cooled in summer,the solar hot water system was used to replenish the soil heat to restore the soil temperature to the initial state so that maintain the soil heat balance.On the basis of previous studies,a solar-powered compensated ground-source heat pump system is proposed in this paper.The system includes solar energy collection system,underground pipe heat transfer system and heat pump system.There are two design patterns in this project,one of them: the ground-source heat pump system is combined with the solar energy heat pump system in winter,and the ground-source heat pump system is used in summer;The other one,the ground source heat pump system is used alone in winter,,the ground source heat pump system is used in the cooling season of summer,and the solar energy system is used to supplement the heat to the soil on september and october.The research object of this subject is a two-story office building in Hantai district of Hanzhong.The building was simulated with TRNSYS software,the solar compensated ground source heat pump system model was established,and the dynamic simulation of the system was carried out for 10 years.Based on the simulated data,the variation of ground temperature,heat pump efficiency and energy consumption were analyzed,and the feasibility of the system was demonstrated.Finally,By comparing the initial investment and operation cost of the system with the traditional boiler heating,air conditioning and fan refrigeration system,it was found that the system not only has good economic benefits,but also saves energy and environmental protection.This paper provides the basis for the feasibility of the system in this area,and lays a foundation for the practical application of the system.