Study On Operation Strategy Of Hybrid Ground Source Heat Pump System Based On An Energy Station Project

With the rapid development of economy,energy consumption is increasing and the ecological environment is deteriorating too.It has been an important content of social sustainable development to reduce the energy consumption in the process of building use and make efficient use of energy.In recent years,ground source heat pump has been widely studied and used at home and abroad due to its advantage of energy saving,high efficiency and environment protection.However,due to the influence of geological condition,environment climate and some other factors,system performance will go worse with running time increases when using traditional ground source heat pump.Therefore,it is necessary to adjust the system according to the local conditions and combine GSHP with other technologies to meet system requirements.This paper takes the centralized energy station of a bureau in Hubei province as an example,calculates the annual hourly load by using DeST,and then design a hybrid system of ground source heat pump and water chiller based on the load characteristics.A simulation model of forbid GSHP system is built in TRNSYS.According to the different operation sequence,number of units and wet bulb temperature control standards of ground source heat pump and chiller,five different control strategies are developed.Through running simulation of the system for ten years,the operating conditions of the unit and the system under various strategies are obtained.By comparing the soil temperature change,water temperature at the inlet and outlet of the buried pipe,energy consumption and performance coefficient of the system under different strategies,it is concluded that the combination of unit capacity and wet bulb temperature control is the optimal operation strategy.The research approach and results of this paper can serve as a reference for the selection of air-conditioning system forms and operation strategies in other engineering projects,so as to ensure the energy saving and the stable and efficient operation of the system in the long term.