The Optimization And Energy Supply Strategy Research On The Gas Engine Driven Heat Pump With Energy Storage System

China’s building energy consumption accounts for more than 35% of the total energy consumption of the whole society.The proportion of air conditioning and heating energy consumption in the total energy consumption of buildings is increasing year by year.Gas-engine driven heat pump(GEHP)system is an efficient air conditioning system,which can not only use natural gas as energy source,but also recover waste heat from the flue gas of gas engine.The main contents of this paper are as follows:Firstly,the calculation models of the variable capacity regulation of ESGEHP system,coupling among components and real-time load demand of the buildings are established.Taking gas engine speed,self-contained electricity,storage tank volume and COP as decision variables,combined with the calculation model of the real-time cooling,heating and hot water load of the typical days,based on particle swarm optimization(APSO)algorithm,the matching relationship of the ESGEHP system and the real-time load of the buildings is obtained.A new operation mode of ESGEHP system is developed,which is low load mode(Mode L),partial load mode(Mode P),full load mode(Mode F)and overload mode(Mode O),to realize efficient energy storage and release of ESGEHP system in the process of cooling and heating.In the case of extreme weather or increasing demand for heating(such as changing conference rooms into offices),the ESGEHP system only needs to increase small heat generation and combined waste heat recovery to meet the increasing demand for building load,for the combination of the energy storage system to the GEHP system.The simulation results were well agreed with experimental data,the average difference is 8.9%,9.63% and 21.7% for the annual primary energy ratio of heating,cooling,transitional season,respectively.Secondly,in order to improve the applicability and operational efficiency of ESGEHP system when supply heating and cooling to different types of buildings,the energy supply characteristics of ESGEHP system and the variation of the building cold and heat load under typical weather conditions were explored.Based on the operation strategy of ESGEHP system,the real-time cooling and heating load characteristics of buildings on typical summer days(17/07/2016)and winter days(07/01/2017)are selected as the research objects.The specific operation mode of ESGEHP system for cooling and heating of four functional buildings in the typical days were obtained,combing the optimal value of decision variables of ESGEHP system.The results show that the primary energy utilization of ESGEHP system is feasible,and the primary energy ratio of the gas engine driven heat pump with energy storage system is about 21.4%(residential building),35.2%(hotel building),23%(office building)and 26.6%(university building)higher than traditional GEHP.The simulation and experiments were carried out to study the performance of the system,including the performance of the PV/T system,the real-time heat load demand of the building and the environment parameters.The research results showed that the average COP and PER of the SESGEHPs were nearly 24.5% and 20.4% higher than the ESGEHPs,respectively.The fuel-consumption and the average compressor power consumption of SESGEHP system were nearly 7.5% and 24.0% lower than the ESGEHP system,respectively.Finally,the experimental data are processed using the generalized regression neural network(GRNN)to get the relationship between the independent variable(solar radiation,outdoor dry bulb temperature and wind speed)and dependent variable(the building heating load,heating capacity of the SESGEHPs,heat-obtained quantity and power generation of the PV/T system).