Optimal Operation Strategy Of Coupled Energy Supply For Ground Source Heat Pump

The ground source heat pump system uses the shallow geothermal energy of the ground surface as the low-level heat source.The system meets the needs of heating in winter and cooling in summer for different functional rooms in the buildings through the collection,compression and release of the geothermal energy.However,a single ground source heat pump system(GSHP)can not balance the heat and cold in the ground source field.Therefore,it is necessary to cooperate with different forms of cold and heat source system coupling operation.By using DeST software,it simulates the conditions of heating in winter and cooling in summer according to the climate and architectural characteristics in Beijing.According to the simulation results,different types of cold and heat source devices are selected for comparison.The daily energy usage data of 100%,75%,50% and 25% of cold and hot load were calculated respectively.Moreover,the optimal operation model of multi-objective theory is established to analyze the three sub-objective function models of minimum primary energy consumption,minimum carbon dioxide emission and minimum annual total investment in the operation of the coupled system of ground source heat pump.Through data comparison and analysis,the energy consumption of the ground source heat pump coupled cooling unit is the lowest.Carbon dioxide emission under the system is calculated at the same time.Considering the initial investment,operating cost and economic benefits of the system,it is concluded that the operation strategy of the coupled ground source heat pump cooling unit is the optimal one.Through a large number of detailed operation test data,this paper has recorded the system's annual operation status,which can provide a reference for the application of ground source heat pump system in Beijing.It is also beneficial to the promotion and application of ground source heat pump in north China.