| In response to the call of ’ carbon neutralization ’ and ’ emission peak ’,exploring clean energy heating technology innovation and reducing heating energy consumption are the current research priorities and hotspots.Solar coupled ground source heat pump technology is a new kind of clean energy heating technology that comprehensively uses solar energy and geothermal energy.The heat absorbed by the solar collectors can be stored in the soil in the non-heating season,and be extracted and transported to the building in the heating season.This technology has application and promotion value,it uses renewable energy to achieve stable operation of heating,and can effectively improve the soil heat imbalance caused by long-term operation of ground source heat pump.The paper studied the application,optimization and economic analysis of solar coupled ground source heat pump system.The specific research contents are as follows :(1)De ST software was used to simulate the energy consumption of a single-storey residential building in a rural area of Shijiazhuang,and a solar-coupled ground source heat pump heating system was designed for this building.The practical data and calculation results were used for equipment selection and construction of the system.(2)Using the udf program written by C++ language to control the solar radiation time and the inlet velocity,so as to simulate the real operating conditions of the solar coupled ground source heat pump system.The Fluent software was used to simulate the two working conditions of ground source heat pump and solar coupled ground source heat pump.The efficiency of heat exchange of two systems was compared by analyzing the temperature cloud map,temperature scatter map and the soil and outlet temperature obtained by monitoring.(3)By monitoring and gathering the actual operation data of the system,the actual operation status of the solar coupled ground source heat pump system was analyzed,and the actual operation data and simulation results were combined to analyze the shortcomings of the system and propose the optimization scheme.(4)The heat exchange effect of ground heat exchanger with or without insulation measures was simulated,and the influence of insulation layer on heat transfer performance of small-scale ground heat exchanger was analyzed.(5)A piecewise heating operation strategy was proposed,and the soil heat storage effect of the three operation schemes in the strategy was simulated by Fluent software.The optimization effect was analyzed by comparing the soil and the outlet temperature of each scheme.(6)The environmental and economic benefits of the system were analyzed to verify the applicability of solar energy coupled ground source heat pump system.The results showed that under the boundary condition of ideal condition,the soil temperature of the ground heat exchanger of solar coupled ground source heat pump system can reach nearly 80 °C after heat storage.,and the heat storage of soil can be further improved by setting insulation layer and improving operation strategy,and better heat transfer effect can be obtained.The analysis of economic and environmental benefits showed that the recovery period of solar coupled ground source heat pump system is short,the economic benefit is better than that of ground source heat pump system,and it can reduce the emission of large amounts of carbon dioxide,dust,sulfur dioxide and nitrogen oxides.The technology uses renewable energy to achieve stable operation of heating,and can effectively improve the imbalance soil heat caused by long-term operation of ground source heat pump,which has application and promotion value. |
