Study On Energy Consumption Of Solar Ground Source Heat Pump System And Analysis Of Influencing Factors

For a long time,coal-fired heating has been the main method of heating in winter in northern China.Not only does it lead to huge consumption of primary energy,but it also causes an increasingly serious environmental pollution problem.The solar ground source heat pump system uses a new type of clean energy as a heat and cold source,which is both energy-saving and environmental protection.It is of great practical significance to study the application technology of solar ground source heat pump in severe cold area.The application of solar ground source heat pump(GSHP)hybrid system in Daqing area is studied systematically by numerical simulation and experimental method.Main research contents and achievements:(1)Theoretical analysis of solar ground source heat pump system.This paper describes the working principle,advantages and evaluation index of the solar ground source heat pump system,and introduces the research status of the solar ground source heat pump system at home and abroad;(2)Analysis of soil temperature field variation law.The soil temperature field,system COP and system energy consumption of ground-source heat pump(GSHP)system with different buried pipe spacing and different buried pipe depths were simulated and analyzed by using TRNSYS software.The simulation results show that when the GSHP system is running in winter and summer,the buried pipe spacing is 6m and the buried depth is 150m,it is suitable for Daqing area;(3)Performance optimization of composite system.Using TRNSYS software,the solar energy ground source heat pump system is optimized from solar collector area,model,inlet temperature,inlet flow rate,Azimuth angle and obliquity.The results show that,when the distance of buried pipes is 6m,the depth of buried pipes is 150m,the vacuum tube collector is selected,the inlet water temperature of collector is 50°C,the inlet flow rate of collector is0.6m ~3/h,azimuth angle is 0,inclination angle is 45,the energy consumption of the unit is the smallest;(4)Seasonal variation characteristics of composite system performance.The variation of COP in different seasons is analyzed by using the existing experimental platform of solar ground source heat pump system,and the variation of heat supply,energy consumption and soil temperature field in each season is mainly studied,the origin software is used to fit the relationship between COP and solar radiation of the solar ground source heat pump unit is fitted;(5)Analysis of energy consumption of hybrid system in different seasons.The operation time,energy consumption and COP of the solar ground source heat pump system in different seasons are simulated and analyzed by using TRNSYS software,fitting the relation between energy consumption and area with origin software.