Experimental Analysis And Simulation Of Soil Temperature Field Around Heat Exchanger In Hefei Region

Due to the severe shortages of the world's fossil energy and the imminent exhaustion of the situation,the sustainable development strategy came into being.Shallow geothermal energy is widely used as a renewable energy source,ground source heat pump developed rapidly as a result of energy efficient,clean and environmentally friendly and the advantages of a multi-purpose machine.This paper first introduces the composition,working principle,influencing factors and the advantages and disadvantages compared to traditional air conditioning energy consumption.Contact with the actual climate characteristics,analysis of its suitability in Hefei area implementation.Then,the thermal properties and the thermal conductivity of the soil around the buried pipe were introduced,several typical internal and external heat transfer models of buried pipe were analyzed and the accurate heat transfer model for this experiment was obtained by the comparative analysis.Secondly,select an office building in Hefei,in two typical seasonal climate conditions and the unit operates in two different modes,intermittently and continuously.By analyzing the measured data to determine the unit under what conditions can help to improve the running performance and restore the soil temperature field inside and outside of the borehole.Finally,in order to verify the accuracy of the measured data and the conclusions drawn from the analysis data,this paper simulates the influencing factors of the temperature field around the buried pipe by ANSYS simulation software.The influencing factors include soil thermal conductivity,drilling depth,pipe diameter and heat flux density.The favorable factors conducive to the surrounding temperature field of the drilling are analyzed by simulation.Then the distribution of the temperature field under different operating conditions and the situation after the operation of the unit are simulated for several years,and the distribution of the underground temperature field after the ground source heat pump operation in Hefei is analyzed.