| In order to promote the development of green buildings and improve the existing heating structure,scientists have proposed a number of alternative air conditioning heating methods,such as solar heating,gas heating,waste heat,ground source heat pump heating.Among them,due to the attractive advantages of ground source heat pump technology,such as energy saving,environmental protection,high application efficiency and less underground space,the government strongly supports the use of groundwater source heat pump as the heating method for buildings,but because of its development time in China.It is relatively short,and the relevant specifications and standards are lacking.The research on the variation law of the seepage field,temperature field and stress field in the aquifer under the influence of the operation of the heat pump system is insufficient,and the environmental problems caused by the unreasonable design are gradually emerging.Based on the research results of ground source heat pump system at home and abroad,the coupling mechanism of the seepage field,temperature field and stress field of underground aquifer under the influence of ground source heat pump system is analyzed in detail,and the underground aquifer heat is established.Solid-flow coupled mathematical model,using COMSOL Multiphysics multiphysics simulation software to establish a physical model for the ground source heat pump system applied in the Baikanting Xingangyuan Community in Wuhan,simulating the effects of different recharges on the temperature field and stress field.The design of the pumping design of the heat pump system in the district is proposed.By comparing the simulation data with the on-site monitoring data,the authenticity of the model is verified.The main conclusions of the simulation are:1)The aquifer rock soil temperature is affected by the recirculation water and the extent of the system becomes larger as the system operation time increases.At the same time,the temperature influence radius is also affected by the movement of the groundwater flow.The high temperature area is placed at the level of the pumping well as the apex of the "drop shape";the greater the amount of recharge,the earlier the heat breakthrough will occur;2)The pumping process will cause the water pressure in the aquifer to be redistributed,the pore water pressure in the pumping well will decrease,and the groundwater pressure in the recharge well will increase.The water pressure value of the pumping well is also affected by the amount of recharge.When the amount of pumping is constant,as the amount of recharge increases,the water pressure near the well is disturbed,and the area far from the well is basically unaffected.When the pumping amount is the same,the water pressure in the pumping well is "symmetric";3)Under different recharge rates,the stratum settlement on the pumping well side of the same depth is greater than that of the recharge well side,and the deformation on the left side of the recharge well is the smallest,and the deformation on the right side of the pumping well is the largest;The increase of the formation is less and less compacted by the influence of pumping water.At the surface,the deformation on the right side is larger than that on the left side.The higher the recharge rate,the smaller the impact of system pumping on the formation.Therefore,it is recommended to increase the recharge rate and reduce the formation settlement as much as possible within the conditions allowed;4)Comparing the simulation data and field monitoring data of ground temperature changes under different working conditions,it is found that the maximum relative error of both is within the allowable range,indicating that the established physical model agrees well with the actual measured values and can be used to guide Engineering practice.Figure[37]table[4]reference[73]... |
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