T Preliminary Study On Indoor Sand Tank Test Of Groundwater Source Heat Pump In Xi’an

Groundwater heat pump is a clean and pollution-free,recyclable heating and cooling methods,belonging to the scope of new energy.However,due to the complexity of the groundwater heat pump system and the large regional differences and other factors,the regional management regulations and design specifications are imperfect,groundwater heat pump pumping well layout,recharge water temperature control and other parameters are mostly determined by virtue of experience Lack of corresponding scientific guidance,so some of the groundwater heat pump system has been put into use during the operation of the irrigation wells exposed between the " heat transfixion",ground subsidence and many other environmental and safety related issues.In order to further improve the design of underground water heat pump pumping well group,provide a scientific reference for the development and utilization of underground heat pump in Xi’an.Based on the basic theory of physical sand tank,this paper designs the indoor physical sand tank model,simulates the underground water source heat pump in the actual operation process,and monitors the temperature through sensor and pressure monitoring.The process of change inside the sand tank.The method of hydrogeochemical,Aqua Chem,PHREEQC and other software was used to simulate the simulated pumping process.The reasonable distance between the pumping wells was analyzed by the software of the water heat pump system.Between the building and the pumping well And the relationship between the seepage field,the temperature field,the chemical field and the stress field during the sand tank test.The results show that the pumping well spacing,pumping flow,irrigation ratio and pumping capacity of 0.16 m3/h and 1: 2 irrigation in the actual operation of the groundwater heat pump of Fenglinging Jiuxi are reasonable The distance between the wells is 30 cm,and the feasibility and reliability of the sand tank model test are verified.Groundwater heat pump pumping wells between the reasonable well spacing,the distance between the building and pumping wells with the pumping distance,pumping ratio,pumping wells between the layout,hydrogeological parameters,overlying load and other parameters of the Change and change.Under the conditions of "linear ipsilateral composition " and "fan-shaped composition ",the hot penetration phenomenon is more significant than that in the "linear dissimilar layout" and "triangular layout" conditions.Under the same conditions,"straight-line layout" and "fan-shaped layout" Than the "straight line layout" and "triangular layout" more prone to thermal breakthrough.By the influence of temperature and the material of the irrigation system,the influence of the water rock reaction will occur.A series of chemical reactions will lead to the precipitation and dissolution of some substances during the pumping process.In general,the amount of precipitation is larger than the dissolved amount during the temperature change.During the operation of the groundwater source heat pump,the water and rock action of the aqueous medium will be further strengthened with the alternation of the cycle and the temperature of the running cycle,and the sediments which are damaged by the underground water source heat pump are accumulated.