Investigation on the layout and parameter sensitivity for the pumping-recharging wells of water source heat pump of the abandoned mines
The abandoned mines contains abundant geothermal resources.This article takes the mine water of gob area as the research object;in order to ensure the stability of pumping temperature during the heating season,the layout and parameter sensitivity of pumping-recharging wells of water source heat pump of abandoned mine are studied.Firstly,based on the Darcy's law and the theory of heat transfer in porous media,the two-dimensional numerical calculation models of the coupled multi-physical fields of the pumping-recharged well are established.Secondly,the pumping water's temperature variation of 14 arrangement forms of pumping-recharging wells are analyzed while the theoretical models are employed.The most reasonable arrangement form can be selected according to the degree of the heat transfixion.Finally,when the selected pumping-recharging wells'arrangement form is taken into consideration,the effects of different factors including the recharge temperature,the pumping-recharging water's flow rate,the wells'spacing,the hydraulic slope,the aquifer thickness and the porosity on the pumping temperature are discussed.The results of the analysis show that the well placement method of triangle 4 only decreases the pumping temperature by 0.148 K at the end of the system operation,and the occurrence of"thermal penetration"is the least and the well placement method is the most reasonable.The occurrence of"heat transfixion"in the aquifer is more sensitive to parameters such as pumping flow rate,well spacing,hydraulic gradient,and aquifer thickness,while it is less sensitive to recharge temperature and porosity.
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