Analysis Of The Influence Of Underground Water Heat Pump Well Group Arrangement On The Flow Field And Temperature Field

In the course of running of underground water heat pump,the groundwater seepage field is affected by the well spacing,thermal convection,layout pattern,hydraulic slope and others,groundwater seepage field and temperature field will alter,in serious it would cause "heat penetrating" phenomenon,leading to the inefficient operation of underground water heat pump system[1].Due to the hydraulic slope,pumping well spacing and layout mode have a direct effect on heat penetrating of underground water heat pump system[2].Therefore,this study mainly studied the influence of the three factors on the underground flow field and temperature field.In this article,we take a residence community in Xitie District,Shenyang,as an example,as the residence community usually needs heating in winter,but not in the other three seasons,so the influence on the change of groundwater flow field and temperature field is more obvious.We based on the theory of thermal transportation,to establish a three-dimensional numerical model.Numerical simulation is done through software Flow Heat1.0 to analyze the effect of pumping well spacing,arrangement mode and hydraulic gradient on the underground temperature field and flow field around pumping wells,preventing the occurrence of heat transfixion phenomenon,to provide reliable theoretical basis for improving the system operating efficiency.At first,this article did not take the natural hydraulic gradient of groundwater in to consideration,using software Flow Heat1.0 to do research on the underground temperature field and flow field around pumping Wells,with different well spacing,of the Tiexi District,Shenyang in winter.The result shows that with longer well spacing,the time of heat transfixion is longer,and the degree is lighter.Then,in view of the pumping well spacing is of 30m,40m and 50m,respectively,to do the research on the effect of the three arrangement modes to the underground temperature field and flow field around pumping Wells.The results show that the arrangement mode of inserting row is the optimal layout scheme for the pumping well group of underground water source heat pump air conditioning system.After that,when the pumping well spacing is 30 m and the arrangement mode is inserting row,do research on the effect of four different hydraulic gradients of 1‰?2‰?3‰?4‰,respectively to the underground temperature field and flow field.The result shows that the bigger hydraulic slope is,the smaller impact of injection well is.With higher temperature of injection well,it will be better for pumping.At last,with the injection well of 40m or 50m,it researches the impact of hydraulic slope on injection well.The result shows that the bigger of injection well is,the stronger impact of injection well on underground temperature field,and the bigger change value of pumping temperature is.