Study On Groundwater Heat Pump And Temperature Field Of Groundwater

Groundwater as a kind of sustainable environmental energy is used in the groundwater heat pump to heat and cool buildings.As the water source heat pump technology has characteristics of high stability,good heat transfer,high efficiency,economic and environmental protection,in the construction industry,more and more buildings use underground water source heat pumps as air conditioning systems,in recent years.To study the effect of water source heat pump on groundwater temperature field,this paper combines practical engineering and numerical simulation and takes study on the change of the temperature field of the underground aquifer during the working process of the water source heat pump.The double-well system is commonly used in the water source heat pump,that is,one well taking water and the other well irrigating.First,the physical model of underground aquifer is established by FLOWHEAT.The model has two layers of groundwater,separated by a water barrier.The first layer of aquifer is shallow water layer;the second layer is confined aquifer.In the single well recharge mode,the rate of groundwater temperature field change is equal on the x-axis and y-axis,and the water bodies of the different isothermal layers gradually diverge from the recharge wells form concentric circles.The thermal physical parameters of the two layers are the same,but the rate of diffusion of the cryogenic water bodies in the lower aquifer is faster than that of the upper layer.In the working mode of the double well while pumping,the isotherm of the horizontal plane is elongated in the x-axis direction.In the center of the recharge well,the distance between the two isotherms is larger than the same isotherm on the other side of the pumping well.This proves that the presence of pumping wells has had a significant effect on the subsurface temperature field.This paper puts forward the phenomenon of hot through,takes study on the influence of hydrogeological parameters on heat penetration and the condition of the occurrence of heat.Permeability has little effect on heat penetration,big porosity is less prone to heat breakthrough and the thicker aquifer layer is less prone to heat breakthrough.In the last,combined with the actual project case,introduced the specific parameters of water source heat pump system design and application.