Numerical Simulation Of Ground Source Heat Pump Based On The Coupled Heat And Moisture Transfer

With the development of economy, the depletion rate of energy grows faster and faster,so that the world energy crisis occurs. Saving and developing energy, improving energy utilizing efficiency has become one of the biggest issues in the world. GSHP(Ground Source Heat Pump) is the example for making full use of energy. Compared with traditional air-conditioning system, It has a good energy saving and environmental benefits, and it is used widely in practice.At present, our domestic heat-transfer model research is still based on traditional line-heat source theory, and it doesn't consider the effect of groundwater seepage on heat exchanger. In order to simulate the real heat transfer condition better,this thesis has found a three-dimensional model of the ground heat exchanger,which is based on the coupled heat and moisture transfer. U-tube uses the equivalent diameter methods, and the ground-water seepage is one-dimensional flow,then use the Fluent software for the numerical solution. Found by simulation, the heat flow with ground-water seepage is significantly greater than the case without seepage,and the temperature field around of the pipe shift with the direction of water seepage.By changing a single physical parameters of soil, the influence of physical parameters of soil on ground heat exchanger performance is analyzed.This thesis founds a two-dimensional model of pipe group with the software Gambit, and uses the software Fluent for numerical calculation. The continuous heating and heat recovery characteristics of pipe group are simulated, Found by simulation, the heat transfer ability of pipe group with ground-water seepage is significantly better than the case without seepage, and the case with ground-water seepage can quickly returned to the soil initial condition when the pipe group stops running.Numerical simulation of a ground source heat pump project in JiangSu Taizhou is carried out with Fluent software, and the soil temperature distribution is also studied under different load distribution after five years of continuous operation without water seepage.