The Study Of Of Numeric Simulation Of Temperature Field Of U-vertical Buried Pipe Of GSHP

At present, due to its high efficiency and energy saving, Ground Source Heat Pump (GSHP) is gradually recognized by people. Wuhan is the typical area which has the climate of cold winter and hot summer. As a result of the bad climate and the condition of building heat environment, the refrigerating and heating source which is energy saving, clean and steadily running is strongly needed to solve the refrigeration and heating in this area. So the GSHP is very suitable for the climate which is hot in summer, cold in winter and the requirement of energy-saving according to its systematic characteristic.Combining with the former study, the subject has done the following work: Comparing the several usual ways of burying tube in GSHP system, vertical buried-pipe system has better development prospect than horizontal buried-coil, because of taking less space and having higher heat transfer efficiency.A transient heat transfer model of the soil temperature field around a vertical U-tube of ground source heat pump was established. The numerical simulation was obtained by using MATLAB software .By making the simulation of cooling mode in summer, the change rules of the soil temperature with the radial direction, the change rules of the outlet water temperature of the buried pipe and the thermal influencing radius in the vertical multi-pipe were obtained.When the GSHP has run consistently for a long time, the heat transfer efficiency could be different from the previous design. Some measure should be made to guarantee the high heat transfer efficiency when it has ran consistently for a long time, such as choosing the distance between buried-pipe and the depth of well, selecting the backfilled materials. So the outlet water temperature can be got by numeric simulation when it has ran consistently for a long time, also the operating condition could be changed to reach the best running effect. As the numeric simulation method has been proved right, it can be applied widely to confirm the extent of the buried-pipe outlet water temperature influenced by different circulate water storm and depth of well and different thermal conductivity of soil and rock around the buried-pipe and to analyze the influence of underground heat-exchanger's heat transfer by different back-filled materials and different operation ways and different distances between the buried-pipes. It can offer reference of GSHP system running high effectively in a long time.