Research Of Usaturated Zone’s Termal Characteristic In The Water Source Heat Pump Engineering

Underground water source heat pump system is can be used to heat and refrigerated with efficient energy-saving air conditioning system use shallow ground energy and it has be used more and more widely in the global scope. unluckly,beause of the heat pump technology is not mature, which has caused a series of problems like injection difficult,heat breakthrough and environmental pollution and so on,they offen appeared during underground water source heat pump engineering operation process.The Underground water source heat pump’s injecting process in vadose zone has a considerable infiltration capacity, so it is very important to study unsaturated zone field’s change characteristics of water level and temperature during underground water source heat pump engineering operation process. Now, we make shenyang city as an example to study heat pump operation thermal characteristics, just for grasping the change characteristics of water level and temperature to improve the underground water source heat pump engineering’s efficiency.First, the paper collect the hydrogeological conditions in shenyang city, to determine lithologic characteristics in different areas and the sand characteristics in different areas, based on the sand characteristics, the author collectsabout13underground water source heat pump engineerings’ temperature with different time and depth in2011.then the author analysed water temperature and rate of recovery of the monitoring in different times and depth, to study the change characteristics of water level and temperature, the research shows that the temperature decreases with formation depth’s increase, the temperature range in25m-35m depth is stable, known as the constant temperature zone.According to the temperature collected in Shenyang city to draw the temperature partition map, to make a basis for testting sample and setting up models.For the research of sand thermal characteristics in recharge process, the author take indoor test method to measured the thermal properties and mechanical dispersion characteristics with different sand.The study of Sandy soil thermal characteristics the author applied thermal probe method, measured under the condition of different moisture content of soil thermal conductivity, the results shows that Thermal conductivity increased with the increase of moisture content, when the moisture content is greater than15%the sandy soil coefficient of thermal conductivity was basically in a stable state, so the sandy soil coefficient of thermal conductivity has a little influence to transport materials.For the acquisition of different recharge condition heat dispersion degree change characteristics.by establishing the horizontal soil column model and using the application of one dimensional unsaturated soil heat transport equation set, the author measured the transport materials of coarse sand, medium sand and fine sand with different recharge temperature to analyze its chatacteristics.The results shows that with the same recharge temperature conditions, medium sand thermal dispersion degree is the largest, coarse sand is the second smallest, and fine sand minimum; for the same type sand, different recharge water temperature heat dispersion degree along with the temperature rising; during the heat pump engineering well spacing process should be accurately grasps the heat dispersion degree change characteristic, optimize the well spacing to improve the efficiency of heat pump.Secondly, in order to validate the feasibility and accuracy of the test, the author select two heat pump engineering named Xinmiao hotel and Hongtian meilin to compare and analyze the simulated value of monitoring numerical and experimental data.by analyzing test data, the difference between the under the condition of numerical simulation and the actual engineering monitoring value is small, shows that the test data error is small and the test data is accurate and reliable.Finally, in order to improve the use of practical, after the test’s completion.the author take Qianyuan project and Letian project as a example.Compare the sand lithologic area chart and geothermal area chart in Shenyang city, select the corresponding heat dispersion degree test numerical, use the software named Fellow to simulate the two projects" temperature characteristics, make some analysis of the actual projects’feasibility and reliability and propose some forward reasonable well spacing scheme.