The Study On The Influence Of The Water Migration On The Heat And Moisture Transfer In Soil

In the past 10 years, ground source heat pump technology which is used of geothermal energy, has been rapid development and promotion. Ground source heat pump system can be used for heating, cooling and hot water heating, with high efficiency and environmental friendly. The geographical position is one of the important factors to limit the application of ground source heat pump system. Because of the different demand of load between the summer and winter, the cold / heat accumulation would be easy to caused. The changes of soil temperature is the important reason for the performance of the soil source heat pump system Through the combination of the seasonal heat storage device and ground source heat pump system decreased. Combining ground source heat pump system with the seasonal heat storage device, which can solve the problem of soil storage/exothermic imbalanced. To maintain the pump system operation in high efficiency.Through the experiment,by testing the change of soil temperature and moisture content, which is in the process of heating storage of soil, aimed to find the Characteristic of the heat and moisture transfer of the soil. The analysis of the experimental data obtained:(1) In the heat storage process, because the heat and moisture transfer, the interaction between temperature field and humidity field of soil exists.(2)Under the condit ion of the same initial soil VWC, the higher temperature, the temperature gradient in the soil is higher, the greater the impact of temperature field.(3) In the process of soil heat storage in high storage, moisture migration in soil is more obvious and the range of soil humidity and heat storage capacity was decided by soil type. Compared with the soil, because of the characteristics of sand, water has faster transmission. Under the same initial soil VWC and temperature of heat source, he at capacity soil medium. The effect of heat source temperature and initial soil volumetric water content(VWC) on soil temperature and VWC distribution was analyzed and the characteristics of soil heat and moisture transfer and moisture immigration was dis cussed as well.The numerical model of one-dimensional heat and moisture transfer in soil heat charging at high temperature was established. Finite Volume Method was used to deal with the model and the Matlab software was used as well for programming and solving the model. The soil heat storage process, the peak of soil moisture exists. The moving speed of the moisture content of the peak decreases with increasing storage time will increase the peak position of the moisture stabilit y of distance of about 0. 75 m. The heat source(50 C and 80 c) effect on the range of soil moisture field is about 2.1m, the influence on the soil temperature field is about 1.2m. Keywords: Soil source heat pump, Cold/Heat accumulation, Heat and moisture transfer,...