Soil Temperature Monitoring and Study on Geothermal Heat Pump Systems

Abstract

Soil temperature monitoring and study on geothermal heat pump systems Shenyang is one of the cities which geothermal heat pump systems are widely used in China. More then 400 systems are in use and most of them are groundwater heat pump systems. In order to study temperature changes in different direction and the influence of pumping rate, we select two groundwater heat pump systems. Pumping rate, injection rate, soil temperature are monitored in the systems. One of the systems selected is a hospital. Heating and cooling area is about 46000m2. There are 4 Pumping wells in the west side and 8 injection wells in the east side of the hospital. Distance between Pumping wells and injection wells is 80m. 3 bore holesi50 meters deepj are constructed between pumping wells and injection wells. And in each bore hole, 10 temperature-measure detectors are put in different depth. During the time that pumping systems are operation, temperature is measured once a day. Temperature monitoring lasted more then two years. By analyse the aquifer information, pumping rate and temperature curve, we discuss some questions such as temperature transfer in different aquifer(soil) in geothermal heat pump system, and reasonable distance between Pumping and injection wells.