Experiment Research Of Underground Heat Exchangers Under Coupled Thermal Conduction And Groundwater Advection Conditions

For recent years, both the energy and environmental problems are getting worse, the intense one of which is the short supply of electricity sources, and thus drive people to look for the countermeasures for them. Ground source heat pump (GSHP) system is one of the most promising innovative air-conditioning technology aimed at energy conservation and environmental protection, so it receives more and more attentions. And it is one of the most advanced tasks in international HVAC industry, too. One of the key techniques for GSHP popularization and application is to perfect heat transfer models for the ground heat exchangers to simulate the actual heat exchange process.Based on the analysis of the current state of experimental researches both at home and abroad, found most of researches about GSHP were the onefold theoretical analysis on heat transfer. However the research of the influence of the buried pipes heat exchanger under ground water infiltration was so few. There are many researchers and engineers who have cognizance of this and have make mention of some qualitative analysises. But because this problem is very complex, the present job mainly focus on the numerical simulation methods. It is short of experimental confirmation. A experimental platform of GSHP sand tank was set up, which can simulate groundwater flow and fit for many conditions. besides that, the changes of the soil temperature field around the buried pipes heat exchanger for GSHP are analyzed.The experimental platform based on Darcy-theory. In order to research into the influence of the soil temperature field around the buried pipes heat exchanger under different heating load or different seepage velocity.The experiment spent nearly eighty days from October 8 on 2005. This experiment includes more than thirty conditions. The main conditions are the parameters of ground physics experiment, unsaturated sand experiment, saturated sand experiment, the soil temperature field under the invariable velocity of the infiltration flow of ground water and the soil temperature field under the variable velocity of the infiltration flow of ground water.In the paper, based on the error analysis of experimental device, arriving at...