Research On Rock-soil Thermal Properties In Ground Source Heat Pump System Based On Experiment Apparatus

As a new application method of renewable energy, ground source heat pump system has been promoted greatly in domestic. This technology has developed rapidly in recent years, but it also has a lot of problems. In order to ensure the long-term development of ground source heat pump system, it is necessary for us to figure out the influence on buried pipe heat exchanger of different factors.At present, there are many researches on the mathematical model of the buried pipe heat exchanger, but there are very few experiment research on heat transfer of the buried pipe heat exchanger. This is mainly due to the complexity of underground soil environment, the underground geological conditions are varied in different places, it is difficult to do experiment research on the impact of different factors on buried pipe heat transfer. An experiment apparatus was established based on the similarity principle and actual thermal response test(TRT) in order to do experiment research on buried pipe heat transfer. On the basis of the experimental apparatus, analyze the experiment data by line heat source model, complex line heat source model and Beier model respectively, and compare the difference of thermal physical parameters calculated by these three mathematic models.Some experiment researches were conducted on this experiment apparatus, studied the impact of heating power, circulating flow rate in the buried pipe, test time and groundwater seepage, analyzed how these factors influence the thermal physical property parameters, the heat transfer and the soil temperature field.This experiment apparatus provides a new method to study the impact of different factors to the GHE. The analysis can provide a better theoretical basis for the design of a GSHP system.