深层地埋管换热器换热性能模拟及稳定性研究

Deep borehole heat exchanger of deep ground-source heat pump is investigated by numerical simulation and experimental validation. The deep borehole heat exchanger heat transfer model concerning the axial temperature gradient is established by Matlab, the simulated calculations and the accuracy of model are proved by demonstration project test data. Through a study on the stability of heat transfer performance of deep borehole heat exchanger, it is found that the performance of deep borehole heat exchanger is basically stable. Soil temperature recovery is fine at different run-stop ratios. The research shows that the deep borehole heat exchanger has better heat exchange performance and operation stability, provides a new idea for the development and application of deep geothermal energy.