深层地埋管换热器换热性能模拟及稳定性研究

RESEARCH ON HEAT TRANSFER PERFORMANCE AND STABILITY OF DEEP BOREHOLE HEAT EXCHANGER

以深层地源热泵地埋管换热器为研究对象,对其换热特性进行数值模拟和实验研究。建立考虑轴向地温梯度的深层地埋管换热器传热模型并进行模拟计算,通过示范工程现场测试数据验证该模型的正确性。对深层地埋管换热器换热的性能稳定性进行研究,发现深层地埋管换热器连续长期运行及间歇长期运行下换热性能基本稳定。当按不同运停比运行时,岩土温度恢复效果良好。研究结果表明深层地源热泵有较好的换热性能及运行稳定性,为深层地热能的开发利用提供了新思路。

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.