地埋管换热器低温换热性能测试与模拟
Heat transfer performance experiment and simulation of ground heat exchanger in low temperature condition
摘要：
实验并模拟了地埋管换热器持续低温运行对换热及土壤温度分布的影响，实测的运行取热换热量能保持在60~85 W/m，且无明显衰减，满足地源热泵系统取热需求。采用计算流体力学软件对冻结工况进行了模拟，实验数据验证了模型对回水温度、换热量、近壁侧温度模拟的有效性。后续理想条件下的模拟结果从理论上说明了低温供水工况在补热得当情况下可以保证地埋管换热器的较高换热能力，且对土壤温度环境影响可控。
Abstract：
Experiments and simulates the impact on heat exchange and soil temperature distribution in continuous low temperature operation of ground heat exchangers. The measured heat transfer capacity in operation can be maintained at 60 W/m to 85 W/m without sensible decreasing, which meets the heat demand of ground-source heat pump system. Simulates the freezing condition by computational fluid dynamics software, and verifies the validity of the model in return water temperature, heat transfer capacity and temperature on external side of exchanger pipes by the experimental data. Further simulation results based on ideal conditions indicate that high heat transfer performance of ground heat exchanger can be achieved in low temperature operation condition by reasonable heat supplement, and the impact on soil temperature is controllable.
Keywords:freezingcondition,groundheatexchanger,lowtemperature,thermalbalance,experimentalanalysis,numericalsimulation