地源热泵不同地源换热器的传热性能比较

Comparison of heat transfer performances between soil type ground coupled heat exchangers and a surface water heat Exchanger

本文针对地源热泵的核心技术问题,介绍了对两种典型地源换热器的散热试验研究:粉质粘土中的垂直单U管、地表水中的水平单U管。研究发现,两种换热器的传热性能差别很大。从开始试验到循环水温度稳定所需要的过渡时间上,地表水换热器比粉质粘土埋管型换热器要快得多。从传热能力来看,地表水换热器的单位管长换热量比粉质粘土垂直单U管要大。

Focused on key technology issues for geothermal heat pumps, this article analyzed 2 typical U shaped ground source heat exchangers： a heat exchanger vertically installed in clay soil, and a heat exchanger horizontally installed in a lake. Heat dissipation tests with constant heat flux were carried out and the results were analyzed. As the transient time required to reach stable fluid temperatures is concerned, surface water heat exchanger required far less time than the clay soil type heat exchanger. As heat transfer capacity per pipe length is concerned, surface water heat exchanger is higher than that of the clay soil type heat exchanger.