考虑岩土分层的不同管材地埋管换热器换热性能研究

STUDY ON HEAT TRANSFER PERFORMANCE OF GROUND HEAT EXCHANGERS WITH DIFFERENT PIPES CONSIDERING LAYERED STRATUM

以竖直U型地源热泵地埋管换热器为研究对象,考虑岩土分层,设计一种复合管材,模拟分析传统PE管材、复合管材的换热性能,并根据区段能效系数设计复合管材、复合管材+PE管材布置形式,进一步探究两种布置形式的换热性能、经济性。结果表明:地埋管换热器使用复合管材能显著提高换热性能,特别是在进水管段及出水管段下部使用复合管材换热能力明显增强,在出水管段中、上部使用复合管材对提升换热性能不明显;复合管材+PE管材与复合管材布置形式换热性能相差甚小,但复合管材+PE管材布置形式管间热短路影响更小、更经济。

This study focuses on the vertical U-shaped ground source heat pump underground pipe heat exchanger.It takes into account the layered stratum and aims to design a composite pipe.The heat exchange performance of both traditional PE pipes and composite pipes is simulated and analyzed.Additionally,the layout of composite pipes and composite pipes+PE pipes is designed based on the energy efficiency coefficient of the section.The study further explores the heat exchange performance and economic aspects of these two arrangement types.The findings indicate that using composite pipes within buried pipe heat exchangers yields a substantial enhancement in heat transfer efficiency.Notably,the utilization of composite pipes within the lower segments of the water inlet and outlet pipe sections greatly augments the heat exchange capability.The utilization of composite pipes in the central and upper segments of the water outlet pipe section does not yield a significant enhancement in heat transfer performance.There is little difference in heat transfer performance between the arrangement of composite pipe+PE pipe and the layout solely consisting of composite pipe is minimal.However,the composite pipe+PE pipe configuration has less impact on of thermal short circuit between pipes and is to be a more economic.