竖直埋管及桩基内埋管换热器传热模型研究进展

Review of Analytical Models for Vertical-borehole Ground Heat Exchangers and Energy Piles

地埋管换热器是一种能利用浅层土壤地温能的新型节能技术。回顾了竖直埋管和桩基埋管换热器的传热机理与孔外解析传热模型,根据不同简化模式对模型进行综述,主要分为:无限长、有限长线热源;无限长、有限长柱面热源,以及螺旋热源和各向异性土中传热模型等。并且,针对桩基和竖直埋管的区别,对这些传热模型进行比较,总结出不同模型对不同换热器的适用性。最后,基于模型的发展趋势,给出目前存在的问题及发展方向。

Geothermal heat exchangers, which can utilize shallow geothermal energy, is an inno- vative energy-saving technology. In this paper, principle of heat transfer underground is firstly introduced, then developments of analytical models of vertical-borehole ground heat exchangers and energy piles are overviewed. Infinite/finite line heat source, cylindrical heat source and spiral heat source models are mainly discussed and compared. The influence of anisotropic heat transfer media （soil） is also summarized. Finally, the feasibility of different models is recommended ac- cording to particular circumstances and the current problems and potential development direction are stressed.