基于层换热理论的竖埋管地下换热器设计方法

In this article, a 3-D mathematic model for heat transferring temperature field of vertically buried heat interchanger of GSHP(Ground Source Heat Pumps)system was presented and the mechanism of heat transfer of the interchanger was calculated to form the laminated heat transfer theory. The temperature field distribution of the vertically buried heat interchanger and its surrounding earth rock was proved to fall out three heat transferring areas-the fully- heat- transferring area, heat transferring area, and the none- heat-transferring area. The three-area heat transfer theory has denied part of conclusions based on the 2-D heat transfer theory. The comparison indicated that the heat transfer theory and the practical testing data collected from real construction sites dovetailed nicely. On such base, the author pointed out the wrong methods which were employed in designing the ground heat interchanger at present, furthermore, put forwards the new methods such as the deeply bury under dynamic load. The study results will be of great significance in application and promotion of the design of heat-cold combined supply of underground energy storage in the long run.