STUDY ON THE FREEZING CHARACTERISTICS OF SOIL SURROUNDING THE GROUND HEAT EXCHANGER OF GROUND COUPLED HEAT PUMP
The study on freezing characteristics of soil surrounding the GHE of GCHP is performed based on the apparent heat capacity method. The influences of the soil water content, initial temperature, thermal diffusivity and Stefan number on soil temperature distribution and freezing velocity are discussed, the results indicate that the computed soil temperature, compared with unfreezing, is higher and thus the heat transfer resistance is smaller. This contributes to the decrease of GHE design length and system initial cost. It also proves that the increase of water content in soil is favourable to the design and operation of GCHP. Moreover, the increase of soil thermal diffusivity and the decrease of Stefan number can stay effectively the freezing velocity. These results may provide a preference for the application of GCHP in north districts.
Weibo YANG Mingheng SHI Zhenqian CHEN
School of Energy and Environment of Southeast University, 2 Sipailou, Nanjing, P.R.China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）