技术中心

【英文篇名】 Study on freezing characteristics of soil around ground heat exchangers of ground-source heat pumps based on apparent heat capacity method 【作者中文名】 杨卫波; 施明恒; 刘光远; 陈振乾; 【作者英文名】 Yong Weibo Shi Mingheng Liu Guongyuon Chen Zhenqian Yangzhou University; Yangzhou; Jiangsu Province; China; 【作者单位】 扬州大学; 东南大学; 【文献出处】 暖通空调, Heating Ventilating 地埋管换热器; 土壤冻结; 显热容法; 【英文关键词】 ground-source heat pump; ground heat exchanger; soil freezing; apparent heat capacity method; 【摘要】 为了探讨寒冷地区土壤冻结对地源热泵地埋管换热器换热特性的影响,建立了考虑土壤冻结的地埋管周围土壤传热模型,并利用显热容法对冻结相变问题进行了处理。基于模型的数值求解探讨了土壤含水率、原始温度、热扩散率及Stefan数对埋管周围土壤温度分布及冻结速度的影响。结果显示,与未考虑土壤冻结相比,计算出的地埋管周围土壤温度高,传热热阻小,从而可以减小埋管的设计长度,降低系统初投资;提高土壤含水率有利于地源热泵的设计与运行;减小热扩散率和Stefan数可以有效地降低土壤的冻结速度。 【英文摘要】 In order to search the effect of soil freezing on heat exchange characteristics of ground heat exchangers in cold zone,develops a heat transfer model of soil around ground heat exchangers taking soil freezing into consideration,and solves the freezing phase change problem by apparent heat capacity method. Based on the numerical solution of the model,discusses the influences of the water content in soil,soil initial temperature,soil thermal diffusivity and Stefan number on soil temperature distribution and f...