冬季工况地埋管换热器换热特性的影响因素  

Thermal performance of ground heat exchanger under winter conditions

作　　者：赵天雨 朱启银 杨强 朱冠宇 赵耿 庄培芝 ZHAO Tianyu;ZHU Qiyin;YANG Qiang;ZHU Guanyu;ZHAO Geng;ZHUANG Peizhi(State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu Province,P.R.China;School of Mechanical and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu Province,P.R.China;Jinan Jinqu Road Survey Design Research Co.Ltd.,Jinan 250020,Shandong Province,P.R.China;School of Qilu Transportation,Shandong University,Jinan 250002,Shandong Province,P.R.China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]济南金衢公路勘察设计研究有限公司,山东济南250020 [4]山东大学齐鲁交通学院,山东济南250002

出　　处：《深圳大学学报（理工版）》2022年第1期28-35,共8页Journal of Shenzhen University(Science and Engineering)

基　　金：中央高校基本科研业务费资助项目(2020ZDPYMS08)。

摘　　要：地埋管地源热泵技术可为冬季桥梁融雪工程提供绿色、环保的解决方案,但冬季工况地埋管换热效率的影响因素尚不明确.针对单U型地埋管换热器,采用数值计算方法,研究入口温度、回填材料配比、孔深和间距对冬季取热能力及周围土壤温度分布的影响.结合某桥梁实际供暖工况,建立3种不同埋深的单个换热器模型及3种不同间距的换热器群模型,并进行多工况条件下的影响因素对比分析.结果表明,系统运行48 h时,入口温度为2℃条件下的换热功率将较8℃时提高约82%;降低回填料中膨润土的质量分数有利于换热;随着换热器深度增加,每延米取热能力下降;扩大换热器间距可减弱彼此间的热干扰效应;运行8 h时,间距4 m条件下较间距3 m时换热功率提高5.4%,间距5 m条件下较间距4 m时提高1.9%.The use of buried pipe ground source heat pump technology can provide a green and environmentally friendly solution for the winter bridge snow melting project. However, the factors affecting the heat transfer efficiency of buried pipes in winter conditions are still unclear. For the single U-bend buried pipe heat exchanger, numerical calculations were preformed to study the effects of different inlet temperatures, backfill material ratio, hole depth, and spacing on the heat extraction capacity and the surrounding soil temperature distribution. Combined with an actual bridge heating project, three single heat exchanger models with different buried depths and three heat exchanger group models with different spacing were established. The results show that when the system runs for 48 hours, the heat transfer power at 2 ℃ will increase by about 82% compared with that at 8 ℃. Reducing the content of bentonite in the backfill is beneficial to heat transfer. As the heat exchanger depth increases, the heat extraction capacity per linear meter decreases. The expansion of the heat exchanger spacing can reduce the thermal interference effect between each other. When running 8 hours, the heat transfer power at an interval of 4 m is increased by 5.4%compared with that at the interval of 3 m, and the heat transfer power at an interval of 5 m is increased by 1.9%compared with that at the interval of 4 m.

关 键 词：岩土工程 地埋管换热器 冬季工况 数值模拟 换热效率 土壤温度场 

分 类 号：TU962[建筑科学]