邹行,裴鹏,郝定溢,王沉
ZOU Hang,PEI Peng,HAO Dingyi,WANG Chen

• 1:贵州大学矿业学院
• 2:中国矿业大学矿业工程学院

摘要(Abstract)：

为揭示地源热泵系统水平埋管换热器在不同土壤类型中的换热性能,基于土壤毛管水理论知识,结合数值模拟的研究手段,探讨了蓄能不同类型土体内(砂土、壤土、黏土)三相组成的差异对水平埋管换热器换热特性的影响规律。结果表明,在通入308.15 K制冷工况下,水平管在壤土中的出水温度降低至303.3 K,进出口水温差为4.9 K,埋管单位延米换热量37.1 W/m,水平管在壤土中的制冷换热效益显著;不同土壤(砂土、壤土、黏土)在经历相同制冷周期下,水平管的换热过程对壤土的温度场分布影响最小,管体在壤土中运行时热堆积风险系数最低。研究表明,水平管与土壤的换热性能同时受土壤比热容与土壤导热系数的影响,提高土壤导热系数比提高土壤比热容获得的效益更加显著。可以通过压实回填、减少土壤孔隙率、提高固相回填材料导热系数、加大布管深度以提高回填材料含水率等方法来强化埋管的换热性能。
In order to reveal the heat transfer performance of the horizontal buried pipe heat exchanger in the ground source heat pump system in different soil types, this paper, based on the theoretical knowledge of soil capillary water, combined with the means of numerical simulation, discusses the influence of the difference of three-phase composition in different types of energy storage soil on the heat transfer characteristics of the horizontal buried pipe heat exchanger. The results show that under the cooling condition of 308.15 K, the outlet water temperature of the horizontal pipe in the loam soil decreases to 303.3 K and the temperature difference between the inlet and outlet water is 4.9 K. The heat transfer perlinear meter of the buried pipe is 37.1 W/m. That means the heat transfer efficiency of the horizontal pipe in the loam soil is significant. When different soils(sandy soil, loam soil and clay soil) go through the same refrigeration cycle, the heat transfer process of the horizontal pipe has the least effect on the temperature distribution of loam soil, with the lowest thermal accumulation risk coefficient of the pipe. The research result shows that the soil heat conductivity has greater impact on the heat exchange capability of the horizontal pipe than the soil specific heat capacity. The heat transfer capacity of the horizontal pipe can be enhanced by compacting back fill materials, decreasing the porosity, improving the soil phase conductivity, and increasing the buried depth to utilize the higher specific heat capacity of groundwater.

关键词(KeyWords)： 地源热泵;水平埋管;三相组成;毛管水;出口水温
ground source heat pump;horizontal buried pipe;three-phase composition;capillary water;outlet water temperature

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51864008,52066005);; 贵州省科技支撑计划项目(黔科合支撑﹝2020﹞2Y025)

作者(Author): 邹行,裴鹏,郝定溢,王沉
ZOU Hang,PEI Peng,HAO Dingyi,WANG Chen

参考文献(References)：

• [1]李永强，徐拴海，张卫东，等.套管式地埋管换热器热短路及换热性能[J].煤田地质与勘探，2020,48(1):183-188.LI Yongqiang,XU Shuanhai,ZHANG Weidong,et al.Thermal short-circuiting and heat transfer performance of coaxial borehole heat exchanger[J].Coal Geology&Exploration,2020,48(1):183-188.
• [2]尚宏波，赵春虎，靳德武，等.中深层地热单井换热数值计算[J].煤田地质与勘探，2019,47(6):159-166.SHANG Hongbo,ZHAO Chunhu,JIN Dewu,et al.Numerical calculation of heat transfer in single medium-deep geothermal well[J].Coal Geology&Exploration,2019,47(6):159-166.
• [3]吕艺青，傅允准.地源热泵系统夏季制冷间歇运行特性实验研究[J].太阳能学报，2018,39(2):453-460.LYU Yiqing,FU Yunzhun.Experimental research of performance for refrigeration intermittent operation in summer of GSHPsystem[J].Acta Energiae Solaris Sinica,2018,39(2):453-460.
• [4]马最良，吕悦.地源热泵系统设计与应用[M].北京：机械工业出版社，2007.MA Zuiliang,LYU Yue.Design and application of ground source heat pump system[M].Beijing:China Machine Press,2007.
• [5]李新国.埋地换热器内热源理论与地源热泵运行特性研究[D].天津：天津大学，2004.LI Xinguo.Study on inner heat source of underground heat exchanger and the ground coupled heat pump’s performance[D].Tianjin:Tianjin University,2004.
• [6]PLATTS A B,CAMERON D A,WARD J.Improving the performance of ground coupled heat exchangers in unsaturated soils[J].Energy Buildings,2015,104:323-335.
• [7]NOWAMOOZ H,NIKOOSOKHAN S,LIN Jian,et al.Finite difference modeling of heat distribution in multilayer soils with time-spatial hydrothermal properties[J].Renewable Energy,2015,76:7-15.
• [8]BEAR J,BENSABAT J,NIR A.Heat and mass transfer in unsaturated porous media at a hot boundary:I.One-dimensional analytical model[J].Transport in Porous Media,1991,6(3):281-298.
• [9]林芸，赵强，方肇洪.水平螺旋地埋管地源热泵的研究[J].暖通空调，2010,40(4):104-109.LIN Yun,ZHAO Qiang,FANG Zhaohong.Ground-source heat pump systems with horizontal spiral ground heat exchangers[J].Heating Ventilating&Air Conditioning,2010,40(4):104-109.
• [10]李广信，张丙印，于玉贞.土力学(第2版)[M].北京：清华大学出版社，2013.LI Guangxin,ZHANG Bingyin,Yu YUzhen.Soil mechanics(Second Edition)[M].Beijing:Tsinghua University Press,2013.
• [11]LU Ning,LIKOS W J.Unsaturated soil mechanics[M].Hoboken,New Jersey:John Wiley&Sons Inc,2004.
• [12]CHOI J C,LEE S R,LEE D S.Numerical simulation of vertical ground heat exchangers:Intermittent operation in unsaturated soil conditions[J/OL].Computers and Geotechnics,2011,38(8):949-958.
• [13]VAN GENUCHTEN M Th.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44(5):892-898.
• [14]张玲.土壤热湿传递与土壤源热泵的理论与实验研究[D].杭州：浙江大学，2006.ZHANG Ling.Theoretical and experimental study on heat and moisture transfer in soil and ground-source heat pump[D].Hangzhou:Zhejiang University,2006.
• [15]陈振乾，施明恒，虞维平.研究土壤热湿迁移特性的非平衡热力学方法[J].土壤学报，1998,35(2):218-226.CHEN Zhenqian,SHI Mingheng,YU Weiping.Non-equilibrium thermodynamics method of heat and moisture transport properties in unsaturated soils[J].Acta Pedologica Sinica,1998,35(2):218-226.
• [16]ZHOU W S,PEI P,HAO D Y,et al.A numerical study on the performance of ground heat exchanger buried in fractured rock bodies[J].Energies,2020,13:1647.
• [17]钱家欢，殷宗泽.土工原理与计算[M].北京：中国水利水电出版社，1996.QIAN Jiahuan,YIN Zongze.Geotechnical principle and calculation[M].Beijing:China Water&Power Press,1996.
• [18]李恩羊.达西定律及其在非饱和土壤中的推广应用[J].农田水利与小水电，1981(1):42-44.LI Enyang.Darcy’s Law and its application in unsaturated soil[J].Farmland Water Conservancy and Small Hydropower,1981(1):42-44.
• [19]HEIN P,KOLDITZ O,G?RKE U,et al.A numerical study on the sustainability and efficiency of borehole heat exchanger coupled ground source heat pump systems[J/OL].Applied Thermal Engineering,2016,100:421-433.

文章评论(Comment)：