新型圆台型螺旋能量桩传热模型与换热性能
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摘要
为降低传统圆柱型螺旋能量桩(CyHEP)的轴向与径向热干扰程度以提高传热效率,提出一种新型的圆台螺旋能量桩(CoHEP)。采用格林函数法推导得出CoHEP能够分析圆台型螺旋能源桩换热能力的"影响系数"的概念。研究表明,在相同换热管长的情况下的CoHEP换热性能优于CyHEP,圆锥角越大,"影响系数"越大,强化换热效果越好。在圆锥角相同时,螺距越小,"影响系数"越大,圆台型螺旋能源桩对小螺距情况下的强化传热效果更加显著。
In order to weaken the thermal interference in the generatrix and radial directions,a novel truncated cone helix energy pile is presented and an analytical solution model for the novel energy pile is proposed based on Green's function. The entire average non-dimensional temperature on the pile wall is calculated and the parameter of influence coefficient is employed to analyze the heat transfer performance of helix energy pile. It is indicated that the heat transfer performance of CoHEP is better than that of CyHEP. Higher influence coefficient can be obtained by setting a bigger cone angle and the enhancement of heat transfer is more remarkable with a smaller coils pitch for CoHEP.
In order to weaken the thermal interference in the generatrix and radial directions,a novel truncated cone helix energy pile is presented and an analytical solution model for the novel energy pile is proposed based on Green's function. The entire average non-dimensional temperature on the pile wall is calculated and the parameter of influence coefficient is employed to analyze the heat transfer performance of helix energy pile. It is indicated that the heat transfer performance of CoHEP is better than that of CyHEP. Higher influence coefficient can be obtained by setting a bigger cone angle and the enhancement of heat transfer is more remarkable with a smaller coils pitch for CoHEP.
引文
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[2]Gao Jun,Zhang Xu,Liu Jun,et al.Thermal performance and ground temperature of vertical pilefoundation heat exchangers:A case study[J].Applied Thermal Engineering,2008,28:2295-2304.
[3]Cecinato F,Loveridge F A.Influences on the thermal efficiency of energy piles[J].Energy,2015,82:1021-1033.
[4]Park Hyunku,Lee Seung-Rae,Yoon Seok,et al.Evaluation of thermal response and performance of PHCenergy pile:Field experiments and numerical simulation[J].Applied Energy,2013,103:12-24.
[5]Zarrella Angelo,De Carli Michele.Heat transfer analysis of short helical borehole heat exchangers[J].Applied Energy,2013,102:1477-1491.
[6]Zarrella A,De Carli M,Galgaro A.Thermal performance of two types of energy foundation pile:Helical pipe and triple U-tube[J].Applied Thermal Engineering,2013,2:301-310.
[7]Zarrella A,Capozza A,De Carli M.Analysis of short helical and double U-tube borehole heat exchangers:Asimulation-based comparison[J].Applied Energy,2013,112:358-370.
[8]Carslaw H S,Jaeger J C,Feshbach H.Conduction of heat in solids[J].Physics Today,1962,15(11):74.
[9]Man Yi,Yang Hongxing,Diao Nairen,et al.A new model and analytical solutions for borehole and pile ground heat exchangers[J].International Journal of Heat and Mass Transfer,2010,53(13-14):2593-2601.
[10]Cui Ping,Li Xin,Man Yi,et al.Heat transfer analysis of pile geothermal heat exchangers with spiral coils[J].Applied Energy,2011,88(11):4113-4119
[11]Park SKhan,Lee Seung-Rae,Park Hyunku,et al.Characteristics of an analytical solution for a spiral coil type ground heat exchanger[J].Computers and Geotechnics,2013,49:18-24.
[12]Li Min,Lai A C K.Heat-source solutions to heat conduction in anisotropic media with application to pile and borehole ground heat exchangers[J].Applied Energy,2012,96:451-458.
[13]Wang Deqi,Lu Lin,Cui Ping.A novel compositemedium solution for pile geothermal heat exchangers with spiral coils[J].International Journal of Heat and Mass Transfer,2016,93:760-769.
[14]Zhou Guoqing,Zhou Yang,Zhang Donghai.Analytical solutions for two pile foundation heat exchanger models in a double-layered ground[J].Energy,2016,112:655-668.
[15]Zhang Wenke,Yang Hongxing,Lu Lin,et al.Investigation on heat transfer around buried coils of pile foundation heat exchangers for ground-coupled heat pump applications[J].International Journal of Heat and Mass Transfer,2012,55(21-22):6023-6031.
[16]Zhang Wenke,Yang Hongxing,Lin Lu,et al.The analysis on solid cylindrical heat source model of foundation pile ground heat exchangers with groundwater flow[J].Energy,2013,55:417-425.
[17]Zhang Wenke,Yang Hongxing,Lu Lin,et al.The research on ring-coil heat transfer models of pile foundation ground heat exchangers in the case of groundwater seepage[J].Energy and Buildings,2014,71:115-128.
[18]Zhang Wenke,Yang Hongxing,Cui Ping,et al.Study on spiral source models revealing groundwater transfusion effects on pile foundation ground heat exchangers[J].International Journal of Heat and Mass Transfer,2015,84:119-129.
[19]Wang Deqi,Lu Lin,Zhang Wenke,et al.Numerical and analytical analysis of groundwater influence on the pile geothermal heat exchanger with cast-in spiral coils[J].Applied Energy,2015,160:705-714.
[20]Go Gyu-Hyun,Lee Seung-Rae,Yoon Seok,et al.Design of spiral coil PHC energy pile considering effective borehole thermal resistance and groundwater advection effects[J].Applied Energy,2014,125:165-178.
[21]Go Gyu-Hyun,Lee Seung-Rae,Kang Han-Byul,et al.A novel hybrid design algorithm for spiral coil energy piles that considers groundwater advection[J].Applied Thermal Engineering,2015,78:196-208.
[22]Park Sangwoo,Lee Dongseop,Choi Hyun-Jun,et al.Relative constructability and thermal performance of cast-in-place concrete energy pile:Coil-type GHEX(ground heat exchanger)[J].Energy,2015,81:56-66.
[23]Park Sangwoo,Sung Chihun,Jung Kyoungsik,et al.Constructability and heat exchange efficiency of large diameter cast-in-place energy piles with various configurations of heat exchange pipe[J].Applied Thermal Engineering,2015,90:1061-1071.
[24]Yang Weibo,Lu Pengfei,Chen Yongping.Laboratory investigations of the thermal performance of an energy pile with spiral coil ground heat exchanger[J].Energy and Buildings,2016,128:491-502.
[25]李新.蓄热量桩的传热研究与工程应用[D].济南:山东建筑大学,2011.[25]Li Xin.The heat transfer study and engineering application of energy piles[D].Ji’nan:Shandong Jianzhu University,2011.