矩形直肋地埋管换热器换热特性模拟分析
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摘要
为强化地源热泵系统竖直地埋管换热器换热性能,设计了一种矩形直肋地埋管换热器,建立了矩形直肋地埋管换热器地下传热模型,利用Matlab软件模拟分析了直肋地埋管结构参数、运行参数对单U型和双U型地埋管换热器换热性能的影响。结果表明:当入口水温32℃,流速0.6 m/s,埋深100 m时,8片直肋单U型与双U型PE地埋管的单位埋深换热量与光滑管相比,分别提高了19.12%和18.28%。根据矩形直肋地埋管各参数与单位埋深换热量的相关性分析,肋片高度和肋片个数对换热性能的影响最为显著。
To enhance the heat exchange performance of vertical ground heat exchangers(GHE) for ground source heat pump system, a ground heat exchanger with radial rectangular fins was designed, and ground heat transfer model was established. Matlab software was utilized to simulate and analyze the effects of structure parameters and operation parameters of ground heat exchanger with radial rectangular fins on the thermal performance of single U-tube and double U-tube ground heat exchangers. The simulation results show that the heat exchange capacity per unit borehole depth of single-U and double-U PE tube with 8 fins is 19.12% and 18.28% higher than that of the smooth U-tube, under the condition of the inlet water temperature of 32 ℃, the flow rate of 0.6 m/s and the buried depth of 100 m. According to the correlation analysis between parameters and heat exchange capacity per unit borehole depth, the effect of fin height and number of fins on heat exchange performance are most significant.
To enhance the heat exchange performance of vertical ground heat exchangers(GHE) for ground source heat pump system, a ground heat exchanger with radial rectangular fins was designed, and ground heat transfer model was established. Matlab software was utilized to simulate and analyze the effects of structure parameters and operation parameters of ground heat exchanger with radial rectangular fins on the thermal performance of single U-tube and double U-tube ground heat exchangers. The simulation results show that the heat exchange capacity per unit borehole depth of single-U and double-U PE tube with 8 fins is 19.12% and 18.28% higher than that of the smooth U-tube, under the condition of the inlet water temperature of 32 ℃, the flow rate of 0.6 m/s and the buried depth of 100 m. According to the correlation analysis between parameters and heat exchange capacity per unit borehole depth, the effect of fin height and number of fins on heat exchange performance are most significant.
引文
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[17] 段新胜,林清龙,毛汉川,等.岩土层原位导热系数的多元线性回归分析方法[J].太阳能学报,2018,39(2):385-389.
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[20] 陈卫翠,刘巧玲,贾立群,等.高性能地埋管换热器钻孔回填材料的实验研究[J].暖通空调,2006,36(9):1-6.
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[2] Lee C,Park M,Nguyen T B,et al.Performance evaluation of closed-loop vertical ground heat exchangers by conducting in-situ thermal response tests[J].Renewable Energy,2012,42(1):77-83.
[3] Borinaga-Trevino R,Norambuena-Contreras J,Castro-Fresno D.How to correct the ambient temperature influence on the thermal response test results[J].Applied Thermal Engineering,2015,82(3):39-47.
[4] 王宏磊.土壤源热泵U型内肋埋管换热器传热特性竖直模拟[D].西安:西安科技大学,2011:47-48.
[5] 肖益民,刘希臣,张华廷,等.竖直地埋管换热器的结构改进与性能试验[J].哈尔滨工业大学学报,2015,47(2):92-97.
[6] 袁亚飞.土壤源热泵垂直埋管微肋换热器的强化换热性能研究[D].西安:长安大学,2017:37-62.
[7] Ren C,Deng Y L,Cao S J.Evaluation of polyethylene and steel heat exchangers of ground source heat pump systems based on seasonal performance comparison and life cycle assessment[J].Energy and Buildings,2018,162:54-64.
[8] Hellstom G.Ground heat storage:Thermal analyses of duct storage systems[D].Skane:University of Lund,1991:73-98.
[9] Eskilson P.Thermal analysis of heat extraction boreholes[D].Skane:University of Lund,1987:8-12.
[10] 刁乃仁,曾和义,方肇洪.竖直U型管地热换热器的准三维传热模型[J].热能动力工程,2003,18(4):387-390.
[11] 曾和义,方肇洪.U型管地热换热器中介质轴向温度的数学模型[J].山东建筑工程学院学报,2002,17(1):7-11.
[12] Zeng H Y,Diao N R,Fang Z H.Heat transfer analysis of boreholes in vertical ground heat exchangers[J].International Journal of Heat and Mass Transfer,2003,46(23):4467-4481.
[13] 曾和义,刁乃仁,方肇洪.竖直埋管地热换热器的稳态温度场分析[J].山东建筑工程学院学报,2002,17(1):1-6.
[14] 曾和义,刁乃仁,方肇洪.竖直埋管地热换热器钻孔内的传热分析[J].太阳能学报,2004,25(3):399-405.
[15] 曾和义,方肇洪.双U型埋管地热换热器的传热模型[J].山东建筑工程学院学报,2003,18(1):11-17.
[16] 朱祖文,蒋云云,何一坚.天津地区双U型地源热泵地埋管换热器性能模拟研究[J].流体机械,2013,41(6):58-64.
[17] 段新胜,林清龙,毛汉川,等.岩土层原位导热系数的多元线性回归分析方法[J].太阳能学报,2018,39(2):385-389.
[18] 刁乃仁,方肇洪.地埋管地源热泵技术[M].北京:高等教育出版社,2006:123.
[19] 中国气象数据网.中国地面累年值月值数据集(1981-2010年)[G/OL].(2012-08-28)[2018-09-10].http://data.cma.cn/data/detail/dataCode/A.0029.0004.html
[20] 陈卫翠,刘巧玲,贾立群,等.高性能地埋管换热器钻孔回填材料的实验研究[J].暖通空调,2006,36(9):1-6.
[21] 丁勇,李百战,卢军,等.地源热泵系统地下埋管换热器设计[J].暖通空调,2005,35(3):86-89.