强制渗流作用下的耦合式土壤源热泵运行模式研究Research on Operation Mode of the Coupled Ground Source Heat Pump under Forced Seepage
马玖辰,邵刚,王宇,王文君,冯佳
MA Jiu-chen,SHAO Gang,WANG Yu,WANG Wen-jun,FENG Jia
摘要(Abstract)：
以多孔介质传热、传质理论以及有限长移动线热源模型为基础,建立了地埋管换热器井孔内、外传热数学模型。基于抽、回灌井不同运行时长,对耦合式土壤源热泵系统的全年运行过程进行了数值模拟。通过模拟计算,抽、回灌井运行24 h比抽、回灌井运行8,16 h地埋管单位井深换热量分别增加了32.7%,9.2%,对应能效系数提高了34.4%,11.2%,然而此时耗电量却增加了200%,50%。研究表明,抽、回灌井运行时间越长,地埋管单位井深换热量越高,系统的运行能耗持续增加。因此针对所建耦合式土壤源热泵系统,通过采取抽、回灌井开启10~14 h的运行模式,能够有效地降低系统的运行能耗,进而使该耦合式系统得到合理的应用。
Based on the theory of heat transfer and mass transfer in porous media and the finite-length moving line heat source model,mathematical models for internal and external heat transfer in borehole of heat exchanger were established. And based on different operation durations for borehole pumping and recharging,the annual running process of the coupled ground source heat pump system was numerically simulated. Through simulation analysis,the heat exchange capacity of buried pipe per unit of borehole depth was increased by 32.7% and 9.2%,respectively after 24 hours pumping and recharging operation compared with that after 8 hours and 16 hours pumping and recharging operation,and the corresponding energy efficiency coefficient was increased by 34.4% and 11.2%,respectively,however,the power consumption was increased by 200%,50%,respectively. The research results show that the longer the borehole pumping and recharging operation time,the higher the heat exchange capacity of buried pipe per unit of borehole depth,and the system operating energy consumption continues to increase. Therefore,if the operation mode of 10 hours to 14 hours for borehole pumping and recharging is adopted,the proposed coupled ground-source heat pump system can effectively reduce the operating energy consumption of the system,and thus makes the coupled system reasonably applied.
关键词(KeyWords)：
土壤源热泵;数值模拟;运行模式;单位井深换热量
ground-source heat pump;numerical simulation;operating mode;heat exchange per unit depth
基金项目(Foundation): 国家自然科学基金项目(41402228);; 国家级大学生创新创业项目(201710792005);; 天津市自然科学基金企业科技特派员项目(17JCTPJC52900)
作者(Author):
马玖辰,邵刚,王宇,王文君,冯佳
MA Jiu-chen,SHAO Gang,WANG Yu,WANG Wen-jun,FENG Jia
参考文献(References)：
- [1]国家发展与改革委员会.地热能开发利用“十三五”规划[EB/OL].http://www.ndrc.gov.cn/zcfb/zcfbghwb/201702/t20170204_837204.html
- [2]Sagia Z,Rakopoulos C,Kakaras E,et al.Cooling dominatedhybridgroundsourceheatpumpsystem application[J].Applied Energy,2012,94(6):41-47.
- [3]Angelotti A,Alberti L,La Licata I,et al.Energy performanceandthermalimpactofaborehole heatexchangerinasandyaquifer:influenceofthe groundwatervelocity[J].EnergyConversionand Management,2014,77:700-708.
- [4]杨卫波,陈振乾,施明恒.垂直U型管换热器准三维热渗耦合模型及其实验验证[J].太阳能学报,2011,32(3):383-389.
- [5]杨卫波,施明恒,陈振乾.基于准三维模型的垂直U型埋管换热特性影响因素的分析[J].流体机械,2012,40(4):56-62.
- [6]ZanchiniE,LazzariS,Priarone.ALong-term Performance of Large Borehole Heat Exchanger Fields withUnbalancedSeasonalLoadsandGroundwater Flow[J].Energy,2012,38(1):66-77.
- [7]蔡晶晶,陈汝东.地下水渗流对地埋管传热影响的理论分析[J].流体机械,2009,37(12):62-68.
- [8]马玖辰,张志刚.耦合抽-灌井式埋地换热系统咸水层传热过程研究[J].流体机械,2015,43(12):55-60.
- [9]Diao N R,Li Q Y,Fang Z H. Heat transfer in ground heatexchangerswithgroundwateradvection[J]. International Journal of Thermal Sciences,2004(43):1203-1211.
- [10]Diersch HJG,Bauer D,Heidemann W,et al. Finite element modeling of borehole heat exchanger systems:part1.Fundamentals[J].ComputerGeosciences,2011,37(15):1122-1135.
- [11]NamY,OolcaR,HwangS.Developmentofa numericalmodeltopredictheatexchangeratesfor aground-sourceheatpumpsystem[J].Energyand Buildings,2008,40(12):2133-2140.
- [12]Hecht-Mendez J,Paly M,Beck M,et al. Optimization of energy extraction for vertical closed-loop geothermal systemsconsideringgroundwaterflow[J].Energy Conversion and Management,2013,66(11):1-10.
- [13]Eskilson P,Claesson J.Simulation model for thermally interactingheatextractionboreholes[J].Numerical Heat Transfer,1988,13(2):149-165.
- [14]杨卫波,孔磊,尹艳山.水平螺旋型地埋管换热器换热特性的数值模拟与试验验证[J].流体机械,2018,46(6):60-67.
- [15]於仲义.土壤源热泵垂直地埋管换热器传热特性研究[D].武汉:华中科技大学,2008.