ISSN 0253-2778

CN 34-1054/N

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Heat transfer simulation for ground heat exchangers with varying heat fluxes

  • 1.

    Exploration Research Institute, Anhui Provincial Bureau of Coal Geology, Hefei 230088, China

  • 2.

    Hefei Research Center of Shallow Geothermal Engineering and Technology, Hefei 230088, China

  • 3.

    School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China

Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2015.06.009
  • Received Date: 16 March 2015
  • Accepted Date: 04 June 2015
  • Rev Recd Date: 04 June 2015
  • Publish Date: 30 June 2015
    Abstract

  • Abstract

    Based on the superposition principle and uniform inlet fluid temperature assumption, the semi-analytical solution to heat transferring of ground heat exchangers (GHEs) with varying heat fluxes was built and validated. The effects of load imbalance and heat interference were further examined. Results indicate that the heat transfer capacity for individual boreholes in GHE depends on the strength of heat interference. If the heat rejected into the ground is greater than the heat absorbed from the ground, the outlet fluid temperature of GHE increases gradually every year. Case study indicates that the outlet fluid temperature of GHE, compared with that in the first year, increases about 0.8 ℃ in the 10th year. The capacity of heat rejection for the GHE becomes smaller with stronger heat interference.

    Abstract

    Based on the superposition principle and uniform inlet fluid temperature assumption, the semi-analytical solution to heat transferring of ground heat exchangers (GHEs) with varying heat fluxes was built and validated. The effects of load imbalance and heat interference were further examined. Results indicate that the heat transfer capacity for individual boreholes in GHE depends on the strength of heat interference. If the heat rejected into the ground is greater than the heat absorbed from the ground, the outlet fluid temperature of GHE increases gradually every year. Case study indicates that the outlet fluid temperature of GHE, compared with that in the first year, increases about 0.8 ℃ in the 10th year. The capacity of heat rejection for the GHE becomes smaller with stronger heat interference.
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    • References(10)
  • [1]
    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，2005.
    [2]
    Eskilson P. Thermalanalysis of heat extraction boreholes [D]. Lund， Sweden: Lund Institute of Technology， 1987.
    [3]
    Zhang Q. Heat transfer analysis of vertical U-tube heat exchange in a multiple borehole field for ground source heat pump systems [D]. Lexington， USA: University of Kentucky, 1999.
    [4]
    Li Xinguo, Zhao Jun, Zhou Qian. Numerical simulation on the ground temperature filed around U pipe underground heat exchangers [J]. Acta Energiae Solaris Sinica, 2004, 21(3): 703-707.
    李新国，赵军，周倩. U型垂直埋管换热器管群周围土壤温度数值模拟[J]. 太阳能学报，2004，21（3）：703-707.
    [5]
    Gao Qing, Li Ming, Yan Yan. Operation strategy on the heat transfer enhancement in the underground multi-boreholes [J]. Acta Energiae Solaris Sinica, 2006, 27(1): 83-89.
    高青,李明,闫燕，地下群井换热强化与运行模式影响规律[J]. 太阳能学报，2006，27（1）：83-89.
    [6]
    Malayappan V, Spitler J D. Limitations of using uniform heat flux assumptions in sizing vertical borehole heat exchanger fields[C]//Proceedings of Clima 2013, Czech: Prague, 2013: 16-19.
    [7]
    Tang Changfu, Zhang Wenyong, Zhu Wenwei, et al.Heat transfer analysis of a multi-borehole heat exchanger of ground source heat pump systems [J]. Journal of University of Science and Technology of China, 2014, 44(11): 921-925.
    汤昌福，张文永，朱文伟，等．土壤源地源热泵地埋管换热器管群换热分析[J]. 中国科学技术大学学报，2014，44(11)：921-925.
    [8]
    Hern S. Design of anexperimental facility for hybrid ground source heat pump systems [D]. Oklahoma, USA: Oklahoma State University, 2004.
    [9]
    Spitler J D, Cullin J, Bernier M, et al.Preliminary intermodel comparison of ground heat exchanger simulation models [C]// Proceedings of the 11th International Conference on Thermal Energy Storage. Stockholm, 2009: 14-17.
    [10]
    Cullin J R. Improvements in design procedure for ground source hybrid ground source and hybrid ground source heat pump systems [D]. Oklahoma, USA: Oklahoma State University, 2008.
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    [1]
    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，2005.
    [2]
    Eskilson P. Thermalanalysis of heat extraction boreholes [D]. Lund， Sweden: Lund Institute of Technology， 1987.
    [3]
    Zhang Q. Heat transfer analysis of vertical U-tube heat exchange in a multiple borehole field for ground source heat pump systems [D]. Lexington， USA: University of Kentucky, 1999.
    [4]
    Li Xinguo, Zhao Jun, Zhou Qian. Numerical simulation on the ground temperature filed around U pipe underground heat exchangers [J]. Acta Energiae Solaris Sinica, 2004, 21(3): 703-707.
    李新国，赵军，周倩. U型垂直埋管换热器管群周围土壤温度数值模拟[J]. 太阳能学报，2004，21（3）：703-707.
    [5]
    Gao Qing, Li Ming, Yan Yan. Operation strategy on the heat transfer enhancement in the underground multi-boreholes [J]. Acta Energiae Solaris Sinica, 2006, 27(1): 83-89.
    高青,李明,闫燕，地下群井换热强化与运行模式影响规律[J]. 太阳能学报，2006，27（1）：83-89.
    [6]
    Malayappan V, Spitler J D. Limitations of using uniform heat flux assumptions in sizing vertical borehole heat exchanger fields[C]//Proceedings of Clima 2013, Czech: Prague, 2013: 16-19.
    [7]
    Tang Changfu, Zhang Wenyong, Zhu Wenwei, et al.Heat transfer analysis of a multi-borehole heat exchanger of ground source heat pump systems [J]. Journal of University of Science and Technology of China, 2014, 44(11): 921-925.
    汤昌福，张文永，朱文伟，等．土壤源地源热泵地埋管换热器管群换热分析[J]. 中国科学技术大学学报，2014，44(11)：921-925.
    [8]
    Hern S. Design of anexperimental facility for hybrid ground source heat pump systems [D]. Oklahoma, USA: Oklahoma State University, 2004.
    [9]
    Spitler J D, Cullin J, Bernier M, et al.Preliminary intermodel comparison of ground heat exchanger simulation models [C]// Proceedings of the 11th International Conference on Thermal Energy Storage. Stockholm, 2009: 14-17.
    [10]
    Cullin J R. Improvements in design procedure for ground source hybrid ground source and hybrid ground source heat pump systems [D]. Oklahoma, USA: Oklahoma State University, 2008.
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