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Thermal conductivity determination of ground by new modified two dimensional analytical models: Study cases

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  • Dehghan B, Babak

Abstract

Determining thermal conductivity of ground plays an important role in designing procedure of ground source heat pump (GSHP) systems. In this paper new modified 2D analytical models which are depending on thermal conductivity of ground are derived and results are compared with experimental ones. In an experimental study, a single borehole ground heat exchanger (GHE) with polyethylene U-tube pipe is considered for two different regions. Fluid is pumped into the pipes in a specific temperature and inlet and outlet temperatures are measured as well as volumetric flow rate. Analytical results curves are fitted to experimental one and thermal conductivities of ground are calculated for each region. Based on validated analytical models, long term performance of a single borehole GHE is determined. Additionally, temperature distributions around borehole GHE are investigated analytically in region 1 (N.D.B. residence region). Analytical models given in this study can easily help designers to evaluate thermal conductivity of ground and thermal performance of the borehole GHEs.

Suggested Citation

  • Dehghan B, Babak, 2018. "Thermal conductivity determination of ground by new modified two dimensional analytical models: Study cases," Renewable Energy, Elsevier, vol. 118(C), pages 393-401.
    • Handle: RePEc:eee:renene:v:118:y:2018:i:c:p:393-401
    DOI: 10.1016/j.renene.2017.11.037
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    References listed on IDEAS

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    1. Dehghan B., Babak & Kukrer, Ergin, 2017. "A new 1D analytical model for investigating the long term heat transfer rate of a borehole ground heat exchanger by Green's function method," Renewable Energy, Elsevier, vol. 108(C), pages 615-621.
    2. Atam, Ercan & Helsen, Lieve, 2016. "Ground-coupled heat pumps: Part 1 – Literature review and research challenges in modeling and optimal control," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1653-1667.
    3. Selamat, Salsuwanda & Miyara, Akio & Kariya, Keishi, 2016. "Numerical study of horizontal ground heat exchangers for design optimization," Renewable Energy, Elsevier, vol. 95(C), pages 561-573.
    4. Zhang, Changxing & Hu, Songtao & Liu, Yufeng & Wang, Qing, 2016. "Optimal design of borehole heat exchangers based on hourly load simulation," Energy, Elsevier, vol. 116(P1), pages 1180-1190.
    5. Atam, Ercan & Helsen, Lieve, 2016. "Ground-coupled heat pumps: Part 2—Literature review and research challenges in optimal design," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1668-1684.
    6. Florides, Georgios A. & Christodoulides, Paul & Pouloupatis, Panayiotis, 2013. "Single and double U-tube ground heat exchangers in multiple-layer substrates," Applied Energy, Elsevier, vol. 102(C), pages 364-373.
    7. Beier, Richard A. & Spitler, Jeffrey D., 2016. "Weighted average of inlet and outlet temperatures in borehole heat exchangers," Applied Energy, Elsevier, vol. 174(C), pages 118-129.
    8. Aydın, Murat & Sisman, Altug, 2015. "Experimental and computational investigation of multi U-tube boreholes," Applied Energy, Elsevier, vol. 145(C), pages 163-171.
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