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A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model

Author

Listed:
  • Takao Katsura

    (Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan)

  • Takashi Higashitani

    (Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan)

  • Yuzhi Fang

    (Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan)

  • Yoshitaka Sakata

    (Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan)

  • Katsunori Nagano

    (Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan)

  • Hitoshi Akai

    (Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, Japan
    Faculty of Symbiotic Systems Science, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan)

  • Motoaki OE

    (INOAC Housing & Construction Materials Co., Ltd., 4-9-27 Taihou, Atsuta-ku, Nagoya 456-0062, Japan)

Abstract

Considering the heat capacity inside vertical spiral ground heat exchanger (VSGHEX) in the simulation is one of the most noteworthy challenge to design the ground source heat pump (GSHP) system with VSGHEXs. In this paper, a new simulation model for VSGHEXs is developed by combining the ICS model with the CaRM. The developed simulation model can consider the heat capacity inside VSGHEX and provide dynamic calculation with high speed and appropriate precision. In order to apply the CaRM, the equivalent length was introduced. Then, the equivalent length was approximated by comparing the results of the CaRM and the numerical calculation. In addition, the calculation model of the VSGHEX was integrated into the design and simulation tool for the GSHP system. The accuracy of the tool was verified by comparing with the measurements. The error between supply temperatures of the measurements and calculation is approximately 2 °C at the maximum. Finally, assuming GSHP systems with VSGHEXs, whose spiral diameter was 500 mm and depth was 4 m, were installed in residential houses in Japan, the required numbers of VSGHEXs were estimated. The results showed a strong correlation between the total heating or cooling load and the required number. Therefore, the required number can be estimated by using the simplified approximate equation.

Suggested Citation

  • Takao Katsura & Takashi Higashitani & Yuzhi Fang & Yoshitaka Sakata & Katsunori Nagano & Hitoshi Akai & Motoaki OE, 2020. "A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model," Energies, MDPI, vol. 13(6), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1339-:d:332204
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    References listed on IDEAS

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    1. Li, Min & Lai, Alvin C.K., 2012. "Heat-source solutions to heat conduction in anisotropic media with application to pile and borehole ground heat exchangers," Applied Energy, Elsevier, vol. 96(C), pages 451-458.
    2. Go, Gyu-Hyun & Lee, Seung-Rae & Yoon, Seok & Kang, Han-byul, 2014. "Design of spiral coil PHC energy pile considering effective borehole thermal resistance and groundwater advection effects," Applied Energy, Elsevier, vol. 125(C), pages 165-178.
    3. Zarrella, Angelo & De Carli, Michele, 2013. "Heat transfer analysis of short helical borehole heat exchangers," Applied Energy, Elsevier, vol. 102(C), pages 1477-1491.
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    Cited by:

    1. Joanna Piotrowska-Woroniak, 2021. "Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)," Energies, MDPI, vol. 14(16), pages 1-32, August.
    2. Takao Katsura & Yoshitaka Sakata & Lan Ding & Katsunori Nagano, 2020. "Development of Simulation Tool for Ground Source Heat Pump Systems Influenced by Ground Surface," Energies, MDPI, vol. 13(17), pages 1-18, August.
    3. Joanna Piotrowska-Woroniak, 2021. "Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests," Energies, MDPI, vol. 14(9), pages 1-21, April.

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