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An Experiment on Heat Recovery Performance Improvements in Well-Water Heat-Pump Systems for a Traditional Japanese House

Author

Listed:
  • Chiemi Iba

    (Graduate School of Engineering, Kyoto University, Kyoto 6158540, Japan)

  • Shun Takano

    (Graduate School of Engineering, Kyoto University, Kyoto 6158540, Japan)

  • Shuichi Hokoi

    (Architecture Internationalization Demonstration School, Southeast University, Nanjing 210096, China)

Abstract

Concerns about resource depletion have prompted several countries to promote the usage of renewable energy, such as underground heat. In Japan, underground heat-pump technology has begun to be utilized in large-scale office buildings; however, several economic problems are observed to still exist, such as high initial costs that include drilling requirements. Further, most of the traditional dwellings “Kyo-machiya” in Kyoto, Japan have a shallow well. This study intends to propose an effective ground-source heat-pump system using the well water from a “Kyo-machiya” home that does not contain any drilling works. In previous research, it was depicted that the well-water temperature decreases as the heat pump (HP) is operated and that the heat extraction efficiency steadily becomes lower. In this study, an experiment is conducted to improve efficiency using a drainage pump. Based on the experimental results, the effect of efficiency improvement and the increase in the electric power consumption of the drainage pump are examined. It is indicated that short-time drainage could help to improve efficiency without consuming excessive energy. Thus, continuous use of the heat pump becomes possible.

Suggested Citation

  • Chiemi Iba & Shun Takano & Shuichi Hokoi, 2018. "An Experiment on Heat Recovery Performance Improvements in Well-Water Heat-Pump Systems for a Traditional Japanese House," Energies, MDPI, vol. 11(5), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1023-:d:142780
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    References listed on IDEAS

    as
    1. Tarnawski, V.R. & Leong, W.H. & Momose, T. & Hamada, Y., 2009. "Analysis of ground source heat pumps with horizontal ground heat exchangers for northern Japan," Renewable Energy, Elsevier, vol. 34(1), pages 127-134.
    2. Alberti, Luca & Antelmi, Matteo & Angelotti, Adriana & Formentin, Giovanni, 2018. "Geothermal heat pumps for sustainable farm climatization and field irrigation," Agricultural Water Management, Elsevier, vol. 195(C), pages 187-200.
    Full references (including those not matched with items on IDEAS)

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    Cited by:

    1. Soltani, M. & Moradi Kashkooli, Farshad & Souri, Mohammad & Rafiei, Behnam & Jabarifar, Mohammad & Gharali, Kobra & Nathwani, Jatin S., 2021. "Environmental, economic, and social impacts of geothermal energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 140(C).
    2. Chiemi Iba & Shuichi Hokoi, 2022. "Traditional Town Houses in Kyoto, Japan: Present and Future," Energies, MDPI, vol. 15(5), pages 1-19, March.
    3. Yoshitaka Sakata & Yuma Akeyama & Takao Katsura & Katsunori Nagano, 2023. "Evaluating Long-Term Performance of a Residential Ground-Source Heat Pump System under Climate Change in Cold and Warm Cities of Japan," Energies, MDPI, vol. 16(6), pages 1-16, March.
    4. Tsagarakis, Konstantinos P., 2020. "Shallow geothermal energy under the microscope: Social, economic, and institutional aspects," Renewable Energy, Elsevier, vol. 147(P2), pages 2801-2808.

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