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Thermal Impact by Open-Loop Geothermal Heat Pump Systems in Two Different Local Underground Conditions on the Alluvial Fan of the Nagara River, Gifu City, Central Japan

Author

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  • Randa Permanda

    (Department of Engineering, Graduate School of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan)

  • Tomoyuki Ohtani

    (Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan)

Abstract

An alluvial fan is a good area to install open-loop geothermal heat pump (GHP) systems due to shallower aquifers, faster groundwater flow, and fewer land subsidence risks. The natural temperature change in groundwater occurs in alluvial fans due to the recharge of river water and faster groundwater flow, and the thermal impact of the open-loop system has not been studied well in such areas. The purpose of this research is to understand the thermal impact of open-loop GHP systems on an alluvial fan. A regional 3D model of groundwater flow with heat transport was created to determine the distribution of flow velocity and temperature of groundwater. After that, two local models with different groundwater velocities were constructed to demonstrate the thermal impact of an open-loop GHP system using one extraction and one injection well. The results indicated that the local model with faster groundwater flow had a smaller thermal impact. The natural temperature change in groundwater causes groundwater temperature to be lower in the summer and higher in winter during the operation in the local model, with faster groundwater flow.

Suggested Citation

  • Randa Permanda & Tomoyuki Ohtani, 2022. "Thermal Impact by Open-Loop Geothermal Heat Pump Systems in Two Different Local Underground Conditions on the Alluvial Fan of the Nagara River, Gifu City, Central Japan," Energies, MDPI, vol. 15(18), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:18:p:6816-:d:918004
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    References listed on IDEAS

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    1. Blum, Philipp & Campillo, Gisela & Münch, Wolfram & Kölbel, Thomas, 2010. "CO2 savings of ground source heat pump systems – A regional analysis," Renewable Energy, Elsevier, vol. 35(1), pages 122-127.
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    3. Bruno Piga & Alessandro Casasso & Francesca Pace & Alberto Godio & Rajandrea Sethi, 2017. "Thermal Impact Assessment of Groundwater Heat Pumps (GWHPs): Rigorous vs. Simplified Models," Energies, MDPI, vol. 10(9), pages 1-19, September.
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    1. Taha Sezer & Abubakar Kawuwa Sani & Rao Martand Singh & Liang Cui, 2023. "Laboratory Investigation of Impact of Injection–Abstraction Rate and Groundwater Flow Velocity on Groundwater Heat Pump Performance," Energies, MDPI, vol. 16(19), pages 1-19, October.
    2. Davide Cappellari & Leonardo Piccinini & Alessandro Pontin & Paolo Fabbri, 2022. "Sustainability of an Open-Loop GWHP System in an Italian Alpine Valley," Sustainability, MDPI, vol. 15(1), pages 1-28, December.

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