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Design and Performance Evaluation of a Heat Pump System Utilizing a Permanent Dewatering System

Author

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  • Seung-Hoon Park

    (Department of Architectural Engineering, INHA University, Inha-ro 100, Michuhol-gu, Incheon 22212, Korea)

  • Yong-Sung Jang

    (GS E&C Research Institute, Baegok-daero 388, Cheoin-gu, Youngin, Gyeonggi-do 17130, Korea)

  • Eui-Jong Kim

    (Department of Architectural Engineering, INHA University, Inha-ro 100, Michuhol-gu, Incheon 22212, Korea)

Abstract

The earth provides a vast resource of groundwater from aquifers a few meters beneath the surface. Thus, buildings that use underground space must be equipped with dewatering wells to drain the permeated groundwater to the sewage pipelines to ensure the structural stability of the building. Although the inflowing groundwater temperatures and flow rates are stable enough for groundwater to be used as an energy source, 79% of the permeated groundwater is discarded through the sewers, generating significant sewerage expenses. This study introduced a novel heat exchanger module to utilize the permeated groundwater as an unused energy source using heat pumps, and the performance of the system was evaluated by TRNSYS simulations. First, the sizing of the unit heat exchanger module was proposed according to the mean inflow rate of the permeated groundwater. Second, the heat pump system was configured using multiple modules in the source-side loop. Finally, the performance of the proposed heat pump system was compared with that of a conventional air source heat pump using realistic load and temperature profiles. This preliminary study demonstrated interesting performance results, with a coefficient of performance for heating that was higher than that of a conventional heat pump system by 0.79. The results show the potential utilization of the systems for a construction project requiring large-scale underground spaces, where abundant groundwater is available.

Suggested Citation

  • Seung-Hoon Park & Yong-Sung Jang & Eui-Jong Kim, 2021. "Design and Performance Evaluation of a Heat Pump System Utilizing a Permanent Dewatering System," Energies, MDPI, vol. 14(8), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2273-:d:538463
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    References listed on IDEAS

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    1. Wang, Guiling & Wang, Wanli & Luo, Jin & Zhang, Yuhao, 2019. "Assessment of three types of shallow geothermal resources and ground-source heat-pump applications in provincial capitals in the Yangtze River Basin, China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 111(C), pages 392-421.
    2. Zhou, Xuezhi & Gao, Qing & Chen, Xiangliang & Yu, Ming & Zhao, Xiaowen, 2013. "Numerically simulating the thermal behaviors in groundwater wells of groundwater heat pump," Energy, Elsevier, vol. 61(C), pages 240-247.
    3. Shen, Chao & Jiang, Yiqiang & Yao, Yang & Wang, Xinlei, 2012. "An experimental comparison of two heat exchangers used in wastewater source heat pump: A novel dry-expansion shell-and-tube evaporator versus a conventional immersed evaporator," Energy, Elsevier, vol. 47(1), pages 600-608.
    4. Ferguson, Grant, 2012. "Characterizing uncertainty in groundwater-source heating and cooling projects in Manitoba, Canada," Energy, Elsevier, vol. 37(1), pages 201-206.
    5. Seung-Hoon Park & Eui-Jong Kim, 2019. "Optimal Sizing of Irregularly Arranged Boreholes Using Duct-Storage Model," Sustainability, MDPI, vol. 11(16), pages 1-18, August.
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    Cited by:

    1. Jordi García-Céspedes & Ignasi Herms & Georgina Arnó & José Juan de Felipe, 2022. "Fifth-Generation District Heating and Cooling Networks Based on Shallow Geothermal Energy: A review and Possible Solutions for Mediterranean Europe," Energies, MDPI, vol. 16(1), pages 1-31, December.

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