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An experimental study on thermal performance evaluation and effectiveness of geothermal heat exchange system in various standing column well types

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  • Lim, Myungkwan
  • Lee, Changhee

Abstract

The technology proposed in this study aims to improve the performance characteristics and coefficient of performance (COP) of a geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger composed of bleed discharge water that utilizes two balancing wells using cross-mixing methods. The results of the cooling and heating operations of the existing standing column well (SCW) and the balancing well cross-combined heat exchange systems show that the measured COP increases by 23% during the cooling operation and 12% during the heating operation. When operating with a balanced well-cross-mixed heat exchange system, the initial temperature of the underground is constant with a small standard deviation of 0.08–0.12 °C. The results of the measured values using this technology show that, if the operational method is changed from the ordinary SCW-type heat exchange system to a balanced well-intersected heat exchange system, the COP of the cooling and the heating system using geothermal heat not only improves but also ensures a stable supply of geothermal sources by maintaining a constant initial temperature. This finding is useful to fundamentally eliminate the ultimately wasted bleed water.

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  • Lim, Myungkwan & Lee, Changhee, 2021. "An experimental study on thermal performance evaluation and effectiveness of geothermal heat exchange system in various standing column well types," Renewable Energy, Elsevier, vol. 179(C), pages 1049-1064.
    • Handle: RePEc:eee:renene:v:179:y:2021:i:c:p:1049-1064
    DOI: 10.1016/j.renene.2021.07.060
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    References listed on IDEAS

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    1. Gustafsson, A.-M. & Westerlund, L., 2010. "Multi-injection rate thermal response test in groundwater filled borehole heat exchanger," Renewable Energy, Elsevier, vol. 35(5), pages 1061-1070.
    2. Marcotte, D. & Pasquier, P., 2008. "On the estimation of thermal resistance in borehole thermal conductivity test," Renewable Energy, Elsevier, vol. 33(11), pages 2407-2415.
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