• Title/Summary/Keyword: 지열냉난방 시스템

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Numerical Simulations for Optimal Utilization of Geothermal Energy under Groundwater-bearing Conditions (지하수 부존지역에서 최적 지열에너지 활용방식 수치 모의)

  • Kim, Jin-Sung;Cha, Jang-Hwan;Song, Sung-Ho;Jeong, Gyo-Cheol
    • The Journal of Engineering Geology
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    • v.24 no.4
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    • pp.487-499
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    • 2014

  • While the vertical open type of heat exchanger is more effective in areas of abundant groundwater, and is becoming more widely used, the heat exchanger most commonly used in geothermal heating and cooling systems in Korea is the vertical closed loop type. In this study, we performed numerical simulations of the optimal utilization of geothermal energy based on the hydrogeological and thermal properties to evaluate the efficiency of the vertical open type in areas of abundant groundwater supply. The first simulation indicated that the vertical open type using groundwater directly is more efficient than the vertical closed loop type in areas of abundant groundwater. Furthermore, a doublet system with separated injection and extraction wells was more efficient because the temperature difference (${\Delta}$) between the injection and extraction water generated by heat exchange with the ground is large. In the second simulation, we performed additional numerical simulations of the optimal utilization of geothermal energy that incorporated heat transfer, distance, flow rate, and groundwater hydraulic gradient targeting a single well, SCW (standing column well), and doublet. We present a flow diagram that can be used to select the optimal type of heat exchanger based on these simulation results. The results of this study indicate that it is necessary to examine the adequacy of the geothermal energy utilization system based on the hydrogeological and thermal properties of the area concerned, and also on a review of the COP (coefficient of performance) of the geothermal heating and cooling system.

  • https://doi.org/10.9720/kseg.2014.4.487 인용 PDF KSCI KPUBS HTML

A Study on Application of Geothermal Heatpump System for Apartments (공동주택용 지열냉난방 적용성 검토 연구)

  • Baek, Sung-Kwon;Ahn, Hyung-Jun;Lee, Dong-Cheul;Im, Seung-Kyun
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.574-578
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    • 2009

  • Residential is the biggest market for geothermal heatpump systems in the world. However It could not be considered as a big market in Korea. Serious problems are hidden. In this paper, I will discuss about with other problems that we must solve.

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