• Title/Summary/Keyword: 지열시스템

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Characterization of Area Installing Combined Geothermal Systems : Hydrogeological Properties of Aquifer (복합지열시스템에 대한 부지특성화: 대수층의 수리지질학적 특성)

  • Mok, Jong-Koo;Park, Yu-Chul;Park, Youngyun;Kim, Seung-Kyum;Oh, Jeong-Seok;Seonwoo, Eun-Mi
    • The Journal of Engineering Geology
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    • v.27 no.3
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    • pp.293-304
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    • 2017

  • This study was performed in order to hydrogeological analysis of aquifer, which is a necessary part for evaluating the efficiency of the combined well and open-closed loops geothermal (CWG) systems. CWG systems have been proposed for the effective utilization of geothermal energy by combining open loop geothermal systems and closed loop geothermal systems. Small aperture CWG systems and large aperture CWG systems were installed at a green house land with water curtain facilities in Chungju City. Aquifer tests include pumping tests and step-drawdown tests were conducted to analyse hydrogeological characteristics of aquifer in the study area. The transmissivity was estimated in the range of $13.49{\sim}58.99cm^2/sec$, and the storativity was estimated in the range of $1.13{\times}10^{-5}{\sim}5.20{\times}10^{-3}$. The geochemical analysis showed $Ca^{2+}$ ion and ${HCO_3}^-$ ion were dominant in groundwater. The Langelier Saturation Index and the Ryznar Stability Index showed low scaling potential of groundwater. In the analysis of vertical water temperature change, the geothermal gradient was estimated as $2.1^{\circ}C/100m$, which indicated the aquifer was enough for geothermal systems. In conclusion, groundwater is rich, can stably use geothermal heat, and it is less likely to cause deterioration of thermal energy efficiency by precipitation of carbonate minerals in study area. Therefore, the study area is suitable for installation of the combined geothermal system.

  • https://doi.org/10.9720/kseg.2017.3.293 인용 PDF KSCI

지열냉$\cdot$난방시스템 도입 ESCO사업 에너지절약은 물론 환경보호까지

  • 에너지절약전문기업협회
    • The Magazine for Energy Service Companies
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    • s.32
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    • pp.24-27
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    • 2005

  • 기후협약에 따른 환경과 에너지에 대한 국제적 규제의 강화는 지속가능한 에너지에 근거한 새로운 에너지전략의 수립을 요구하고 있다. 이러한 추세임을 감안할 때 ESCO를 통한 신$\cdot$재생에너지의 활용 가능성은 무궁무진해 보인다. 지열냉난방시스템은 1년 내내 $14\~16^{\circ}C$로 유지되는 땅속 온도를 에너지화하여 이용함으로써 에너지절약과 환경보호를 동시에 이룰 수 있는 무공해 청정시스템이다. 보험개발원 산하 자동차기술연구소는 지난 해 처음으로 지열시스템 도입 ESCO사업을 시행했다.

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