• Title/Summary/Keyword: 지열냉난방시스템

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사무용건물의 지열 냉난방 시스템 실증연구

  • An, Hyeong-Jun;Baek, Seong-Gwon;Jo, Jeong-Sik;Son, Byeong-Hu
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.11a
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    • pp.381-389
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    • 2005
  • 우리나라 에너지소비의 25%이상을 차지하는 건물냉난방부문의 에너지절약을 위해 에너지효율이 높은 것으로 나타난 지열냉난방시스템의 보급이 필요하다. 이에 지열냉난방시스템 실증연구를 통해 사무용건물에 지열냉난방시스템을 설계 및 적용하고 냉난방운전을 실시하였다. 실증연구 결과 지열냉난방시스템은 우리나라의 기후 및 지질조건에 매우 적합하며 냉방운전의 경우 COP가 평균 4.23$\sim$5.49, 난방운전의 경우 COP가 평균 3.32$\sim$4.44를 나타내었다. 실증연구를 통해 사무용건물의 지열냉난방시스템의 설계 및 시공능력을 확보함에 따라 향후 보급에 기여하고자 한다.

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회원사소식 - 코텍엔지니어링(주), 제2 롯데월드 지열냉난방시스템 공사 수주

  • 대한설비건설협회
    • 월간 기계설비
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    • s.242
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    • pp.14-15
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    • 2010
  • 우리나라는 건물 냉난방에 연간 250조원에 이르는 에너지를 수입하고 있다. 비용도 엄청나지만 에너지 자원의 확보도 갈수록 어려워지고 있다. 미국과 유럽에서는 2030년까지의 지열 보급계획을 수립, 국가별로 건물 냉난방에너지의 20~60%까지를 지열로 대체한다는 계획을 추진하고 있다. 우리나라도 에너지절약 의무화제도, 그린홈 100만호제도, 시설원예사업 등 다양한 정부정책을 추진하고 있다. 그러나 민간부문의 참여가 없으면 에너지절감 효과는 극히 제한적일 수 밖에 없다. 제2 롯데월드에서 지열시스템 도입한 것은 우리나라 지열시장의 수준을 한 단계 레벨업 시킬 것으로 예상된다. 본지는 코텍엔지니어링(주)가 수주한 제2 롯데월드 지열냉난방시스템 공사에 대해 알아보고, 앞으로 시공과정을 자세히 보도할 예정이다.

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Analysis of Economic Feasibility and Reductions of Carbon Dioxide Emission of Geothermal Heating and Cooling System using Groundwater (지하수를 이용한 지열 냉난방시스템의 경제성 및 이산화탄소 저감량 분석)

  • Kim, Jin-Sung;Song, Sung-Ho;Jeong, Gyo-Cheol;Cha, Jang-Hwan
    • The Journal of Engineering Geology
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    • v.25 no.4
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    • pp.599-612
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    • 2015
  • The development of renewable energy technologies that can replace fossil fuels is environmentally important; however, such technologies must be economically feasible. Economic analyses are important for assessing new projects such as geothermal heating-cooling systems, given their large initial costs. This study analyzed the economics and carbon dioxide emissions of: a SCW (standing column well), a vertical closed loop boiler, a gas boiler, and an oil boiler. Life cycle cost analysis showed that the SCW geothermal heating-cooling system had the highest economic feasibility, as it had the highest cost saving and also the lowest carbon dioxide emissions. Overall, it appears that geothermal systems can save money when applied to large-scale controlled agriculture complexes and reclaimed land.

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.

A Study on Thermal Conductivity Properties of Ground Heat Exchangers for GSHP systems (지열냉난방시스템 수직형 지중열교환기 그라우트의 열적 특성에 관한 연구)

  • Baek, Sung-Kwon;Jeon, Joong-Kyu;An, Hyung-Jun
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.429-433
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    • 2007
  • Cement mortar and concrete can be used as grouts but problems regarding shrinkage and the discord of coefficients of thermal expansion between grouts and HDPE pipes has to be solved. Thermal conductivities of wet condition two times larger than those of dry condition, except for pure cement mortar. The addition of sand into the cement grouts greatly increases the thermal conductivity. The addition of bentonite into the cement grouts reduces thermal conductivity thus reducing the density. Bentonite grouting must be used only below the groundwater table since bentonite grouts possesses high shrinkage property in dry condition. The addition of sand prevents the shrinkage of bentonite grouts. Bentonite manufactured in Korea can be used since they possess similar thermal conductivities with imported products. The addition of sand into the bentonite grouts greatly increases the thermal conductivity.

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