Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on Performance Evaluation of a Vertically Closed Deep Geothermal Circulation Simulator

수직 밀폐형 심부지열 순환 시뮬레이터의 성능 평가에 관한 연구

  • 배정형 (조선대학교 기계공학과) ;
  • 이동운 (조선대학교 기계공학과) ;
  • 윤충만 (조선대학교 기계공학과) ;
  • 류연수 (한국농어촌공사 농어촌연구원) ;
  • 정상화 (조선대학교 기계공학과)
  • Received : 2016.07.13
  • Accepted : 2016.07.29
  • Published : 2016.10.31
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Abstract

While greenhouses have been utilized as a sustainable alternative to traditional soil farming, they are often powered by diesel boilers that necessitate vast amounts of non-renewable energy and emit toxic fumes. Thus, geothermal heat pumps have been proposed as a more energy-efficient substitution for diesel boilers. Currently, most horticultural facilities in the United States use shallow geothermal systems, and are often equipped with horizontal underground heat exchangers as well as heat pump equipment. These shallow geothermal systems require a large drilling site and heat pump to function, which results in high maintenance costs. The heat pump itself consumes a large amount of power, which degrades system performance. Conversely, high temperatures can be attained within a single borehole in deep geothermal vertical closing systems without using a heat pump. This setup can dramatically reduce the power consumption and improve system performance. In this study, we have modeled a circulation simulator after the circulation systems in deep geothermal facilities to analyze a 2000-meter borehole in Naju-Sanpo-myeon. The simulator is operated by manipulating various putative parameters affecting system performance to analyze the system's coefficient of performance.

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References

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