Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on Entering Water Temperature in Vertical Closed Ground Loop System Considering the Economical Feasibility in Load of the Office Building

사무시설에 수직형 지열원 냉 난방시스템의 경제성을 고려한 인입온도(EWT)에 관한 연구

  • Lee, Byung-Doo (Energy Department, Hyundai Institute of Construction Technology Development Research engineer) ;
  • Lee, Dae-Woo (Energy Department, Hyundai Institute of Construction Technology Development Research engineer) ;
  • Lee, Se-Jin (Energy Department, Hyundai Institute of Construction Technology Development Research engineer)
  • 이병두 ((주)현대건설 기술연구소 에너지부) ;
  • 이대우 ((주)현대건설 기술연구소 에너지부) ;
  • 이세진 ((주)현대건설 기술연구소 에너지부)
  • Published : 2009.06.25
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Abstract

Recently, Vertical-Closed Loop system using geothermal which is the most efficient among the building cooling and heating systems is coming into wide spread due to assistance of domestic policies. However, there is a limitation that a design of ground heat exchanger taking 60% of construction cost is done by GLD and GLHEPRO programs without specific guidelines and consideration on Entering Water Temperature(EWT). For getting an optimal EWT, we analyzed the costs for construction of ground heat exchanger and cooling and heating for 15 years. In the results, reduction of construction costs as the length of ground heat exchanger shortens was much greater than increase of the electrical power consumption as COP gets low. EWT that COP of heat pump can be 3.76 or above was below $31^{\circ}C$ in cooling and was over $5^{\circ}C$ in heating.

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