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2015 Vol.31, Issue 5 Preview Page
Evaluation of a Ground Heat Exchanger Appropriate for the Site of the Third Stage Construction of Incheon International Airport

인천국제공항 3단계 건설부지에 적합한 지중열교환기 시스템 평가 연구

Nam-Hyun Cho1*
,
Jung-Tae Song2
,
Seok Yoon3
,
Seung-Rae Lee4
조 남현1*
,
송 정태2
,
윤 석3
,
이 승래4
1Research Fellow, Airport Research Institute, Incheon Airport
2Director, Research Fellow, Airport Research Institute, Incheon Airport
3Post-doc, Dept. of Civil and Environmental Engineering, KAIST
4Prof., Dept. of Civil and Environmental Engineering, KAIST
1인천국제공항공사 공항연구소 전문연구원
2인천국제공항공사 공항연구소 소장
3한국과학기술원 건설환경공학과 박사후연구원
4한국과학기술원 건설환경공학과 교수
*교신저자. *Corresponding Author. 
31 May 2015. pp. 23-33
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Abstract

In the present study, a ground heat exchanger was installed for each heat source in the system at the site to evaluate ground heat conductivity, constructability, and economic feasibility; the factors considered in the study included ground heat, groundwater, fillers (such as bentonite and pea pebbles) and the shape of the heat exchange pipe (e.g., U and D-U). The aim was to determine the ground heat exchanger appropriate for the geothermal system in the 3rd-phase construction of Incheon International Airport. A comparative cost analysis of the initial costs based on the above information showed that although the initial costs of the regular vertical closed loop-II and modified vertical closed loop were lower than those of the regular vertical closed loop-I, they could not be expected to deliver high economic efficiency from the viewpoint of constructability (filler injection, heat exchange pipe insertion). The initial costs proved to be higher in the case of Geohil.

Keywords
GHE
Ground thermal conductivity
Grouting material
Vertical Closed Loop
Geohil

본 연구에서는 인천국제공항 3단계 건설 사업에 포함된 지중열시스템에 대한 적정 지중열교환기 선정을 위해 현장부지내 시스템의 열원(지중열원, 지하수), 채움재(벤토나이트, 콩자갈), 열교환 파이프 형태(U, D-U)별로 지중열교환기를 설치하여 지중열전도도, 시공성, 경제성을 평가하였다. 이를 위해 벤토나이트 그라우트에 single U형의 열교환파이프가 삽입된 일반수직밀폐형-I, 열교환 파이프의 접촉면적을 늘려 열교환율을 높이기 위해 single U형 열교환파이프를 두 개 삽입한 Double U형 일반수직밀폐형-II, 일반수직밀폐형-I의 채움재를 벤토나이트 대신 콩자갈로 적용한 개량수직밀폐형 및 SCW(standing column well)에 채움재를 넣은 함몰방지개방형(geohil)을 시험시공하였다. 초기비용에 대한 비용 비교분석결과 일반수직밀폐형-I 대비 개량수직밀폐형, 일반수직밀폐형-II의 경우 초기비용이 절감되었지만 시공성(채움재 주입, 열교환 파이프 삽입) 및 시공일수를 고려할 때 높은 경제성을 기대하기 어려우리라 판단된다. 또한 Geohil의 경우 초기 비용이 더 늘어났다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 31
  • No :5
  • Pages :23-33
  • Received Date : 2014-08-11
  • Revised Date : 2014-12-24
  • Accepted Date : 2015-05-21
  • DOI :https://doi.org/10.7843/kgs.2015.31.5.23
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