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2025 Vol.27, Issue 6 Preview Page

Research Paper

Optimization of ventilation control devices for securing response time against condensation in utility tunnels

공동구 결로 대응 시간 확보를 위한 환기 제어장치 최적화 연구

Suk-Min Kong1
,
Yoseph Byun2
,
Gi-Jun Lee2
,
Sang-Il Choi3
,
Seong-Won Lee4*
공 석민1
,
변 요셉2
,
이 기준2
,
최 상일3
,
이 성원4*
1Post-Doctoral Researcher, Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
2Senior Researcher, Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
3Assistant Professor, School of Computer Software, Daegu Catholic University
4Senior Research Fellow, Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
1정회원, 한국건설기술연구원 지반연구본부 박사후연구원
2정회원, 한국건설기술연구원 지반연구본부 수석연구원
3정회원, 대구가톨릭대학교 컴퓨터소프트웨어학부 조교수
4정회원, 한국건설기술연구원 지반연구본부 선임연구위원
*Corresponding Author
30 November 2025. pp. 577-590
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Abstract

A utility tunnel is an underground facility that accommodates major infrastructure such as power, telecommunications, and water supply in one place. This enables the rational use of urban space, facilitates maintenance and management of facilities, and helps improve cost efficiency by preventing redundant investments. However, poor management of utility tunnels can cause greater damage than conventional single-purpose ducts. Typical accidents include fire, flooding, and intrusion, but in Korea, many utility tunnel operators consider condensation to be the most serious issue. Condensation is a primary cause of monitoring sensor failures, which in turn can trigger various large-scale accidents such as fire, flooding, and intrusion. In this study, the dry-bulb temperature at which condensation does not occur by ensuring the internal surface temperature of the utility tunnel remains higher than the dew point temperature was calculated in reverse using existing literature and theoretical equations. Computational fluid dynamics (CFD) simulations were conducted to analyze scenarios in which the inflow of hot external air causes the internal conditions of the utility tunnel to shift toward the dry-bulb temperature at which condensation occurs. In addition, the location and airflow rate of ventilation fans were considered as variables to explore optimal strategies for securing response time against condensation. Therefore, the results of this study are expected to provide useful insights for condensation management in the design and operation of utility tunnels.

Keywords
Utility tunnel
Condensation
Computational fluid dynamics
Dew point temperature
Ventilation fans

공동구는 전력, 통신, 수도 등 주요 시설물을 한곳에 수용하는 지하 시설이다. 이를 통해 도시 공간을 합리적으로 활용하고, 시설의 보수 및 관리를 용이하게 하며, 일부 중복 투자를 방지하여 경제성 향상에 도움을 준다. 하지만 체계적이지 못한 공동구 관리는 기존 개별 단독구 보다 더 큰 피해를 가져올 우려도 있다. 공동구에서 대표적인 사고는 화재, 침수, 침입 등이 있으나 국내 공동구를 운영하는 많은 관리자들은 결로 현상을 가장 큰 문제로 생각한다. 결로는 각종 모니터링 센서 고장의 원인이며, 이로 인해 화재, 침수, 침입 등 다양한 대형 사고를 감지 못하는 결과를 초래할 수 있다. 본 연구는 결로에 대한 기존 문헌과 이론식을 통해 건구온도를 역으로 계산하여 공동구 내부에 결로가 발생하지 않는 조건(표면온도 > 노점온도)을 도출하였다. 도출된 건구온도를 바탕으로 전산유체역학(computational fluid dynamics, CFD) 해석을 실시하여 환기구의 높이에 따른 결로 발생까지의 시간을 비교·분석하였다. 또한 환기팬의 위치와 풍량을 변수로 하여 결로 대응 시간을 확보하기 위한 최적 방안을 연구하였다. 따라서 본 결과를 활용한다면, 공동구 설계와 운영 시 결로 발생 상황 대응에 도움을 줄 것으로 기대된다.

키워드
공동구
결로
전산유체역학
노점온도
환기팬
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 27
  • No :6
  • Pages :577-590
  • Received Date : 2025-10-14
  • Revised Date : 2025-10-28
  • Accepted Date : 2025-10-28
  • DOI :https://doi.org/10.9711/KTAJ.2025.27.6.577
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