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The Flame and Distributed Temperature Restraint Properties of Fire Venetian Blind Louver in Buildings

차양식 방화루버의 화염 및 온도 전파 억제 특성

  • Received : 2014.11.07
  • Accepted : 2014.12.08
  • Published : 2015.01.30

Abstract

The purpose of this study is to improve the fire prevention performance using the fire venetian blind louver subjected to burning by fire flame. The investigation is based on testing 2 full scale specimens, which is $3m{\times}3m$ module, $850mm{\times}1,500mm$ open, and $900mm{\times}900mm{\times}175mm$ venetian blind louver. Two louver thickness (1.5 and 2.0mm) were adopted. The specimens were exposed to fire flame temperature levels of ISO834 at the lower surface of the fire venetian blind louver specimens with exposure duration of one hour in Korea Institute of Construction Technology (KICT). It was found from the test results that the values of distributed temperature, decreased for all specimens for protecting to fire flame by venetian blind louver. The results of tests were a good fire prevention performance between in initial to 6 mins. At 60 minutes around ISO 834 fire loading, the percentages of distributed temperature in 500mm and 800mm height ranged between 11 and 10% respectively, regardless of louver thickness. This study, therefore, will improve the fire venetian blind louver for fire protection and prevention performance.

이 연구는 화재시 수직화염을 적절하게 제어할 수 있는 차양식 방화루버의 실용화 및 설계기법 개발에 관한 일련의 연구로써 구조물에서 화염 억제 특성을 해석할 수 있는 기법을 제시하고 실험을 통해 해석기법의 검증과 차양식 방화루버의 성능을 검증하기 위한 것이다. 실제 방화루버의 수직화염 억제뿐만 아니라 열전달 특성을 정량적으로 분석하기 위하여 2개의 실대형 실험을 계획하였다. 실험체는 전체 $3m{\times}3m$의 시험체 중 $850mm{\times}1,800mm$의 개구부를 두고 상부에 실험용 방화루버 ($900mm{\times}900mm{\times}175mm$)를 설치하였으며, 건설기술연구원에서 ISO834 화재하중 규모로 1시간 실험을 실시하였다. 실험변수는 방화루버의 두께로 1.5mm, 2.0mm로 설정하였다. 실험결과 차양용 방화루버는 상부의 수열온도가 현저하게 감소하는 것을 확인하였다. 특히 화재하중 가력 초기에서 6분 (로내 온도 $600^{\circ}C$)에서 우수한 차열성능을 나타냈다. ISO 834 화재하중 60분에서 방화루버 상부 500mm, 800mm 위치의 수열온도는 루버 두께에 상관 없이 각각 로내 온도 대비 11, 10%로 나타났다. 이를 통해 화재발생 후 상부층으로 화염 전파 억제 및 온도 전달 제어 측면에서 차양용 방화루버는 유효한 방안 중 하나라는 것을 알 수 있었다.

Keywords

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