Large fire research facility (Building 205) exhaust hood heat release rate measurement system

Abstract

Rate of heat release is a critical parameter for evaluation of the fire properties of a material. The Large Fire Research Facility at the National Institute of Standards and Technology operates three hoods capable of determining heat release rate from oxygen consumption measurements. This report describes the methodology and apparatus used to measure heat release rate. In addition, the results from several calibration tests conducted in each hood are discussed. The heat release rates determined from hood measurements range from 120 % to approximately 60 % of the theoretical values for the natural gas calibration fires.

Instrumentation Design for HRR Measurements in a Large-Scale Fire Facility

“…Generally, an exhaust fan collects all combustion products in a large enough hood [6] and into a duct where all necessary measurements are taken in such a way that the measurements represent data from all combustion products. …”

Analysis of Heat Release Rate with Various Diameter of Heptane Pool Fire Using Large Scale Cone Calorimeter

“…그럼 에도 불구하고 국외에서는 보통 5 MW 이상의 열량을 측 정할 수 있는 LSC를 25년 전부터 개발하여 왔으며 (4) , FDS, CFAST 등과 같은 해석 모델의 결과를 검증하는 등 LSC 의 활용성은 앞으로 더욱 증가할 것으로 판단된다. 이러한 실규모급 화재에서 발열량을 산출하는 방법은 가연물의 질량 감소율을 이용한 질량 소모법(mass loss rate)이외에 엔탈피 상승법(sensible enthalpy rise method) 그리고 산소 소모법(oxygen consumption method) 등이 있다 (2)(3)(4)(5)(6)(7)(8) . 이 중에서 질량 소모법은 단일 가연물에 대해서 비교적 손쉽게 발열량을 평가할 수 있지만, 복합 물성인 † Corresponding Author, E-Mail: cfdmec@cau.ac.kr † TEL: +82-2-820-5280, FAX: +82-2-813-3669 한국화재소방학회 논문지, 제28권 제5호, 2014년 가연물의 발열량을 정량화하는데 한계가 있다.…”

Impact of sprinklers on the fire hazard in dormitories :

“…An electric match, as described in Table 2.3-5, was used to ignite the fuel package. beads [3]. The dry gas samples were then drawn through a series of gas analyzers, which were installed in the room next to "Dorm Room 2".…”

“…The gas measurement instruments and sampling system used in this series of experiments have demonstrated an expanded relative uncertainty of ± 1 % when compared with calibration span gas volume fractions [3,10]. Given the limited set of sampling points in these experiments, an estimated uncertainty of ± 10 % is applied to the results.…”