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Prediction Based Design of Fire Detection for Buildings with Ceiling Heights between 9m and 18mThe purpose of this paper is to provide the experimental and theoretical background necessary to extend guidelines to ceiling heights between 9 m and 18 m. Based on the results of experiments conducted in 15 m and 22 m high hangars, detector activation thresholds and detector spacing are analyzed for both smoke and heat detectors. Only ceiling mounted detection devices are analyzed in this paper. In addition to the detector threshold study, the predictive capabilities of computer fire model simulations were compared with experimental results. This comparison, which is based on 12 fire tests, resulted in the development of a new ceiling jet algorithm to model phenomena which had not been included in previous algorithms. The improved algorithm provides a better representation of the development of the ceiling jet temperature to a growing hot layer and a better estimation of plume centerline temperature. Guidelines are examined, based on the experimental results, for fire detector spacing, placement, and sensitivity. Recommendations concerning the use of computer fire models at these heights are made as a function of fire size and hot layer development. The role of draft curtains is discussed and their impact on detector activation is demonstrated.
Document ID
19990047928
Acquisition Source
Headquarters
Document Type
Other
Authors
Davis, W. D.
(National Inst. of Standards and Technology Gaithersburg, MD United States)
Notarianni, K. A.
(National Inst. of Standards and Technology Gaithersburg, MD United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1998
Subject Category
Engineering (General)
Report/Patent Number
PB98-148158
NISTIR-6199
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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