- Author
-
Handa, T.
|
Fukaya, H.
|
Sugawa, O.
|
Kaneko, K.
|
Hamada, T.
|
Furukawa, Y.
|
Endo, K.
- Title
- Performance Characteristics of Detectors to Fire Products Through Corridors and Compartments.
- Coporate
- Science Univ. of Tokyo, Japan
Nohmi Bosai Kogyo Co., Ltd., Tokyo, Japan
- Journal
-
Bulletin of Japanese Association of Fire Science and Engineering,
Vol. 28,
No. 2,
11-18,
July 1978
- Report
-
CIB W14/79/29 (J),
- Keywords
-
detectors
|
large scale fire tests
|
compartment fires
|
corridors
- Abstract
- [ABSTRACT IN ENGLISH] The function time and performance pattern of various types of detectors (e.g. ionization smoke detector, rate-of-rise detector, heat detector, gas detector etc.) was pursued individually in full scale corridor and compartment vs. the flow of fire-products evolved from the miscellaneous fire source (i.e. paper, wool, wood and their mixture including some amount of plastics). Each detector worked correctly when the stratification of the fire-products flow was developed. Breaking point was obtained in the output-time curve of each detector corresponding to the time of the successive and itinerant stratification of the flow through the corridor and in the compartment, respectively. These points defined as each detector's correct function-time and were exactly corresponded with the breaking points in the burning rate-time curves of miscellaneous fire source on reduced time base using time parameter. Following results were obtained: (1) Gas and smoke which were included in the flow head were found to be the ones drifitng around the fire source which had been produced during the very earlier stage of the combustion; (2) The value [equation] and [equation] was individually retained for those in the head and core of the flow of fire-products on real time bases; (3) The gas and smoke detector indicated a quicker response than the heat detector when placed on the same position far from the flaming fire source. However, they worked simultaneously when placed near the flaming fire source; (4) Breaking point-time in the correlation plots of gas output voltage vs. smoke optical density of the two-element detector which were obtained itinerantly through the corridor and in the compartment were found to be coincident with the breaking point-time in the Rb-time curve on reduced time basis, where Rb was the rate of burning; (5) The aforementioned breaking point time was also concident with time when the stratification of the flow was established; (6) Pre-alarm level (optical smoke density, output voltage of gas detector) and alarm level were preferably obtained from the statistical analysis of the working level of the respective detectors with miscelaneous fire source through the corridor and in the compartment. And the alarm-level of the smoke detector was recognized to be identified to the authorized fire-level of smoke-detector in Japan.