Effects of External Heat Radiation on Combustion and Toxic Gas Release of Flame Retardant Cables

2017 ◽  
Vol 898 ◽  
pp. 2392-2398 ◽  
Author(s):  
Jia Qing Zhang ◽  
Bo Si Zhang ◽  
Ming Hao Fan ◽  
Liu Fang Wang ◽  
Xiang Jun Guo ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flame Retardant ◽  
Release Rate ◽  
External Heat ◽  
Heat Radiation ◽  
Gas Release ◽  
External Radiation ◽  
Radiation Heat ◽  
Radiation Heat Flux ◽  
Co Concentration

The effects of external heat radiation on combustion and toxic gas release characteristics of flame retardant cables, which were XLPE insulated, flame retardant PVC sheathed and steel armoured cables, were investigated. The combustion characteristics of the level A and the level C flame retardant cables were explored by the cone calorimeter. For the level C cables, heat release rate (HRR) and CO concentration in cable fires increased and the ignition time decreased with increase of the external radiation heat flux. For level A cables, the HRR and CO concentration showed two-stage variations with the external radiation heat flux. When the external radiation heat flux was smaller than 35 kW/m2, the cable self-extinguished quickly after the ignition. When the external radiation heat flux was larger than 50 kW/m2, the cables showed continuous burning phenomena after the ignition. The level A cable had smaller HRRs compared with that of the level C cable under the same external radiation heat flux. However, the CO concentration of level A cable was remarkably higher than that of the level C cable in the present study. The high CO release rate of cable with well flame retardant ability under large external radiation heat flux requires more caution in the cable fires.

The Experimental Study and Simplified Model of Water Mist Absorbing Heat Radiation

2014 ◽  
Vol 1008-1009 ◽  
pp. 886-891
Author(s):  
Chun Yi Lu ◽  
Yong Gang Yu
Keyword(s):  
Heat Flux ◽  
Particle Diameter ◽  
Water Mist ◽  
Heat Radiation ◽  
Simplified Model ◽  
Small Scale ◽  
Radiation Heat ◽  
Radiation Heat Flux ◽  
Variation Characteristics ◽  
Field Radiation

The small-scale experiments of water mist extinguishing cardboard fire were carried out. Thermocouples and heat radiation sensor were used to measure the fire temperature and radiation heat flux of the burning area. The variation characteristics of the combustion field radiation heat flux under different spray pressure were studied. The results show that: the spray pressure has a significant influence on the extinguishing process. Based on the experiments, The simplified model of water mist absorbing heat radiation has been established, the results of this model agree well with the results of the experiments, and is good for predicting the effect of water mist particle diameter.

Effects of external radiation heat flux on combustion characteristics of pure and oil-impregnated transformer insulating paperboard

2017 ◽  
Vol 37 (3) ◽  
pp. 362-368 ◽  
Author(s):  
Jiaqing Zhang ◽  
Bosi Zhang ◽  
Minghao Fan ◽  
Liufang Wang ◽  
Guocheng Ding ◽  
...  
Keyword(s):  
Heat Flux ◽  
Combustion Characteristics ◽  
External Radiation ◽  
Radiation Heat ◽  
Radiation Heat Flux

Combustion Performance of Composite Floor with Different Radiant Heat Flux

2014 ◽  
Vol 501-504 ◽  
pp. 2415-2418
Author(s):  
Yan Ying Xu ◽  
Ruo Jun Wang ◽  
Jian Chen ◽  
Lu Chao Li
Keyword(s):  
Heat Flux ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Ignition Time ◽  
Radiation Heat ◽  
Radiation Heat Flux ◽  
Combustion Performance ◽  
Wood Flooring ◽  
Engineered Wood

The combustion performance of engineered wood flooring and intensive composite floor under the different radiation heat flux were experimented by cone calorimeter. Fire parameters were measured including the ignition time and heat release rate. Experimental results show that the ignition time of engineered wood flooring is much lower than intensive composite floor, and the ignition time are decreased with the increase of radiation heat flux. The heat release rate (HRR) curve has two peaks under the same radiation heat flux, and the first peak of the heat release rate of engineered wood flooring occurs significantly earlier than intensive composite floor. The heat release rate is increased and the first peak significantly ahead of time with the increase of the radiation intensity

Absorbed Radiation Heat Flux Sensors for Orbital Spacecraft. Algorithms for Measurement Data Processing

2021 ◽  
Vol 30 (3) ◽  
pp. 383-403
Author(s):  
A. V. Nenarokomov ◽  
D. L. Reviznikov ◽  
D. A. Neverova ◽  
E. V. Chebakov ◽  
A. V. Morzhukhina ◽  
...  
Keyword(s):  
Heat Flux ◽  
Data Processing ◽  
Measurement Data ◽  
Radiation Heat ◽  
Radiation Heat Flux ◽  
Heat Flux Sensors ◽  
Orbital Spacecraft

Radiation and Convection Heat Transfer in a Porous Bed

1968 ◽  
Vol 90 (1) ◽  
pp. 51-54 ◽  
Author(s):  
W. A. Beckman
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Collection Efficiency ◽  
Convection Heat Transfer ◽  
Heat Fluxes ◽  
Fluid Temperature ◽  
Radiation Heat ◽  
Radiation Heat Flux ◽  
Flowing Fluid ◽  
Porous Bed

The one-dimensional steady-state temperature distribution within an isotropic porous bed subjected to a collimated and/or diffuse radiation heat flux and a transparent flowing fluid has been determined by numerical methods. The porous bed was assumed to be nonscattering and to have a constant absorption coefficient. Part of the radiation absorbed by the porous bed is reradiated and the remainder is transferred to the fluid by convection. Due to the assumed finite volumetric heat transfer coefficient, the bed and fluid have different temperatures. A bed with an optical depth of six and with a normal incident collimated radiation heat flux was investigated in detail. The radiation incident on the bed at the fluid exit was assumed to originate from a black surface at the fluid exit temperature. The investigation covered the range of incident diffuse and collimated radiation heat fluxes expected in a nonconcentrating solar energy collector. The results are presented in terms of a bed collection efficiency from which the fluid temperature rise can be calculated.

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