An improved model for estimating heat release rate in horizontal cable tray fires in open space

Huang, Xianjia; He, Zhu; Peng, Lan; Zheng, Zihui; Zeng, Wuyong; Cheng, C.S. Agnes; Chow, Wan Ki

doi:10.1177/0734904118769810

Cited by 16 publications

(8 citation statements)

References 11 publications

(15 reference statements)

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“…The average values of the highest temperature of the two-cores, three-cores, and four-cores cables are calculated and the results are 554.8 • C, 548 • C, 555.2 • C, respectively. This is different from the results of Huang et al [2,36], who found that the average value of highest temperature rises as the number of cores increases. The difference in results could be attributed to the difference in experimental conditions.…”

Section: Temperature Distributioncontrasting

confidence: 98%

Experimental Study on Flammability and Flame Spread Characteristics of Polyvinyl Chloride (PVC) Cable

Tang

Liang

et al. 2020

Polymers

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Polyvinyl chloride (PVC) is widely applied in cables as insulation materials, which are vital for operation and control of industrial processes. However, PVC cables fires frequently occur, arousing public concern. Therefore, experimental methods are used to study flammability and flame-spread characteristics of PVC cable in this paper. Influences of cable structure and number are investigated, which is scanty in previous works. As cable core number of single cable or cable number of multiple cables rises, average flame height and width increase while the increment decreases. Formulas concerning dimensionless flame height and single cable diameter (or total width of multiple cables) are obtained. The former is negatively correlated with the latter. For single cable, convective heat transfer is dominant, and flame-spread rate decreases as cable core number increases. Cable maximum temperature, which drops first and then rises as cable core number increases, is observed in the cable core area. For multiple cable, the flame-spread rate increases as cable number increases. As the cable number rises, the length of pyrolysis and combustion zone increases while the maximum temperature of cable surface decreases. This work is beneficial to fire hazard evaluation and safety design of PVC cables.

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Section: Temperature Distributioncontrasting

confidence: 98%

Experimental Study on Flammability and Flame Spread Characteristics of Polyvinyl Chloride (PVC) Cable

Tang

Liang

et al. 2020

Polymers

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“…Another fitting parameter is the width of the burning material that can be considered as the product of the cable diameter and the number of cables (Huang et al 20 ) or that can be taken as the width of the tray and can be doubled to incorporate the burning of the two sides (upper and lower) of the tray (Zavaleta et al 14 ).…”

Section: Recall Of the Modelmentioning

confidence: 99%

Experimental investigation of the effects of a sidewall and cable arrangement on a horizontal cable tray fire in an open atmosphere

2022

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The work deals with the influence of a sidewall and cable arrangement on the behavior of a fire involving horizontal cable trays in the framework of fire safety assessments in nuclear installations. The analysis is based on large‐scale fire tests performed in the open atmosphere in the frame of the OECD Nuclear Energy Agency (NEA) PRISME 3 project and on the corresponding simulations applying the FLASHCAT model for predicting the fire heat release rate. The fire configuration consists of five horizontal trays filled with PVC‐insulated power cables. The parameters investigated are the presence or absence of a sidewall and the cable arrangement (loose or tight bundles). The results show that the presence of a sidewall increases the fire HRR in comparison to a scenario without a sidewall. This effect is due to the increase of the flame spread velocity on the lower trays. Regarding cable arrangement, a tight configuration in bundles reduces the fire HRR in comparison to a scenario with a loose arrangement. This result is due to the reduction of the fire heat release rate per unit of area (HRRPUA) as well as the flame spread velocity. The performance of the FLASHCAT model in predicting the effects of the sidewall and the cable arrangement was also assessed on the basis of the fire tests and satisfactory agreements are reported. The presented analysis demonstrates that the fire scenario with horizontal cable trays against a sidewall and with a loose cable arrangement represents a conservative scenario for fire risk assessment. In addition, on the basis of these experiments, the effect of cable arrangement is more substantial than the sidewall effect.

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“…There have been some valuable studies focusing on the fire behaviors of multiple-layer cable tray in open space. 4–11 The Fire Performance of Electric Cables project involved both experiments and numerical modeling approved by DG XII of the European Commission (Research and Development). 4,5 The links between different scales of cable fire experiments were studied.…”

Section: Introductionmentioning

confidence: 99%

“…6 Its primary aim is to provide data for the development of fire models that can predict the heat release rate (HRR) of a cable fire. Based on the cable fire experiments with vertical stacks of trays with one to three layers of cables and the cable tray fire experiments with data available in the literature, Huang et al 7 developed an improved Flame Spread over Horizontal Cable Trays model to estimate the HRR of large-scale cable fires using bench-scale measured data. The propagation d’un incendie pour des scénarios multi-locaux élémentaires (PRISME) project 8 carried out fire experiments in confined and mechanically ventilated compartments representative of fire scenarios in the nuclear industry.…”

Section: Introductionmentioning

confidence: 99%

Compartment temperature estimation of a multiple-layer cable tray fire with different cable arrangements in a closed compartment

Huang

Wang

Zeng

et al. 2019

Journal of Fire Sciences

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Fire hazard analysis of multiple-layer cable tray is an important part of nuclear safety analysis. Large-scale cable fire experiments with a three-layer horizontal cable tray were conducted in a closed compartment. The vertical temperature profile in the middle of the room was acquired. Distinctive stratification phenomena were found in the vertical temperature distribution. The interface between the upper and lower layer was located at approximately the height of the top cable layer. Heat transfer between the smoke and compartment walls occurred mainly above the smoke interface. A modified non-steady energy balance model in a closed compartment which included the effect of smoke interface height was used to estimate the compartment temperatures. Compared with the experimental results, the modified model for the multiple-layer cable tray fire in a closed compartment provides better estimation than the original model.

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An improved model for estimating heat release rate in horizontal cable tray fires in open space

Cited by 16 publications

References 11 publications

Experimental Study on Flammability and Flame Spread Characteristics of Polyvinyl Chloride (PVC) Cable

Experimental Study on Flammability and Flame Spread Characteristics of Polyvinyl Chloride (PVC) Cable

Experimental investigation of the effects of a sidewall and cable arrangement on a horizontal cable tray fire in an open atmosphere

Compartment temperature estimation of a multiple-layer cable tray fire with different cable arrangements in a closed compartment

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