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<p>This study focuses on a fire scenario involving an electrical cabinet in a mechanically ventilated compartment and the performance of a water mist system in controlling the fire. The study is based on large-scale experiments involving a real cabinet containing approximately 45&#xa0;kg of combustible material with open doors on both sides. The parameters studied were the compartment’s ventilation flow rate and the water mist system’s characteristics, including the nozzle type and activation time. Characterization of the fire source in an open environment shows a maximum heat release rate (HRR) of 2.7&#xa0;MW. In a compartment, this value decreases due to oxygen depletion and is reduced to 1.6&#xa0;MW. The performance of the water mist system is evaluated based on the reduction of the maximum HRR and total heat released. The most efficient configuration is obtained with a low ventilation flow rate of the compartment to prevent droplets from being extracted from the compartment and a short activation time of the water extinguishing system. The most effective configuration reduces the maximum HRR by 54% and the total heat released by 69%. This study provides insights into fire scenarios involving electrical cabinets, that can be used as guidelines for risk assessment and water mist system design.</p>

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Experimental Study of Electrical Cabinet Fires in a Mechanically Ventilated Compartment Equipped with a Water Mist System

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Hugues Prétrel,
  • Jérémy Séguillon,
  • Sylvain Suard

摘要

This study focuses on a fire scenario involving an electrical cabinet in a mechanically ventilated compartment and the performance of a water mist system in controlling the fire. The study is based on large-scale experiments involving a real cabinet containing approximately 45 kg of combustible material with open doors on both sides. The parameters studied were the compartment’s ventilation flow rate and the water mist system’s characteristics, including the nozzle type and activation time. Characterization of the fire source in an open environment shows a maximum heat release rate (HRR) of 2.7 MW. In a compartment, this value decreases due to oxygen depletion and is reduced to 1.6 MW. The performance of the water mist system is evaluated based on the reduction of the maximum HRR and total heat released. The most efficient configuration is obtained with a low ventilation flow rate of the compartment to prevent droplets from being extracted from the compartment and a short activation time of the water extinguishing system. The most effective configuration reduces the maximum HRR by 54% and the total heat released by 69%. This study provides insights into fire scenarios involving electrical cabinets, that can be used as guidelines for risk assessment and water mist system design.