Water Mist Fire Suppression System Research Articles

A REVIEW ON STUDYING EXTINGUISHING ROOM FIRES BY WATER MIST

There have been numerous studies on extinguishing room fires by water mist fire suppression system (WMFSS) in the past decade. Interactions between the fire-induced flow and the discharging water mists were studied. Carrying out experiments with physical models to understand more on the physics of experiment is expensive. Therefore, well-validated numerical models by fire tests are also required. These models are commonly used as an engineering tool for designing water mist fire suppression system. In addition to taking the room as a homogeneous zone, two-layer zone approach is also used. Results based on these approaches were applied to evaluate the performance of water mist system. The application, advantages, limitations, and key results of the theories on predicting the performance of water mist fire suppression system will be reviewed in this article. Language: en

On the Fire Protection of a Commercial Kitchen Using Water Mist Fire Suppression Systems

The feasibility of using water mist fire suppression systems (WMFSS) in a commercial kitchen was discussed in this paper. Active fire protection systems (or called fire services installation in Hong Kong) required for kitchens were outlined. Advantages and disadvantages of WMFSS were discussed. Recommendations were made on the potential application strategies. An example was used to illustrate the design of the system.

Application of Water Mist Fire Suppression Systems in Small Retail Shops

Protecting small retail shops packed with combustible goods by sprinkler system might not be too satisfactory. Any delay in system activation will lead to a flashover fire. Also, there might be serious water damage which is not good for shops selling expensive items. Alternative fire protection systems should be searched for. Water mist might be effective for suppressing postflashover fires if the system is designed properly. Whether water mist fire suppression systems can be used in the small shops is discussed in this paper. Key factors affecting the system performance will be discussed. Potential application strategies are outlined. An example was used to illustrate the design of the system.

Examination of Performance of WaterMist Fire Suppression Systems underVentilation Conditions

This paper describes water mist fire suppression effectiveness under various ventilation conditions. The full-scale fire test series were conducted in an empty enclosure and in a simulated machiner...

A Study of Total Flooding Water Mist Fire Suppression System Performance Using a Transient One-Zone Computer Model

Due to the intense R&D activity in the field of water mist fire suppression during the past decade, the qualitative and quantitative understanding on the performance of water mist has increased significantly. This development has led to a point in which quantitative theoretical models describing large-scale water mist fire suppression systems begin to emerge. This paper describes the composition and validation of one such model, designed for total flooding water mist applications, especially against flammable liquid hazards in enclosures. The basic construction of the model is first described, followed by an example on the validation of the model using full-scale experimental data. The model is then used to investigate the limitations to the maximum possible mist concentration in the protected space. The potential of the model as an engineering tool is illustrated by making predictions on the scaling laws associated with water mist systems in the framework of IMO MSC/Circ.668/728 as the enclosure volumes and ventilation conditions are varied. The predictions are found to be in agreement with what is indicated by the recent US Coast Guard test series in very large machinery spaces.

The Capabilities and Limitations of Total Flooding, Water Mist Fire Suppression Systems in Machinery Space Applications

Water mist fire suppression systems are being seriously considered as replacements for Halon 1301 total flooding systems in machinery space applications. A “total flooding” water mist system is designed to discharge mist uniformly throughout the entire enclosure/compartment. The tests conducted to date form a substantial database for water mist systems installed in machinery spaces with volumes from 100 m3 to 1,000 m3 and varying degrees of ventilation. These tests have also identified the strengths and limitations of water mist in these applications. This report describes the capabilities of total flooding water mist fire suppression systems in machinery space applications.

A Review of Water Mist Fire Suppression Systems-- Fundamental Studies

The progress on the research and application of water mist systems in fire suppression has been substantial over the last decade. To bring this work into focus, a review has been undertaken to identify future developments and potential efficacy improvements for water mist fire suppression systems. This paper, as a first step, provides a review of the fundamental research in water mist fire suppression systems. This includes a review of extinguishing mechanisms and the factors that influence the performance of water mist, such as spray characteristics, enclosure effects, dynamic mixing, the use of additives and methods of generating water mist. Recent studies on the use of computer modeling for the development of water mist fire suppression systems are also reviewed and discussed.The review shows that the extinguishing mechanisms and the role of spray characteristics in fire suppression have become well understood and identified. Water mist does not behave like a true gaseous agent in fire suppression. T...

On water mist fire suppression mechanisms in a gaseous diffusion flame

Abstract This is work is motivated by the urgent need to find an alternative to the banned halogen-based fire suppressing agents. Fine water mist is a contending alternative especially in total flooding applications. To obtain an optimum design of a water mist fire suppression system, one needs to understand the mechanisms of fire suspension by water mist. This paper presents a study of the relative contributions of the suppression mechanisms in a gaseous diffusion flame. A modified Wolfhard–Parker burner was used to measure temperature drops in a 2D methane diffusion flame, when various quantities of nitrogen, steam and water mist were added independently in a co-flow arrangement. A simple model of the flame was used to estimate the heat generation and loss processes taking place in the flame when small amounts of various suppressants were added. The results of both experiments and the analysis show that in a co-flow arrangement the addition of small quantities of fine water mist has more gas phase cooling effect on the flame than oxygen dilution effect.