Article

Comparative study of radiant heat flux density transmission through firefighter protective clothing

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Abstract

The main purpose of this research is to find out possibility of improvement in thermal protective performance (TPP) of fire fighter protective clothing (FFPC) when subjected to radiant heat flux density of 10 kW/m². Enlargement of TPP is related to the increase of time period when subjected to radiant heat flux density may provide surplus time for fire fighter to carry out duties without enduring harmful injuries. Each FFPC specimen constitutes outer shell, moisture barrier and thermal barrier. However, aerogel blanket was also utilized as substitute to thermal barrier because of its excellent thermal insulation property and inflammable nature. Preliminary testing was related to evaluating thermal resistance and thermal conductivity. Later experimentation involves exposure of multilayer FFPC specimen to radiant heat flux density of 10 kW/m². It was witnessed that those combinations in which aerogel blanket was utilized deliver higher thermal resistance i.e.0.1748 m²K/W and improved TPP behavior in terms of transmitted heat flux density Qc (0.70 kW/m²) and percentage transmission factor (6.70%). © 2018 Slovak University of Technology in Bratislava. All rights reserved.

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... Silica aerogel (particle size 2-10 μm), showed little effectiveness at blocking irradiated heat. In contrast, a 7% reduction of heat transfer was observed with a blanket of silica aerogel in firefighter protective clothing, which was attributed to the aerogel's absorption of infrared radiation [57]. Such apparent discrepancies show that applying aerogels to textiles is a vibrant area of research, with many questions still to be answered. ...
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The high specific surface areas and porosities of aerogels can impart desirable properties to textiles. The most established application of aerogels in textiles is the enhancement of thermal insulation and this has been the subject of some excellent reviews. This review, for the first time, discusses the other applications of aerogels in textiles and considers enhancements in mechanical and acoustic properties, water repellency, permeability to air and water, acoustics, protection from radiation, chemicals and fire, and the remediation of textile processing effluent. These discussions are underpinned by the various approaches and materials employed for preparing aerogels, and the methods for incorporating them into textiles. Future prospects for aerogels in textiles are reviewed, and it is likely that innovations in aerogels driven by the energy storage, aerospace, and medical technology sectors such as lower production costs and greater use of biopolymers, and hybrids will underpin innovation in textile-aerogels. It is hoped this review will inspire collaboration between researchers in the fields of aerogels and textiles.
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