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Effect of relative humidity coupled with air gap on heat transfer of flame-resistant fabrics exposed to flash fire
Li Jun 1 *,Lu Yehu 2,Li Xiaohui 1
1.Protective clothing research center,Fashion Institute,Donghua University,Shanghai 200051,China
2.Key Laboratory of clothing design and technology,Ministry of Education,Shanghai 200051,China
*Correspondence author
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Funding: 高等学校博士学科点专项科研基金（No.20110075110005）
Opened online:12 July 2013
Accepted by: none
Citation: Li Jun,Lu Yehu,Li Xiaohui.Effect of relative humidity coupled with air gap on heat transfer of flame-resistant fabrics exposed to flash fire[OL]. [12 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4550799
 
 
Relative humidity (RH) and air gap size are two characteristic indices of clothing microclimate. The current thermal protective performance (TPP) tests can't evaluate protective performance of fabrics under microclimate with high temperature and humidity. In this study, a newly modified TPP test apparatus was applied to investigate the effect of RH in microclimate on heat transfer of fabrics exposed to flash fire. Air gap heights from 0 to 24mm with increment of 3mm were employed. Three microclimates with different RH were preconditioned respectively. The results indicate that the RH in microclimate significantly improves thermal protection of fabric with various air gaps. Under 35% RH, the TPP obviously increases with the air gap up to 15mm and then the increment becomes a little lower; under humidified condition (65% or 95% RH), it becomes higher substantially with air gap height increasing until 12mm, subsequently it decreases or increases alternatively if the size kept increasing. The positive effect of air gap with small size on thermal protective performance of fabrics is enhanced due to the increasing of vapor in the air; however, the positive effect of air gap with large size is interfered by the RH. It is indicated that around 12-15mm was a critical air gap size under 35% RH, while about 12mm was a key air gap size for damp microclimate with 65% or 95% RH.
Keywords:Clothing microclimate; thermal protective performance; air gap; flame-resistant fabric; flash fire
 
 
 

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