JP Journal of Heat and Mass Transfer
Volume 5, Issue 1, Pages 41 - 58
(February 2011)
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HEAT AND MOISTURE TRANSFER IN SAFETY HELMET
S. Ben Amar, M. T. Halimi, M. Ben Hassen and F. Sakli
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Abstract: Improving thermal comfort of safety helmet becomes one of the major interests of helmet designers. This paper presents a numerical simulation of heat and mass transfer from the head to the helmet microclimate, which can avoid using thermal manikins and controlled human trials. The temporal variation of temperature and relative humidity in the helmet microclimate is experimentally investigated. After this, a geometrical model is proposed taking into account the technical characteristics of the helmet liners. The equations that generate the heat and mass transfer between the helmet wearer and his environment are formulated and solved using finite difference method. Results indicate that the textile fabric has an important part to manage the transfer mechanisms, the microclimate saturation and consequently the comfort sensation. |
Keywords and phrases: heat and mass transfer, safety helmet, comfort, evaporation, sorption, diffusion. |
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