TY  - JOUR
TI  - Thermal and evaporative resistance measured in a vertically and a horizontally oriented air gap by Permetest skin model
AU  - FUNG, FREDERICK
AU  - HES, LUBOS
AU  - UNMAR, ROSHAN
AU  - BAJZIK, VLADIMIR
T2  - Industria Textila
AB  - This paper is a study of the correlation of the thermal resistance (Rct) and the evaporative resistance (Ret) in verticallyand   horizontally   oriented   air   gaps   by   using   the   portable   Permetest   skin   model.   Experiments   were   done   in   a   climaticchamber; an isothermal condition for Ret tests and non-isothermal condition for Rct tests. Foamed polyethylene air gapdistance rings were prepared with a thickness of 2, 4 and 5 mm and their combinations to simulate the air gap distancefrom 0 to 16 mm which is more than the expected average gap in clothing systems. Test samples were woven fabric of100 percent cotton, 100 percent polyester and their blends plus 100 percent of polypropylene, all have similar weightand structure. Results showed that with the increasing thickness of the air gap, Rctincreased in a polynomial trend andRet in a linear proportional rate up to 12 mm then started to change due to the effect of free convection and the differentproperties of materials. The surprising positive observation is that results from the horizontally and vertically oriented airgaps   are   very   similar,   and   most   of   the   results   from   the   vertical   air   gap   are   slightly   lower   than   the   results   from   thehorizontal air gap in all materials.
DO  - 10.35530/IT.072.02.202038
VL  - 72
IS  - 2
SP  - 168
EP  - 174
LA  - English
SN  - 1222-5347
UR  - http://www.revistaindustriatextila.ro/images/2021/2/08%20FREDERICK%20FUNG%20Industria%20Textila%202_2021.pdf
ER  -