Accession Number : AD1016232

Title :   Black Versus Gray T-Shirts: Comparison of Spectrophotometric and Other Biophysical Properties of Physical Fitness Uniforms and Modeled Heat Strain and Thermal Comfort

Descriptive Note : Technical Report,01 Jan 2013,31 Dec 2016

Corporate Author : U.S. Army Research Institute of Environmental Medicine Natick United States

Personal Author(s) : Potter,Adam W ; Blanchard,Laurie A ; Gonzalez,Julio A ; Berglund,Larry G ; Karis,Anthony J ; Santee,William R

Full Text :

Report Date : 01 Sep 2016

Pagination or Media Count : 22

Abstract : This work modeled and compared the heat strain and discomfort differences between black and gray t-shirts. Biophysical properties were measured for 5 ensembles using a sweating thermal manikin. These results showed little differences existed across each of the ensembles, where at 0.4 m/s the ranges were between 0.88 0.92 clo and the evaporative potential (im/clo) ranged from 0.51 0.54. Spectrophotometric measures differed across the ensembles, where reflection () 0.24 0.49, absorption () 0.5 0.75, and transmission () 0.01 0.04. Predictive modeling showed that heat strain responses were similar for all of the ensembles. While overall the wicking gray shirt had generally better and the wicking black shirt had least favorable values; the differences in impositions to the human are relatively negligible. Similar to the heat strain predictions, modeling for thermal sensation (discomfort) showed very little difference between each of the clothing ensembles. Results support the interest of the Army for purchasing and implementing the replacement of the former gray physical fitness t-shirt with a new black physical fitness t-shirt.

Descriptors :   thermal resistance , materials , physical fitness , predictive modeling , clothing , heat transfer , body temperature , air temperature , equations , wind velocity , surface temperature , Mathematical models , TEMPERATURE CONTROL , Physiological effects , Solar radiation , Clothing , Heat stress (Physiology) , Mannequins

Distribution Statement : APPROVED FOR PUBLIC RELEASE