2007, Piran, Slovenia

Environmental Ergonomics XII
Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana 2007
220
TEMPERATURE DISTURIBUTION OF THE PROTECTIVE
CLOTHING SYSTEM DURING EXPOSURE TO SOLAR AND
INFARED RADIATIONS
Takako Fukazawa*, Emiel A. den Hartog, Yutaka Tochihara, George Havenith, and
THERMPROTECT Network
TNO Defence, Safety and Security, Department of Human Performance, Soesterberg, The
Netherlands, * Presently with Fukuoka Women’s University, Fukuoka, Japan
Contact person: fuka@fwu.ac.jp
INTRODUCTION
The THERMPROTECT project has been conducted to improve standards for the protective
clothing (PC) systems for various radiant environments, such as solar and long-wave
radiation. In the present study, we have developed an analytical model of a radiant heat
transfer to obtain temperature distributions in the PC system.
METHODS
A simple one-dimensional model was employed for the analysis. The model consists of a
modelled skin, 5-layered underwear, an air gap of 8 mm thick and a PC of 0.55 mm thick. In
the model, based on experimental data, in the case of exposure to the radiant source, we
assume that the radiant heat flux attenuates in the PC due to the radiation permeation. That is,
the highest temperature takes place not on the outside, but inside of the PC itself, as shown in
Figure 1. In the present study, several types of the PC were selected. Properties of the tested
materials are summarised in Table 1. They are identical in material, but different in colour.
Experiments are performed at 20°C, employing two radiant conditions: long wave of 700
W·m -2 and solar of 1,000 W·m -2 .
Figure 1. Theoretical model of the heat transfer “with”/“without” exposure to the
radiant heat source. In the model, Tw is the surface temperature of the skim model, Tn
the underwear temperature, Tin and Tsurf the temperatures of both sides of the PC. δn and
δsp are the radiant permeation depth of the underwear and the PC, respectively.