2007, Piran, Slovenia

Thermal comfort
THE EVALUATION OF THERMAL COMFORT FOR CB
PROTECTIVE GARMENTS
Y. W. Lin 1 , G. T. Jou 1 , G.H. Lin 1 , Y. C. Chang 1 , T.F. Lai 2
1 Taiwan Textile Research Institute, No.6, Chengtian Rd., Tucheng City, Taiwan (R.O.C)
2 Chung-Shan Institute of Science and Technology, Lung-Tan, Taiwan (R.O.C))
Contact person: gtJou.0219@ttri.org.tw
INTRODUCTION
Recently, the joint service lightweight integrated suit technology (JSLIST) garment has been
widely adopted by the U.S. Army, Navy, Air Force, Marine Corps. This garment features not
only chemical protection improvements, but also greater mobility, and heat stress reduction
for the wearer.[1] To understand whether there is any difference among thermal comfort
properties in the Taiwan climate, that could be described in objective way for the JSLIST
garment, a battle dress overgarment (BDO) and an emergency chemical and biological (CB)
suit, a series of experiments were conducted using a skin model system, sweating torso and
sweating manikin.
METHODS
Skin Model System: According to ISO 11092, the test set the measuring plate at 35 and the
air condition at 35 , 40% R.H. The air velocity was controlled at 1 m/s [2].
Sweating Torso System: The sweating torso system developed by EMPA Switzerland is a
cylinder with the dimension of a human trunk [3]. The condition of the test using the torso is
described in Table 1. To understand the thermal comfort of this clothing in Taiwan region, we
measured with sweating torso system under condition similar to summer in Taiwan: 28 ,
75% R.H. [4].
Table 1 Phase profile of sweating torso evaluation
Phase and Period Moderate
rate
metabolic High metabolic rate
1 hour acclimatization Surface 35 Surface 35
1 hour sweating 82W, 100g/hr 118W, 300g/hr
1 hour recreation 23.5W 23.5W
Sweating thermal manikin: 1 Measurement system: The thermal manikin called Huey was
made by MTNW Company, designed with 1.75 m 2 surface area, 1.7 m height [5]. In this state,
we analysed thermal resistance (R, clo) and the permeability index (im) of the 3 CB suits
without consideration of the hands and face part of the manikin because there is no protective
equipment on these areas in this study. The condition where the manikin stood was set to
28 , 75% R.H. as summer condition. 2 Evaluation method: According to Woodcock, A.H.
works [6], dry heat transfer (HD) and evaporative heat transfer (HE) could be calculated by the
following equations:
6.
45(
TS Ta
) 2
H
W/m .......... ......( 1
−
=
H
D
E
=
14.
3
( ) )
R
× im × ( PS
− Pa
) 2 ( W / m ) .......... ......( 2)
R
where: Ta and Pa stand for air temperature ( ) and water vapor pressure (mmHg), Ts
and Ps are the temperature and water vapor pressure on the skin surface.
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