The principal function
of clothing assembly is to provide the wearer with protection against
undesirable environments. Due to the fact that a human being is homeo thermal,
the human body regulates temperature in narrow limits around 370C 2.But
Fabrics containing PCMs appear to be effective in contributing to apparel
comfort by buffering and reducing over heating, the cause of
perspiration.
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| PCM |
The fabrics with PCM
react immediately to changes in environmental temperature and adapts to the
prevailing hot or cold conditions. When temperature rise occurs as a result of
body activity or a higher environmental temperature, PCM reacts by absorbing the
heat. Storing this surplus energy the PCM liquefies. This phase change produces
a temporary a temporary cooling effect in the clothing layers. Once the PCM has
completely melted, the storage of heat stops. The PCM releases the stored heat
with a drop of environmental temperature or when the body is at rest, and a
temporary warming effect occurs in clothing layers. This heat exchange produces
a buffering effect in clothing layers, minimizing changes in skin temperature.
PCM
MATERIALS AND THEIR CHARACTERISTICS
Suitable melting temperature
High melting enthalpy per volume unit
[kJ/m³]
High specific heat [kJ/(kg.K)]
Low volume change due to the phase change
High thermal conductivity
Cycling stability
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