Measurements of melting point and latent heat
storage capacities of different materials were
performed in a differential scanning calorimetry model DSC Q100 of TA Instruments
equipped with a refrigerated cooling system an
d nitrogen as the purg
e gas. Measurements
were carried out in the temperature range from
-30ºC to 80ºC with heating and cooling rate
of 10 ºCmin
-1
.
Various samples of each experiment were analyzed at least three times and the average
value was recorded. DSC analyses of coatin
g textiles from random areas were done.
Furthermore, the encapsulation ratio of th
e different PCM in the microcapsule was
calculated with the following equa
tion based on enthalpy values:
% PCM content by weight = (
Δ
Hm /
Δ
Hpcm) x 100% (1)
where
Δ
Hm is the enthalpy for th
e analysed microcapsules (Jg
-1
) and
Δ
Hpcm is the enthalpy
of pure PCM.
In order to determine the thermal stability of
the reversible phenomen
a of phase change, the
coated textiles were subjected to repeated cycles of melting and crystallization.