14 Fabrication and Thermal Performance Evaluation …
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Fig. 14.3 Temperature
response of MSLPCM heat
pack at ambient temperature
0 °C, recorded from in-house
developed T-history
measurement setup. The
small oscillations (<5 °C) in
ambient temperature are
attributed to the temperature
feedback control, causing
variations during its on-off
cycles
0
60
120
180
240
300
360
0
20
40
60
T ( º
C)
t (Minutes)
MSLPCM pack temperature
Ambient temperature
14.3.2 Thermal Performance Evaluation of Water Heat Pack
A DI water heat pack, identical to the MSLPCM heat pack, is fabricated to compare
the thermal performance with SAT based heat pack. The temperature of water heat
pack is measured from 70 °C at ambient temperature 0 °C, and the results are shown
in Fig. 14.4. The water heat pack took ~48 min for cooling from 70 to 30 °C, as
normal sensible heat release process.
Fig. 14.4 Temperature
response of water heat pack
at ambient temperature 0 °C,
used for comparison with
SAT PCM heat pack. Here
also small oscillations are
attributed to on-off cycles of
temperature feedback control
while cooling the chamber
0
60
120
180
240
300
360
0
20
40
60
T ( º
C)
t (Minutes)
Water pack temperature
Ambient temperature