Figure 7

Schematic and pictorial representation of heat releasing process from PCM heat packs: (a) flexing triggering device to start nucleation in supercooled liquid PCM for its solidification at t = 0 second, (b) growth of solidification at t = 5 seconds, (c) complete solidification of supercooled liquid PCM at t = 55 seconds and (d) T-history curves for heat packs consisting of water, sample A and C.