Q.3
Temperature of Air blast freezing
- Temperature Profiles in Air Blast Freezing:
- Operating Ranges:
- Air blast freezers circulate high-velocity cold air ($v = 2 - 6\text{ m/s}$) across food products in batch chambers or continuous spiral/tunnel freezers.
- Operating evaporator air temperatures typically range between $-18^\circ\text{C}$ and $-34^\circ\text{C}$ (down to $-40^\circ\text{C}$ for IQF blast tunnels), driving rapid heat removal and fine ice crystal formation.
- Conclusion: -18°C to -34°C (Option 1).
Correct option: (1) -18°C to -34°C
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