Q74: Temperature of Air blast freezing - Food Engineering / Packaging and Labeling - Food Processing Technology- ICAR JRF/SRF 2024 | Agrigyan

• 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