Individual Quick Freezing (IQF) of Small Fish Products:
Fluidized Bed Freezers: Operate by forcing refrigerated air (at $-35^\circ\text{C}$ to $-40^\circ\text{C}$) upward through a perforated conveyor mesh at a controlled high velocity ($2-5\text{ m/s}$).
The vertical air drag suspends and fluidizes small discrete food items (such as shrimp, small fish, fish balls, diced fish fillets), freezing them individually and uniformly in $3-15\text{ minutes}$ while preventing clumping, agglomeration, or belt sticking.
Air blast and tunnel freezers take longer and cause particle agglomeration.
Correct Option: Option 1 (Fluidized bed freezer).
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Ammonia ($R\text{-}717$, $NH_3$): The standard refrigerant in large-scale seafood processing factories, plate freezers, IQF tunnels, and cold storages.
Key Advantages:
High latent heat of vaporization ($1369\text{ kJ/kg}$ at $-33.3^\circ\text{C}$), requiring smaller refrigerant circulation rates.
Environmentally benign: Zero Ozone Depletion Potential ($\text{ODP} = 0$) and zero Global Warming Potential ($\text{GWP} = 0$).
Self-alarming pungent odor for rapid leak detection and low capital operational cost.
Correct Option: Option 2 (Ammonia).
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