Views: 0 Author: Site Editor Publish Time: 2026-06-08 Origin: Site
In the frozen seafood business, ammonia evaporators handle heavy moisture loads and extremely low temperatures. These systems offer superior thermodynamic efficiency for blast freezing (down to -40°C) and cold storage. Because ammonia corrodes copper and aluminum, robust stainless steel or hot-dip galvanized steel coils with aluminum fins are required.
Key System Requirements for Seafood
Evaporator Type: Choose pump-recirculated (flooded) or gravity-flooded evaporators. They ensure completely wetted internal surfaces, providing more stable and efficient heat transfer than direct expansion (DX) systems.
Material Compatibility: Coils must be manufactured using stainless steel or steel tubes. Avoid copper entirely. For fins, specialized coated aluminum or hot-dip galvanized steel provides durability against the highly corrosive, salt-rich environment of seafood plants.
Defrosting Mechanism: Rapid ice buildup is inevitable in seafood freezers. Select units equipped with hot-gas defrosting or water defrosting systems to quickly clear frost without long operational downtimes.
Fin Spacing: For freezer rooms (-18°C to -40°C), opt for wider fin spacing (e.g., 8 mm to 12 mm) to reduce the frequency of defrost cycles.
