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Comparison of Stainless Steel vs. Aluminum Alloy IQF Evaporators
Stainless Steel IQF Evaporators
Seafood, salted or acidic food freezing
High‑hygiene applications: dairy products, ready‑to‑eat foods, export food lines
Deep‑freezing below -35℃, high‑pressure or CO₂ systems
Harsh, corrosive environments
Aluminum Alloy IQF Evaporators
General food freezing: fruits, vegetables, pastries, normal meat
Lightweight or mobile IQF equipment
Budget‑sensitive small and medium‑sized processing lines
Standard non‑corrosive working conditions
Typical Designs
Stainless steel tube + aluminum fin: Most widely used, balances corrosion resistance and heat transfer
All‑stainless steel: For extreme corrosion and ultra‑clean requirements
All‑aluminum: Economical, lightweight, for general IQF applications
Comparison Item | Stainless Steel (304/316) | Aluminum Alloy |
|---|---|---|
Thermal Conductivity | Low (≈16 W/(m·K)), slower heat transfer | High (≈205 W/(m·K)), higher heat exchange efficiency |
Corrosion Resistance | Excellent, resistant to acid, alkali, chloride, salt and high humidity | Fair, forms oxide film but vulnerable to strong alkali and chloride corrosion |
Mechanical Strength | High, pressure-resistant, shockproof, not easy to deform | Relatively low, soft and prone to deformation under stress |
Weight | Heavy (density ≈7.9 g/cm³) | Light (density ≈2.7 g/cm³), about 1/3 of stainless steel |
Hygiene & Food Safety | Food‑grade, easy to clean and sanitize, no heavy metal precipitation | Food‑grade applicable, but not ideal for long‑term high‑salt / acidic food |
Defrosting & Maintenance | Longer defrost interval, low maintenance frequency | Faster frost buildup, more frequent defrosting |
Cost | Higher material and fabrication cost | Lower overall cost |
Service Life | Long (10–15+ years) | Medium (5–8 years, depending on working conditions) |
