Ammonia Evaporator for Seafood Cold Storage

CSTHEATEXCHANGER, a professional custom ammonia evaporator manufacturer, develops specialized R717 ammonia unit coolers tailored exclusively for seafood cold storage, fish processing workshops and marine product freezing facilities. Seafood cold storage operates in harsh high-humidity, salt-laden environments, which brings severe corrosion threats to standard refrigeration coils. Our seafood-grade ammonia evaporators adopt full anti-salt-spray and food hygienic design, perfectly matching blast freezing, medium-temperature fresh seafood preservation and long-term frozen seafood storage requirements for fishing ports, seafood factories and cold chain logistics hubs.

Unique Harsh Operating Conditions of Seafood Cold Storage

Seafood processing and cold storage sites face three major challenges that ordinary ammonia evaporators cannot withstand:

High salt mist corrosion: Air contains salt particles carried by seawater, which easily erodes metal coils, casings and fan components, causing leakage and equipment failure in a short time.

Ultra-high relative humidity & heavy frost formation: Constant water vapor and fish slurry residue in the air stick tightly to coil fins, quickly blocking airflow and reducing cooling efficiency.

Multi-stage low-temperature demand: Fresh seafood pre-cooling (0~4°C), finished seafood cold storage (-18~-25°C), blast freezers for quick IQF freezing of shrimp, fish and shellfish (-30~-40°C).

Unqualified evaporators will suffer frequent frost blockage, rapid rusting and frequent maintenance downtime, leading to seafood spoilage and massive economic losses for operators. Our seafood dedicated ammonia evaporator solves all these pain points via targeted structural and material upgrades.

Anti-Corrosion & Hygienic Construction for Seafood Environment

1. Full stainless steel heat exchange core against salt corrosion

Heat transfer tubes adopt seamless SUS304 or SUS316 stainless steel, fully compatible with ammonia refrigerant and resistant to chloride ion erosion from salt fog. Copper tubes are completely eliminated to avoid chemical reaction with ammonia. All headers, collectors and coil joints are stainless steel with full penetration welding, passing strict 32.5bar hydraulic pressure testing to eliminate leakage risks in coastal salty environments.

2. Wide fin spacing + anti-corrosion epoxy coated fins

Standard fin spacing options for seafood storage: 10mm, 12mm. Wider gaps greatly reduce frost accumulation and adhesion of fish residue, maintaining stable air circulation for long-term continuous operation. Aluminum fins are covered with thick anti-salt epoxy coating, effectively isolating salt mist and humid vapor, avoiding fin oxidation and corrosion.

3. All stainless steel casing & heating trace drain pan

Unit shell, air baffles and deep drain pans are optional full SUS304 stainless steel instead of conventional galvanized steel, resisting long-term salt spray erosion. The drain pan is equipped with built-in electric heating traces to prevent defrost water and condensed brine from freezing, ensuring smooth drainage and avoiding standing water that breeds bacteria and accelerates corrosion. All surfaces are smooth without sanitary dead corners, easy to wash down after daily seafood processing shifts.

4. IP55 anti-corrosion EC fan assembly

Fans are fitted with fully sealed anti-salt fog motors with stainless steel fan blades and brackets. Variable frequency speed regulation automatically adjusts airflow according to warehouse temperature, lowering power consumption while resisting damp and salty air damage.

Three Optional Defrost Modes for Different Seafood Zones

Hot Gas Defrost (Top choice for large frozen seafood warehouses & IQF blast tunnels)

High-temperature ammonia hot gas circulates inside coils to melt frost evenly and rapidly. Short defrost cycle minimizes production interruption, low energy consumption, suitable for 24-hour non-stop seafood freezing plants with heavy frost load.

Electric Defrost (Ideal for small & medium fresh seafood pre-cooling rooms)

Built-in stainless steel heating pipes cover coils and drain pans, simple pipeline layout, low initial investment and easy on-site maintenance for small-scale fishing factory cold rooms.

Water Spray Defrost (Recommended for seafood cleaning & processing workshops)

High-pressure water spray washes fish residues, slime and salt deposits off fins during defrosting, integrating cleaning and defrost into one procedure, drastically cutting manual sanitation work for high-fouling seafood production areas.

Core Competitive Advantages for Seafood Cold Storage

Superior salt fog corrosion resistance, extended service life

Stainless steel coil + full epoxy anti-corrosion treatment enables stable operation in coastal high-salt environments, service life reaches 18–22 years, far longer than ordinary galvanized ammonia evaporators, greatly reducing equipment replacement costs.

Stable ultra-low temperature to lock seafood freshness

Ammonia R717 features outstanding latent heat transfer performance, delivering uniform cold air without temperature dead zones inside cold storage. Steady low temperature slows bacterial reproduction, retaining the texture, taste and nutritional value of fish, shrimp, crab and shellfish for long-term storage.

Low ammonia charge safety design for food processing areas

Optimized coil flow path cuts ammonia filling volume by over 35% compared with traditional evaporators. Less refrigerant inventory lowers leakage risks, complying with international safety standards for food and seafood refrigeration plants.

Remarkable energy savings for continuous production

Combined with EC variable frequency fans and high-efficiency stainless steel coils, the whole cooling system reduces power consumption by 25%–40% year-round, effectively lowering electricity expenditure for fishing ports and seafood factories running 24/7.

Low maintenance frequency & less downtime

Wide fin gaps slow frost clogging; anti-corrosion materials reduce rust and leakage failures. Operators spend far less time on coil cleaning and component repair, guaranteeing uninterrupted seafood storage and processing.

Main Application Scenarios

Fresh seafood pre-cooling rooms for fish, shrimp and shellfish (0°C ~ +4°C)

Medium-sized cold storage for short-term fresh seafood preservation

Low-temperature frozen seafood warehouses (-18°C ~ -25°C) for bulk fish, squid and shrimp storage

IQF blast freezers and quick-freezing tunnels for seafood deep processing (-30°C ~ -40°C)

Fishing port centralized cold chain logistics distribution centers

Coastal seafood processing factories, aquatic product slaughter and sorting workshops

Customization & After-Sales Service

As a direct manufacturer of industrial heat exchangers, we provide fully customized ammonia evaporators for seafood cold storage: cooling capacity ranges from 10kW to 1200kW, adjustable unit dimensions, air throw distances, fin pitches and defrost types based on warehouse size, local salt fog level and cooling load. All products undergo full air tightness and hydraulic pressure inspection before delivery, with an 18-month warranty on all pressure-bearing components.

Our full product portfolio also includes stainless steel glycol unit coolers, transcritical CO₂ gas coolers, data center dry coolers, industrial steam heating coils and other heat exchange equipment to meet diversified refrigeration demands across food industries.

If you need anti-corrosion ammonia evaporators built for seafood cold storage and aquatic processing facilities, visit our official website cstheatexchanger.com. Our professional refrigeration engineering team provides thermal load calculation, drawing design, parameter matching and full lifecycle technical support for your seafood cold chain project.