Views: 0 Author: Site Editor Publish Time: 2026-11-04 Origin: Site
At CSTHEATEXCHANGER, we design and manufacture industrial Hygienic IQF Evaporators and Air Cooling Coils engineered specifically for continuous shrimp (raw head-on, cooked peeled, butterfly prawns) and fish fillet (salmon, tilapia, cod, pollock, pangasius) freezing lines (refrigeration capacities engineered from 40 kW to over 1,200 kW per coil block, air circulation delivery rates from 15,000 m3/h to over 280,000 m3/h, operating at evaporating temperatures of −35∘C to −45∘C with ammonia NH3, CO2, or Freon refrigerants). Designed to handle high surface water glazing, steaming cooked moisture, and marine salt aerosols, our seafood IQF evaporators integrate seamless AISI 304/316L stainless steel tubes, marine-grade AlMg3 aluminum fins (or 100% all-stainless construction), progressive variable fin spacing (16 mm / 20 mm inlet down to 8 mm / 6 mm discharge), and dual-circuit pan-first rapid hot gas defrost systems (<15–20 minutes). CST coils eliminate frost face choking for 16–24+ hours of continuous production, maintain tight core cell integrity, minimize product dehydration (<0.8%), and ensure zero ice glaze melting.
Seafood freezing presents demanding thermodynamic conditions—steaming cooked shrimp (+45∘C+45∘C to +60∘C+60∘C), wet washed raw fish fillets, and post-freeze protective water glazing (+1∘C+1∘C to +4∘C+4∘C):
SEAFOOD IQF FREEZING LINE EVAPORATOR AIRFLOW DYNAMICS
======================= WARM GLAZED SEAFOOD / STEAMING SHRIMP INFEED =======================
[ High Moisture + Marine Salt Aerosol Swept into -38°C Spiral / Tunnel Freezing Zone ]
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┌────────────────────────────────────────────────────────────────────────────┐
│ [ZONE 1: EXTRA-WIDE INLET FIN SPACING (16 mm - 25 mm / 1.0 - 1.5 FPI)] │
│ • Absorbs 70% of airborne water vapor without blocking the air face │
│ • Heavy snow deposits deeply along open fin channels without bridging │
└───────────────────────────┬────────────────────────────────────────────────┘
│ (Air temperature drops to -25°C)
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┌────────────────────────────────────────────────────────────────────────────┐
│ [ZONE 2: INTERMEDIATE FIN SPACING (10 mm - 14 mm / 1.8 - 2.5 FPI)] │
│ • Balances residual latent moisture removal with sensible cooling │
│ • High-static airflow prevents snow entrainment onto seafood conveyor belt │
└───────────────────────────┬────────────────────────────────────────────────┘
│ (Air temperature reaches -38°C to -40°C)
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┌────────────────────────────────────────────────────────────────────────────┐
│ [ZONE 3: TIGHT DISCHARGE FIN SPACING (6 mm - 8 mm / 3.2 - 4.2 FPI)] │
│ • Maximum thermal density extracts core heat to complete deep freezing │
│ • Dehumidified dry air prevents surface ice recrystallization on fillets │
└───────────────────────────┬────────────────────────────────────────────────┘
│
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======================= HIGH-VELOCITY DISCHARGE AIR CURTAIN (-40°C) =======================
[ Sweeps Across Spiral/Tunnel Belt -> Rapid Crust Freezing Locks Cell Structure in < 90s ]================================================================================
CST SEAFOOD IQF EVAPORATORS VS. CONVENTIONAL COLD STORAGE UNIT COOLERS
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Engineering Parameter Standard Cold Room Cooler CST Seafood IQF Freezing Coil
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Fin Spacing Across Coil Depth Uniform (e.g., 9 mm or 12 mm) Progressive Staged: 20 mm -> 12 mm -> 6 mm
Continuous Production Run Time Chokes with Frost in 4–6 Hours Continuous 16 to 24+ Hours (Full Shift)
Defrost Cycle Duration 45 to 75 Minutes (Electric) 15 to 20 Minutes (Dual Hot Gas Pan-First)
Room Temperature Rise During +10°C to +15°C (Melts Glaze) Minimal (+2°C to +4°C Max Glaze Protection)
Product Dehydration (Drip Loss)1.8% to 2.5% Weight Loss Ultra-Low (< 0.8% Moisture Loss)
Corrosion Defense against Salt Standard Copper/Al (Pits fast) AISI 316L Stainless Tubes + AlMg3 Fins
Drain Pan Water Drainage Flat Pan (Ice dams & overflows) 3° Continuous Slope + Heated Double Pan
CIP Washdown Compatibility Fins Bend under Pressure Wash Heavy 0.45 mm Fins Resist CIP High-Pressure
================================================================================Delicate seafood (snapper, salmon, peeled shrimp) is prone to cellular damage if freezing is sluggish. CSTHEATEXCHANGER designs IQF coils with large active surface areas and low log-mean temperature differences (LMTD=4 to 5 K), maintaining high relative humidity inside the freezer enclosure to prevent freezer burn and hold product weight loss below 0.8%.
Electric defrost takes over an hour and warms the entire enclosure, melting protective ice glazes on seafood products. Our interlaced hot gas defrost system routes compressor discharge gas (+35∘C to +40∘C) through the insulated bottom drain pan first, preheating the pan surface to instantly melt falling ice slabs before clearing the coil block in under 15 to 20 minutes.
Seafood processing environments carry high humidity combined with trace chlorides and daily chemical washdowns:
CST SEAFOOD IQF EVAPORATOR STRUCTURAL ELEVATION
======================= FULL AISI 304/316L STAINLESS CASING =======================
[ Heavy Sloped Hygienic Framework with Hot Gas Headers & IP66 Axial Fans ]
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┌────────────────────────────────────────────────────────────────────────────┐
│ CORE SUBASSEMBLY INTEGRATION │
│ ┌────────────────────────┐ ┌────────────────────────┐ ┌──────────────────┐ │
│ │ AISI 316L TUBE CORE │ │ HEATED DRAIN PAN │ │ REFRIGERANT HDR │ │
│ │ Marine AlMg3 Fins │ │ Dual hot-gas coils │ │ Stainless steel │ │
│ │ Progressive Fin Pitch │ │ 3° continuous slope │ │ Overfeed pump cir│ │
│ └────────────────────────┘ └────────────────────────┘ └──────────────────┘ │
└────────────────────────────────────────────────────────────────────────────┘ CST FULL HYGIENIC CIP SLOPED DRAIN PAN & DUAL HOT GAS MANIFOLD
FROM REFRIGERATION COMPRESSOR DISCHARGE (+35°C HOT GAS)
┌─────────────────────────────────────────────────────────────────────────┐
│ [ STAGE 1: DUAL-CIRCUIT STAINLESS STEEL DRAIN PAN HEATING COILS ] │
│ Preheats pan to +25°C -> Instantly melts falling ice chunks & glaze │
├─────────────────────────────────────────────────────────────────────────┤
│ [ STAGE 2: INTERLACED TUBE COIL HOT GAS EXPANSION HEADERS ] │
│ Inside-out thermal conduction breaks tube-to-frost bond in < 8 minutes │
└─────────────────────────────────────────────────────────────────────────┘
ALL DRAIN WATER EXPELLED VIA OVERSIZED SLOPED DRAIN FITTINGS IN < 15 MINSeafood brine and glaze water contain active sodium chloride ions. We fabricate our tube bundles from seamless AISI 316L stainless steel (with molybdenum addition) and utilize marine-grade AlMg3 magnesium-aluminum alloy fins (or optional 100% AISI 316L stainless steel fins) to resist pitting corrosion from marine salts and daily chlorinated/acidic CIP foam washdowns.
The evaporator casing is continuous TIG-welded from 2.5 mm to 3.0 mm AISI 304/316L stainless steel. With an engineered continuous 3∘3∘ sloped bottom, oversized drain ports, and aerodynamic fan cowls, our units eliminate standing water pools and prevent defrost moisture droplets from blowing back onto frozen fillets.
CSTHEATEXCHANGER SEAFOOD FREEZING COIL CONFIGURATIONS
[1. CONTINUOUS SPIRAL FREEZER EVAPORATOR ARRAYS]
• High-static horizontal airflow design mounted along single and double drum spiral freezer walls.
• Features staged 20 mm -> 12 mm -> 6 mm fin pitch for 24-hour continuous glazing runs.
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[2. FLUIDIZED BED & MESH BELT TUNNEL FREEZER COILS]
• High-velocity vertical and horizontal aeration coils for individually quick-frozen shrimp and fillets.
• Heavy 0.45 mm AlMg3 fins withstand high-frequency aerodynamic pulsations.
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[3. MULTI-PASS CRUST FREEZING & GLAZING PRE-COOLERS]
• High-velocity blast coils designed for rapid crust freezing before secondary water glazing lines.(Note: The following engineering parameters represent standard manufacturing design envelopes. Tube circuits, progressive fin pitch stages, hot gas headers, and casing dimensions are customized to specific seafood processing line drawings.)
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CSTHEATEXCHANGER SEAFOOD IQF EVAPORATOR (CST-IQF-SEAFOOD SERIES)
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Engineering Parameter Standard Manufacturing & Design Range
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Refrigeration Capacity Range 40 kW to 1,200+ kW per evaporator unit (Scalable)
Air Circulation Flow Rates 15,000 m³/h to 280,000+ m³/h (8,800 to 165,000+ CFM)
Operating Evaporating Temp. -35°C to -45°C (-31°F to -49°F) Deep Freezing
Compatible Refrigerants NH3 (R717 Overfeed Pump Circulation), CO2 (R744), R404A, R507
Defrosting Technology Rapid Dual-Circuit Hot Gas (Pan-First Heating Loop)
Average Defrost Duration 15 to 20 Minutes Complete Cycle (Rapid Thermal Shedding)
Progressive Fin Pitch Stages Inlet: 16–25 mm -> Middle: 10–14 mm -> Discharge: 6–8 mm
Tube Metallurgy Options Seamless AISI 304, AISI 316L Stainless Steel, Heavy Copper
Tube Outside Diameter & Wall 5/8" (15.88 mm) or 3/4" (19.05 mm) OD; Wall: 0.8 mm to 1.5 mm
Fin Material Options Marine-Grade AlMg3 Aluminum Alloy, Pure Al, AISI 316L Stainless
Fin Thickness Range 0.35 mm to 0.50 mm (Heavy gauge for high-pressure CIP washdown)
Casing & Frame Construction Continuous TIG-Welded AISI 304 or AISI 316L Stainless Steel
Drain Pan Configuration Double-Wall Insulated, 3° Sloped Bottom, Dual Hot-Gas Heating Coils
Axial Fan Array Specifications IP66 Washdown Direct-Drive Axial Fans, Cast Aluminum Impellers
Operating Pressure Rating NH3 / Freon: 25 bar (362 psi) | CO2: Up to 90 bar (1,305 psi)
Pressure Vessel Compliance ASME Section VIII Div. 1, CE / PED 2014/68/EU, 3-A Sanitary / USDA
Quality Assurance & Leak Gate 100% Helium Mass Spectrometer Vacuum Testing (Zero Leak Standard)
================================================================================Seafood infeed lines carry high surface moisture and glaze water that rapidly condenses onto the first few tube rows. With wide 16–20 mm fin spacing at the inlet, frost deposits evenly along the fin depth without bridging the face. The fin spacing then tightens to 6–8 mm at the discharge, extending continuous defrost-free freezing runs to 16–24+ hours.
When ice melts from the upper coil, heavy chunks fall into the bottom pan. If the pan is cold, these chunks refreeze and block the drain line. CSTHEATEXCHANGER's pan-first circuit routes hot discharge gas through stainless steel coils welded inside the insulated drain pan before reaching the coil, preheating the pan surface to +25∘C so falling ice immediately melts and drains away.
Yes. We specialize in engineering 100% dimensional drop-in replacement evaporator coils for all major OEM spiral and tunnel freezers. We match exact casing dimensions, fan orifice positions, liquid supply/suction header orientations, and coil static pressure drops for zero-modification field retrofits.
Maximize seafood freezing throughput, eliminate defrost downtime, and ensure complete food hygiene compliance with CSTHEATEXCHANGER:
Custom Shrimp & Fish Fillet IQF Evaporator Coils (40 kW to 1,200 kW+)
Seamless AISI 316L Stainless Tubes with Marine AlMg3 or All-Stainless Steel Fins
Rapid 15–20 Minute Dual-Circuit Pan-First Hot Gas Defrost Systems
Progressive Variable Fin Pitch (20 mm→12 mm→6 mm) for 24h Uptime
Sanitary TIG-Welded Stainless Steel Casings with Double-Wall Insulated Sloped Drain Pans
Full ASME / CE PED Compliance, IP66 Washdown Axial Fans & Factory-Direct Global OEM Supply
Contact our specialized seafood refrigeration engineering department today with your product type (shrimp/fish fillet), hourly freezing capacity (kg/h), enclosure dimensions, refrigerant type, and evaporating temperature for custom CAD proposals and factory-direct quotations.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
