China Industrial IQF Evaporator Coil Manufacturer Factory | CSTHEATEXCHANGER

At CSTHEATEXCHANGER, we are a leading China Industrial IQF Evaporator Coil Manufacturer and Direct OEM/ODM Factory specializing in custom-engineered refrigeration coils for industrial continuous spiral freezers, fluidized bed IQF tunnels, blast freezing rooms, carton freezers, and plate freezers (refrigeration capacities manufactured from 30 kW to over 1,800 kW per evaporator unit, air delivery volumes from 10,000 m3/h to over 350,000 m3/h, operating at evaporating temperatures of −30∘C to −55∘C). Operating from our modern heat exchanger manufacturing plant in Changzhou, Jiangsu Province, China, we produce heavy-duty IQF coils across diverse metallurgy and refrigerant topologies—including Ammonia (NH3 / R717), Carbon Dioxide (CO2 / R744 up to 90 bar), Glycols, and Freon halocarbons—pairing seamless heavy-wall AISI 304/316L stainless steel, CuFe2P alloy, or deoxidized copper tubes with marine-grade AlMg3 aluminum or 100% all-stainless steel fins. Featuring advanced progressive variable fin spacing (16 mm / 20 mm inlet down to 8 mm / 6 mm discharge), dual-circuit rapid hot gas defrost systems, full sanitary TIG-welded stainless steel casings, and 100% helium mass spectrometer leak detection, CSTHEATEXCHANGER delivers certified, factory-direct OEM coils and drop-in replacements to freezer builders and food processors worldwide.

1. Manufacturing Capabilities: End-to-End IQF Coil Fabrication in Changzhou, China

As an integrated industrial heat exchanger manufacturing factory, CSTHEATEXCHANGER controls every stage of the coil fabrication process:

        CSTHEATEXCHANGER CHINA FACTORY IQF COIL FABRICATION WORKFLOW
        
   ======================= CNC PROGRESSIVE FIN PUNCHING LINE =======================
   [ High-Speed Stamping of Heavy AlMg3 / SS304 Fins with Variable Collar Heights ]
                               │
                               ▼
   ┌────────────────────────────────────────────────────────────────────────────┐
   │ [AUTOMATED TUBE BUNDLE CORE LACING & INSERTION]                            │
   │ • Precision CNC pattern lacing of seamless AISI 304/316L or CuFe2P tubes   │
   │ • Staged variable fin spacing matrix (20 mm inlet -> 12 mm -> 6 mm outlet) │
   └───────────────────────────┬────────────────────────────────────────────────┘
                               │
                               ▼
   ┌────────────────────────────────────────────────────────────────────────────┐
   │ [FULL MECHANICAL / HYDRAULIC BALL EXPANSION PROCESS]                       │
   │ • High-tonnage expansion mandrel creates permanent 100% metal-to-metal fit │
   │ • Zero contact resistance degradation over decades of thermal cycling      │
   └───────────────────────────┬────────────────────────────────────────────────┘
                               │
                               ▼
   ┌────────────────────────────────────────────────────────────────────────────┐
   │ [AUTOMATIC ORBITAL TIG WELDING & RADIOGRAPHIC INSPECTION]                  │
   │ • Cleanroom TIG welding of return bends & Schedule 80 stainless headers    │
   │ • 100% Helium mass spectrometer vacuum leak testing (Zero PPM leak standard│
   └───────────────────────────┬────────────────────────────────────────────────┘
                               │
                               ▼
   ======================= FINAL SANITARY CASING & ENCLOSURE ASSEMBLY =======================
   [ Heavy 3 mm AISI 304 Stainless Frame, Insulated Sloped Drain Pan & IP66 Fans ]

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CSTHEATEXCHANGER CHINA FACTORY ADVANTAGES VS. TRADITIONAL ASSEMBLY WORKSHOPS
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Manufacturing Parameter        Small Regional Assembly WorkshopCST China Direct Manufacturing Factory
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Tube & Fin Metallurgies        Limited (Standard Copper/Al only)Full Matrix: SS304, SS316L, AlMg3, CuFe2P
Refrigerant Compatibility      Freon only (Cannot handle NH3/CO2)NH3 Overfeed, High-Pressure CO2 (90 bar), Freon
Progressive Fin Pitch Tooling  Fixed Uniform Spacing (e.g. 10mm)Full Progressive Tooling (25/20/16/12/8/6 mm)
Expansion Technology           Manual Bullet Push (Uneven fit) Full Hydraulic & Mechanical Ball Expansion
Header Welding Quality         Manual Stick / MIG Welding      Automated Orbital TIG Welding with Purge
Casing Construction            Thin Galvanized Sheet (Corrodes)Continuous TIG-Welded 3.0 mm AISI 304/316L
Leak Detection Standard        Basic Submerged Bubble Test     100% Helium Mass Spectrometer Vacuum Testing
Pressure Vessel Certifications Lacks International Stamping    ASME Section VIII Div. 1, CE / PED Module H
Custom OEM / Drop-in Retrofit  Catalog-Only Fixed Sizes        100% Custom Tailored & Drop-In Replacement
================================================================================

1. Advanced Full Hydraulic & Mechanical Expansion Technology

Thermal contact resistance between tube and fin is the primary factor determining heat transfer efficiency. CST utilizes high-tonnage mechanical ball expansion, expanding heavy-wall stainless steel and copper tubes tightly into fin collars. This ensures a permanent 100% metal-to-metal interference fit that withstands daily thermal shock from −45∘C freezing down to +40∘C hot gas defrost cycles without fin loosening.

2. 100%100% Factory Helium Mass Spectrometer Leak Testing

To ensure zero risk of toxic ammonia or high-pressure CO2​ leaks inside food processing plants, every coil manufactured in our factory undergoes full vacuum evacuation and pressurized helium mass spectrometer leak detection (sensitivity up to 1×10−9 mbar⋅l/s) before shipment.

2. Complete Refrigerant & Metallurgy Matrix

        CSTHEATEXCHANGER REFRIGERANT & MATERIAL MATRIX
        
   ┌─────────────────────────────────────────────────────────────────────────┐
   │ [1. AMMONIA (NH3 / R717) IQF EVAPORATOR COILS]                          │
   │ • Tubes: Seamless AISI 304 / 316L Stainless Steel (5/8" or 3/4" OD)     │
   │ • Fins: Marine-Grade AlMg3 Aluminum Alloy (0.35–0.50 mm) or AISI 304 SS │
   │ • Feed: Liquid Overfeed Pump Circulation (3:1 to 4:1 ratio) / Gravity   │
   ├─────────────────────────────────────────────────────────────────────────┤
   │ [2. HIGH-PRESSURE CO2 (R744) TRAN思维CRITICAL / SUBCRITICAL COILS]     │
   │ • Tubes: High-Strength AISI 316L Stainless Steel or CuFe2P Alloy        │
   │ • Rating: Design pressures of 60 bar to 90 bar (Hydrostatic test 135 bar│
   │ • Feed: Direct Expansion (DX) or Pump Overfeed                          │
   ├─────────────────────────────────────────────────────────────────────────┤
   │ [3. FREON HALOCARBON (R404A / R507 / R448A) & GLYCOL AIR COOLERS]       │
   │ • Tubes: Deoxidized High-Conductivity Copper or Stainless Steel         │
   │ • Fins: Pure Aluminum, Hydrophilic Coated, or Epoxy Anti-Corrosion      │
   └─────────────────────────────────────────────────────────────────────────┘

3. Product Configurations: China Factory Direct IQF Solutions

        CSTHEATEXCHANGER INDUSTRIAL IQF COIL PORTFOLIO
        
   [1. CONTINUOUS SPIRAL FREEZER EVAPORATOR BANKS]
   • Single drum, double drum, and self-stacking spiral freezer coils up to 1,800 kW.
   • Features staged 20 mm -> 12 mm -> 6 mm fin pitch for 24-hour continuous glazing runs.
   ─────────────────────────────────────────────────────────────────────────────
   [2. FLUIDIZED BED IQF TUNNEL FREEZER COILS]
   • High-static vertical aeration coils for individually quick-frozen berries, peas, and shrimp.
   • Heavy 0.45 mm AlMg3 fins withstand high-frequency aerodynamic pulsations.
   ─────────────────────────────────────────────────────────────────────────────
   [3. MULTI-BELT TUNNEL CRUST FREEZER & BLAST FREEZING AIR COOLERS]
   • High-velocity blast evaporator blocks for meat carton, poultry, and bakery crusting.

4. Technical Specifications — Industrial IQF Evaporator Coils

(Note: The following engineering parameters represent standard manufacturing design envelopes. Tube metallurgy, progressive fin pitch stages, fan static pressures, and casing dimensions are customized to specific food processing plant drawings.)

================================================================================
CSTHEATEXCHANGER INDUSTRIAL IQF EVAPORATOR COIL (CST-IQF-IND SERIES)
================================================================================
Engineering Parameter           Standard Manufacturing & Design Range
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Thermal Refrigeration Capacity  30 kW to 1,800+ kW per coil block (Scalable)
Air Delivery Flow Volumes       10,000 m³/h to 350,000+ m³/h (5,800 to 206,000+ CFM)
Operating Evaporating Temp.     -30°C to -55°C (-22°F to -67°F) Ultra-Low Temp
Compatible Refrigerants         NH3 (R717 Overfeed / DX), CO2 (R744 up to 90 bar), R404A, R507
Progressive Fin Pitch Staging   Inlet: 16–25 mm -> Intermediate: 10–14 mm -> Discharge: 6–8 mm
Tube Metallurgy Options         Seamless AISI 304, AISI 316L Stainless Steel, CuFe2P, Copper
Tube Diameter & Wall Thickness  3/8", 1/2", 5/8", or 3/4" OD; Wall: 0.8 mm to 1.5 mm
Fin Material Options            Marine-Grade AlMg3 Aluminum Alloy, Pure Al 1050, AISI 304/316L SS
Fin Thickness Range             0.30 mm to 0.50 mm (Heavy gauge for high-pressure CIP washdown)
Tube-Fin Mechanical Bonding     Precision High-Tonnage Mechanical Ball Expansion (100% Fit)
Casing & Structural Frame       Continuous TIG-Welded AISI 304 or AISI 316L Stainless Steel (3 mm)
Drain Pan Configuration         Double-Wall Insulated Stainless Steel Pan with 3° Slope
Defrosting Methods              Rapid Dual-Circuit Hot Gas (Pan-First Loop), Water Spray, Electric
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 Module H, ISO 9001
Testing & Quality Assurance     100% Helium Mass Spectrometer Vacuum Testing (Zero Leak Standard)
================================================================================

5. Frequently Asked Questions (FAQ)

What distinguishes CSTHEATEXCHANGER as an industrial IQF evaporator coil manufacturer in China?

Unlike small assembly workshops, CSTHEATEXCHANGER operates full CNC progressive fin stamping lines, automated orbital TIG welding, and high-tonnage mechanical ball expansion tooling. We manufacture complete metallurgy matrices—including ammonia (NH3​) and high-pressure CO2 (90 bar) coils—and enforce 100% helium mass spectrometer vacuum leak testing with full ASME and CE PED certification.

Can CSTHEATEXCHANGER manufacture drop-in replacement coils for existing spiral and tunnel freezers?

Yes. We regularly design and manufacture 100% dimensional drop-in replacement evaporator coils for major industrial spiral and tunnel freezer brands worldwide. Our engineering team matches exact enclosure mounting dimensions, fan orifice positions, refrigerant supply/suction header locations, and coil static pressure drops for seamless field retrofits with zero structural modifications.

How does progressive variable fin spacing extend continuous freezing production time?

In high-moisture freezing (poultry, shrimp, berries), over 70% of moisture drops out on 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 entering face. The fin spacing then tightens to 6–8 mm at the discharge, extending continuous defrost-free freezing runs to 16–24+ hours.

Source Direct from CSTHEATEXCHANGER — China IQF Evaporator Coil Factory

Partner with CSTHEATEXCHANGER for factory-direct engineering, competitive pricing, and certified reliability:

• Custom Industrial IQF Evaporator Coils (30 kW to 1,800 kW+)

• Ammonia (NH3​), Carbon Dioxide (CO2​ up to 90 bar), and Freon Coils

• Progressive Variable Fin Pitch (20 mm→12 mm→6 mm) for 24h Uptime

• Heavy AISI 304/316L Stainless Tubes with Marine AlMg3 or All-Stainless Steel Fins

• Sanitary TIG-Welded Stainless Steel Casings with Double-Wall Insulated Sloped Drain Pans

• Full ASME / CE PED Compliance, 100% Helium Leak Tested & Global Direct OEM Delivery

Contact our specialized refrigeration engineering department today with your product type, 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