Editorial Technical Reference

Insulated Freezing Tunnel

This page explains how Insulated Freezing Tunnel is classified within Food Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The insulated enclosure that houses the cryogenic freezing process within an automated fish freezing system.

Insulated Freezing Tunnel in a manufacturing environment
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Insulated Freezing Tunnel

Definition
The Insulated Freezing Tunnel is a critical component of the Automated Cryogenic Fish Freezing Tunnel System. It is a thermally insulated enclosure designed to maintain extremely low temperatures required for rapid cryogenic freezing of fish products. The tunnel provides a controlled environment where fish are exposed to cryogenic gases, typically liquid nitrogen or carbon dioxide, while being transported on a conveyor system, ensuring uniform freezing and preservation of product quality. Constructed with high-performance insulation materials, the tunnel minimizes thermal transfer between the internal cryogenic environment and the external surroundings. The inner lining is made of stainless steel (grade 304, per ASTM A240), which is food-grade and corrosion-resistant. The insulation layer consists of polyurethane foam or polyisocyanurate (PIR) with a thickness of 150–200 mm, offering high thermal resistance and meeting fire class B2 per DIN 4102. The outer casing is also stainless steel (grade 304) for hygiene and durability. The tunnel is available in custom sizes, with standard internal dimensions of 1200×1200×6000 mm (W×H×L). It operates within a temperature range of -40°C to -35°C, with a temperature uniformity of ±3°C to ensure consistent freezing quality. Cooling capacity ranges from 50 to 200 kW, depending on product load and inlet temperature. Electrical supply is 380–480 V AC, three-phase, 50/60 Hz, per IEC 60038. Power consumption, including fans, controls, and defrost, is 15–45 kW. The enclosure has an IP rating of IP54–IP65 per IEC 60529, protecting against dust and water jets. Weight ranges from 1500 to 3000 kg, and the footprint is 6500×1500 mm (L×W), with clearance for maintenance. All listed values are reference ranges and must be verified with the manufacturer for specific models and applications.
Working Principle
The tunnel uses high-performance insulation materials to minimize thermal transfer between the internal cryogenic environment and the external surroundings. As fish enter the tunnel on a conveyor, they are exposed to cryogenic gases that rapidly extract heat through direct contact and convection. The insulated walls maintain the low temperature gradient, allowing for efficient freezing with minimal energy loss. The insulation thickness and material are selected to achieve the required thermal resistance, while the stainless steel lining ensures food safety and corrosion resistance. The design ensures uniform temperature distribution, critical for consistent product quality.
Common Materials
Stainless steel (inner lining), Polyurethane foam insulation, Galvanized steel (outer casing)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Internal Dimensions (W×H×L)1200×1200×6000 mmCustom sizes available
Operating Temperature Range-40–-35 °CBelow -40°C may cause excessive energy consumption
Temperature Uniformity±3 °CEnsures consistent freezing quality
Cooling Capacity50–200 kWDepends on product load and inlet temperature
Insulation Thickness150–200 mmPU foam, high thermal resistance
Insulation MaterialPIRFire class B2, low thermal conductivityDIN 4102
Internal Lining Material304 SSFood-grade, corrosion-resistantASTM A240
External Casing Material304 SSStainless steel for hygieneASTM A240
Electrical Supply380–480 V AC3-phase, 50/60 HzIEC 60038
Power Consumption15–45 kWIncludes fans, controls, and defrost
IP RatingIP54–IP65Protected against dust and water jetsIEC 60529
Weight1500–3000 kgDepends on size and insulation thickness
Footprint (L×W)6500×1500 mmAdd clearance for maintenance

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Insulated Wall Panels
    Form the primary thermal barrier of the tunnel structure
    Material: Stainless steel with polyurethane core
  • Access Doors
    Provide entry points for maintenance and inspection while maintaining thermal integrity
    Material: Insulated stainless steel
  • Observation Windows
    Allow visual monitoring of the freezing process without thermal compromise
    Material: Multi-layer insulated glass
  • Sealing Gaskets Part
    Ensure airtight seals at panel joints and access points to prevent thermal leakage
    Material: Silicone rubber

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 0.5 bar gauge (positive pressure for inert gas purge)
other spec: Slurry concentration: 10-40% solids by weight, Flow rate: 0.5-5 m/s belt velocity
temperature: -196°C to -40°C (LN2 or CO2 cryogenic range)
Media Compatibility
✓ Marine water with salt content up to 3.5% ✓ Food-grade stainless steel (316L) contact surfaces ✓ Polyurethane foam insulation with vapor barrier
Unsuitable: Chlorinated water or high-acid environments (pH <4.0)
Sizing Data Required
  • Maximum product throughput (kg/hour)
  • Initial product temperature and target core temperature
  • Available floor space and ceiling height constraints

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Insulation Degradation
Cause: Thermal cycling and moisture ingress leading to reduced thermal efficiency, increased energy consumption, and potential ice formation on external surfaces.
Compressor System Failure
Cause: Refrigerant contamination, oil breakdown, or mechanical wear in the refrigeration circuit due to improper maintenance, leading to loss of cooling capacity.
Maintenance Indicators
  • Unusual increase in energy consumption or extended freezing times
  • Audible compressor strain, excessive vibration, or frost accumulation on non-insulated surfaces
Engineering Tips
  • Implement regular thermal imaging inspections to detect insulation gaps and moisture ingress early
  • Establish a preventive maintenance schedule for refrigerant purity analysis and compressor lubrication system checks

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 23953-2: Refrigerated display cabinets - Part 2: Classification, requirements and test conditions ANSI/ASHRAE 15: Safety Standard for Refrigeration Systems EN 378: Refrigerating systems and heat pumps - Safety and environmental requirements (CE marking basis)

Quoted from the published standard.

Manufacturing Precision
  • Insulation thickness: +/- 5% of specified dimension
  • Temperature uniformity: +/- 1.5°C across tunnel length
Quality Inspection
  • Leak testing of refrigerant circuits (pressure decay or bubble test)
  • Thermal performance verification (temperature mapping test)

Manufacturers of Insulated Freezing Tunnel

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Frequently Asked Questions

What is the operating temperature range of the Insulated Freezing Tunnel?

The standard operating temperature range is -40°C to -35°C. However, note that operating below -40°C may cause excessive energy consumption. Always verify the specific range for your model with the manufacturer.

What materials are used in the construction?

The inner lining is stainless steel grade 304 (ASTM A240), the insulation is polyurethane foam or PIR (polyisocyanurate) with a thickness of 150–200 mm, and the outer casing is also stainless steel grade 304. These materials provide food-grade hygiene and thermal efficiency.

What are the electrical requirements?

The tunnel requires a three-phase electrical supply of 380–480 V AC, 50/60 Hz, per IEC 60038. Power consumption, including fans, controls, and defrost, ranges from 15 to 45 kW. Confirm the exact requirements with the manufacturer.

How is temperature uniformity maintained?

The tunnel is designed to maintain a temperature uniformity of ±3°C, ensuring consistent freezing quality. This is achieved through the insulation design and the controlled flow of cryogenic gases. For specific performance, consult the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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