Air Blast Freezing Tunnel

Tan Long high-capacity blast freezing tunnels deliver industrial batch freezing from 2 to 20 tons per cycle. Featuring aerodynamic forced convection air routing at -40°C to -45°C through multi-tier trolley racks, reducing core freezing duration to under 4 to 8 hours.

Air Blast Freezing Tunnel: Air blast freezing tunnels are engineered for whole fish, meat blocks, and poultry. High-pressure axial fans circulate -40°C air at 5-6 m/s across trolleys and trays, slashing freezing cycle time down to 4-6 hours per batch while preventing cellular ice crystal damage.

For bulky or trolley-loaded commodities such as whole durians, oceanic tuna, slaughtered pork/beef carcasses, or tray-packaged foods, continuous IQF tunnels cannot accommodate the load. Tan Long blast freezing tunnels provide the premier heavy-duty solution, pairing oversized flooded/DX evaporators with high-static axial fans to drive core temperatures down to -18°C rapidly, preventing spoilage and moisture loss.

Blast Freezing Chamber Cấp Tốc Blast Freezer Tunnel: Giải Pháp Cấp Đông Khối Lượng Lớn — Industrial high-capacity blast freezing tunnel constructed by Tan Long for agro-seafood processing facility

Tan Long Factory Standard Technical Specifications Matrix

Freezing Capacity per Batch	2 Tons, 5 Tons, 10 Tons, 20 Tons per batch
Chamber Operating Temperature	-35°C to -42°C
Freezing Retention Time	4 to 8 hours per batch (depending on product size)
Wall & Ceiling Enclosure	150mm - 200mm high-density PU panels (42 kg/m³)
Blast Evaporator Coil	Hot-dip galvanized steel or stainless tube coils with 12-16mm fin spacing
Circulation Airflow Fans	High-static fans delivering 40,000 to 80,000 m³/h air volume
Blast Chamber Doors	T-Light heavy sliding doors with 4-side perimeter heater cables
Refrigerants	High-efficiency natural Ammonia (NH3) or Freon R507A

Get 2026 Equipment Quotation Download Technical Catalog (PDF)

1. Forced Convective Aerodynamic Airflow Engineering

The decisive factor in blast tunnel performance is airflow direction and velocity. Tan Long utilizes CFD aerodynamic modeling to optimize false-ceiling baffles and high-static fans:

• Forced sub-zero air (5 to 8 m/s) sweeps uniformly through crate gaps on each trolley tier.

• Prevents airflow short-circuiting over trolley tops without penetrating product cores.

• Holds temperature differential across all chamber positions within ±1.5°C.

2. Specialized Blast Freezing for Durian Export Compliance

With Vietnamese fresh durian securing official export protocols to China, demand for frozen whole and pulp durians has surged. Tan Long blast tunnels freeze durian pulp in 4 hours and whole fruit in 8 hours, preserving vibrant golden color, creamy texture, and aromatics without thaw weeping.

3. Automated Core Product Temperature Telemetry

The system integrates wireless core temperature probes interfacing directly with the PLC automation switchboard. When core temperatures hit target -18°C, the system shifts automatically to holding mode or dispatches operator alerts, eliminating wasteful redundant power draw.

Competitive Advantages & Market Comparison Matrix

Technical comparison between genuine Tan Long refrigeration equipment manufactured at Duc Hoa 1 Industrial Park versus substandard market alternatives:

Tan Long Equipment Advantages

✓ Cross-flow aerodynamic design distributing uniform air across 100% of trolley trays
✓ Two-stage Mycom/Bitzer compound screw racks saving 25% electrical energy compared to single-stage units
✓ Reinforced concrete slabs engineered for heavy trolley loads and protected against sub-zero frost cracking
✓ Automated hot gas defrost system clearing coil frost in just 20 minutes

Drawbacks of Manual / Used Imported Systems

✗ Crude air routing freezes entrance trolleys while rear racks fail to pull down to temperature
✗ Low-density PU panels sweat condensation and frost over, causing heavy continuous heat infiltration
✗ Narrow fin pitch evaporators freeze solid in 2 hours, reducing cooling capacity by 50%
✗ High monthly operational power bills caused by undersized single-stage compressors running overloaded

Frequently Asked Questions (FAQs) by Engineers & Investors

Q1: What food commodities can be processed in a blast freezing tunnel?

Blast tunnels are exceptionally versatile: export whole/pulp durians, dragon fruit, jackfruit, bananas; poultry and pork carcasses; whole marine fish (tuna, seabass, squid); and packaged prepared foods like spring rolls and dim sum.

Q2: What is the electrical running cost for a 5-ton blast freezing tunnel?

Utilizing high-COP two-stage Bitzer/Mycom compound screw compressors with VFD inverters, energy consumption averages just 350 to 480 kWh per 5-ton batch, delivering 25% power savings over legacy installations.