Key Engineering Takeaways
The insulated envelope represents 30% to 35% of total initial capital expenditure (CAPEX) but governs over 60% of continuous electrical operational expenditure (OPEX) across 20 years of plant life. Tan Long is one of Vietnam's premier manufacturers operating continuous European-standard automated sandwich panel production lines:
- Core Insulation Options: Fire-retardant B1/B2 PIR, high-density 42 kg/m³ PUR, and economical EPS.
- Joint Fastening System: Pre-cast internal eccentric Camlocks embedded within the foam core, tightened via hex key for 99.9% vapor-tight seams.
- Manufacturing Output: Over 3,000 m²/day at Duc Hoa 1 Industrial Park, with continuous panel lengths up to 15 meters without horizontal lap joints.
- Factory-Direct Pricing: Saves 15% to 20% by eliminating commercial distributors for HVAC-R contractors and industrial enterprise owners.
Cold Storage Insulated Panels Technical Index
- Composition & Comparison: PIR vs. PU vs. EPS Core Materials
- Why Pre-Cast Camlocks Outperform Traditional Z-Lock Joints
- Factory-Direct 2026 Insulated Panel Price Quotation Matrix
- Engineering Formula for Panel Thickness vs. Storage Temperature
- 6-Step Certified Cold Room Panel Erection Protocol
- Critical Operational Risks of Secondhand Salvaged Panels
- 15 In-Depth Engineering FAQs on Cold Storage Panels (FAQs)
1. Composition & Technical Comparison: PIR vs. PU vs. EPS
To specify the optimal panel for your facility, understanding the thermodynamic, mechanical, and fire-resistant characteristics of each core material is vital:
| Technical Specifications | Panel PIR (Polyisocyanurate) | Panel PU (Polyurethane) | Panel EPS (Polystyrene) |
|---|---|---|---|
| Thermal Conductivity (λ) | 0.019 - 0.021 W/m.K (Industry Benchmark) | 0.022 - 0.024 W/m.K | 0.038 - 0.040 W/m.K |
| Core Foam Density | 42 - 45 kg/m³ | 40 - 42 kg/m³ | 18 - 25 kg/m³ |
| Fire Retardancy Rating | B1/B2 Class (Self-Extinguishing, Zero Flame Spread) | B3 Class (Slow Burning) | Combustible, Molten Droplet Hazard |
| Closed-Cell Content Ratio | > 95% (100% Vapor Impermeable) | > 92% | Expanded Bead Lattice (Prone to Water Infiltration) |
| Operating Temperature Range | -60°C to +150°C | -50°C to +100°C | -10°C to +70°C |
| Joint Locking Mechanism | Tongue-and-groove Camlock | Tongue-and-groove Camlock | Z-lock tongue-and-groove |
| Recommended Application | Ultra-low blast freezers, fire-rated cold storage | Seafood blast freezers, HACCP cool rooms | Produce cool rooms, plant partition walls |
2. Why Pre-Cast Camlocks Outperform Traditional Z-Lock Joints
In industrial refrigeration engineering, inter-panel joints are the most susceptible locus for thermal bridging if not detailed with precision joinery.
Conventional installation using plain Z-locks or tongue-and-groove joints requires field crews to drive hundreds of self-tapping screws directly through the steel skin. These metal screws serve as thermal bridges conducting heat from ambient into the sub-zero chamber, provoking condensation sweating and rust streaking within 6 months.
Conversely, Embedded Camlock Fasteners engineered by Tan Long definitively resolve this thermal bridge defect:
- Evenly Distributed Mechanical Clamping Force: Rotating an Allen wrench 180° engages the high-tensile steel eccentric hook into the opposing pin, drawing panel edges together with hundreds of kilograms of compressive force to crush the dual EPDM bulb gaskets.
- Elimination of Thermal Leakage: Zero metal fasteners penetrate the exterior facing sheet, yielding a completely flush hygienic plane compliant with GMP/HACCP criteria.
- 100% Non-Destructive Demountability: When operations relocate or expand facility footprints, technicians simply reverse the hex key to unlock the Camlocks, disassembling undamaged panels ready for 100% reuse.
3. Factory-Direct Cold Storage Panel Price Matrix (2026)
Below is the reference factory-gate quotation matrix at Duc Hoa 1 Industrial Park, Long An (Based on 0.45mm food-grade antibacterial pre-painted steel skins):
| Panel Category | Core Thickness (mm) | Core Density (kg/m³) | Operating Temperature Envelope | Factory Gate Price (VND/m²) |
|---|---|---|---|---|
| Pre-painted EPS Panel | 50 mm | 18 - 20 kg/m³ | +10°C to +20°C | 165,000 - 185,000 VND |
| Pre-painted EPS Panel | 75 mm | 18 - 20 kg/m³ | +5°C to +15°C | 210,000 - 235,000 VND |
| Pre-painted EPS Panel | 100 mm | 20 - 22 kg/m³ | 0°C to +10°C | 260,000 - 290,000 VND |
| PU Camlock Insulated Panels | 75 mm | 40 - 42 kg/m³ | +2°C to +10°C | 380,000 - 420,000 VND |
| PU Camlock Insulated Panels | 100 mm | 40 - 42 kg/m³ | -5°C to -18°C | 460,000 - 510,000 VND |
| PU Camlock Insulated Panels | 125 mm | 40 - 42 kg/m³ | -18°C to -25°C | 550,000 - 610,000 VND |
| Camlock PIR Panel (Fire Class B1) | 100 mm | 42 - 45 kg/m³ | -10°C to -22°C | 520,000 - 580,000 VND |
| Camlock PIR Panel (Fire Class B1) | 125 mm | 42 - 45 kg/m³ | -18°C to -28°C | 620,000 - 690,000 VND |
| Camlock PIR Panel (Fire Class B1) | 150 mm | 42 - 45 kg/m³ | -25°C to -40°C | 720,000 - 780,000 VND |
| Ultra-Low Temp Camlock PIR Panel | 175 - 200 mm | 42 - 45 kg/m³ | -40°C to -60°C | Contact Us for Project Quotation |
4. Engineering Guidelines: Panel Thickness Selection by Room Temperature
In industrial refrigeration design, panel thickness selection must satisfy the condition of zero outer surface condensation sweating. Fundamental steady-state heat conduction formula through flat multilayer walls:
Q = k × F × (t_outdoor - t_indoor) [W]
Where: k = 1 / [ (1/alpha_out) + Σ(delta_i / lambda_i) + (1/alpha_in) ]
To maintain envelope heat transmission flux q <= 8 - 10 W/m² (the economic optimal threshold for cold storage), Tan Long engineers recommend this sizing matrix:
- Temperature Differential Δt ≤ 15°C (Chilled room +10°C): Minimum PIR thickness 50mm, minimum EPS thickness 75mm.
- Temperature Differential Δt = 25 - 35°C (Cool room 0°C to +5°C): Minimum PIR thickness 75mm - 100mm, minimum EPS thickness 100mm.
- Temperature Differential Δt = 50 - 60°C (Freezer room -18°C to -25°C): Minimum PIR/PU thickness 125mm - 150mm.
- Temperature Differential Δt > 70°C (Blast freezers -40°C to -60°C): Mandatory 175mm - 200mm Camlock PIR panels.
5. 6-Step Certified Cold Storage Panel Erection Protocol
6. Critical Operational Risks of Buying Salvaged Secondhand Panels
Tan Long Brand-New Factory-Direct Panels
- 100% virgin PIR/PU foam core, 42 kg/m³ density, superior elasticity.
- BlueScope antibacterial pre-painted steel facings, mirror-flat finish.
- Factory-embedded Camlocks, 99.9% airtight seal, 100% reusable.
- 10-Year thermal warranty, complete CO/CQ and fire safety dossiers.
Severe Pitfalls of Secondhand Salvaged Panels
- Degraded foam core, moisture absorption, 50% loss in thermal resistance.
- Corroded steel skins, paint peeling, fungal traps violating HACCP.
- Corroded Camlocks, jammed mechanisms, incapable of airtight clamping.
- Chronic outer envelope condensation sweating, continuous compressor overload doubling power bills.
7. QCVN 06:2022/BXD Fire Safety Standards for PIR Panels
National Technical Regulation on Fire Safety for Buildings (QCVN 06:2022/BXD and Circular 09/2023/TT-BXD) enforces stringent statutory requirements on industrial building envelopes. Uncertified panels routinely fail fire audits, triggering operational halts costing billions of VND:
a. Self-Extinguishing Mechanism & Protective Carbonaceous Char of Tan Long PIR
Unlike EPS (which liquefies at 90°C to 110°C and burns vigorously with toxic black smoke), high-performance Polyisocyanurate (PIR) is synthesized via condensation reaction between Polyol and Isocyanate at an Index ratio exceeding 250, forming an exceptionally stable 3D cross-linked Isocyanurate ring network:
Carbonaceous Charring Barrier Mechanism
Upon exposure to direct flame up to 1,000°C, the PIR surface instantly pyrolyzes into a micro-ceramic porous carbon char layer. This inert barrier starves the fire of oxygen, prevents thermal propagation into the inner foam core, and self-extinguishes immediately when the flame source is removed.
Ultra-Low Flame Spread & Smoke Developed Indices (FSI & SDI)
Tan Long PIR panels achieve ASTM E84 Class A international fire certification with Flame Spread Index FSI <= 25 and Smoke Developed Index SDI <= 450. The combustion gases are free of hydrogen cyanide, providing maximum escape time for warehouse personnel.
b. Permissible Ceiling Panel Span Lengths & Distributed Load Capacity
When engineering suspended cold room ceilings, calculating the permissible span (L) between suspension purlins is crucial to structural safety, preventing panel deflection when engineers traverse roof decks for pipe maintenance:
| Insulated Panel Thickness | Foam Core Density | Max Clear Span Without Hanger Rods | Permissible Span With Turnbuckle Hangers | Allowable Safe Load (kg/m²) |
|---|---|---|---|---|
| Panel PIR 75 mm | 42 - 45 kg/m³ | 3.200 mm (3.2 m) | 6,000 mm (2-span configuration) | 120 kg/m² |
| Panel PIR 100 mm | 42 - 45 kg/m³ | 4.500 mm (4.5 m) | 7.500 mm | 150 kg/m² |
| Panel PIR 125 mm | 42 - 45 kg/m³ | 5.200 mm (5.2 m) | 8.500 mm | 180 kg/m² |
| Panel PIR 150 mm | 42 - 45 kg/m³ | 6.000 mm (6.0 m) | 10.000 mm | 220 kg/m² |
| Panel PIR 200 mm | 42 - 45 kg/m³ | 7.500 mm (7.5 m) | 12.000 mm | 280 kg/m² |
c. Seam Sealing Technology: Anti-Fungal Silicone & Vapor-Proof Butyl Mastic Tape
During cold room envelope installation, seam detailing at tongue-and-groove joints governs 80% of project airtightness. Broken sealant beads or acidic sealants that corrode zinc coatings will allow humidity into sub-zero chambers, freezing into ice wedges that fracture Camlocks:
- Dual Zig-Zag Neutral Silicone Injection: Prior to Camlock engagement, technicians must lay two continuous beads of low-temperature neutral silicone (such as Dow Corning 732 or Dowsil Neutral Plus) along both tongue and groove profiles. Acetic-acid-free formulations eliminate zinc corrosion and staining.
- Permanent Elastic Butyl Tape Base Barrier: At the junction between panel feet and floor aluminum U-channels, Tan Long installs 3mm solid butyl sealant tape. Butyl provides tenacious adhesion and permanent elasticity down to -40°C without embrittlement or shrinkage over time.
- Fastening with EPDM Washer Stainless Screws: Fastener pitch securing aluminum corner coves must not exceed 250mm, with every screw head capped in silicone to prevent moisture penetration.
