Complete low-temperature processing workshop design (0°C fresh-keeping / -18°C quick-freezing / -35°C deep-freezing, compatible with ammonia/CO₂ natural refrigerants, drive-through racking + dock loading system)
I. Workshop Zoning & Layout (Applicable to prepared foods, aquatic products, and meat)
1. Ambient Pre-treatment Area (15–22°C): Raw material sorting, washing, cutting
2. Pre-cooling Room (0–4°C): Rapid product cooling, temperature-controlled fresh-keeping
3. Low-temperature Fine Processing Room (-5–10°C): Forming, portioning, inner packaging
4. Quick-freezing Room (-35°C to -40°C): Plate freezing / tunnel freezing
5. Finished Product Low-temperature Storage (-18°C): Drive-through racking for finished goods, forklift access
6. Dock Loading Area: Sealed loading positions, complete with dock seals + insulated lifting doors + hydraulic dock levelers
II. Building Envelope & Insulation Structure (Critical for low temperature, preventing cold bridges, condensation, and cold air leakage)
1. Wall/Roof Panels: 100/150/200mm polyurethane insulated sandwich panels (flame-retardant B1 grade, density ≥42kg/m³); 200mm panels for deep-freezing rooms;
2. Floor: C30 frost-resistant concrete floor + polyurethane moisture-proof vapor barrier layer, preventing frost cracking and supporting heavy forklift loads; quick-freezing areas equipped with frost-resistant expansion joints;
3. Vapor Barrier Process: Full coverage of walls and ceiling with PE vapor barrier film to prevent moisture from entering the insulation layer and causing blistering.
III. Door Configuration (Section-specific selection)
1. Exterior Dock Doors: 50mm thickened insulated industrial overhead lifting doors, paired with foam/inflatable dock seals + hydraulic dock levelers for sealed loading/unloading of entire vehicles;
2. Internal Partition Doors: Zipper-type low-temperature insulated high-speed roll-up doors
- Between fine processing/pre-cooling: 100mm insulated PVC zipper high-speed doors, rapid open/close for frequent forklift traffic, locking in cold air;
- Quick-freezing room access: Cold-resistant anti-freeze model, with track heating cables, preventing door freezing at low temperatures.
IV. Refrigeration System (Two Eco-friendly Mainstream Options)
1. Ammonia + CO₂ Cascade System (Preferred for large low-temperature workshops)
- Only liquid ammonia stored in the machine room; all CO₂ piping enters the cold rooms, ensuring non-toxic and safe storage areas, compliant with new safety regulations;
- Stable operation at -35°C for quick-freezing and -18°C for cold storage, with low operating energy consumption and low refrigerant cost.
2. Full CO₂ Transcritical/Cascade System (For small to medium workshops, clean food processing, and pharmaceutical applications)
- Ammonia-free throughout, A1 safety refrigerant, no mandatory explosion-proof machine room, and capable of waste heat recovery to produce hot water for cleaning workshop equipment.
End Heat Exchange
Fine processing/pre-cooling: Ceiling-mounted unit coolers; Quick-freezing room: Floor-standing freezing evaporators, plate freezing equipment.
V. Ancillary Energy-saving Accessories
1. Air Curtains: Low-temperature hot air curtains installed at door openings to block hot/cold air convection and reduce cold loss;
2. Dehumidification System: Optional dehumidification units for low-temperature, high-humidity areas to reduce frost formation and minimize evaporator defrosting energy consumption;
3. Impact Protection: Polyurethane impact protection barriers at wall corners, rack protective posts, and forklift guards.
VI. Storage Solutions
Finished goods storage area equipped with drive-through racking or heavy-duty beam racking for full-pallet storage and electric forklift operation; for large-volume batch storage, drive-through dense storage is preferred to maximize capacity.
VII. Quick Temperature Zone Selection Reference
