Cold-room Air Conditioner

Introduction:

The cold-room air conditioner is specially designed for cooling in cold-rooms to maintain low temperatures within insulated spaces, commonly used for storage of perishable goods. The temperature is the most important figure of the the cold-room AC. It can be 0°C to +10°C unit just for cold storage or keep fresh of goods, or -18°C to -30°C refrigeration units for freezing goods.

0°C to +10°C AC Units for Keeping Fresh:

Power Supply: 220V / 380V
Cooling Capacity: 3–8 kW for a small cold room 20–50 m³
Refrigerant: R404A, R134a, or R448A (eco-friendly options)
Noise Level: ≤55 dB (outdoor unit)

Keep Fresh:
- 0°C to +10°C (typically +2°C to +8°C for most fresh produce)
- For keeping products fresh (like fruits, vegetables, flowers, dairy, beverages, or fresh meat), the cold-room air conditioner is designed to maintain chilled (not frozen) conditions.
Humidity Control
- Maintains 85–95% relative humidity to prevent dehydration of products.
- Important for leafy vegetables, fruits, and flowers.
Stable Temperature
- Uses high-precision thermostats and microprocessor control to avoid temperature fluctuations.
Energy Efficiency
- Equipped with inverter or scroll compressors for energy savings.
- Optimized airflow design for uniform cooling.
Food-Grade Design
- Anti-corrosion materials, washable panels, and food-safe coatings.
Optional Functions
- Fresh air exchange to control CO₂ levels (for fruits & vegetables).
- Ethylene filters for fruit and flower preservation.
- Remote monitoring for temperature logging and alarms

-18°C to -30°C AC Units for Freezing:

Cooling Capacity: 4–10 kW for a samll Freezer Cold Room 20–50 m³
Power Supply: 380V 3-phase
Refrigerant: R404A or R507
Noise Level: ≤65 dB (outdoor unit)
For Freezing
- -18°C to -30°C (some applications go down to -40°C for deep freezing) for meat, seafood, poultry, bakery products, Ice cream & frozen desserts, Pharmaceutical & vaccine storage (ultra-low temp), Cold chain logistics hubs, etc.
High-Capacity Compressors
- Uses semi-hermetic or screw compressors for continuous low-temperature operation.
- Multi-stage or cascade systems for very low temperatures.
Powerful Insulation
- Requires thicker insulation panels (100–150 mm PU/PIR panels) to minimize heat gain.
- Doors with heated frames to prevent frost buildup.
Defrost System
- Electric or hot gas defrost to prevent evaporator coil icing.
Humidity & Frost Control
- Humidity levels are lower than in fresh cold rooms (to prevent ice build-up and maintain frozen state).
Heavy-Duty Components
- Evaporators with high airflow fans and anti-corrosion coatings.
- Heavy-duty condensing units, often air-cooled or water-cooled.
Energy Optimization
- Use of inverter technology, variable-speed fans, and eco-friendly refrigerants like R404A, R507, or CO₂ (R744).

How to Customize Your AC?

Customizing an air conditioner for a cold-room project involves tailoring the refrigeration system to meet specific temperature, humidity, load, and operational requirements of the client. It’s more than just selling a standard unit—suppliers often design a turnkey solution. Yes, we can also provide complete cold Rooms with air conditioning installed. Please check out the following steps for customized your cold-room ACs.

1. Project Requirement Collection

Purpose of cold room: fresh keeping (0~+10°C) or freezing (-18~-30°C)
Room size: length × width × height
Insulation thickness & material: PU/PIR panels (50–150 mm depending on temperature)
Location: indoor/outdoor climate, altitude (affects compressor selection)
Power supply: 220V single-phase or 380V three-phase
Operation mode: continuous / intermittent; single or multiple rooms

2. Load Calculation

We calculate the total heat load, which includes:

Product load (type, mass, temperature in/out)
Infiltration load (air leakage, door opening frequency)
People & lighting load
Heat transmission through walls, ceiling, floor

Example formula (simplified):
Q=Q1+Q2+Q3+Q4Q = Q_1 + Q_2 + Q_3 + Q_4Q=Q1+Q2+Q3+Q4
Where:

Q₁: Heat from product cooling/freezing
Q₂: Heat through structure (U × A × ΔT)
Q₃: Air exchange infiltration
Q₄: Miscellaneous (lighting, people, equipment)

3. Selection & Design

Compressor Unit: Select type (scroll, semi-hermetic, screw) & capacity
Evaporator: Airflow design to ensure uniform cooling
Refrigerant: R404A, R507, R448A, CO₂ (for low-GWP options)
Condenser: Air-cooled or water-cooled based on site conditions
Controls: Temperature controllers, sensors, defrost timers, remote monitoring
Optional features: humidity control, ethylene filter (for fresh produce), dual-temperature systems

4. Custom Engineering & Manufacturing

Build condensing units & evaporators per load calculation
Add special coatings (anti-corrosion for coastal areas, food-safe coatings inside room)
Integrate PLC or IoT monitoring if required
Provide customized electrical panels with overload, phase protection

5. Installation & Commissioning

Layout optimization for airflow & service space
Field piping (copper or stainless steel)
Electrical wiring & controls integration
Testing: vacuum, refrigerant charging, performance test, leak check
Training for operators

6. After-Sales Support

Spare parts supply
Maintenance contracts (especially for low-temperature systems)
Remote monitoring & troubleshooting options