Air Cargo Temperature Control
Passive vs Active Cooling: How to Choose the Right Solution for Temperature-Sensitive Cargo
Introduction
Shipping temperature-sensitive cargo by air requires careful planning and selecting the right cooling solution. This guide will help you understand the difference between passive and active cooling solutions, and which method to choose for different types of cargo.
Passive Cooling
What Is It?
Passive cooling uses insulation materials (such as polystyrene or vacuum panels) combined with cooling elements (dry ice, gel packs, water ice) to maintain the required temperature without active power supply.
Advantages
- Lower costs compared to active cooling
- No power source or monitoring needed during flight
- Suitable for shorter flights (up to 48-72 hours)
- Easier preparation process
- Wider airline acceptance
Limitations
- Limited protection duration
- Temperature can fluctuate based on external conditions
- Requires careful packaging and calculation
- May be insufficient for highly sensitive cargo
- Dry ice is dangerous goods (UN1845) with restrictions
Active Cooling
What Is It?
Active cooling uses special containers (such as reefer containers or RKN containers) with built-in cooling units that actively maintain precise temperature throughout the shipment. These containers are equipped with power supplies and temperature monitoring systems.
Advantages
- Precise temperature control throughout journey
- Suitable for long routes and connections
- Real-time temperature monitoring
- Better protection for sensitive pharmaceutical and biological cargo
- Lower risk of temperature fluctuations
Limitations
- Significantly higher costs
- Special equipment availability required
- Not all airlines and airports offer this service
- Longer preparation time
- Power supply needed at all transfer points
Special Considerations for Narrow-Body Aircraft
In narrow-body aircraft (such as Airbus A220, Boeing 737), cargo holds are not heated and temperatures can drop to -40°C at cruise altitude. This means passive cooling solutions with dry ice can be more effective, but additional insulation is needed to prevent excessive freezing for sensitive cargo.
Wide-body aircraft (Boeing 777, Airbus A350) typically have heated cargo holds maintained at approximately +10°C to +15°C, providing better conditions for temperature control.
Comparison Table
| Criteria | Passive Cooling | Active Cooling |
|---|---|---|
| Cost | Lower | Higher |
| Duration | 24-72 hours | Unlimited |
| Precision | Medium (±5-10°C) | High (±2°C) |
| Availability | Wide | Limited |
| Suitable for | Food, wines, flowers | Pharmaceuticals, biologicals, vaccines |
Best Practices
- Plan ahead - temperature-controlled shipping preparation takes more time
- Consult with experts on choosing the right solution for your cargo
- Include temperature data loggers to document temperature throughout the journey
- Choose direct flights when possible to minimize transfer risks
- Ensure all documentation is in order before shipping
- Insure your cargo - temperature-sensitive cargo carries higher risk