What Temperature Can a Trailer Refrigeration Unit Reach?
When choosing a trailer refrigeration unit, one of the first questions refrigerated transport operators ask is: What temperature can a trailer refrigeration unit reach?
The answer depends on the refrigeration unit, trailer size, insulation performance, ambient temperature, cargo condition, and required set point. A modern semi trailer refrigeration unit can typically be configured for chilled and frozen transportation, with some high-performance systems capable of maintaining temperatures down to around -25°C to -30°C under suitable operating conditions.
However, reaching a low temperature is not the only consideration. The refrigeration unit must also be capable of maintaining a stable temperature throughout the trailer during long-distance transportation.
Typical Temperature Ranges for Trailer Refrigeration
Different types of cargo require different temperature ranges. A suitable reefer trailer refrigeration unit should be selected according to the actual cargo requirements rather than simply choosing the unit with the lowest advertised temperature.
| Cargo Type |
Typical Temperature Range |
| Fresh vegetables and fruits |
+2°C to +8°C |
| Dairy products |
+2°C to +6°C |
| Fresh meat |
0°C to +4°C |
| Seafood |
-2°C to +2°C |
| Chilled food |
0°C to +5°C |
| Frozen meat |
-18°C to -25°C |
| Frozen food |
-18°C to -25°C |
| Ice cream |
Around -20°C to -30°C |
These ranges are general transportation references. The required set point should always follow the specific cargo, packaging, transportation regulations, and customer's cold-chain requirements.
Why Airflow Matters for Temperature Uniformity
Achieving a low temperature at the front of the trailer does not necessarily mean the entire cargo area is at the same temperature.
The refrigeration unit needs to circulate cold air effectively throughout the trailer.
Poor airflow can create:
- Warm spots
- Uneven cargo temperatures
- Localized freezing
- Longer cooling times
- Increased compressor operation
The evaporator, air distribution system, cargo arrangement, and return-air path all influence temperature uniformity.
Therefore, when selecting a semi trailer refrigeration unit, buyers should consider both cooling capacity and airflow performance.
KingClima Trailer Refrigeration Units for Chilled and Frozen Transport
KingClima provides refrigeration solutions for different refrigerated transportation requirements, including semi trailer refrigeration units, trailer refrigeration units, truck refrigeration units, and mobile refrigerated applications.
For applications requiring both chilled and frozen transportation, the refrigeration system can be selected according to the trailer dimensions, target temperature, cargo type, and operating environment.
For demanding applications, KingClima trailer refrigeration units can be configured for low-temperature operation, with selected systems capable of reaching temperatures around -25°C to -30°C under appropriate conditions.
KingClima can also provide electric standby solutions for customers who need refrigeration while the trailer is parked and connected to external power.
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