Logistics Sub-Sector Land Transportation

 
Cargo Handling 
Pre-cooling of Cargo 
 
•
The reefer containers are devised to maintain the temperature of the products they contain, 
not to lower it. 
•
Goods are required to be pre-cooled to the necessary carriage temperature before being 
packed into the container. This helps in maintaining the quality and freshness of the 
perishable products to prevent spoilage. 
•
Goods stuffed at temperatures above carriage temperature can cause considerable strain on 
the reefer unit and may eventually result in a breakdown. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 5.2.3. Pre-Cooling of cargo 
 
Process of Preparation 
•
Goods must be adequately pre-cooled to its desired temperature before packing unless 
loading in a cold tunnel concept. 
•
Ensure that the reefer container is at the correct temperature setting.
•
Air vents have to be opened to the necessary setting to release ethylene gas and carbon 
dioxide based on its required respiration rate. This is applicable for chilled cargos that are 
perishable and have limited shelf life. 
•
Ensure to switch off the reefer machinery during cargo stuffing to prevent condensation. 

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Participant Handbook 
86 
 Fig. 5.2.4. Process Preparation 
 
Note: 
•
It is vital to note that reefer containers are devised to maintain the temperature of the goods 
and not pre-cooling it. Pre-cooling is a distinct operation performed before transportation or 
storage that involves special equipment or cooling facilities. 
•
Pre-cooling of the reefer container should not happen unless temperatures in the cold store 
and the container are identical and a "Cold Tunnel" is used. 
•
A cold tunnel is a tight duct between the cold store and the container, which prevents ambient 
air from entering. If the container is pre-cooled in an open environment, ambient hot air will 
meet internal cold air once the doors are opened, resulting in condensation on the interior 
surfaces. Condensed water can drip from the roof of the container and cause stains and frost 
on the boxes. 
•
If loading in a cold tunnel concept, the machinery may operate during loading.