Precooling, the rapid removal of heat from freshly harvested vegetables, allows the grower to harvest produce at optimum maturity with greater assurance that it will reach the consumer at maximum quality. Precooling benefits the vegetable by slowing the natural deterioration that starts shortly after harvest, slowing the growth of decay organisms and reducing wilt by retarding water loss.

Precooling can be divided into hydrocooling, contact icing, vacuum cooling, and air cooling. The preferred method of precooling varies according to the characteristics of the cargoes. In hydrocooling the vegetable is cooled by direct contact with cold water flowing through the packed containers and absorbing heat directly from the produce. In contact icing crushed ice is placed in the package or spread over a stack of packages to precool the contents. The vacuum cooling process produces rapid evaporation of a small quantity of water, lowering the temperature of the crop to the desired level. Air cooling involves the exposure of vegetables to cold air; the air must be as cold as possible for rapid cooling but not low enough to freeze the produce exposed to the direct air blast. (via. Britannica)

As is shown in the excerpt above, precooling is a very important step in cold chain transportation. Both cargoes and boxes need to be precooled before uploading. The purpose of cargoes precooling is to reduce field heat and retain the freshness of temperature-sensitive cargoes; And for boxes, precooling can help make a suitable temperature for perishable goods in advance and improve the efficiency of delivery. If you start delivery without doing precooling, the energy consumption of your truck reefer unit could be increased and thus cost you more and cut your profit. In a worse situation, irreversible harm could be done to your temperature-sensitive goods. These perishable cargoes are too fragile for cooling on the spot. So, make comprehensive prepare when you are about to deliver certain kinds of cargoes.

Kingclima truck reefer unit can cool your boxes faster. Having a built-in standby system, Kingclima truck refrigeration unit can work independently while parked, or during uploading and unloading., which can help you make a successful delivery with higher efficiency and lower cost. Kingclima got your cargoes and business in a safer way.

Being a leading manufacturer in truck reefer unit industry, Kingclima is famous for its high-quality reefer units, stable performance, and professional service. Guaranteed by CE certification, Kingclima reefer units are safer and more reliable. If you want to learn more details about precooling and truck reefer units, please leave your message below or send us an e-mail, it is a pleasure for Kingclima to provide professional guidance and training for our users and partners.