A vacuum precooling machine is a type of refrigeration equipment that uses a vacuum to rapidly cool produce, such as fruits, vegetables, and flowers, immediately after they are harvested. This process helps to extend the shelf life of the produce, improve its quality, and reduce post-harvest losses.

The vacuum precooling process works by removing air and moisture from the produce through the application of a vacuum, which reduces the pressure inside the chamber. As the pressure drops, the boiling point of water in the produce also drops, causing the water to evaporate and cool the produce. The cooled produce is then removed from the vacuum chamber and packaged for transportation or storage.

Vacuum precooling machines are commonly used in the agricultural industry, especially for the transportation of fresh produce over long distances. The process can be used on a variety of produce, including berries, lettuce, broccoli, and cut flowers. The use of vacuum precooling machines can help reduce transportation costs, increase the quality of the produce, and reduce food waste.