Introduction 
A tunnel freezer is a type of industrial freezer used for rapid freezing of food products. It is particularly suitable for products that require individual quick freezing (IQF), such as vegetables, fruits, seafood, and meat. The tunnel freezer uses a conveyor belt to move products through a freezing chamber, where they are exposed to very low temperatures.

Parameters
Capacity: Tunnel freezers can process anywhere from a few hundred kilograms to several tons per hour, depending on the size and design.
Temperature Range: The freezing temperature typically ranges from -30°C to -40°C (-22°F to -40°F), ensuring rapid freezing.
Freezing Time: The residence time in the tunnel can be adjusted, but it generally ranges from 5 to 20 minutes, depending on the product and desired freezing rate.
Cooling Medium: Most tunnel freezers use liquid nitrogen or carbon dioxide as the cooling medium, although some may use mechanical refrigeration.
Conveyor System: The conveyor belt is usually made from stainless steel or food-grade plastic, and its speed can be adjusted to control the freezing time.
Automation: Modern tunnel freezers are equipped with automated controls for temperature, conveyor speed, and defrost cycles, ensuring consistent freezing and reducing labor costs.