Working Principle of Tunnel Freezer Evaporators

Working Principle of Tunnel Freezer Evaporators

The working principle of the tunnel freezer evaporator is based on the principles of heat exchange and phase change.

Firstly, the refrigerant enters the evaporator in the form of a low-temperature, low-pressure liquid. Inside the evaporator, the refrigerant comes into close contact with the medium to be cooled (usually air or an object) through structures such as pipes or coils.

Since the temperature of the refrigerant is lower than that of the medium to be cooled, heat is transferred from the medium to be cooled to the refrigerant. As the heat is transferred, the refrigerant absorbs the heat and gradually evaporates and gasifies.

In this process, the refrigerant is transformed from a liquid to a gas and a phase change is realised. The phase change process absorbs a large amount of heat, which significantly reduces the temperature of the medium being cooled.

In order to enhance the heat exchange effect, evaporators are usually designed with special features such as increased heat transfer area and optimised fluid flow. For example, tubes with fins may be used to increase the contact area with the air; or a complex coil structure may be used so that the refrigerant can fully come into contact with the object being cooled.

In food freezing applications, as the food passes through the tunnel, the refrigerant in the surrounding evaporator continuously absorbs heat from the food, causing it to cool and freeze rapidly.

In industrial cooling scenarios, the liquid to be cooled transfers heat to the refrigerant as it flows through the evaporator, thereby lowering the temperature of the liquid.

The evaporator of the tunnel freezer effectively achieves the cooling of the medium through the phase change and heat exchange of the refrigerant.