What is the purpose of the air space in vat pasteurization?

The air space in vat pasteurization serves as an important factor for ensuring proper temperature readings during the pasteurization process. This space allows for adequate circulation of the heated air, which helps maintain uniform temperature throughout the contents of the vat. Without this air space, temperature differentials could occur, leading to areas of the liquid not reaching the necessary pasteurization temperature, which is crucial for effectively killing harmful microorganisms.

In addition to ensuring accurate temperature measurement, the air space can also mitigate issues like thermal stratification, where different parts of the liquid could be at varying temperatures. This uniformity is essential for achieving effective pasteurization, ensuring that all portions of the liquid have been adequately heated to the desired temperature for the required amount of time.