STUDY ON THE STRUCTURAL AND CHARACTERISTICAL DIFFERENCES OF THE CATCHER IN BOTH VACUUM PRE-COOLING AND VACUUM FREEZING

Vacuum pre-cooling and vacuum freezing are modern technologies of food processing,both of whose realization rely on the attainment of vacuum.The two different systems need the same device-the vapor condenser.But the device works differently in the two systems.It is significant to know of all the differences in order that we can do food administrations properly and correctly using modern food processing technologies.The principles of operation,operating conditions,aims of operation,structural characteristics and the phase change of vapor as well as problems now still existing of the vapor condenser in vacuum pre-cooling and in vacuum freezing were stressed.