Since the release of the eight countries, the product structure of tea is also gradually adjusted, high-end tea market precooling, the overall industry profit margins have fallen since 2013.
Since the precooling air temperature of nitrogen unit is too high, the measure and process design scheme for using the refrigerant water to reduce the pre-cooling air temperature are recommended.
The vent hole size and the pressure drop are the important parameters which affect cooling rate and cooling uniformity in pressure pre-cooling of fruit and vegetable.