The patent technology of “triple heat-exchanging system” invented in 1979 by Japanese Kyowa, is developed from a very simple idea that is to adopt the refrigerant chiller’s external surface to be the ice condenser.
The heat exchanger is installed inside the condenser，that is the condensing board equipped with the refrigerant cooling pipe, the referent flowing inside the cooling pipe, which coagulate the vapor surrounding the condensing board. Refrigerant /heat carrier, refrigerant/vapor, heat carrier/ vapor, these three medias exchange their energy effectively, so it is called “tripe heat exchanging system”.
During the pre-cooling , the heat exchanger works for cooling the shelves , at the end of pre-cooling ,it is temperature has been lower than shelves, so it is no need to switch the compressors to cool the condenser, that is to say the evacuation can be operated directly. But during the sublimation, the shelves system and condenser system are separated, and the shelves system would be heated.
Since the compressor is only for cooling the heat carrier, during the time of low-charging, some refrigerant would flow to the condenser to keep it’s temperature within a certain range. As an age for process validation, the system with temperature-controllable condenser which can enable the uniformity and reproduction is significant .
The condensing board, which adopts the material of SuS316L, is banned longitudinally. Since the upper part has more ice, for facilitating the vapor to flow to the gap between the shelves, the upper gap between the shelves are bigger. This structure is easy for cleaning compared with cooling pipe.