Abstract A plate type evaporator comprising a plurality of vertically extending plate elements assembled face-to-face to define therebetween alternate channels for a heating medium and for a liquid to be evaporated. In order to accelerate the nuclear boiling of the liquid in the liquid channels, the heat transfer surface of each plate element has a plurality of vertically extending transversely spaced ridges projecting toward the associated liquid channel, such ridges being in contact with the heat transfer surface of the opposed plate element to provide areas of contact assisting in the evolution of vapor bubbles and divide the liquid channel into narrow sections assisting in the generation of vapor, such sections also assuring that even in deeper places in the liquid channel, vapor bubbles will be generated without yielding to the liquid pressure; alternatively, each plate element has a porous layer formed on its heat transfer surface facing the liquid channel. These heat transfer constructions permit attainment of even higher boiling heat transfer if the liquid in the liquid channels is caused to circulate.
A plate type evaporator comprising a plurality of vertically extending plate elements assembled face-to-face to define therebetween alternate channels for a heating medium and for a liquid to be evaporated, a liquid circulation passageway establishing communication between the top and bottom of said liquid channels, a vapor taking-out port provided in the top of said circulation passageway, and a liquid supplying nozzle provided in said circulation passageway for supplying liquid to compensate for the amount evaporated, said circulation passageway allowing the natural circulation of the liquid which is brought about by the pumping effect due to the evaporation of liquid, the injection of the supply liquid from said nozzle accelerating said circulation, whereby flow is imparted to the liquid along the heat transfer surfaces of the plate elements, each plate element being formed with a porous layer on its heat transfer surface facing the associated liquid channel.
Claim 2
Dependent Claim
147 words
A plate type evaporator comprising a plurality of vertically extending plate elements assembled face-to-face to define therebetween alternate channels for a heating medium and for a liquid to be evaporated, a liquid circulation passageway establishing communication between the top and bottom of said liquid channels, a vapor taking-out port provided in the top of said circulation passageway, and a liquid supplying nozzle provided in said circulation passageway for supplying liquid to compensate for the amount evaporated, said circulation passageway allowing the natural circulation of the liquid which is brought about by the pumping effect due to the evaporation of liquid, the injection of the supply liquid from said nozzle accelerating said circulation, whereby flow is imparted to the liquid along the heat transfer surfaces of the plate elements, each plate element being formed with a porous layer on its heat transfer surface facing the associated liquid channel.