PURPOSE: To obtain a high efficiency heat exchanger which uses a hydrophobic porous film.
CONSTITUTION: A large number of heat exchanger tubes made of a hydrophobic porous material 2, which allows the penetration of steam into the material but allows no penetration of liquid, are bundled. A low temperature fluid 1, which is liquid, is passed inside the heat exchanger tubes while a high temperature fluid 2, which is liquid or steam, is passed outside the heat exchanger tubes. It is acceptable even if this internal and external relation is opposite. When the high temperature fluid 2 is liquid, the liquid is vaporized and turned into steam, which penetrates the porous material and enters the low temperature fluid side where it is condensed and turned into liquid. The liquid itself which is a high temperature fluid is unable to penetrate the porous material. When the high temperature fluid is steam, the steam is partially condensed on the high temperature fluid side and turned into liquid drops. The liquid drops thus produced are unable to penetrate the porous material as well. In this manner, heat is transferred from the high temperature fluid 2 to the lower temperature fluid 1. The heat transfer based on thermal conduction of the porous body 2 is added to this heat transfer mechanism as well. It is, therefore, possible to inhibit the penetration with the porous material and prevent the mixture into the low temperature fluid even when there exist impurities in the fluid.
KUROKAWA HIDEAKI
YAMAGUCHI TETSUO
NISHINO YOSHITAKA
BABA TSUTOMU
SAWA TOSHIO
