F - Mech Eng,Light,Heat,Weapons – 28 – D
Patent
F - Mech Eng,Light,Heat,Weapons
28
D
148/13, 165/23
F28D 17/02 (2006.01) F24F 13/30 (2006.01) F28D 19/04 (2006.01)
Patent
CA 1085714
HUMIDITY AND HEAT EXCHANGER APPARATUS, AND METHOD FOR ITS MANUFACTURE Abstract The transfer elements of the rotor of a regenerative heat and humidity exchanger are made of a non-hygroscopic material, such as aluminum, the surface of which is treated to form a hygroscopic layer thereon. This provides the benefits in humidity transfer previously obtained with all-hygroscopic transfer elements such as paper, cardboard or asbestos, with- out the danger of fire in the use of paper or cardboard or the danger to health in the use of asbestos. The transfer element is of metal on which a hygroscopic surface layer is formed by oxidizing the surface by pickling and/or heat treatment, and preferably the oxide layer is impregnated with a substance, e.g. lithium chloride, to render it more hygroscopic. Preferably also, the layer is made more porous by acid treatment prior to oxide formation, and acid treatment may be used after the pickling process to arrest the pickling reaction promptly.
244379
Strindehag Ove
Wrangel Erik
Ab Svenska Flaktfabriken
Gowling Lafleur Henderson Llp
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