Title: 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, without the danger of fire in the use of paper or cardboard or the danger to health in the use of asbestos. Preferably 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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Strindehag, Ove (Jonkoping, SW)
Wrangel, Erik (Jonkoping, SW)

Application Number: 651589
Filing Date: 1976-01-22
Publication_date: 1977-07-26
Assignee: Aktiebolaget Svenska Flaktfabriken (Nacka, SW)
Primary Class(es): 96/118 96/153
Other Classes:
US Patent Ref:

2792071	May, 1957	Pennington	55/34.
3176446	Apr, 1965	Siggelin	55/34.
3572008	Mar, 1971	Hankison et al.	55/33.
3708956	Jan, 1973	Norback	55/34.
3733791	May, 1973	Dravnieks	55/390.

Other Refs:
Primary Examiner: Spear, Jr., Frank A.
Assistant Examiner: Spitzer, Robert H.
Attorney: Howson and Howson