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A dehumidification unit comprised of alternate laminations of an adsorption element which supports an adsorbent and which is provided with a first air ventilation passage and a cooling element, which is provided with a second air ventilation passage. The first air ventilation passage of the adsorpti

A dehumidification unit comprised of alternate laminations of an adsorption element which supports an adsorbent and which is provided with a first air ventilation passage and a cooling element, which is provided with a second air ventilation passage. The first air ventilation passage of the adsorption element and the second air ventilation passage of the cooling element are adjacently formed, with a single plate member lying between the first and second air ventilation passages. As a result of such arrangement, as compared with a structure formed with two plate members lying therebetween second air ventilation passages, the performance of heat transfer between the air ventilation passages is further improved, whereby the dehumidification capability of the dehumidification unit is maintained at high levels over a long period of time.

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What is claimed is: 1. A dehumidification unit comprising alternate laminations of an adsorption element which supports an adsorbent and which is provided with a first air ventilation passage through which air to be processed is passed, and a cooling element which is provided with a second air vent

What is claimed is: 1. A dehumidification unit comprising alternate laminations of an adsorption element which supports an adsorbent and which is provided with a first air ventilation passage through which air to be processed is passed, and a cooling element which is provided with a second air ventilation passage through which cooling air is passed, where said first air ventilation passage of said adsorption element and said second air ventilation passage of said cooling element are adjacently formed, with a single plate member lying between said first air ventilation passage and said second air ventilation passage; and wherein said single-plate member is formed of an air and moisture permeable material and an exterior surface of said side-plate member is provided with waterproofing means. 2. A dehumidification unit comprising alternate laminations of an adsorption element which supports an adsorbent and which is provided with a first air ventilation passage through which air to be processed is passed, and a cooling element which is provided with a second air ventilation passage through which cooling air is passed. where said first air ventilation passage of said adsorption element and said second air ventilation passage of said cooling element are adjacently formed, with a single plate member lying between said first air ventilation passage and said second air ventilation passage; and wherein said plate member is a side-plate member which is made of fiber paper and which constitutes a side wall of said adsorption element relative to the lamination direction thereof, said side-plate member directly faces said second air ventilation passage of said cooling element and, in addition, a separation sheet layer configured to prevent the passage of gas and liquid is formed on a surface of said side-plate member on the side of said second air ventilation passage. 3. The dehumidification unit of claim 2, wherein: said plate member is a side-plate member which is formed by a metallic or resinous member and which constitutes a side wall of said cooling element relative to the lamination direction thereof, and said side-plate member directly faces said first air ventilation passage of said adsorption element. 4. A dehumidification unit comprising alternate laminations of an adsorption element which supports an adsorbent and which is provided with a first air ventilation passage through which air to be processed is passed, and a cooling element which is provided with a second air ventilation passage through which cooling air is passed, where said first air ventilation passage of said adsorption element and said second air ventilation passage of said cooling element are adjacently formed, said adsorption element in which a large number of air ventilation passages are formed on the inside of a single pair of tabular side-plate members spacedely opposed to each other and an absorbent is supported on the side of an interior surface of each of said air ventilation passages; and wherein said side-plate members are each formed of an air and moisture permeable material and either or both of exterior surfaces of said side-plate members are provided with waterproofing means. 5. The dehumidification unit of any of claims 1, 2, or 4, wherein: an air ventilation passage forming member of said cooling element is formed by a bending plate member shaped like a corrugated plate. 6. The dehumidification unit of any of claims 1, 2, or 4, wherein: an air ventilation passage forming member of said cooling element is formed by a bending plate member shaped like a trapezoidally corrugated plate. 7. The dehumidification unit of any of claims 1, 2, or 4, wherein; an air ventilation passage forming member of said cooling element is made up of a plurality of partition walls vertically arranged in the thickness direction of said cooling element. 8. The dehumidification unit of claim 2, wherein: said separation sheet layer is formed by attachment of a plastic film, by vapor deposition of a metallic material, or by application of an organic binder. 9. An adsorption element in which a large number of air ventilation passages are formed on the inside of a single pair of tabular side-plate members spacedely opposed to each other and an absorbent is supported on the side of an interior surface of each of said air ventilation passages wherein: said side-plate members are each formed of an air and moisture permeable material, and either or both of exterior surfaces of said side-plate members are provided with waterproofing means. 10. An adsorption element in which a large number of air ventilation passages are formed at an interior surface of a tabular side-plate member and an absorbent is supported on the side of an interior surface of each of said air ventilation passages wherein: said side-plate member is formed of an air and moisture permeable material, and an exterior surface of said side-plate member is provided with waterproofing means. 11. The adsorption element of claim 9 or claim 10, wherein: as said permeable material of which said side-plate member is formed, ceramic fiber paper, glass fiber paper, flame resistant paper, or nonwoven fabric is used. 12. The adsorption element of claim 9 or claim 10, wherein: said waterproofing means is formed by attachment of a plastic film to said exterior surface of said side-plate member, by application of an organic binder to said exterior surface, or by vapor deposition of a metallic material on said exterior surface. 13. The adsorption element of claim 9 or claim 10, wherein: said waterproofing means is partially provided only in a corresponding area of said exterior surface of said side-plate member to a non waterproofing structure portion of said cooling element which faces said exterior surface.