In an adsorber for an adsorption type refrigerator of the present invention, aluminum heat exchangers 120, 130 arranged in a casing 110 are provided with films which do not permit moisture to pass therethrough, such as SiO3 films, anodic oxide coating films and several ppm to a hundred and several tens of ppm of inorganic negative ions such as PO43-, SiO32- are added in the water enclosed in the casing.

 
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