An ammonia water absorption chiller unit for drive temperatures of also less than 100° C. with at least one absorber arranged in a refrigerant cycle, wherein the absorber includes a fully welded packet of plates for an inner medium which is in turn placed in a casing for an outer medium. A method of minimum complexity for leading media in at least one refrigerant cycle of the ammonia water absorption chiller unit using heat exchangers which include a fully welded packet of plates for an inner medium which is in turn arranged in a casing for an outer medium. A use of an absorber which includes a fully welded packet of plates for an inner medium which is in turn arranged in a casing for an outer medium in a refrigerant cycle of the ammonia water absorption chiller unit.
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