One of the major problems of the construction of adsorption chillers is the need to design a vacuum vessel containing the adsorber heat exchangers, the evaporator and the condenser. Typical design rules for vacuum vessels result in very heavy and voluminous constructions due to the demands of stability against atmospheric pressure. In order to overcome this disadvantage we developed a design, where the heat exchangers and the internal construction of the machine are used as a support for the vacuum-tight envelope. This dual-use allows to applying thin stainless steel metal sheet as vacuum containment (See fig.3). This light and very simple construction results in very high savings of material and volume and is a major step for the construction of an economical adsorption chiller.