Double wall water tank with vacuum reloading for storing heat, has inner tank, which is filled with water and intermediate space in double wall, where vacuum is permanently reloaded in intermediate space

摘要

The double wall water tank has an inner tank, which is filled with water and an intermediate space in the double wall, where the vacuum is permanently reloaded in the intermediate space. The double wall is completely isolated or only the inner tank on the outer side is isolated against the radiant heat.