FIELD: solar electric motor installations. SUBSTANCE: given heat accumulator provides for accumulation of heat from concentrator of solar energy. It is proposed that axially symmetric heat accumulating block with longitudinal conduits and protective element for flow of working medium connected to butt collectors has ducts manufactured in the form of radial grooves to enhance resistance of accumulator under operational temperatures and at same time to reduce its cost as well as to simplify technology of its manufacture. EFFECT: improved operational characteristics of heat accumulator. _
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