FIELD: two-layer thermal energy accumulators, for example solar energy accumulators. SUBSTANCE: heat is absorbed by heat accumulating layer 24 and then it is transferred to consumer by transfer layer 24 through tube 30. Each layer (22, 24) is formed by agent which may withstand phase transition within working temperature range. Density of layer 24 in solid state is lesser than that in liquid state; heat transfer layer 22 is formed by molten metal whose density is higher than both phases of accumulating layer 22. EFFECT: enhanced thermal efficiency of system. 10 cl, 19 dwg
