| 摘要 |
The present invention relates to a thermal storage unit comprising: an enclosure (41) comprising orifices (42; 44) allowing a heat-transfer fluid to be let into and out of said enclosure, and a stack of bricks preferably made of a material that has a heat capacity at 25°C of more than 600 J.°C‑1.kg‑1, said bricks being arranged in said enclosure in the form of superposed layers (46; 46'), each layer having lower (47a; 47a') and upper (47b; 47b') large faces and defining a plurality of ducts (48; 48') each opening via lower (49a; 49a') and upper (49b; 49b') openings onto said lower and upper large faces respectively, the stack comprising a pair of layers made up of a lower layer (46) and of an upper layer (46') superposed on said lower layer and referred as a "passage layer pair", the upper (47b) and lower (47a') large faces of said lower layer and of said upper layer, respectively, being separated from one another so as to define a preferably substantially horizontal passage (52) placing an upper opening (49b) of a lower duct (48) of said lower layer in fluidic communication with at least one lower opening, entirely offset with respect to said upper opening (49b), of at least one upper duct of said upper layer, the lower large face (47a') of the upper layer at least partially closing off said upper opening (49b), referred to as a "closed-off upper opening" when said upper opening (49b) is observed, along the axis thereof, from said lower duct (48), said bricks being configured and arranged in such a way that said stack has a void volume fraction less than or equal to 60%, in which storage unit over 20% by number of the upper openings of said lower layer are closed-off upper openings, over 20% by number of the pairs of superposed layers of the stack each being referred to as a passage layer pair. |
