Abstract: The invention relates to a modular assembly (E) for storing heat by phase-change material including a plurality of heat-storage modules (M1) attached to one another, the heat-storage assembly comprising a vessel (2). At least two adjacent modules are disposed so that a porous external wall (6b) of one of the modules (M1) is arranged facing a porous external wall (6b) of the other of the modules (M1), and so that a solid external wall (6a) of one of the modules (M1), forming one of the parts of the vessel, is attached to a solid external wall (6a) of the other of the modules (M1), forming another part of the vessel.

Abstract: The invention relates to a modular assembly (E) for storing heat by phase-change material including a plurality of heat-storage modules (M1) attached to one another, the heat-storage assembly comprising a vessel (2). At least two adjacent modules are disposed so that a porous external wall (6b) of one of the modules (M1) is arranged facing a porous external wall (6b) of the other of the modules (M1), and so that a solid external wall (6a) of one of the modules (M1), forming one of the parts of the vessel, is attached to a solid external wall (6a) of the other of the modules (M1), forming another part of the vessel.

Abstract: A method for transfer of heat between a first and a second fluid, wherein the first and the second fluid circulate respectively on both sides of a thermally conductive wall of a monobloc assembly formed in a single piece. The monobloc assembly, which is arranged in the interior of a device, includes: a first, three-dimensional, cellular, thermally conductive structure through which the first fluid can pass; at least the thermally conductive wall; and a second, three-dimensional, cellular, thermally conductive structure through which the second fluid can pass. The first and second three-dimensional, cellular structures are situated on both sides of and integral with the wall such that heat transfer is carried out from the first to the second fluid through the wall, and both first and second fluids are under liquid phases and under gaseous phases, with the liquid phases circulating in a direction opposite that of the gaseous phases.