Thermal apparatus

A thermal apparatus comprising an apparatus core in which thermal energy is produced, the thermal apparatus comprising at least one primary circuit in which a heat transfer primary fluid is capable of circulating,

• the primary fluid being moved in the primary circuit in a reciprocating movement by a displacement device, and at least one heat exchange interface wherein the primary fluid interfaces with a secondary fluid that circulates unidirectionally in a secondary circuit,
• wherein the primary circuit is divided into at least two unidirectional primary circuit portions and comprises division points located at an outlet of the core of the thermal apparatus, so that, at every flow direction change of the primary fluid, the primary fluid flows through one portion of the unidirectional primary circuit portions,
• each of the at least two portions of the unidirectional primary circuit is delimited by two division points, and
• the at least one heat exchange interface arranged between these two division points comprises at least one heat exchange zone in which the primary fluid and the secondary fluid flow unidirectionally and countercurrent with respect to one another, the at least one heat exchange zone comprises at least one common unidirectional primary circuit portion in which the at least two portions of the unidirectional primary circuit come together, and the at least two portions of the unidirectional primary circuit come together, and the at least two portions of the unidirectional primary circuit is provided with a device for controlling a flow direction of the primary fluid capable of forcing an unidirectional flow direction of the primary fluid and is arranged so that the primary fluid flows in the at least one common unidirectional primary circuit portion continuously and unidirectionally at each iteration.