Cartridge for a heat engine having a thermodynamic cycle and associated heat engine

Cartridge for moving a thermodynamic fluid between a cold part connected to a first heat source and a hot part connected to a second heat source for a thermodynamic cycle heat engine, comprising at least:

• a first exchanger, forming a “cold” part, comprising a first hollow section comprising first means for circulating at least one heat-transfer fluid suitable and intended for connection to a first heat-transfer fluid supply circuit connected to a first heat source, said first section comprising an inner wall and an outer wall,
• a second heat exchanger, forming a hot section, comprising a second hollow section including second means for circulating at least one heat-transfer fluid, adapted and designed to be connected to a second heat-transfer fluid supply circuit connected to a second heat source, said second section comprising an inner wall and an outer wall,
• a third hollow section adapted and intended to be connected to at least one supply circuit for at least one working fluid, said third section being disposed inside the first section and the second section, said third section comprising an inner wall and an outer wall, at least part of the inner wall of the first section and a first part of the outer wall of the third section being spaced apart and facing each other so as to form a first filling space, at least part of the inner wall of the second section and a second part of the outer wall of the third section being spaced apart and facing each other to form a second filling space,
• at least one chamber suitable and designed to contain at least one thermodynamic fluid at high pressure and in the supercritical state, said chamber comprising at least the first filling space and the second filling space which are communicating,
• at least one displacer arranged inside said chamber and slidably mounted relative to the outer wall of said third profile and movable between a first position and a second position, and configured to alternately displace said at least one thermodynamic fluid between the first filling space and the second filling space,
• a piston disposed inside said third profile and slidably mounted relative to the inner wall of said third profile and movable between the first position and the second position, the piston being adapted and designed to be displaced by said at least one working fluid between the first position and the second position, the displacer and the piston being coupled to one another.