Device for heat transfer between two walls

Device for heat transfer between a first wall and a second wall respectively in contact with a first thermal mass and a second thermal mass, comprising:

• an insulating unit capable of being interposed between the first wall and the second wall to define a closed loop for the circulation of a heat-exchanging fluid, and including a first channel extending substantially vertically along the first wall and a second channel extending substantially vertically along the second wall, the first channel and the second channel being staggered with respect to one another in the vertical direction in order to define a low channel and a high channel, as well as an upper channel connecting the first channel and the second channel and a lower channel connecting the first channel and the second channel,
• wherein the circulation of the heat-exchanging fluid is effected naturally in the loop when the low channel is at a higher temperature than the high channel, which permits a heat transfer, and the circulation of heat-exchanging fluid is naturally blocked in the loop when the low channel is at a lower temperature than the high channel, which prevents heat transfer by forming a thermal insulator, and
• wherein the insulating unit includes an insulating core placed between the first wall and the second wall to define respectively the first channel and the second channel, as well as an upper partition and a lower partition disposed respectively above and below the core to define respectively the upper channel and the lower channel.