Flat heat pipe with reservoir function

A flat heat pipe with a two-phase liquid-vapor working fluid, comprising:

• a first plate configured to receive thermal energy from a heat source,
• a second plate configured to transfer thermal energy to a cold source, arranged opposite and substantially parallel to the first plate,
• an edge sealingly connecting the first and second plates, forming a closed internal space enclosing the two-phase liquid-vapor working fluid,
• a capillary structure interposed between the first and second plates,
• vaporization channels adjacent to the first plate,
• condensation channels adjacent to the second plate,
• at least one transfer passage placing the vaporization channels in communication with the condensation channels for transporting vapor, and
• at least one collection channel forming a reservoir, in fluid communication with each condensation channel, said collection channel being adjacent to the second plate;
• such that the collection channel is arranged to attract and store excess liquid phase, wherein the two-phase liquid-vapor working fluid is selected so that the reservoir is completely filled with vapor phase at a minimum operating temperature of the heat pipe.

A flat heat pipe with a two-phase liquid-vapor working fluid, comprising:

• a first plate configured to receive thermal energy from a heat source,
• a second plate configured to transfer thermal energy to a cold source, arranged opposite and substantially parallel to the first plate,
• an edge sealingly connecting the first and second plates, forming a closed internal space enclosing the two-phase liquid-vapor working fluid,
• a capillary structure interposed between the first and second plates,
• vaporization channels adjacent to the first plate,
• condensation channels adjacent to the second plate,
• at least one transfer passage placing the vaporization channels in communication with the condensation channels for transporting vapor, and
• at least one collection channel forming a reservoir, in fluid communication with each condensation channel, said collection channel being adjacent to the second plate;
• such that the collection channel is arranged to attract and store excess liquid phase, wherein the collection channel is only in fluid communication with the condensation channels, and the collection channel is deprived of any other fluid communication with the vaporization channels.