Patent ID: 8909034

Claim:
A radiator for domestic heating with a heat-transfer fluid operating in two-phase form, said heat-transfer fluid comprising a mixture of at least two different heat-transfer liquids, said radiator comprising: a reservoir of said heat-transfer fluid; a heating element intended to raise the temperature of said heat-transfer fluid to a temperature such that it causes said fluid to undergo a change of phase from liquid to vapor; a heater for transferring heat from said heat-transfer vapor to ambient air having at least one channel, at which the heat transfer with the ambient air takes place, communicating in a lower zone with the reservoir, each of the at least one channels being closed at an upper end thereof such that all the heat-transfer vapor that flows upward in each channel undergoes condensation in said channel by transferring heat to ambient air through a wall of said channel, and the heat-transfer liquid resulting from condensation on the wall of said channel also flows downward in the same channel, and wherein said heat-transfer liquids have between them boiling points differing by at least ten degrees Celsius, and wherein the liquid with the lowest boiling point represents 70% to 95% of the volume of the mixture for a mixture temperature of about 20° C.