Thermosyphon heat recovery

Claim 1

A thermosyphonic heat recovery unit for thermosyphonic heat transfer of heat from a hotter first fluid to a cooler second fluid, comprising in combination: a heat exchanger including a first fluid conduit and a second fluid conduit connected in a heat exchanging relationship with one another; means for connecting a pressurized source of the hotter first fluid in fluid communication with said first conduit enabling the hotter first fluid to flow through said first conduit; means for connecting said second conduit in fluid communication with a non-pressurized source of the cooler second fluid; said source of the second fluid comprising a tank in which the second fluid is stored; the input and the output of said second conduit being connected in fluid communication with the lower and the upper regions, respectively, of said tank; and said tank including a pressurized cold fluid input and hot fluid output and further comprising a mixing valve interconnected in fluid communication between said cold fluid input and said hot fluid output; whereby the second fluid thermosyphonically flows through said second conduit as the first fluid flows through said first conduit.