Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1983-09-09
1985-03-19
Yeung, James C.
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
126437, 126418, 126434, F24J 302
Patent
active
045052620
ABSTRACT:
A passive solar water heater includes a heat exchanger having concentric pipes for providing heat transfer by convective, counterflow action. The inner pipe includes reducer elements at each end. The reduced pipe extends through resilient annular grommets in the caps closing the ends of the outer pipe. The resilient grommets provide watertight seals with the weight of the heat exchanger providing the pressure necessary for maintaining the seal of the lower grommet. An air space is also provided in the outer pipe for the expansion and contraction of the working fluid. A check valve between the solar collector and heat exchanger prevents the reverse flow of working fluid. A resilient, heat conductive S-insert is provided in the inner concentric pipe to increase the heat exchange surface area and improve performance. The insert is removable for ease of cleaning. Finally, a high temperature limit bypass protects the solar collector from damage caused by excessively high temperatures of the working fluid.
REFERENCES:
patent: 1250260 (1917-12-01), Wilcox
patent: 1425174 (1922-08-01), Cartter et al.
patent: 4044948 (1977-08-01), Bottum et al.
patent: 4050508 (1977-09-01), Buckley
patent: 4157706 (1979-06-01), Gaskill
patent: 4235325 (1980-11-01), Miller
patent: 4413615 (1983-11-01), Sigworth, Jr.
Hot Water-Day and Night, p. 135, Solar Age, Aug., 1981, Todd H. Brown, pp. 20-21.
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