Heat exchange – Geographical
Patent
1992-04-03
1993-08-24
Davis, Jr., Albert W.
Heat exchange
Geographical
405131, 16510421, F23D 1502, E02D 311
Patent
active
052380530
ABSTRACT:
A road surface is warmed by means of a two-phase thermosyphon with an easily vaporizable liquid partially filling a sealed container. A portion of the container serves as a condenser and another portion as an evaporator. If at least a portion of the evaporator is above the boiling point of the liquid, the liquid will boil and the vapor will rise into the condenser part of the thermosyphon, and if the condenser part is in an environment below the condensing temperature of the vapor, the vapor will condense, thereby radiating heat and warming the surrounding environment. The condenser is elongated and installed underground so as to lie closely beneath the road surface. A thermally insulating layer is provided below the condenser part so as to more efficiently utilize the radiated heat. The evaporator may be of a double-tube structure such that the liquid can flow through the entire length thereof even if these tubes include rising and falling sections. A plurality of such thermosyphons and the insulating layer may be used together as a prefabricated panel.
REFERENCES:
patent: 3195619 (1965-07-01), Tippmann
patent: 3217791 (1965-11-01), Long
patent: 3976125 (1976-08-01), Best
patent: 4050509 (1977-09-01), Bienert et al.
patent: 4162394 (1979-07-01), Faccini
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