Stoves and furnaces – Hot-air furnaces – Air moisteners
Patent
1975-09-22
1977-10-18
Nilson, Robert G.
Stoves and furnaces
Hot-air furnaces
Air moisteners
F24F 314
Patent
active
040541223
ABSTRACT:
The specification discloses a humidifier for connection to a hot gas furnace having gas burners for heating air to be discharged through a plenum chamber and having a hot waste gas vent pipe for venting heated waste gas. The humidifier includes a housing which is substituted for a section of the hot waste gas vent pipe. A coil is disposed within the housing for directing water through the hot waste gas vent pipe so that the coil is heated from ambient temperature to a predetermined operating temperature by the waste gas thereby vaporizing the water into steam. The coil material has a substantial coefficient of thermal expansion so that the coil substantially expands and contracts as its temperature changes thereby separating sediment from the interior thereof. The coil has an inside dimension larger than the cross-sectional dimension of the vent pipe so that the flow of hot gases through the housing is not inhibited by the coil. Fluid from the water receiving coil, together with any sediment carried thereby, is separated in a sediment separation zone. A drain extending into the sediment separation zone periodically removes excess liquid accumulating therein. A control is provided for permitting the flow of water into the coil for a preset time after heated waste gas has ceased being vented through the waste gas vent pipe so that the coil is cooled and sediment flushed therefrom.
REFERENCES:
patent: 2059408 (1936-11-01), Stark
patent: 2133599 (1938-10-01), Turney
patent: 3215416 (1965-11-01), Liben
patent: 3294081 (1966-12-01), Zach
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