Stoves and furnaces – Liquid heater
Patent
1976-08-23
1978-01-17
Camby, John J.
Stoves and furnaces
Liquid heater
126140, F24B 704
Patent
active
040686507
ABSTRACT:
This invention is designed to provide a multiple increase in thermal efficiency of an existing conventional fireplace. The device consists of a hollow metal air conveying channel which is designed to fit closely against the inside walls of an existing fireplace without requiring structural modification for installation. When a fire is burning in the fireplace all the exposed surfaces of the air channel become heated. The internal blower and baffle system then direct the entering cool room air to make two horizontal passes through the heated air channel before returning to the room as hot air.
To further increase heating efficiency of the air conveying channel, a flame guide radiation reflector vane connects the upper inside surfaces of the two forward facing arms of the channel. This radiation reflector vane is V-shaped in cross section with a front vertical surface that fits under the fireplace arch and a bottom surface that slants rearward and upward to guide incoming air more effectively into the fire combustion zone. This bottom surface is backed with insulation so radiant heat from the fire is not lost up the chimney throat but instead is used to raise the temperature of the air channel by means of reradiation of thermal energy from this high temperature bottom surface.
Additional improvement in overall thermal performance is secured through using a metal front closure for the fireplace. This front closure is designed to have two pairs of hinged doors with transparent panels and yield several important advantages, such as, control of air input to fire, maximum safety during untended periods of operation and significantly improved efficiency.
The whole assembly is readily insertible in an existing fireplace and does not interfere with its normal functioning. Therefore, the device is compatible with a broad range of fireplace sizes and types.
REFERENCES:
patent: 3896785 (1975-07-01), Nelson
patent: 3901212 (1975-08-01), Stites
patent: 3913558 (1975-10-01), Caldwell
patent: 3965886 (1976-06-01), Nelson
Camby John J.
Schwartz Larry I.
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