Woodstove for heated air forced into a secondary combustion chamber and method of operating same
AssigneeThe United States of America as represented by the Administrator of the U.S. Environmental Protection Agency
InventorsRobert E. Hall, Graig A. Spolek, John H. Wasser, Nelson L. Butts
Life of this patent
Estimating the term…
Abstract
A resistance heater heats air forced by a fan into a woodstove secondary combustion chamber having an ignitor. The fan, heater and ignitor are controlled by a temperature sensor for gas flowing from a primary combustion chamber to a secondary combustion chamber. Two ignitors, extending through the stove back wall into the secondary combustion chamber, are controlled by the temperature sensor.
Claims43
A woodstove comprising a primary combustion chamber for receiving a load of wood fuel, a secondary combustion chamber in fluid flow relation with the primary chamber, fan means for forcing air from outside the woodstove into the secondary chamber, the air from outside the woodstove forced into the secondary chamber being heated prior to entering the secondary chamber, and means for controlling the fan means in response to the temperature of gases in the secondary chamber.
A secondary combustion chamber for gases exhausted from a primary combustion chamber of a woodstove, comprising fan means for forcing air from outside the woodstove into the secondary combustion chamber, the air from outside the woodstove forced into the secondary chamber being heated prior to entering the secondary chamber, and means responsive to the temperature of gases flowing from the primary chamber to the secondary chamber for controlling the fan means.
A woodstove comprising a primary combustion chamber for receiving a load of wood fuel, a secondary combustion chamber in fluid flow relation with the primary chamber, fan means for forcing air from outside the woodstove into the secondary chamber, and means responsive to a source other than from heat produced by the woodstove for heating the air forced by the fan means into the secondary chamber prior to the forced air entering the secondary chamber.
A method of operating a woodstove having a primary combustion chamber for receiving a load of wood fuel and a secondary combustion chamber in fluid flow relation with the primary chamber, the method comprising forcing air from outside the woodstove into the secondary chamber, and heating the forced air with a heat source other than heat produced by the woodstove prior to the forced air being supplied to the secondary chamber.
Dependencies are inferred from the claim text.