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US 12,669,266 B2Granted
Furnace
AssigneeFire Chief Industries LLC
InventorsDanny N. Haynes, Gregory A. Miller
Life of this patent
Estimating the term…
Abstract
A furnace including a combustion chamber for burning fuel can have increased fuel burning efficiency, increased heating efficiency, and decreased harmful emissions of combustion byproducts. A combustion air delivery system delivers primary and secondary combustion air to the combustion chamber. Primary and secondary combustion air may be delivered at amounts that increase burning efficiency. An amount of secondary combustion air can be controlled by a valve system. A heat transfer device efficiently transfers heat from products of combustion for heating an enclosed space.
Claims20
A forced-air furnace for increasing a temperature of heating air delivered to a space, the furnace comprising:
- a housing having a top, bottom, front, rear, and opposite sides;
- a firebox in the housing having a combustion chamber adapted for receiving and burning fuel to produce heated products of combustion;
- a combustion air delivery system for delivering combustion air to the combustion chamber, the combustion air delivery system including:
- a primary combustion air passage including a primary combustion air inlet extending through the housing, said primary combustion air passage including a portion extending downward adjacent to the firebox to a primary combustion air outlet in a lower half of the combustion chamber for delivering primary combustion air to the combustion chamber at a primary combustion air flow rate,
- a secondary combustion air passage including an elongated secondary combustion air duct longitudinally oriented between the front of the housing and the rear of the housing to a secondary combustion air outlet positioned in the combustion chamber above the primary combustion air outlet for delivering secondary combustion air to the combustion chamber at a secondary combustion air flow rate, and
- a valve system configured for changing a ratio of primary combustion air flow rate to secondary combustion air flow rate delivered to the combustion chamber;
- a post-combustion plenum positioned above the combustion chamber, said post-combustion chamber being adapted to receive products of combustion from the combustion chamber and to transport the products of combustion to a combustion products exit;
- and
- a heating air duct for carrying heating air entering from outside the housing upward between the firebox and the housing and across at least a portion of the post-combustion plenum to increase the temperature of the heating air carried by the heating air duct.
6 more elements
A forced-air furnace for increasing a temperature of heating air delivered to a space, the furnace comprising:
- a housing having a top, bottom, front, rear, and opposite sides;
- a firebox in the housing having a combustion chamber adapted for receiving and burning fuel to produce heated products of combustion, the combustion chamber extending laterally between the opposite sides of the housing and including an opening for loading fuel into the combustion chamber;
- a combustion air delivery system for delivering combustion air to the combustion chamber, the combustion air delivery system including:
- a primary combustion air passage including a primary combustion air inlet extending through the housing, said primary combustion air passage including a portion extending downward adjacent to the firebox to a primary combustion air outlet in the combustion chamber below the combustion chamber opening for delivering primary combustion air to the combustion chamber at a primary combustion air flow rate,
- a secondary combustion air passage including an elongated secondary combustion air duct laterally centered in the combustion chamber and longitudinally oriented between the front of the housing and the rear of the housing to a secondary combustion air outlet positioned in the combustion chamber above the primary combustion air outlet for delivering secondary combustion air to the combustion chamber at a secondary combustion air flow rate, and
- a valve system configured for changing a ratio of primary combustion air flow rate to secondary combustion air flow rate delivered to the combustion chamber;
- a post-combustion plenum positioned above the combustion chamber, said post-combustion chamber being adapted to receive products of combustion from the combustion chamber and to transport the products of combustion through a section extending in a direction extending between a front of the housing and the rear of the housing to a combustion products exit extending through the rear of the housing;
- and
- a heating air duct for carrying heating air entering from outside the housing upward between the firebox and the opposite sides of the housing and across at least a portion of the post-combustion plenum to increase the temperature of the heating air carried by the heating air duct.
6 more elements
Dependencies are inferred from the claim text.