초록 ▼

A heat exchange device installed in a fireplace without any modification thereto completely encircling the fire, sides, top, back and bottom but without having the heating tubes and ducts exposed to the destructive concentrated heat that occurs at the fire bed level of grate or andiron and including

A heat exchange device installed in a fireplace without any modification thereto completely encircling the fire, sides, top, back and bottom but without having the heating tubes and ducts exposed to the destructive concentrated heat that occurs at the fire bed level of grate or andiron and including twin cold air ducts extending from front to rear of the fireplace at one lower corner thereof, twin hot air ducts extending from front to rear of the fireplace at the other lower corner thereof with the twin ducts interconnected by a plurality of heat exchange tubes which extend upwardly along the side walls of the fireplace and then horizontally in overlying relation to the fire in the fireplace an additional tubes extending horizontally across the bottom of the fireplace. A motor driven fan is provided in the bottom cold air duct to circulate air through the device. The twin ducts, having interconnecting apertures to the rear, include baffle arrangements to guide the flow of air through the heat exchange tubes for most efficient utilization of the heat from the fire in the fireplace. A forced draft device is incorporated into the cold air duct for selective discharge of air at the base of the fire in the fireplace to facilitate the initial burning of the fuel and to provide a forced draft for proper combustion of the fuel whenever desired. When the fire is first lit, the resulting flames hitting and passing in between and around the overhead heating tubes encircling the fire provide heat almost instantly and as the fire progressively burns, the entire length of the heating tubes, both overhead and encircling the fire on both sides and to the back, become heated providing a continuous expanded volume of hot air which is forced out into the room, away from the fireplace, this air is then circulated and again re-enters the cold air tubes by being forcibly drawn from the floor level and ejected as heated air on the opposite side of the fireplace. This results in an even room temperature, even at floor level. As the fire progressively burns, coals and ashes falling through the apertures in the conventional grate cover the heating tubes extending across the floor of the firepplace thereby extracting heat from this area of the fireplace which becomes heated last, but which also retains heat the longest, long after the fire itself has burned out.

대표청구항 ▼

A heater for installation in a fireplace comprising cold air duct means adapted to be oriented adjacent one lower corner of the fireplace, hot air duct means adapted to be oriented adjacent the other lower corner of the fireplace and adapted to extend from front to rear of the fireplace, a plurality

A heater for installation in a fireplace comprising cold air duct means adapted to be oriented adjacent one lower corner of the fireplace, hot air duct means adapted to be oriented adjacent the other lower corner of the fireplace and adapted to extend from front to rear of the fireplace, a plurality of heat exchange tubes interconnecting the cold air duct means and the hot air duct means and extending upwardly and transversely and adapted to be disposed in overlying relation to a fire in the fireplace so that heat from the fire and the products of combustion of the fire will pass over and around the heat exchange tubes for heating air passing therethrough from the cold air duct means to the hot air duct means, and means moving air through the heater from the cold air duct means, through the heat exchange tubes to the hot air duct means for discharge of hot air therefrom, said cold air duct means including twin ducts disposed in superimposed relation with communicating apertures at the rear thereof for guiding cold air rearwardly in the bottom duct, up through the apertures into the top duct, said heat exchange tubes being connected to the top duct for discharge of coldest air from the cold air duct means into the heat exchange tubes that are the hottest, thereby increasing the heat exchange efficiency of the heat exchange tubes.