Patent ID: 6572370
Filing Date: 2003-06-03
Classification: F27D,F28D,Y02E,Y02P,Y10S

Abstract:
A heat regulating unit for a forced air heating system including a furnace having a fuel burner in a heat exchanger with a metal flue pipe for discharge of hot outlet combustion flue gases comprising an elongated metal flue conduit with a flue gas inlet and a flue gas outlet adapted to replace a portion of the metal flue pipe, an elongated casing surrounding the flue conduit defining an annulus between the casing and the flue conduit, and a metal heat-absorbing material filling said annulus for absorbing heat from hot flu gases during discharge from the furnace, said heat regulating unit being located in proximity to the furnace in series with the metal flue pipe and in thermal communication with the furnace heat exchanger for transfer of heat from the heat recovery unit back to the furnace when the temperature of the heat recovery unit exceeds the temperature of the furnace heat exchanger.