Heat recovery device for use in return air duct of forced air fu

Stoves and furnaces – Heat accumulator structures

Patent

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Details

165179, 165DIG2, 138 38, F24H 700

Patent

active

042326540

ABSTRACT:
An especially compact, highly efficient heat recovery device for use in the cool air return duct of a heating system may be easily installed in existing flue pipes and transfers the ordinarily wasted heat in the exhaust gases flowing through the flue pipe to the cool return air thereby preheating the latter and increasing the efficiency of the heating system. The device includes a three stage heat transfer structure housed within a heat conductive tubular member which cooperate to transfer heat away from the gases into the cool return air by means of conduction, convection and radiation processes. A first stage deflects a portion of the gases toward and into heat exchanging contact with the sidewalls of the tubular member and directs the remaining portion into a gas pervious heat storage trap which comprises the second stage. The third stage includes a perforated, heat deflecting and radiating cone structure which cooperates with the first and second stages to produce temperature stratification within the tubular member to further increase heat transfer to the cool return air.

REFERENCES:
patent: 1143902 (1915-06-01), Haberkorn
patent: 1734274 (1929-11-01), Schubart
patent: 2468909 (1949-05-01), Yeager et al.
patent: 3825063 (1974-07-01), Cowans
patent: 3981356 (1976-09-01), Granetzke
patent: 4016928 (1977-04-01), Bartels et al.

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