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

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

1979-03-23

1981-05-19

Tapolcai, Jr., William E.

Heat exchange

Tubular structure

Projecting internal and external heat transfer means

138 38, 165DIG2, 181264, F28F 140

Patent

active

042678846

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: 373564 (1887-11-01), Meeze
patent: 1233558 (1917-07-01), Curtis
patent: 1377970 (1921-05-01), Parent
patent: 1922848 (1933-08-01), Harley
patent: 2608968 (1952-09-01), Moseley
patent: 3232341 (1966-02-01), Woodworth
patent: 3381746 (1968-05-01), Wiegmann et al.
patent: 3770081 (1973-11-01), Martin

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