Serpentined tubular heat exchanger apparatus for a...

F - Mech Eng,Light,Heat,Weapons – 24 – H

Patent

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Details

F24H 3/06 (2006.01) B23P 15/26 (2006.01) F28D 1/047 (2006.01) F28F 1/00 (2006.01) F28F 1/04 (2006.01)

Patent

CA 2081006

A fuel-fired condensing furnace is provided with a specially designed heat exchanger structure having a metal primary section and a plastic secondary or recuperative section. The primary section is defined by a horizontally spaced series of identically sized, vertically serpentined metal combustor tubes adapted to receive a throughflow of a burning fuel-air mixture discharged from the furnace burner section. Each tube has an essentially straight inlet combustion section sized to permit essentially complete combustion therein of the burning fuel-air mixture received by the tube, and a plurality of vertically spaced horizontal heat transfer sections that are horizontally flattened and narrowed to enhance their combustion heat transfer to supply air being forced upwardly through the furnace housing. The heat transfer efficiency of the flattened tube sections is further enhanced by forming spaced series of indentations in their flattened opposite side walls to create combustion gas flow turbulence within their interiors, and air flow turbulence along their exterior surfaces.

Chaudière à condensation alimentée au combustible dotée d'un échangeur thermique spécialement conçu, composé d'une partie primaire métallique et d'une partie secondaire ou de récupération plastique. La partie primaire est définie par une série de serpentins verticaux métalliques de la même dimension, horizontalement espacés, adaptés à recevoir un écoulement de mélange air-combustible enflammé évacué du brûleur de la chaudière. Chaque serpentin comprend une section de combustion à entrée fondamentalement droite pour permettre la combustion essentiellement complète du mélange air-combustible enflammé reçu dans le serpentin et plusieurs sections de transfert de chaleur horizontales espacées verticalement qui sont aplaties horizontalement et rétrécies pour augmenter leur transfert de chaleur de combustion à l'air poussé vers le haut à travers le boîtier de la chaudière. L'efficacité du transfert de chaleur des sections de tubes aplatis est augmentée par la formation de séries de dentelures espacées dans leurs parois latérales opposées aplaties pour créer une turbulence de l'écoulement des gaz de combustion à l'intérieur et une turbulence de la circulation de l'air le long de leur surface extérieure.

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