Condensing heat exchanger with double bundle of tubes

Details Condensing heat exchanger with double bundle of tubes Condensing heat exchanger with double bundle of tubes

F - Mech Eng,Light,Heat,Weapons

24

H

F24H 1/43 (2006.01) F24H 1/16 (2006.01) F28D 7/02 (2006.01)

Patent

CA 2493393

The invention relates to a heat exchanger comprising a pair of tube bundles (21, 31) through which the fluid to be heated flows, one primary bundle (21) surrounding a cylindrical burner (40) and the other secondary bundle (31) on which the water steam contained in the combustion gas exhausting from the primary bundle is condensed, whereby the tubes forming the bundles have a flattened section and a helicoidal shape, such that the combustion gas flow between the coils, from the inside to the outside for the primary bundle (21) and in the reverse order for the secondary bundle (31), both bundles being arranged inside a same shell (1). Said heat exchanger is characterised in that the axial dimension (l2) of the secondary bundle is substantially smaller than the axial dimension (I1) of the primary bundle, such that an available space for an exhaust trunking (7) is provided at the end of said secondary bundle (31). The present invention also relates to a gas- or oil-fired boiler, especially for domestic application, with high efficiency, space saving and reduced weight.

Cet échangeur comporte une paire de faisceaux tubulaires (21, 31) parcourus par le fluide à réchauffer, l'un primaire (21) qui entoure un brûleur cylindrique (40), l'autre secondaire (31) sur lequel s'opère une condensation de la vapeur d'eau contenue dans les gaz brûlés s'échappant du faisceau primaire, les tubes constituant les faisceaux ayant une section aplatie et étant conformés en hélice de sorte que les gaz brûlés passent entre les spires, de l'intérieur vers l'extérieur pour le faisceau primaire (21), et en sens inverse pour le faisceau secondaire (31), les deux faisceaux étant montés à l'intérieur d'une même enveloppe (1); il est remarquable en ce que la dimension axiale (12) du faisceau secondaire est sensiblement plus faible que celle (I1) du faisceau primaire, de sorte qu'est ménagé à l'extrémité du faisceau secondaire (31) un espace disponible pour y monter une manchette d'évacuation (7). Chaudière à gaz ou à fioul, notamment à usage domestique, à rendement élevé d'encombrement et de poids réduits.

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