Heat exchanger for providing supercritical cooling of a...

F - Mech Eng,Light,Heat,Weapons – 28 – D

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Details

F28D 1/047 (2006.01) F28F 1/02 (2006.01) F28F 1/12 (2006.01) F25B 9/00 (2006.01)

Patent

CA 2467137

Heat exchanger (10) for providing supercritical cooling to the refrigerant of a transcritical cooling system (12) including a pair of elongated headers (20, 22) plurality of elongated tubes (28) spaced in side-by-side relation along the longitudinal axes (24, 26) of the headers (20, 22), and serpentine fins (30) extending between adjacent pairs of the tubes. Each of the tubes (28) is folded upon itself to define at least two parallel legs (36) of the tubes (28) and has a flattened cross-section. The parallel legs (36) of the tubes (28) are preferably spaced from each other, with the major dimension D of each of the parallel legs lying in a common plane. Each of the fins (30) includes alternating tabs (40) and elongated separations (42) extending parallel to the parallel legs (36) and located between the parallel legs (36) of the adjacent tubes (28) to divide the width (W) of each fin (30) into discrete fin elements (44) that are connected to each other by the tabs (40). Each of the fin elements (44) extends along one of the parallel legs (36) of the adjacent tubes (28).

L'invention concerne un échangeur de chaleur (10) permettant un refroidissement surcritique du fluide frigorigène d'un système de refroidissement transcritique (12). Cet échangeur de chaleur comprend une paire de collecteurs allongés (20, 22), une pluralité de tubes allongés (28) séparés, disposés côte-à-côte, le long des axes longitudinaux (24, 26) des collecteurs (20, 22), et des ailettes de serpentin (30) s'étendant entre des paires de tubes adjacentes. Chaque tube (28) est replié sur lui-même pour définir au moins deux montants parallèles (36) de tubes (28), et présente une section transversale aplatie. Les montants parallèles (36) de tubes (28) sont de préférence séparés, la dimension principale (D) de chaque montant parallèle se situant sur un plan commun. Chaque ailette (30) comprend des languettes (40) qui alternent, et des séparations allongées s'étendant parallèlement aux montants parallèles (36), et sont situées entre les montants parallèles (36) de tubes adjacents (28) pour diviser la largeur (W) de chaque ailette (30) en éléments (44) d'ailette discrets connectés les uns aux autres au moyen de languettes (40). Chaque élément d'ailette (44) s'étend le long d'un montant parallèle (36) de tubes adjacents (28).

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