Clamshell heat exchanger for a furnace or unit heater

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

Patent

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Details

F28F 3/14 (2006.01) F24H 3/10 (2006.01) F28D 1/03 (2006.01) F28D 9/00 (2006.01)

Patent

CA 2247765

A clamshell heat exchanger (10) is provided for use in a heating apparatus including a burner for producing hot combustion gas. The heat exchanger (10) defines a multi-pass flow passage (11) for the combustion gas and includes a first plate member (30) and a second plate member (32). The first plate member (30) has a first series of parallel ridges (36) and valleys (38a-b), with at least one of the valleys (38a) being deeper than other of the valleys (38b). The second plate member (32) faces the first plate member (30) and includes a second series of ridges (36) and valleys (38a-b) that are parallel to the first series of ridges (36) and valleys (38a-b), with at least one of the valleys (38a) of the second series being deeper than other of the valleys (38b) of the second series. A first pass (14, 16) of the multi-pass flow passage (11) is defined by a number N1 of the ridges (36) and valleys (38a-b) of the first and second series. A second pass (16,18) of the multi-pass flow passage (11) is defined by a number N2 of the ridges (36) and valleys (38a-b) of the first and second series. The at least one deeper valley (38a) of the first series cooperates with the at least one deeper valley (38a) of the second series to separate the second pass (16, 18) from the first pass (14,16).

Echangeur de chaleur (10) en deux parties utilisé dans un appareil de chauffage comprenant un brûleur servant à produire un gaz de combustion chaud. L'échangeur de chaleur (10) délimite un passage (11) à plusieurs passages d'écoulement pour les gaz de combustion et comprend une première plaque (32). Le premier élément (30) de la plaque comporte une première série de crêtes parallèles (36) et de creux (38 a - b), parmi lesquels au moins un creux (38 a) est plus profond que les autres creux (38 b). Le deuxième élément (32) de la plaque fait face au premier élément (30) de la plaque et comprend une deuxième série de crêtes (36) et de creux (38 a - b) qui sont parallèles à la première série de crêtes (36) et de creux (38 a - b), parmi lesquels au moins un des creux (38 a) de la deuxième série est plus profond que les autres creux (38 b) de la deuxième série. Un premier passage (14, 16) du passage (11) à passages multiples est défini par un nombre N1 de crêtes (36) et de creux (38 a - b) des première et deuxième séries. Un deuxième passage (16, 18) du passage (11) à passages multiples est défini par un nombre N2 de crêtes (36) et de creux (38 a - b) des première et deuxième séries. Le creux le plus profond (38 a) de la première série coopère avec le creux le plus profond (38 a) de la deuxième série pour séparer le deuxième passage (16, 18) du premier passage (14, 16).

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