Method and plate apparatus for dew point evaporative cooler

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

Patent

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F28D 5/00 (2006.01) F24F 5/00 (2006.01)

Patent

CA 2469648

An improved method and apparatus for indirect evaporative cooling of a fluid stream (1) to substantially its dew point temperature. Plate heat exchanger has perforations (11) and dry channels (3, 4) for fluid stream (1) and working gas (2) on a dry side, and wet channels (5) for working gas (2) on a wet side. There is a trough formed in a portion of the plate that temporarily holds evaporative fluid which is in contact with the wick material on the wet side surface of the plate. The evaporative fluid flows through the trough by way of liquid perforations into the next trough. The trough of a plate with a wet side up, the liquid perforations are on the side creating a reservoir to wet the opposing wick materials. As streams flow across the dry side (9), transferring heat to the plate. Working gas stream (2) flows across the dry side and through perforations to channels (5) on wet side (10), which it then cools by evaporative cooling as well as conductive and radiative transfer of heat from plate.

L'invention concerne un procédé et appareil améliorés permettant de refroidir par évaporation indirecte un flux de fluide sensiblement jusqu'à sa température de point de rosée. Un échangeur thermique à plaques présente des perforations (11) et des canaux (3, 4 et 5) à gaz sur un côté sec et sur un côté humide. Une rigole, formée dans une partie de la plaque, maintient temporairement la vapeur de fluide qui est en contact avec le matériau à effet de mèche sur la surface humide de la plaque. La vapeur de fluide circule à travers ladite rigole par le biais de perforations à liquide jusqu'à la rigole suivante. Le côté humide de la rigole d'une plaque étant orienté vers le haut, les perforations à liquide se trouvent sur le côté, de manière à créer un réservoir humidifiant les matériaux à effet de mèche opposées. A mesure que les flux circulent à travers le côté sec (9), la chaleur est transférée à la plaque. Le flux de gaz de travail (2) circule à travers le côté sec et les perforations jusqu'aux canaux (5) sur le côté humide (10). Ensuite, ce flux de gaz refroidit par évaporation et transfert conductif et radiatif de chaleur depuis la plaque.

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