Patent ID: 7370691
Filing Date: 2008-05-13
Classification: B60H,F28D,F28F

Abstract:
1. A heating or air conditioning unit, comprising: a first plate-type heat exchanger, said first plate-type heat exchanger comprising: a plurality of stacked plates, with respective adjacent plates forming pairs of plates, the plates of the pairs being joined together to define a plurality of first flow channels therebetween for carrying a first heat exchange medium; at least a first passage aperture for the first heat exchange medium; and fins arranged between neighboring pairs of said plates, said fins and at least one of said neighboring pairs of plates forming a plurality of second flow channels for carrying a second heat exchange medium, wherein each of said second flow channels is of increasing length with increasing radial distance from said passage aperture, wherein said first heat exchanger is an evaporator, and the heating or air conditioning unit further comprising a second heat exchanger arranged downstream of said evaporator, wherein said second heat exchanger comprises: a plurality of stacked plates, with respective adjacent plates forming pairs of plates, the plates of the pairs being joined together to define a plurality of third flow channels therebetween for carrying a third heat exchange medium; and fins arranged between neighboring pairs of said plates, said fins and at least one of said neighboring pairs of plates forming a plurality of fourth flow channels for carrying a fourth heat exchange medium; wherein said fins are shaped such that the fourth heat exchange medium has a general flow direction in said fourth flow channels that is changed as it flows through the second heat exchanger.