| 摘要 |
A heat exchanger of the type having a stack of heat exchange units (14) each formed from first and second thin plates (30, 32) having grooves and ribs, wherein the grooves and ribs on facing surfaces of the first and second plates of a unit cross one another and co-operate to define a first flow path, and grooves and ribs on facing surfaces of first and second plates (30, 32) of adjacent units cross one another and co-operate to define a second flow path, wherein the ribs and grooves have transverse projections formed therein to provide the second flow path with a cross-sectional area exceeding the cross-sectional area of the first flow path. <IMAGE>
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