Patent ID: 6520251
Filing Date: 2003-02-18
Classification: F28D,F28F

Abstract:
A plate for stack type heat exchangers, comprising:a pair of cup portions each having a slot, the cup portions being formed on the upper portion of the plate side by side; a heat exchange portion having a plurality of small protrusions and communicating with the cup portions, the heat exchange portion being divided into two sub-portions by a central, longitudinal partition protrusion; a U-turn portion having a plurality of small protrusions, the U-turn portion being formed under the central, longitudinal partition protrusion and connecting the two sub-portions of the heat exchange portion to each other; and a flange having the same height as that of the small protrusions, said flange being formed along the edge of the plate; wherein said small protrusions are regularly arranged in a pattern of a diagonal lattice so that the ratio of the area S of the rectangle, which is defined by the longitudinal partition protrusion, the flange and two horizontal center lines passing through two neighboring small protrusion rows, to the width L of the plate falls within the range of 0.89 mm&lE;S/L&lE;1.5 mm.