| 摘要 |
PROBLEM TO BE SOLVED: To obtain proper values of a dimension of a recessed groove of a plate-shaped body composing a multi-plate type heat exchanger and an interval thereof from the adjacent plate-shaped body. SOLUTION: In a multi-plate type heat exchanger 20 made up of a plurality of elements laminated, concaves and convexes are each made up of a concave groove 3a and a protruded stripe 2a and the recessed groove 3a is formed into an equi-two dimensional curvature groove in the shape of the cross section thereof which makes the element 10 have two plate-shaped bodies 1 and 1 mutually laminated by shifting the pitch of each concave and convex of the two plate-shaped bodies 1 and 1 by 1/2. Then the depth of the recessed groove 3a is represented by Sht, the pitch Wpt and an interval between adjacent two plate-shaped bodies 1 and 1 demarcating a path 21 between the elements 10 (interval between groove bottoms), the dimensions meet the requirement of 0.8 mm<Wpt<1.6 mm, preferably Wht=1.2 mm or so, 4.8 mm<Wpt<6.8 mm, preferably Wpt=5.8 mm or so and 2.9 mm<Ppt<4.9 mm, preferably Ppt=4.0 mm-4.5 mm.
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