Horizontal stack type evaporator

Claim 1

A horizontal stack type evaporator comprising: a core portion having an inlet disposed at a lower part thereof and an outlet disposed at an upper part thereof; a fluid path for allowing a cooling fluid to pass through the core from the lower part to the upper part thereof, the path being a zigzag form so that the fluid passes through the core portion at least three times and comprises a stack which includes a plurality of planar tubular elements and corrugated fins alternately overlaid into a stack form, the tubular elements each having bulged sections at their opposite ends; flat tubings forming said tubular elements and communicating with the bulged sections, each flat tubing being formed by two molded plates joined along their periphery, each plate including a trough along the periphery formed by bending the periphery of the molded plate; multi-entry type inner fins arranged in said flat tubings and having a fin pitch ranging from 3.0 to 6.0 mm; each flow direction of the fluid passing through the core is comprised of a plurality of flat tubings so that a plurality of unit paths result; and the fluid path through the core has an increasingly large cross-sectional area from inlet to outlet.