Abstract: A plate type heat exchanger includes a heat transfer assembly having a plurality of heat transfer cells stacked in multiple layers, first fluid passages, and second fluid passages between the heat transfer cells so as to intersect with the first fluid passage at a right angle and to exchange heat with the first fluid passages, a framework having a plurality of support beams connected between a pair of sealing panels facing opposite outer faces of the heat transfer assembly, and an elastic support having first elastic members installed between the sealing panels and the heat transfer assembly and second elastic members installed between the support beams and the heat transfer assembly, absorbing thermal expansion of the heat transfer assembly, and preventing fluids from leaking out.

Abstract: A heat transfer cell includes first and second heat transfer plates which have first and second heat transfer areas, and first and second flanges bent from the first and second heat transfer areas so as to have a height difference with respect to the first and second heat transfer areas. The first and second heat transfer plates are joined into a cell body so as to be opposite to each other in a mirror image, and the cell body having a first fluid passage therein, weld lines formed along the first contacting each other and along the second flanges contacting each other, and external recesses formed outside the heat transfer areas for second fluid passages intersecting with the first fluid passage at a right angle.