Counterflow heat exchanger with floating plate

Claim 1

A counterflow type floating plate heat exchanger comprising an enclosing frame including a pair of parallel rectangular wall members and four corner members connecting the pair of wall members at least at corresponding corners; four pieces of seal strips in contact with an inside surface of the corner members through resilient members for sealing at least the inside surface of each corner member, a pair of seal strips at diagonal positions with respect to a line connecting respective centers of the wall members being extended along a pair of planes defined by longer sides of the wall members and the corner members so that the planes are sealed leaving unsealed portions thereof to serve as entrances or exits; at least three separate parallel floating plates, mounted, in parallel to the wall members and in contact with the seal strips, within a space defined by the seal strips and the wall members; spacer means for maintaining a spacing between the floating plates for channels defined between the floating plates; and control means for evenly diffusing and aligning the flow of fluids in the channels; in which fluids which are different in temperature respectively flow in adjacent channels on opposite surfaces of each floating plate and heat exchange is realized between the fluids through each floating plate, and wherein the fluids which are different in temperature flow in directions opposite to each other and along the direction of the longer sides in a predetermined portion of the channels.