Patent ID: 6920918
Filing Date: 2005-07-26
Classification: F28D,F28F

Abstract:
1. A heat exchanger comprising: a plurality of elongated straight flat tubes, each formed of two identical halves joined to each other in mirror image fashion, each having opposed open ends and all arranged in a stack; at least one spacer wall within each tube and extending generally from end to end thereof to define at least two side-by-side first fluid flow paths within each tube; an elongated housing containing said stack, including a header at each of two opposed ends, each said header including a tube slot for the adjacent end of each tube in the stack, and sealed to each said adjacent end, each said at least one spacer wall having opposite ends sealed to said housing; tube spacers in said stack separating adjacent tubes in said stack from one another and endmost tubes in said stack from said housing to define a second fluid flow path around said tubes and between said endmost tubes and said housing, said tube spacers including ribs defining a serpentine flow path for said second fluid; and an opening in said housing near each end thereof and in fluid communication with said second fluid flow path.