Patent ID: 8210246

Claim:
A heat exchanger assembly for heat transfer comprising; a pair of outer headers each extending between a first outer header end and a second outer header end and defining an outer cavity, each of said outer headers disposed in spaced relationship to one another, a pair of inner headers each extending between a first inner header end and a second inner header end and defining an inner cavity, each inner header disposed in one of said outer headers, each of said headers defining a plurality of header slots axially spaced from one another between said header ends thereof, a plurality of first fluid tubes each extending between said outer headers from one of said header slots of each outer header to fluidly interconnect said outer cavities defined by said outer headers, a plurality of second fluid tubes each extending between said outer headers, and each of said second fluid tubes extending through one of said header slots of each outer header and through the associated outer cavity and to one of said header slots of each inner header to fluidly interconnect said inner cavities defined by said inner headers, a pair of inner end caps each hermetically sealed to one of said inner header ends of each inner header wherein said inner end cap hermetically sealed to said second inner header end of each inner header defines an inner aperture in fluid communication with the associated inner cavity, a pair of outer end caps each hermetically sealed to one of said outer header ends of each outer header wherein said outer end cap hermetically sealed to said first outer header end of each outer header defines an outer aperture in fluid communication with the associated outer cavity, whereby a first fluid flow through one of said outer cavities defined by the associated outer header and through said first fluid tubes and through the other of said outer cavities defined by the other of said outer headers and a second fluid flow through one of said inner cavities defined by the associated inner header and surrounded by the associated outer header and through said second fluid tubes and through the other of said inner cavities defined by the other of said inner headers and surrounded by the other of said outer headers and a third fluid flow across said fluid tubes for transferring heat from the first and second fluids to the third fluid, wherein said first fluid tubes extend in a spaced relationship with one another and wherein said second fluid tubes are interleaved with said first fluid tubes such that said second fluid tubes and said first fluid tubes are arranged in an alternating arrangement wherein said second fluid tubes includes opposing second fluid tube ends terminating in said inner cavities.