Patent ID: 7497249

Claim:
A heat exchanger assembly for cooling an electronic device comprising; a boiling chamber having a top wall and a bottom wall parallel to said top wall, a first condensing tube having an elongated width presenting an upper surface and a lower surface and extending in a first direction from said boiling chamber to a first distal end at an inclined angle relative to said bottom wall of said boiling chamber, a second condensing tube having an elongated width presenting an upper surface and a lower surface and extending in a second direction from said boiling chamber to a second distal end at said inclined angle relative to said bottom wall of said boiling chamber, a first plurality of upper air fins engaging said upper surface of said first condensing tube between said boiling chamber and a position adjacent said first distal end of said first condensing tube, a second plurality of upper air fins engaging said upper surface of said second condensing tube between said boiling chamber and a position adjacent said second distal end of said second condensing tube, a first plurality of lower air fins engaging said lower surface of said first condensing tube between said boiling chamber and a position adjacent said first distal end of said first condensing tube, a second plurality of lower air fins engaging said second condensing tube between said boiling chamber and a position adjacent said second distal end of said second condensing tube, each of said first and second pluralities of upper air fins extending upwardly successively different distances from said upper surfaces of said condensing tubes to a plane containing said top wall of said boiling chamber, and each of said lower air fins extending downwardly successively different distances from said lower surfaces of said condensing tubes to a plane parallel to said bottom wall of said boiling chamber, wherein said boiling chamber includes a first side wall and a second side wall both extending inwardly from said bottom wall to said top wall, thereby defining a substantially trapezoidal cross sectional area and a pair of end walls closing said chamber.