Patent ID: 7604040

Claim:
A fluid heat exchanger unit for cooling an electronic device and comprising; a cooling housing having a liquid coolant inlet for receiving liquid coolant from the system and a liquid coolant outlet and an upper portion and a lower portion with said liquid coolant inlet and said liquid coolant outlet being in said upper portion, a partition dividing said cooling housing into said upper portion, with said upper portion having an upper wall, and said lower portion for establishing a direction of liquid coolant flow in a coolant passage from said liquid coolant inlet to said liquid coolant outlet in said upper portion between said partition and said upper wall, a refrigerant disposed in said lower portion of said cooling housing for liquid-to-vapor transformation, said cooling housing being hermetically sealed about said partition to separate said refrigerant in said lower portion from the liquid coolant in said upper portion, and a heat rejecter disposed on and above said upper wall of said cooling housing with a rejecter inlet adjacent and in fluid communication with said liquid coolant outlet and a rejecter outlet adjacent said liquid coolant inlet for returning liquid coolant to the system, wherein said upper wall of said cooling housing includes a filler material for providing a common wall with a flat surface for integration of said heat rejecter, and wherein said heat rejecter includes at least one layer of first air fins and at least one layer of first tubes for conducting liquid coolant from said rejecter inlet to said rejecter for transferring heat from said first tubes to said first air fins.