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A fluid heat exchanger assembly cools an electronic device with a cooling fluid supplied from a heat extractor (R, F) to a plurality of tubes extending between header tanks in an upper portion of a housing. A refrigerant is disposed in the lower portion of the housing for liquid-to-vapor transforma

A fluid heat exchanger assembly cools an electronic device with a cooling fluid supplied from a heat extractor (R, F) to a plurality of tubes extending between header tanks in an upper portion of a housing. A refrigerant is disposed in the lower portion of the housing for liquid-to-vapor transformation. The tubes are radially flexible to vary the volume of the tubes for modulating the flow of coolant liquid through the tubes in response to heat transferred by an electronic device to the lower portion of the housing.

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What is claimed is: 1. A fluid heat exchanger assembly for cooling an electronic device with a cooling fluid supplied from a heat extractor (R, F) and comprising; a housing having an inlet and an outlet and an upper portion and a lower portion with said inlet and said outlet being in said upper por

What is claimed is: 1. A fluid heat exchanger assembly for cooling an electronic device with a cooling fluid supplied from a heat extractor (R, F) and comprising; a housing having an inlet and an outlet and an upper portion and a lower portion with said inlet and said outlet being in said upper portion, a plurality of tubes extending between said inlet and said outlet for establishing a flow of coolant liquid from said inlet to said outlet in said upper portion, said housing being hermetically sealed about said tubes, a refrigerant disposed in said housing for liquid-to-vapor transformation, each of said tubes defining a cross section having a generally hour-glass shape with a waisted middle and being radially flexible to vary the volume of said tubes for modulating the flow of coolant liquid through said tubes in response to heat transferred by an electronic device to said lower portion of said housing. 2. An assembly as set forth in claim 1 including inlet and outlet header tanks in fluid communication with opposite ends of said tubes. 3. An assembly as set forth in claim 1 wherein said tubes comprise a thin gage metal. 4. An assembly as set forth in claim 1 including heat transfer fins disposed in said lower portion of said housing for transferring heat from an electronic device disposed on the exterior of said lower portion of said housing. 5. An assembly as set forth in claim 1 wherein said upper portion of said housing is generally rectangular and said lower portion of said housing is generally rectangular and coextensive with said upper portion. 6. An assembly as set forth in claim 5 wherein said header tanks are disposed on opposite sides of said upper portion to overhang said lower portion. 7. An assembly as set forth in claim 1 wherein said upper portion of said housing surrounds said tubes so that said tubes are surrounded by vapor state of the refrigerant. 8. A method of cooling an electronic device comprising the steps of; generating heat by an electronic device, transferring the heat generated by the electronic device to the lower portion of a housing, disposing a refrigerant in the lower portion of the housing for liquid-to-vapor transformation, and flowing coolant liquid through a plurality of radially flexible tubes in an upper portion of the housing, said tubes defining a cross section having a generally hour-glass shape with a waisted middle and radially flexing to vary the volume of the tubes for modulating the flow of coolant liquid through the tubes in response to heat transferred by an electronic device to the lower portion of the housing.