Liquid cooled thermosiphon with condenser coil running in and out of liquid refrigerant

1. A fluid heat exchanger assembly for cooling an electronic device comprising;

a housing having a lower portion holding a liquid refrigerant for undergoing a liquid-to-vapor-condensate cycle within said housing and presenting a surface for liquid-to-vapor transformation, wherein said lower portion includes an interior middle portion,

said housing having an upper portion for condensing vapor boiled off said liquid refrigerant,

an inlet and an outlet disposed in said upper portion of said housing,

a tube adapted to remove heat from within said housing, wherein said tube being of a uniform cross-section disposed in said housing and extending between said inlet and said outlet for establishing a flow of cooling liquid through said housing from said inlet to said outlet,

said housing being hermetically sealed about said tube, and

a plurality of heat transfer fins disposed in said interior middle section of said lower portion of said housing for transferring heat from an electronic device disposed on the exterior of said lower portion of said housing to said liquid refrigerant, said tube being coiled in adjacent circular coils disposed on an axis parallel to said surface of said liquid refrigerant with a first sector of each coil disposed below said liquid surface and a second sector of each coil disposed above said liquid surface whereby said tube runs into and out of said liquid refrigerant, wherein said tube includes a middle and opposite ends, wherein said middle is positioned proximal to said heat transfer fins, and wherein the space between adjacent coils is greater at the ends than in the middle.