Interleaved, immersion-cooling apparatuses and methods for cooling electronic subsystems

A liquid-cooled electronics rack comprising:

• an electronics rack comprising an electronic subsystem, the electronic subsystem comprising a plurality of electronic components;
• and
• a cooling apparatus for immersion-cooling of the plurality of electronic components of the electronic subsystem, the cooling apparatus comprising:
• a housing at least partially surrounding and forming a sealed compartment about the electronic subsystem, including the plurality of electronic components to be cooled;
• a dielectric fluid disposed within the sealed compartment, wherein the electronic subsystem's plurality of electronic components to be cooled are immersed within the dielectric fluid;
• a heat spreader coupled to at least one electronic component of the plurality of electronic components to be cooled, the heat spreader comprising multiple fluid-boiling fins extending therefrom within the sealed compartment;
• and
• a liquid-cooled vapor condenser, the liquid-cooled vapor condenser comprising a plurality of thermally conductive condenser fins extending within the sealed compartment, wherein multiple thermally conductive condenser fins of the plurality of thermally conductive condenser fins are interleaved within the sealed compartment with the multiple fluid-boiling fins of the heat spreader coupled to the at least one electronic component of the plurality of electronic components immersed within the dielectric fluid.