Patent ID: 8184436
Filing Date: 2012-05-22
Classification: H05K

Abstract:
1. A liquid-cooled electronics rack comprising: a plurality of immersion-cooled electronic subsystems, each immersion-cooled electronic subsystem comprising: a vapor-condensing heat exchanger to facilitate condensing of the dielectric fluid vapor egressing from the sealed compartments of the plurality of immersion-cooled electronic subsystems; a dielectric fluid vapor return manifold coupling in fluid communication the dielectric fluid vapor outlets of the plurality of immersion-cooled electronic subsystems and the vapor-condensing heat exchanger; a reservoir for holding the dielectric fluid, the reservoir being disposed at a lower height than the vapor-condensing heat exchanger; a gravity drain line coupled to drain dielectric fluid condensate from the vapor-condensing heat exchanger to the reservoir; an immersed, sub-cooling heat exchanger disposed within the reservoir for cooling the dielectric fluid, the immersed, sub-cooling heat exchanger being coupled in series fluid communication with the vapor-condensing heat exchanger, wherein chilled facility coolant passes through the immersed, sub-cooling heat exchanger and then the vapor-condensing heat exchanger; a dielectric fluid supply manifold coupling in fluid communication the reservoir and the dielectric fluid inlets of the plurality of immersion-cooled electronic subsystems; and a pump associated with the reservoir for pumping under pressure the dielectric fluid from the reservoir to the dielectric fluid supply manifold for maintaining the dielectric fluid in a liquid state within the sealed compartments of the plurality of immersion-cooled electronic subsystems.