A rack with two-phase loop recirculation includes a supply manifold, a return manifold, and a separator. For example, a supply manifold is configured to receive two-phase cooling fluid from a cooling fluid source to distribute the two-phase cooling fluid to one or more server chassis. The two-phase cooling fluid is to extract heat from the one or more electronic devices and to transform into two-phase mixing fluid having at least a portion of the two-phase fluid transformed into vapor. A return manifold is configured to receive the two-phase mixing fluid from one or more loops associated with one or more electronic devices of the server chassis. A separator disposed on the return manifold is configured to separate the vapor of the two-phase mixing fluid and to divert first remaining two-phase cooling fluid of the two-phase mixing fluid directly back to the supply manifold through a return loop.

Embodiments disclosed include a heat exchange apparatus and method comprising, in an electronic device, a first heat exchanger for exchanging heat with the device wherein the heat exchanger comprises a flow duct for receiving a fluid, and at least a portion of the flow duct is arranged for thermal communication with the device. Preferred embodiments include a pressure reducing unit comprising a pump associated with the flow duct and a Venturi tube configured for reducing the pressure of the fluid in the portion of the flow duct arranged in thermal communication with the device and less than the pressure external to the duct. An embodiment includes a fluid reservoir, and a second heat exchanger for removing heat from the fluid reservoir wherein the second heat exchanger comprises an evaporator in a refrigerant system through which refrigerant is passed in a closed loop via an expansion valve from a gas cooler and back into a compressor.

A liquid immersion cooling apparatus that cools an electronic device including a heat generating element, the apparatus includes a liquid immersion tank that accommodates a cooling liquid and the electronic device to be immersed in the cooling liquid, a wall that is disposed within the liquid immersion tank, the wall having a protrusion protruding toward the electronic device, and a drive mechanism that moves a position of the protrusion along the electronic device.

A modular data center includes a fan creating a first cooling wind from outside air, an air conditioner creating a second cooling wind having a temperature lower than that of the outside air, racks housing electronic devices that take in the first and the second cooling wind, and a control unit adjusting an air volume of the first cooling wind by controlling the fan, and so as to cool the electronic device to a specified temperature. The control unit executes stopping the air conditioner when a first assumed value of a sum of air-conditioning power of the air conditioner and the fan is smaller than a current value of the air-conditioning power, and operating the air conditioner when a second assumed value of the sum of air-conditioning power of the air conditioner and the fan is smaller than the current value of the air-conditioning power.

The description relates to passive two-phase immersion cooling of computers, such as servers. One example can include multiple liquid immersion tanks configured to contain servers immersed in a liquid-phase of a coolant having a boiling point below a maximum operating temperature of the servers such that operation of the servers generates heat that is transferred to the liquid phase of the coolant and causes a portion of the coolant to boil to a gas phase of the coolant. The example can include a single phase separator tank and a single heat exchanger coupled to the multiple liquid immersion tanks as a sealed cooling system and configured to receive the gas phase of the coolant and configured to transition the gas phase of the coolant back to the liquid phase of the coolant and to automatically deliver liquid phase of the coolant to an individual liquid immersion tank responsive to further boiling producing additional gas phase of the coolant that evacuates the individual liquid immersion tank.

Embodiments disclosed include a data center comprising a first reconfigurable utility module comprising interfaces for facilitating electrical power supply, data connectivity, and cooling media supply, and further comprising a plurality of interfaces through which components may be connected to said first reconfigurable utility module. Additionally, a plurality of server modules are connected to the reconfigurable utility module through the interfaces, each of said server modules comprising one or more racks of servers, each of said server modules receiving said power supply, said data connectivity, and said cooling media through an interface through which it is connected to said reconfigurable utility module. Embodiments include one or more second reconfigurable utility modules, each of the one or more second reconfigurable utility modules being connected to the data center by: (a) being attached to one of said server modules; or (b) being attached to another one of the second reconfigurable utility modules; or (c) being attached to said first reconfigurable utility module, a first one of said second reconfigurable modules being extensible to accommodate an additional number of modules, and being reducible to accommodate fewer modules.

A perfluorinated 1-alkoxypropene represented by general Formula (I), compositions that include such compounds, and methods and systems that include such compositions are provided, wherein Formula (I) is represented by: R.sub.fO—CF═CFCF.sub.3 wherein R.sub.f is a linear, branched, or cyclic perfluoroalkyl group having 2 to 10 carbon atoms and optionally further including 1 to 3 nitrogen and/or 1 to 4 oxygen catenary heteroatoms.

A two-phase liquid immersion cooling system is described in which heat generating computer components cause a dielectric fluid in its liquid phase to vaporize. Advantageously, a pH indicator is employed to monitor the dielectric fluid.

An immersion cooling system and methods for operating the system are described. The system can comprise a vessel configured to hold thermally conductive, condensable dielectric fluid; a pressure controller to reduce or increase an interior pressure of the vessel; a computer component configured to be at least partially submerged within the dielectric fluid; and a fluid circulation system configured to draw the dielectric fluid from a sump area of the vessel, pass the dielectric fluid through a filter and deliver the dielectric fluid to a bath area of the vessel.

A two-phase immersion cooling apparatus may include an immersion tank with a primary condenser in thermal communication with an interior volume of the immersion tank and a vapor management system fluidically connected to the immersion tank. The vapor management system may enable the apparatus to effectively manage periods of high vapor production by removing vapor and other gases from a headspace of the immersion tank, condensing the vapor to liquid, and returning the liquid to the immersion tank.