Abstract: A cooling system, for cooling a plurality of server boards, includes at least one main two-phase fluid circuit, with a descending pipe, an ascending pipe, a loop bottom connector and an upper portion thermally coupled with at least one heat rendering exchanger. The cooling system also includes at least one evaporator coupled to a hot source to be cooled down in the server boards, a plurality of local circuits respectively serving one of the server boards and operating in bypass with respect to the main circuit. Each local circuit includes, on the one hand, a first branch, forming a feed-in on the descending pipe and, on the other hand, a second branch forming a fluid return in the ascending pipe of the main circuit, as well as an auxiliary circuit internal to the server board connected to one or several evaporator(s).

Abstract: A capillary evaporator for a heat transfer system includes a member for picking up heat energy comprising a base (10) and a plurality of projections, each of which extends from the base to a peak (12) and the size of which decreases with increasing distance from the base, and a primary wick (2) made of a porous first material with a front face adjacent to the peak of the projections. The flanks of the projections delimit, with the primary wick, empty spaces that form steam ducts. The flanks of the projections are covered with a thin layer (3) of porous material with the thickest part disposed in contact with the primary wick in the vicinity of the peak of each projection, and the thickness of the thin layer decreases with increasing distance from the primary wick.

Abstract: A capillary evaporator for a heat transfer system includes a member for picking up heat energy comprising a base (10) and a plurality of projections, each of which extends from the base to a peak (12) and the size of which decreases with increasing distance from the base, and a primary wick (2) made of a porous first material with a front face adjacent to the peak of the projections. The flanks of the projections delimit, with the primary wick, empty spaces that form steam ducts. The flanks of the projections are covered with a thin layer (3) of porous material with the thickest part disposed in contact with the primary wick in the vicinity of the peak of each projection, and the thickness of the thin layer decreases with increasing distance from the primary wick.

Abstract: A cooling system, for cooling a plurality of server boards, includes at least one main two-phase fluid circuit, with a descending pipe, an ascending pipe, a loop bottom connector and an upper portion thermally coupled with at least one heat rendering exchanger. The cooling system also includes at least one evaporator coupled to a hot source to be cooled down in the server boards, a plurality of local circuits respectively serving one of the server boards and operating in bypass with respect to the main circuit. Each local circuit includes, on the one hand, a first branch, forming a feed-in on the descending pipe and, on the other hand, a second branch forming a fluid return in the ascending pipe of the main circuit, as well as an auxiliary circuit internal to the server board connected to one or several evaporator(s).

Abstract: A capillary evaporator for a heat transfer system includes a member for picking up heat energy comprising a base (10) and a plurality of projections, each of which extends from the base to a peak (12) and the size of which decreases with increasing distance from the base, and a primary wick (2) made of a porous first material with a front face adjacent to the peak of the projections. The flanks of the projections delimit, with the primary wick, empty spaces that form steam ducts. The flanks of the projections are covered with a thin layer (3) of porous material with the thickest part disposed in contact with the primary wick in the vicinity of the peak of each projection, and the thickness of the thin layer decreases with increasing distance from the primary wick.

Abstract: An electronic and/or computer device of the computer server type includes: circuit boards and a power supply unit which provides electrical power to various elements of the electronic device. The power supply unit has a fluidtight enclosure, filled with dielectric fluid capable of collecting heat from various components of the power supply unit in order to release it to a heat exchange wall, and is removable. The device includes a two-phase heat transfer circuit with capillary pumped loop having an evaporator thermally coupled to the heat exchange wall of the power supply unit, and a condenser located at a distance from the power supply unit and thermally coupled to a general thermal collector, such that, when in the working position, the heat exchange zone is pressed against the evaporator.

Abstract: A heat transfer system includes a main circuit forming a fluid loop, the main circuit being devoid of mechanical or capillary pumping means, at least one evaporator unit arranged in bypass to the main circuit, and at least one cooling heat exchanger that includes a portion of the loop main circuit and a heat exchanger coupled to a heat sink, for dissipating thermal energy. The evaporator unit includes an inlet pipe collecting liquid fluid from the main loop, an evaporator including a porous member with capillary pumping coupled to a heat source to be cooled, and an outlet pipe having an ejection nozzle with injects the fluid in primarily vapor phase into the main circuit at least in the loop direction of flow.

Abstract: A device for supporting and connecting electronic circuit cards, including a metal electronic circuit card guide which has grooves, one for each electronic circuit card, each groove being configured to guide an electronic circuit card in a direction of insertion towards a connector associated with it, solid walls for linking the grooves, slots which pass through at least one wall of the electronic circuit card guide, are separated by fins and grouped to form at least one heat exchange area and are arranged and designed so as to distribute the first air flow received from below the electronic circuit card guide in at least a second air flow above the electronic circuit card guide and in contact with the electronic circuit cards.

Abstract: A heat transport device with a diphasic working fluid contained in a general closed circuit, includes an evaporator having a microporous body suitable for providing capillary pumping of liquid phase fluid; a condenser; a tank having an inner space, with a liquid portion and a gas portion; and an inlet/outlet arranged at the liquid portion, wherein the volume of the liquid portion can vary between a minimum volume and a maximum volume. The gas portion of the tank contains the vapor phase of the working fluid, at a first partial pressure, and a noncondensable auxiliary gas at a second partial pressure, wherein the second partial pressure is greater than the first partial pressure, at least when the liquid portion is at the minimum volume thereof.

Abstract: A two-phase heat transfer device that is capillary-driven or gravity-driven, has a two-phase working fluid contained in a closed general circuit, including an evaporator, a condenser, a reservoir having an inner volume with a liquid portion and a gas portion, a first vapor communication circuit, and a second liquid phase communication circuit. The reservoir comprises a plurality of floating bodies separating the liquid portion from the gas portion, by means of which the heat exchanges between the liquid portion and the gas portion are slowed down, which allows to diminish the effect of movement of the liquid portion or of an influx of cold or warm liquid into the reservoir.

Abstract: A device for supporting and connecting electronic circuit cards, including a metal electronic circuit card guide which has grooves, one for each electronic circuit card, each groove being configured to guide an electronic circuit card in a direction of insertion towards a connector associated with it, solid walls for linking the grooves, slots which pass through at least one wall of the electronic circuit card guide, are separated by fins and grouped to form at least one heat exchange area and are arranged and designed so as to distribute the first air flow received from below the electronic circuit card guide in at least a second air flow above the electronic circuit card guide and in contact with the electronic circuit cards.

Abstract: An electronic and/or computer device of the computer server type includes: circuit boards and a power supply unit which provides electrical power to various elements of the electronic device. The power supply unit has a fluidtight enclosure, filled with dielectric fluid capable of collecting heat from various components of the power supply unit in order to release it to a heat exchange wall, and is removable. The device includes a two-phase heat transfer circuit with capillary pumped loop having an evaporator thermally coupled to the heat exchange wall of the power supply unit, and a condenser located at a distance from the power supply unit and thermally coupled to a general thermal collector, such that, when in the working position, the heat exchange zone is pressed against the evaporator.

Abstract: A capillary-driven heat transfer device, adapted to extract heat from a heat source and to release this heat to a cold source by means of a two-phase working fluid, includes an evaporator, having a microporous mass adapted to perform capillary pumping of fluid in the liquid phase, a condenser, a reservoir having an inlet and/or outlet port, a vapor communication circuit, connecting the outlet of the evaporator to the inlet of the condenser, and a liquid communication circuit connecting the outlet of the condenser to the reservoir and to the inlet of the evaporator. The reservoir includes multiple separate volumes that remain in fluid communication.

Abstract: A heat transfer system includes a main circuit forming a fluid loop, the main circuit being devoid of mechanical or capillary pumping means, at least one evaporator unit arranged in bypass to the main circuit, and at least one cooling heat exchanger that includes a portion of the loop main circuit and a heat exchanger coupled to a heat sink, for dissipating thermal energy. The evaporator unit includes an inlet pipe collecting liquid fluid from the main loop, an evaporator including a porous member with capillary pumping coupled to a heat source to be cooled, and an outlet pipe having an ejection nozzle with injects the fluid in primarily vapor phase into the main circuit at least in the loop direction of flow.

Abstract: A capillary-driven heat transfer device is adapted to extract heat from a heat source and release this heat to a cold source using a two-phase working fluid. The device includes an evaporator having a microporous mass performing capillary pumping of fluid in the liquid phase, a condenser, a reservoir having an inner chamber and an inlet and/or outlet port, a vapor communication circuit, connecting the outlet of the evaporator to the inlet of the condenser, a liquid communication circuit, and a non-return device arranged between the inner chamber of the reservoir and the microporous mass of the evaporator, and arranged to prevent liquid present in the evaporator from moving to the inner chamber of the reservoir.

Abstract: A two-phase heat transfer device that is capillary-driven or gravity-driven, has a two-phase working fluid contained in a closed general circuit, including an evaporator, a condenser, a reservoir having an inner volume with a liquid portion and a gas portion, a first vapor communication circuit, and a second liquid phase communication circuit. The reservoir comprises a plurality of floating bodies separating the liquid portion from the gas portion, by means of which the heat exchanges between the liquid portion and the gas portion are slowed down, which allows to diminish the effect of movement of the liquid portion or of an influx of cold or warm liquid into the reservoir.

Abstract: A heat transport device with a diphasic working fluid contained in a general closed circuit, includes an evaporator having a microporous body suitable for providing capillary pumping of liquid phase fluid; a condenser; a tank having an inner space, with a liquid portion and a gas portion; and an inlet/outlet arranged at the liquid portion, wherein the volume of the liquid portion can vary between a minimum volume and a maximum volume. The gas portion of the tank contains the vapor phase of the working fluid, at a first partial pressure, and a noncondensable auxiliary gas at a second partial pressure, wherein the second partial pressure is greater than the first partial pressure, at least when the liquid portion is at the minimum volume thereo.

Abstract: A capillary-driven heat transfer device is adapted to extract heat from a heat source and release this heat to a cold source using a two-phase working fluid. The device includes an evaporator having a microporous mass performing capillary pumping of fluid in the liquid phase, a condenser, a reservoir having an inner chamber and an inlet and/or outlet port, a vapor communication circuit, connecting the outlet of the evaporator to the inlet of the condenser, a liquid communication circuit, and a non-return device arranged between the inner chamber of the reservoir and the microporous mass of the evaporator, and arranged to prevent liquid present in the evaporator from moving to the inner chamber of the reservoir.

Abstract: A capillary-driven heat transfer device, adapted to extract heat from a heat source and to release this heat to a cold source by means of a two-phase working fluid, includes an evaporator, having a microporous mass adapted to perform capillary pumping of fluid in the liquid phase, a condenser, a reservoir having an inlet and/or outlet port, a vapor communication circuit connecting the outlet of the evaporator to the inlet of the condenser, and a liquid communication circuit connecting the outlet of the condenser to the reservoir and to the inlet of the evaporator. The reservoir includes multiple separate volumes that remain in fluid communication.

Abstract: A heat transfer assembly for transferring heat from a heat generating device to a circulating fluid, said heat transfer assembly comprising an evaporator device having at least one microchannel formed therein, in thermally conductive contact with said heat generating device, a condenser device, actuating means and manifold means for circulating said fluid between said evaporator device and said condenser device, wherein said heat transfer assembly further comprises a bubble generator capable to create bubbles in said at least one microchannel at a controlled frequency.