US20030056940A1 - Transpiration cooled heat sink and a self contained coolant supply for same - Google Patents
Transpiration cooled heat sink and a self contained coolant supply for same Download PDFInfo
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- US20030056940A1 US20030056940A1 US09/965,037 US96503701A US2003056940A1 US 20030056940 A1 US20030056940 A1 US 20030056940A1 US 96503701 A US96503701 A US 96503701A US 2003056940 A1 US2003056940 A1 US 2003056940A1
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- Prior art keywords
- coolant
- heat sink
- cooled heat
- transpiration cooled
- distribution
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/003—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by using permeable mass, perforated or porous materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/427—Cooling by change of state, e.g. use of heat pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
- F28D2021/0029—Heat sinks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0077—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for tempering, e.g. with cooling or heating circuits for temperature control of elements
- F28D2021/0078—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for tempering, e.g. with cooling or heating circuits for temperature control of elements in the form of cooling walls
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates generally to a heat sink and more particularly to a transpiration cooled heat sink and a self contained coolant supply for the transpiration cooled heat sink.
- the signal flow within the component generates heat which if not removed may cause damage. If this heat is not removed, or dissipated, the electronic component may not operate correctly and may become damaged.
- the heat generated by the electronic component is dissipated by a cooling means, such as a heat sink which absorbs and dissipates the heat via direct air convection.
- Heat sinks are well known in the electronics industry and are used extensively to dissipate heat generated by electronic components used in computers and various other electronic equipment.
- a transpiration cooled heat sink comprising: a heat sink base structure, the heat sink base structure having a coolant inlet for receiving a coolant and a coolant outlet for distributing a coolant, wherein the heat sink base structure defines at least one coolant channel disposed so as to be communicated with the coolant inlet and the coolant outlet; and a coolant distribution structure, wherein the coolant distribution structure defines at least one distribution cavity and includes at least one distribution inlet communicated with the distribution cavity and wherein the coolant distribution structure is disposed relative to the heat sink base structure such that the distribution inlet is communicated with the coolant outlet.
- a self contained coolant supply for a transpiration cooled heat sink comprising: a coolant production apparatus, the coolant production apparatus having an airflow inlet for receiving an airflow, an airflow outlet for discharging the airflow, a dehumidification unit for extracting a coolant from the airflow and a product outlet for discharging the coolant; and a coolant storage structure, wherein the coolant storage structure defines a storage cavity for containing the coolant and includes a storage inlet and a storage outlet, wherein the storage inlet is communicated with the storage cavity and the product outlet and wherein the storage outlet is communicated with the storage cavity and a transpiration cooled heat sink.
- a method for using a transpiration cooled heat sink and a self contained coolant supply for a transpiration cooled heat sink comprising: obtaining a transpiration cooled heat sink having a coolant inlet, a self contained coolant supply for a transpiration cooled heat sink having a dehumidification unit, a coolant storage structure and a storage outlet and an electronic system which includes at least one electronic device having a device outer surface; positioning the self contained coolant supply within the electronic system so as to receive an airflow; attaching the transpiration cooled heat sink to the electronic device so as to communicate the transpiration cooled heat sink with the device outer surface; communicating the coolant inlet with the storage outlet; and operating the self contained coolant supply so as to produce a coolant.
- FIG. 1 is a side cross sectional view of a transpiration cooled heat sink in accordance with an embodiment of the invention
- FIG. 2 is a top down cross sectional view of a transpiration cooled heat sink showing the heat sink base structure and the coolant channel in a square pattern in accordance with an embodiment of the invention
- FIG. 3 is a top down cross sectional view of a transpiration cooled heat sink showing heat sink base structure and the coolant channel in a serpentine or “S” shaped pattern in accordance with an embodiment of the invention
- FIG. 4 is a top down cross sectional view showing an alternative embodiment of a transpiration cooled heat sink in accordance with an embodiment of the invention
- FIG. 5 is a side cross sectional view of an alternative embodiment of a transpiration cooled heat sink in accordance with an embodiment of the invention.
- FIG. 6 is a functional diagram illustrating a self contained coolant supply communicated with a transpiration cooled heat sink in accordance with an embodiment of the invention
- FIG. 7 is a functional diagram illustrating a self contained coolant supply employing a coolant pump communicated with a transpiration cooled heat sink in accordance with an embodiment of the invention.
- FIG. 8 is a flow chart of a method for using a transpiration cooled heat sink and a self contained coolant supply in accordance with an embodiment of the invention.
- FIG. 1 illustrates a transpiration cooled heat sink 1 in accordance with an embodiment of the invention and preferably includes a heat sink base structure 2 and a coolant distribution structure 4 .
- the heat sink base structure 2 preferably includes a coolant inlet 6 , a coolant outlet 8 and a coolant channel 10 communicated with coolant inlet 6 and coolant outlet 8 .
- the coolant distribution structure 4 preferably defines a distribution cavity 12 and includes a distribution inlet 14 communicated with distribution cavity 12 and at least one distribution member 16 , and preferably a plurality of distribution members 16 , wherein distribution member 16 is constructed such that distribution cavity 12 is disposed within the distribution member 16 .
- heat sink base structure 2 is preferably non-movably associated with coolant distribution structure 4 and disposed relative to coolant distribution structure 4 such that distribution inlet 14 is communicated with coolant outlet 8 .
- coolant channel 10 may be of any shape that is suitable to the desired end purpose. Examples of this can be seen in FIG. 2 and FIG. 3. Referring to FIG. 2, a heat sink base structure 2 is shown having a coolant channel 10 forming a square pattern within heat sink base structure 2 . Referring to FIG. 3, a heat sink base structure 2 is shown having a coolant channel 10 forming a serpentine or “S” shaped pattern within heat sink base structure 2 .
- heat sink base structure 2 and coolant distribution structure 4 are preferably non-movably associated with each other and may be connected together via any attaching device (e.g. screws, bolts, clips) or any attaching method (e.g. soldering, brazing) known in the art and suitable to the desired end purpose.
- any attaching device e.g. screws, bolts, clips
- any attaching method e.g. soldering, brazing
- heat sink base structure 2 is preferably constructed from any solid material known in the art and suitable to the desired end purpose having sufficient rigidity and thermal characteristics, such as copper or aluminum.
- coolant distribution structure 4 and/or distribution member 16 are preferably constructed from any porous material known in the art and suitable to the desired end purpose, such as copper or aluminum.
- coolant distribution structure 4 and/or distribution member 16 may be formed by sintered powder metallurgy or foam metal technologies.
- FIG. 4 and FIG. 5 an alternative embodiment of a transpiration cooled heat sink 1 is illustrated in accordance with an embodiment of the invention and preferably includes a heat sink base structure 2 and a coolant distribution structure 4 .
- the heat sink base structure 2 preferably includes a coolant inlet 6 , a coolant outlet 8 and a coolant channel 10 communicated with coolant inlet 6 and coolant outlet 8 .
- the coolant distribution structure 4 preferably defines a distribution cavity 12 and includes a distribution inlet 14 communicated with distribution cavity 12 and coolant outlet 8 .
- Coolant distribution structure 4 also preferably includes a distribution outlet 15 disposed so as to be communicated with distribution cavity 12 .
- heat sink base structure 2 further includes a module attachment structure 18 having a plurality of module channels 24 disposed so as to be communicated with distribution outlet 15 .
- Module attachment structure 18 also preferably includes a heat transfer surface 20 which is preferably non-movably attached to module attachment structure 18 and disposed so as to be communicated with plurality of module channels 24 .
- Coolant distribution structure 4 also includes a coolant distribution device 22 disposed within module channels 24 so as to be communicated with distribution outlet 15 and heat transfer surface 20 . This allows distribution cavity 12 to be communicated with coolant distribution device 22 via distribution outlet 15 for coolant distribution.
- heat transfer surface 20 is preferably constructed from a porous metal surface, such as copper or aluminum.
- heat transfer surface 20 may be formed by sintered powder metallurgy or foam metal technologies.
- coolant distribution device 22 is preferably constructed from a wicking material having suitable absorption properties, such as cotton string.
- module attachment structure 18 and heat transfer surface 20 are preferably non-movably associated with each other and may be connected together via any attaching device (e.g. screws, bolts, clips) or any attaching method (e.g. soldering, brazing) known in the art and suitable to the desired end purpose.
- any attaching device e.g. screws, bolts, clips
- any attaching method e.g. soldering, brazing
- coolant production apparatus 102 includes an airflow inlet 106 for receiving an airflow 105 , an airflow outlet 108 for discharging airflow 105 , a dehumidification unit 110 for extracting a coolant 111 from airflow 105 and a product outlet 112 communicated with dehumidification unit 110 for discharging a coolant 111 .
- airflow 105 to airflow inlet 106 may be provided by an external source drawing in outside air, such as a fan, or may be self contained. If airflow 105 to airflow inlet 106 is a self contained airflow 105 , the moist air evaporated from transpiration cooled heat sink 1 is circulated into airflow inlet 106 and dehumidified allowing coolant 111 to be recycled and reused.
- Dehumidification unit 110 preferably includes a control device 109 for controlling the on/off power supplied to dehumidification unit 110 .
- control device 109 is preferably connected to an external power source, but it is considered within the scope of the invention that control device 109 may contain an internal power source.
- dehumidification unit 110 is preferably disposed within coolant production apparatus 102 so as to be communicated with airflow inlet 106 so as to receive airflow 105 .
- Coolant storage structure 104 preferably defines a storage cavity 114 and includes a storage outlet 118 and a storage inlet 116 communicated with product outlet 112 , wherein storage inlet 116 and storage outlet 118 are disposed so as to be communicated with storage cavity 114 .
- a coolant level measuring device may be provided for measuring the level of coolant within storage cavity 114 . In accordance with an embodiment of the invention, any coolant level measuring device known within the art and suitable to the desired end purpose may be used.
- self contained coolant supply for a transpiration cooled heat sink 100 is preferably disposed so that storage outlet 118 is preferably communicated with coolant inlet 6 of a transpiration cooled heat sink 1 , wherein a coolant contained within storage cavity 114 is communicated with coolant inlet 6 via a gravity feed process.
- a coolant pump 120 may be used to communicate a coolant from storage cavity 114 to coolant inlet 6 .
- coolant pump 120 is preferably a centrifugal pump.
- coolant pump 120 may be any pumping device known in the art and suitable to the desired end purpose.
- product outlet 112 is preferably communicated with storage inlet 116 via any communication device known in the art and suitable to the desired end purpose, such as copper tubing or rubber tubing.
- storage outlet 118 is preferably communicated with coolant inlet 6 via any communication device known in the art and suitable to the desired end purpose, such as copper tubing or rubber tubing.
- a method for using a transpiration cooled heat sink 1 and a self contained coolant supply for a transpiration cooled heat sink 100 is illustrated in accordance with an embodiment of the invention.
- a transpiration cooled heat sink 1 having a coolant inlet 6 a self contained coolant supply for a transpiration cooled heat sink 100 having a storage outlet 118 and an electronic system 122 which includes at least one electronic device 124 having a device outer surface 126 is obtained.
- Self contained coolant supply 100 is then positioned within electronic system 122 so as to receive an airflow 105 , as in step 202 .
- self contained coolant supply 100 is disposed within electronic system 122 so as to communicate airflow 105 with airflow inlet 106 .
- Transpiration cooled heat sink 1 is then attached to electronic device 126 so as to be communicated with device outer surface 126 , as in step 204 .
- Self contained coolant supply 100 is then communicated with transpiration cooled heat sink 1 as in step 206 by communicating storage outlet 118 with coolant inlet 6 .
- Electronic system 122 is then operated so as to cause electronic device 124 to heat up.
- Self contained coolant supply 100 is then operated, as in step 208 , so as to cause dehumidification unit 110 to begin extracting coolant 111 from airflow 105 and storing coolant 111 into storage cavity 114 .
- coolant 111 may be introduced into storage cavity 114 manually via an external source, or by dehumidification unit 110 which may be operated prior to the operation of electronic system 122 so as to allow for the generation and storage of coolant 111 .
- dehumidification unit 110 may be operated prior to the operation of electronic system 122 so as to allow for the generation and storage of coolant 111 .
- This may be necessary upon initial use of self contained coolant supply for a transpiration cooled heat sink 100 because dehumidification unit 110 has not been operated so as to generate coolant 111 and thus storage cavity 114 does not contain a sufficient amount of coolant 111 to safely operate electronic device 124 .
- coolant 111 is preferably water.
- coolant 111 may be any coolant known in the art and suitable to the desired end purpose.
- transpiration cooled heat sink 1 is preferably attached to electronic device 124 using any known attaching device known in the art and suitable to the desired end purpose, such as a clip.
- coolant 111 will be stored within storage cavity 114 . Coolant 111 will then flow through storage outlet 118 into coolant inlet 6 via gravity feed. However, if desired a coolant pump 120 may be used to aid or create coolant flow from storage outlet 118 into coolant inlet 6 . As coolant 111 flows through coolant inlet 6 , coolant 111 flows into coolant channel 10 and out of coolant outlet 8 into distribution cavity 12 .
- the heat generated by electronic device 124 flows through device outer surface 126 into transpiration cooled heat sink 1 causing coolant 111 contained within distribution cavity 12 to permeate the porous metal structure of distribution member 16 to its outer surface where it can evaporate into the unsaturated air flowing over the outer surface of distribution member 16 .
- Evaporated coolant 111 is then replaced via gravity feed or via a coolant pump 120 , as discussed hereinabove.
- transpiration cooling occurs when the unsaturated airflow 105 flows over the coolant 111 that is disposed on the outer surface of distribution member 16 .
- the coolant 111 readily evaporates into the unsaturated airflow 105 whereby both mass, in this case coolant 111 in the form of vapor, and heat are transferred to the airflow 105 .
- This heat termed latent heat, is transferred by virtue of the change in coolant phase, i.e. coolant 111 changing from a liquid to a vapor.
- Sensible heat is also transferred by virtue of the temperature difference between outer surface of distribution member 16 and airflow 105 , wherein the outer surface of distribution member 16 is higher in temperature than airflow 105 .
- FIG. 4 Referring to FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8, an alternative embodiment of a transpiration cooled heat sink 1 is discussed.
- dehumidification unit 110 begins to extract a coolant 111 from airflow 105
- coolant 111 will be stored within storage cavity 114 .
- Coolant 111 will then flow through storage outlet 118 into coolant inlet 6 via gravity feed.
- a coolant pump 120 may be used to aid or create coolant flow from storage outlet 118 into coolant inlet 6 .
- coolant 111 flows into coolant channel 10 and out of coolant outlet 8 into distribution cavity 12 .
- Coolant 111 then contacts coolant distribution device 22 disposed within module channels 24 and is absorbed via capillary action into coolant distribution device 22 . Coolant is then distributed over the heat transfer surface 20 by coolant distribution device 22 . As electronic device 124 operates, the heat generated by electronic device 124 flows through device outer surface 126 into module attachment structure 18 and into heat transfer surface 20 causing coolant 111 disposed on heat transfer surface 20 to evaporate into the unsaturated air flowing over the outer surface of transpiration cooled heat sink 1 . Evaporated coolant 111 is then replaced via gravity feed or via a coolant pump 120 .
- multiple transpiration cooled heat sinks 1 may be cooled simultaneously by a single or multiple self contained coolant supplies 100 . This may be done by communicating multiple coolant inlets 6 with storage outlet 118 .
Abstract
A transpiration cooled heat sink, a self contained coolant supply and a method of using a transpiration cooled heat sink and a self contained coolant supply is provided and includes a heat sink base structure, the heat sink base structure having a coolant inlet for receiving a coolant and a coolant outlet for distributing a coolant, wherein the heat sink base structure defines at least one coolant channel disposed so as to be communicated with the coolant inlet and the coolant outlet and a coolant distribution structure, wherein the coolant distribution structure defines at least one distribution cavity and includes at least one distribution inlet communicated with the distribution cavity and wherein the coolant distribution structure is disposed relative to the heat sink base structure such that the distribution inlet is communicated with the coolant outlet.
Description
- The present invention relates generally to a heat sink and more particularly to a transpiration cooled heat sink and a self contained coolant supply for the transpiration cooled heat sink.
- As an electronic component operates, the signal flow within the component generates heat which if not removed may cause damage. If this heat is not removed, or dissipated, the electronic component may not operate correctly and may become damaged. Typically, the heat generated by the electronic component is dissipated by a cooling means, such as a heat sink which absorbs and dissipates the heat via direct air convection. Heat sinks are well known in the electronics industry and are used extensively to dissipate heat generated by electronic components used in computers and various other electronic equipment.
- However, improvements in integrated circuit (IC) design and fabrication techniques are allowing IC manufacturers to produce smaller IC devices and other electronic components which operate at increasingly faster speeds and which perform an increasingly higher number of operations. As the operating speed and operational parameters of an electronic component increases, so to does the heat generated by these components. As a result, heat sinks that use conventional direct air cooling technology, or direct air convection, to dissipate heat are fast approaching the limits of their cooling abilities and it is becoming increasingly difficult to dissipate this increased heat. This is true even for electronic components that were once considered to be a low power technology and as such low heat generators, such as complementary metal oxide semiconductor, or CMOS, circuitry.
- Therefore, it would be desirable to provide a cooling means that is capable of dissipating heat generated by various types of current and future generations of electronic components.
- A transpiration cooled heat sink comprising: a heat sink base structure, the heat sink base structure having a coolant inlet for receiving a coolant and a coolant outlet for distributing a coolant, wherein the heat sink base structure defines at least one coolant channel disposed so as to be communicated with the coolant inlet and the coolant outlet; and a coolant distribution structure, wherein the coolant distribution structure defines at least one distribution cavity and includes at least one distribution inlet communicated with the distribution cavity and wherein the coolant distribution structure is disposed relative to the heat sink base structure such that the distribution inlet is communicated with the coolant outlet.
- A self contained coolant supply for a transpiration cooled heat sink comprising: a coolant production apparatus, the coolant production apparatus having an airflow inlet for receiving an airflow, an airflow outlet for discharging the airflow, a dehumidification unit for extracting a coolant from the airflow and a product outlet for discharging the coolant; and a coolant storage structure, wherein the coolant storage structure defines a storage cavity for containing the coolant and includes a storage inlet and a storage outlet, wherein the storage inlet is communicated with the storage cavity and the product outlet and wherein the storage outlet is communicated with the storage cavity and a transpiration cooled heat sink.
- A method for using a transpiration cooled heat sink and a self contained coolant supply for a transpiration cooled heat sink comprising: obtaining a transpiration cooled heat sink having a coolant inlet, a self contained coolant supply for a transpiration cooled heat sink having a dehumidification unit, a coolant storage structure and a storage outlet and an electronic system which includes at least one electronic device having a device outer surface; positioning the self contained coolant supply within the electronic system so as to receive an airflow; attaching the transpiration cooled heat sink to the electronic device so as to communicate the transpiration cooled heat sink with the device outer surface; communicating the coolant inlet with the storage outlet; and operating the self contained coolant supply so as to produce a coolant.
- FIG. 1 is a side cross sectional view of a transpiration cooled heat sink in accordance with an embodiment of the invention;
- FIG. 2 is a top down cross sectional view of a transpiration cooled heat sink showing the heat sink base structure and the coolant channel in a square pattern in accordance with an embodiment of the invention;
- FIG. 3 is a top down cross sectional view of a transpiration cooled heat sink showing heat sink base structure and the coolant channel in a serpentine or “S” shaped pattern in accordance with an embodiment of the invention;
- FIG. 4 is a top down cross sectional view showing an alternative embodiment of a transpiration cooled heat sink in accordance with an embodiment of the invention;
- FIG. 5 is a side cross sectional view of an alternative embodiment of a transpiration cooled heat sink in accordance with an embodiment of the invention;
- FIG. 6 is a functional diagram illustrating a self contained coolant supply communicated with a transpiration cooled heat sink in accordance with an embodiment of the invention;
- FIG. 7 is a functional diagram illustrating a self contained coolant supply employing a coolant pump communicated with a transpiration cooled heat sink in accordance with an embodiment of the invention; and
- FIG. 8 is a flow chart of a method for using a transpiration cooled heat sink and a self contained coolant supply in accordance with an embodiment of the invention.
- Referring to the drawings, FIG. 1 illustrates a transpiration cooled
heat sink 1 in accordance with an embodiment of the invention and preferably includes a heatsink base structure 2 and a coolant distribution structure 4. The heatsink base structure 2 preferably includes acoolant inlet 6, acoolant outlet 8 and acoolant channel 10 communicated withcoolant inlet 6 andcoolant outlet 8. The coolant distribution structure 4 preferably defines adistribution cavity 12 and includes adistribution inlet 14 communicated withdistribution cavity 12 and at least onedistribution member 16, and preferably a plurality ofdistribution members 16, whereindistribution member 16 is constructed such thatdistribution cavity 12 is disposed within thedistribution member 16. - In accordance with an embodiment of the invention, heat
sink base structure 2 is preferably non-movably associated with coolant distribution structure 4 and disposed relative to coolant distribution structure 4 such thatdistribution inlet 14 is communicated withcoolant outlet 8. In accordance with an embodiment of the invention,coolant channel 10 may be of any shape that is suitable to the desired end purpose. Examples of this can be seen in FIG. 2 and FIG. 3. Referring to FIG. 2, a heatsink base structure 2 is shown having acoolant channel 10 forming a square pattern within heatsink base structure 2. Referring to FIG. 3, a heatsink base structure 2 is shown having acoolant channel 10 forming a serpentine or “S” shaped pattern within heatsink base structure 2. - In accordance with an embodiment of the invention, heat
sink base structure 2 and coolant distribution structure 4 are preferably non-movably associated with each other and may be connected together via any attaching device (e.g. screws, bolts, clips) or any attaching method (e.g. soldering, brazing) known in the art and suitable to the desired end purpose. - In accordance with an embodiment of the invention, heat
sink base structure 2 is preferably constructed from any solid material known in the art and suitable to the desired end purpose having sufficient rigidity and thermal characteristics, such as copper or aluminum. - In accordance with an embodiment of the invention, coolant distribution structure4 and/or
distribution member 16 are preferably constructed from any porous material known in the art and suitable to the desired end purpose, such as copper or aluminum. In addition, coolant distribution structure 4 and/ordistribution member 16 may be formed by sintered powder metallurgy or foam metal technologies. - Referring to FIG. 4 and FIG. 5, an alternative embodiment of a transpiration cooled
heat sink 1 is illustrated in accordance with an embodiment of the invention and preferably includes a heatsink base structure 2 and a coolant distribution structure 4. The heatsink base structure 2 preferably includes acoolant inlet 6, acoolant outlet 8 and acoolant channel 10 communicated withcoolant inlet 6 andcoolant outlet 8. The coolant distribution structure 4 preferably defines adistribution cavity 12 and includes adistribution inlet 14 communicated withdistribution cavity 12 andcoolant outlet 8. Coolant distribution structure 4 also preferably includes adistribution outlet 15 disposed so as to be communicated withdistribution cavity 12. In addition, heatsink base structure 2 further includes amodule attachment structure 18 having a plurality ofmodule channels 24 disposed so as to be communicated withdistribution outlet 15.Module attachment structure 18 also preferably includes aheat transfer surface 20 which is preferably non-movably attached tomodule attachment structure 18 and disposed so as to be communicated with plurality ofmodule channels 24. Coolant distribution structure 4 also includes acoolant distribution device 22 disposed withinmodule channels 24 so as to be communicated withdistribution outlet 15 andheat transfer surface 20. This allowsdistribution cavity 12 to be communicated withcoolant distribution device 22 viadistribution outlet 15 for coolant distribution. - In accordance with an embodiment of the invention,
heat transfer surface 20 is preferably constructed from a porous metal surface, such as copper or aluminum. In addition,heat transfer surface 20 may be formed by sintered powder metallurgy or foam metal technologies. - In accordance with an embodiment of the invention,
coolant distribution device 22 is preferably constructed from a wicking material having suitable absorption properties, such as cotton string. - In accordance with an embodiment of the invention,
module attachment structure 18 andheat transfer surface 20 are preferably non-movably associated with each other and may be connected together via any attaching device (e.g. screws, bolts, clips) or any attaching method (e.g. soldering, brazing) known in the art and suitable to the desired end purpose. - Referring to FIG. 6 and FIG. 7, a self contained coolant supply for a transpiration cooled
heat sink 100 is illustrated and preferably includes acoolant production apparatus 102 and acoolant storage structure 104. In accordance with an embodiment of the invention,coolant production apparatus 102 includes anairflow inlet 106 for receiving anairflow 105, anairflow outlet 108 fordischarging airflow 105, adehumidification unit 110 for extracting acoolant 111 fromairflow 105 and aproduct outlet 112 communicated withdehumidification unit 110 for discharging acoolant 111. It is considered within the scope of the invention, thatairflow 105 toairflow inlet 106 may be provided by an external source drawing in outside air, such as a fan, or may be self contained. Ifairflow 105 toairflow inlet 106 is a self containedairflow 105, the moist air evaporated from transpiration cooledheat sink 1 is circulated intoairflow inlet 106 and dehumidified allowingcoolant 111 to be recycled and reused.Dehumidification unit 110 preferably includes acontrol device 109 for controlling the on/off power supplied todehumidification unit 110. In accordance with an embodiment of the invention,control device 109 is preferably connected to an external power source, but it is considered within the scope of the invention thatcontrol device 109 may contain an internal power source. - Moreover,
dehumidification unit 110 is preferably disposed withincoolant production apparatus 102 so as to be communicated withairflow inlet 106 so as to receiveairflow 105.Coolant storage structure 104 preferably defines astorage cavity 114 and includes astorage outlet 118 and astorage inlet 116 communicated withproduct outlet 112, whereinstorage inlet 116 andstorage outlet 118 are disposed so as to be communicated withstorage cavity 114. A coolant level measuring device may be provided for measuring the level of coolant withinstorage cavity 114. In accordance with an embodiment of the invention, any coolant level measuring device known within the art and suitable to the desired end purpose may be used. - In addition, self contained coolant supply for a transpiration cooled
heat sink 100 is preferably disposed so thatstorage outlet 118 is preferably communicated withcoolant inlet 6 of a transpiration cooledheat sink 1, wherein a coolant contained withinstorage cavity 114 is communicated withcoolant inlet 6 via a gravity feed process. However, as shown in FIG. 7, if desired acoolant pump 120 may be used to communicate a coolant fromstorage cavity 114 tocoolant inlet 6. - In accordance with an embodiment of the invention,
coolant pump 120 is preferably a centrifugal pump. However,coolant pump 120 may be any pumping device known in the art and suitable to the desired end purpose. - In accordance with an embodiment of the invention,
product outlet 112 is preferably communicated withstorage inlet 116 via any communication device known in the art and suitable to the desired end purpose, such as copper tubing or rubber tubing. Also, in accordance with an embodiment of the invention,storage outlet 118 is preferably communicated withcoolant inlet 6 via any communication device known in the art and suitable to the desired end purpose, such as copper tubing or rubber tubing. - Referring to the figures, a method for using a transpiration cooled
heat sink 1 and a self contained coolant supply for a transpiration cooledheat sink 100 is illustrated in accordance with an embodiment of the invention. As shown in step 200 a transpiration cooledheat sink 1 having acoolant inlet 6, a self contained coolant supply for a transpiration cooledheat sink 100 having astorage outlet 118 and anelectronic system 122 which includes at least oneelectronic device 124 having a deviceouter surface 126 is obtained. - Self contained
coolant supply 100 is then positioned withinelectronic system 122 so as to receive anairflow 105, as instep 202. In accordance with an embodiment of the invention, self containedcoolant supply 100 is disposed withinelectronic system 122 so as to communicateairflow 105 withairflow inlet 106. Transpiration cooledheat sink 1 is then attached toelectronic device 126 so as to be communicated with deviceouter surface 126, as instep 204. Self containedcoolant supply 100 is then communicated with transpiration cooledheat sink 1 as instep 206 by communicatingstorage outlet 118 withcoolant inlet 6.Electronic system 122 is then operated so as to causeelectronic device 124 to heat up. Self containedcoolant supply 100 is then operated, as instep 208, so as to causedehumidification unit 110 to begin extractingcoolant 111 fromairflow 105 and storingcoolant 111 intostorage cavity 114. - In accordance with an embodiment of the invention, if
storage cavity 114 does not contain an adequate amount ofcoolant 111 to coolelectronic device 124,coolant 111 may be introduced intostorage cavity 114 manually via an external source, or bydehumidification unit 110 which may be operated prior to the operation ofelectronic system 122 so as to allow for the generation and storage ofcoolant 111. This may be necessary upon initial use of self contained coolant supply for a transpiration cooledheat sink 100 becausedehumidification unit 110 has not been operated so as to generatecoolant 111 and thusstorage cavity 114 does not contain a sufficient amount ofcoolant 111 to safely operateelectronic device 124. - In accordance with an embodiment of the invention,
coolant 111 is preferably water. However,coolant 111 may be any coolant known in the art and suitable to the desired end purpose. - In accordance with an embodiment of the invention, transpiration cooled
heat sink 1 is preferably attached toelectronic device 124 using any known attaching device known in the art and suitable to the desired end purpose, such as a clip. - Referring to FIG. 1, FIG. 6, FIG. 7 and FIG. 8, as
dehumidification unit 110 begins to extract acoolant 111 fromairflow 105,coolant 111 will be stored withinstorage cavity 114.Coolant 111 will then flow throughstorage outlet 118 intocoolant inlet 6 via gravity feed. However, if desired acoolant pump 120 may be used to aid or create coolant flow fromstorage outlet 118 intocoolant inlet 6. Ascoolant 111 flows throughcoolant inlet 6,coolant 111 flows intocoolant channel 10 and out ofcoolant outlet 8 intodistribution cavity 12. Aselectronic device 124 operates, the heat generated byelectronic device 124 flows through deviceouter surface 126 into transpiration cooledheat sink 1 causingcoolant 111 contained withindistribution cavity 12 to permeate the porous metal structure ofdistribution member 16 to its outer surface where it can evaporate into the unsaturated air flowing over the outer surface ofdistribution member 16. Evaporatedcoolant 111 is then replaced via gravity feed or via acoolant pump 120, as discussed hereinabove. - In accordance with an embodiment of the invention, transpiration cooling occurs when the
unsaturated airflow 105 flows over thecoolant 111 that is disposed on the outer surface ofdistribution member 16. Under this condition, thecoolant 111 readily evaporates into theunsaturated airflow 105 whereby both mass, in thiscase coolant 111 in the form of vapor, and heat are transferred to theairflow 105. This heat, termed latent heat, is transferred by virtue of the change in coolant phase, i.e.coolant 111 changing from a liquid to a vapor. Sensible heat is also transferred by virtue of the temperature difference between outer surface ofdistribution member 16 andairflow 105, wherein the outer surface ofdistribution member 16 is higher in temperature thanairflow 105. Since the transfer for latent heat does not result in an increase in temperature, the thermal performance of transpiration cooledheat sink 1 is significantly increased over conventionally cooled heat sinks. As thecoolant 111 which is disposed on the outer surface ofdistribution member 16 evaporates,coolant 111 is replenished by a combination of capillary action withindistribution member 16 and by the pressure oncoolant 111 withindistribution member 16 due to gravity and/orcoolant pump 120. - Referring to FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8, an alternative embodiment of a transpiration cooled
heat sink 1 is discussed. Asdehumidification unit 110 begins to extract acoolant 111 fromairflow 105,coolant 111 will be stored withinstorage cavity 114.Coolant 111 will then flow throughstorage outlet 118 intocoolant inlet 6 via gravity feed. However, if desired acoolant pump 120 may be used to aid or create coolant flow fromstorage outlet 118 intocoolant inlet 6. Ascoolant 111 flows throughcoolant inlet 6,coolant 111 flows intocoolant channel 10 and out ofcoolant outlet 8 intodistribution cavity 12.Coolant 111 then contactscoolant distribution device 22 disposed withinmodule channels 24 and is absorbed via capillary action intocoolant distribution device 22. Coolant is then distributed over theheat transfer surface 20 bycoolant distribution device 22. Aselectronic device 124 operates, the heat generated byelectronic device 124 flows through deviceouter surface 126 intomodule attachment structure 18 and intoheat transfer surface 20 causingcoolant 111 disposed onheat transfer surface 20 to evaporate into the unsaturated air flowing over the outer surface of transpiration cooledheat sink 1. Evaporatedcoolant 111 is then replaced via gravity feed or via acoolant pump 120. - It is considered within the scope of the invention, that multiple transpiration cooled
heat sinks 1 may be cooled simultaneously by a single or multiple self contained coolant supplies 100. This may be done by communicatingmultiple coolant inlets 6 withstorage outlet 118. - While the invention has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (23)
1. A transpiration cooled heat sink comprising:
a heat sink base structure, said heat sink base structure having a coolant inlet for receiving a coolant and a coolant outlet for distributing a coolant, wherein said heat sink base structure defines at least one coolant channel disposed so as to be communicated with said coolant inlet and said coolant outlet; and
a coolant distribution structure, wherein said coolant distribution structure defines at least one distribution cavity and includes at least one distribution inlet communicated with said distribution cavity and wherein said coolant distribution structure is disposed relative to said heat sink base structure such that said distribution inlet is communicated with said coolant outlet.
2. A transpiration cooled heat sink according to claim 1 , wherein said coolant distribution structure further includes at least one distribution member, wherein said distribution cavity is disposed within said distribution member.
3. A transpiration cooled heat sink according to claim 1 , wherein said coolant distribution structure is constructed of a porous material.
4. A transpiration cooled heat sink according to claim 1 , wherein said heat sink base is constructed from copper.
5. A transpiration cooled heat sink according to claim 1 , further comprising a distribution outlet communicated with said distribution cavity, a heat transfer surface and a module attachment structure, wherein said module attachment structure defines a plurality of module channels and wherein said heat transfer surface is nonmovably associated with said module attachment structure.
6. A transpiration cooled heat sink according to claim 5 , wherein said heat transfer surface is disposed relative to said module attachment structure so as to be communicated with said distribution outlet and said plurality of module channels.
7. A transpiration cooled heat sink according to claim 5 , further comprising a coolant distribution device disposed within said plurality of module channels so as to be communicated with said distribution outlet and said heat transfer surface.
8. A transpiration cooled heat sink according to claim 7 , wherein said coolant distribution device is constructed of a wicking material.
9. A transpiration cooled heat sink according to claim 7 , wherein said coolant distribution device is cotton string.
10. A transpiration cooled heat sink according to claim 5 , wherein said heat transfer surface is constructed of porous material.
11. A transpiration cooled heat sink according to claim 5 , wherein said heat transfer surface is constructed of copper.
12. A transpiration cooled heat sink according to claim 5 , wherein said module attachment structure is constructed from copper.
13. A self contained coolant supply for a transpiration cooled heat sink comprising:
a coolant production apparatus, said coolant production apparatus having an airflow inlet for receiving an airflow, an airflow outlet for discharging said airflow, a dehumidification unit for extracting a coolant from said airflow and a product outlet for discharging said coolant; and
a coolant storage structure, wherein said coolant storage structure defines a storage cavity for containing said coolant and includes a storage inlet and a storage outlet, wherein said storage inlet is communicated with said storage cavity and said coolant outlet and wherein said storage outlet is communicated with said storage cavity and a transpiration cooled heat sink.
14. A self contained coolant supply for a transpiration cooled heat sink according to claim 13 , further comprising a coolant level measuring device disposed so as to be communicated with said storage cavity.
15. A self contained coolant supply for a transpiration cooled heat sink according to claim 13 , further comprising a pumping device disposed so as to be communicated in series fashion with said storage outlet and said transpiration cooled heat sink.
16. A self contained coolant supply for a transpiration cooled heat sink according to claim 15 , wherein said pumping device is a centrifugal pump.
17. A self contained coolant supply for a transpiration cooled heat sink according to claim 13 , wherein said dehumidification unit includes a control device communicated with a power source.
18. A self contained coolant supply for a transpiration cooled heat sink according to claim 13 , wherein said dehumidification unit is disposed within said coolant production apparatus so as to be communicated with said airflow inlet.
19. A method for using a transpiration cooled heat sink and a self contained coolant supply for a transpiration cooled heat sink comprising:
obtaining a transpiration cooled heat sink having a coolant inlet, a self contained coolant supply for a transpiration cooled heat sink having a dehumidification unit, a coolant storage structure and a storage outlet and an electronic system which includes at least one electronic device having a device outer surface;
positioning said self contained coolant supply within said electronic system so as to receive an airflow;
attaching said transpiration cooled heat sink to said electronic device so as to communicate said transpiration cooled heat sink with said device outer surface;
communicating said coolant inlet with said storage outlet; and
operating said self contained coolant supply so as to produce said coolant.
20. A method according to claim 19 , wherein said attaching said transpiration cooled heat sink to said electronic device includes attaching said transpiration cooled heat sink to said electronic device using clips.
21. A method according to claim 19 , wherein said operating said self contained coolant supply so as to produce said coolant includes operating said dehumidification unit so as to extract a coolant from said airflow and storing said coolant within said coolant storage structure.
22. A method according to claim 19 , wherein said obtaining a transpiration cooled heat sink includes obtaining a self contained coolant supply for a transpiration cooled heat sink having a coolant pump disposed so as to communicate said coolant inlet with said storage outlet.
23. A method according to claim 22 , wherein said operating said self contained coolant supply so as to produce said coolant includes operating said coolant pump so as to cause said coolant to flow from said storage outlet to said coolant inlet.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/965,037 US20030056940A1 (en) | 2001-09-27 | 2001-09-27 | Transpiration cooled heat sink and a self contained coolant supply for same |
US11/083,126 US7353861B2 (en) | 2001-09-27 | 2005-03-17 | Transpiration cooled heat sink and a self contained coolant supply for same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/965,037 US20030056940A1 (en) | 2001-09-27 | 2001-09-27 | Transpiration cooled heat sink and a self contained coolant supply for same |
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US11/083,126 Division US7353861B2 (en) | 2001-09-27 | 2005-03-17 | Transpiration cooled heat sink and a self contained coolant supply for same |
Publications (1)
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US20030056940A1 true US20030056940A1 (en) | 2003-03-27 |
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US09/965,037 Abandoned US20030056940A1 (en) | 2001-09-27 | 2001-09-27 | Transpiration cooled heat sink and a self contained coolant supply for same |
US11/083,126 Expired - Fee Related US7353861B2 (en) | 2001-09-27 | 2005-03-17 | Transpiration cooled heat sink and a self contained coolant supply for same |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US11/083,126 Expired - Fee Related US7353861B2 (en) | 2001-09-27 | 2005-03-17 | Transpiration cooled heat sink and a self contained coolant supply for same |
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US20140085822A1 (en) * | 2012-09-26 | 2014-03-27 | International Business Machines Corporation | Wicking and coupling element(s) facilitating evaporative cooling of component(s) |
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US20200258812A1 (en) * | 2019-02-07 | 2020-08-13 | Ford Global Technologies, Llc | Semiconductor with integrated electrically conductive cooling channels |
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Also Published As
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US7353861B2 (en) | 2008-04-08 |
US20050162833A1 (en) | 2005-07-28 |
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