US20110277491A1 - Heat dissipation system with a spray cooling device - Google Patents
Heat dissipation system with a spray cooling device Download PDFInfo
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- US20110277491A1 US20110277491A1 US12/931,605 US93160511A US2011277491A1 US 20110277491 A1 US20110277491 A1 US 20110277491A1 US 93160511 A US93160511 A US 93160511A US 2011277491 A1 US2011277491 A1 US 2011277491A1
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- heat dissipation
- dissipation system
- chamber
- housing
- fluid
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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
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/433—Auxiliary members in containers characterised by their shape, e.g. pistons
- H01L23/4336—Auxiliary members in containers characterised by their shape, e.g. pistons in combination with jet impingement
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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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
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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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
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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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- 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 invention relates to a heat dissipation system, and more particularly to a closed-loop heat dissipation system that employs a principle of a liquid-vapor phase change.
- An ordinary active-type heat-dissipating system for electronic components such as a fan incorporated with fins, a fan incorporated with fins and heat-transmitting ducts, etc., usually faces a problem of insufficient unit area heat flux and hence cannot meet the requirement for dissipating heat generated by high-powered electronic components.
- An object of the present invention is to provide a heat dissipation system with a simple construction and high heat dissipating efficiency.
- Another object of this invention is to provide a cooling device that can efficiently spray a working fluid to assist vaporization.
- a heat dissipation system for dissipating heat from a heat source includes a cooling device, a condenser, a vapor conveying duct and a cooling liquid conveying duct.
- the cooling device includes a housing, and an orifice plate mounted in the housing.
- the orifice plate divides an inner space of the housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, and has a plurality of micro orifices each having a diameter ranging from 5 to 1000 micrometers.
- the housing has a cooling liquid inlet communicated with the liquid supply chamber and adapted to permit a working fluid to flow into the liquid supply chamber, and a vapor outlet communicated with the evaporation chamber.
- the condenser includes a fluid inlet, a condensing chamber and a fluid outlet.
- the vapor conveying duct is connected to the vapor outlet of the housing and the fluid inlet of the condenser.
- the cooling liquid conveying duct is connected to the cooling liquid inlet of the housing and the fluid outlet of the condenser.
- the cooling device, the condenser, the vapor conveying duct and the cooling liquid conveying duct cooperate to form a closed circuit.
- FIG. 1 is a block diagram illustrating the first preferred embodiment of a cooling system according to the present invention
- FIG. 2 is an exploded perspective view of a cooling device of the first preferred embodiment
- FIG. 3 is a schematic diagram illustrating a working fluid operating inside the cooling device of the first preferred embodiment
- FIG. 4 is perspective view of an orifice plate of the first preferred embodiment
- FIGS. 5 and 6 are schematic diagrams illustrating manufacturing processes of the orifice plate
- FIG. 7 is a schematic diagram illustrating a condenser of the first preferred embodiment
- FIGS. 8 and 9 are top views of the orifice plate used in the second preferred embodiment.
- FIG. 10 is a schematic diagram illustrating the orifice plate that indents downward at its central part during operation
- FIG. 11 is a schematic diagram illustrating the cooling system applied to an LED lamp device.
- FIG. 12 is a schematic diagram illustrating the cooling system applied to a computer housing.
- the cooling system includes a cooling device 1 , a condenser 2 , a vapor conveying duct 3 , a cooling liquid conveying duct 4 , a fluid driving module 5 and a power and control module 6 .
- the cooling device 1 , the condenser 2 , the vapor conveying duct 3 and the cooling liquid conveying duct 4 cooperate to form a closed circuit.
- the fluid driving module 5 has a pump 51 connected to the closed circuit for driving a working fluid, and a control valve 52 connected to the closed circuit for controlling the working fluid.
- the working fluid is one of the Flourinert and Novec series products manufactured by 3M.
- the working fluid may also include water, other liquids.
- the pump 51 may be a piezoelectric thin film type, a gear type, or an electromagnetic type, and is compatible with the working fluid. If the pump 51 can be operated to control the liquid flow, then the control valve 52 can be dispensed with.
- the cooling device 1 includes a housing 11 having a bottom side contacting the heat source 70 , an orifice plate 12 mounted in the housing 11 and a temperature sensing member 13 .
- the orifice plate 12 divides an inner space of the housing 11 into an upper liquid supply chamber 102 and a lower evaporation chamber 103 .
- the housing 11 has a cooling liquid inlet 101 communicated with the liquid supply chamber 102 and adapted to permit a working fluid to flow into the liquid supply chamber 102 , and a vapor outlet 104 communicated with the evaporation chamber 103 .
- the housing 11 has an upper housing part 111 defining the liquid supply chamber 102 and a lower housing part 112 defining the evaporation chamber 103 and assembled to the upper housing part 111 .
- the orifice plate 12 has a thickness ranging from 20 to 300 micrometers and is formed with a plurality of micro orifices 120 arranged in a matrix layout or in intersecting rows.
- Each of the micro orifices 120 has a diameter ranging from 5 to 1000 micrometers.
- the micro orifices 120 are spaced apart from each other by a distance that ranges from 5 to 2000 micrometers.
- the micro orifices 120 have a diameter ranging from 10 to 200 micrometers, preferably, from 5 to 500 micrometers, to provide an improved spraying effect that assists heat dissipation.
- a manufacturing method of making the orifice plate 12 includes the following steps:
- a surface of a substrate body 80 is formed with a metal layer deposited (not shown in the Figure) by a technique, such as physical vapor deposition (abbreviated as PVD), or chemical vapor deposition (abbreviated as CVD).
- a photoresist layer is formed by spin coating, or dip coating. The photoresist layer is exposed through a photomask by a photolithography technique, and is developed to remove the unexposed area of the photoresist layer and to thereby expose parts of the deposited metal layer to be removed. Thereafter, the exposed part of deposited metal layer uncovered by the photoresist layer is etched, and the remaining photoresist layer is removed.
- the deposited metal layer 81 formed on the substrate body 80 is provided with a plurality of holes 810 , as shown in FIG. 5 , which are prefabricated holes for the micro orifices 120 of the orifice plate 12 .
- the holes 810 are larger than the micro orifices 120 .
- another metal layer 83 is formed on the surface of the deposit metal layer 81 by electro-forming in a mold (not shown). After the mold is removed, the metal layer 83 is separated from the substrate body 80 and the metal layer 81 , and the orifice plate 12 as shown in FIG. 4 is obtained.
- the orifice plate 12 may also be made by other methods, such as electro-forming, laser processing, thermal pressure forming, injection molding, etc.
- the orifice diameter of the micro orifices 120 of the orifice plate 12 can be adjusted by the using the aforementioned process.
- Each of the micro orifices 120 includes a liquid intaking end 121 proximate to the liquid supply chamber 102 and a liquid ejecting end 122 proximate to the evaporation chamber 103 .
- the orifice diameter of each of the micro orifices 120 tapers from the liquid intaking end 121 to the liquid ejecting end 122 .
- the working fluid flows into the liquid supply chamber 102 through the cooling liquid inlet 101 , the working fluid is sprayed into the evaporation chamber 103 through the multiple micro orifices 120 .
- the working fluid sprayed into the evaporation chamber 103 forms a thin sprayed layer on a bottom of the evaporation chamber 103 where the heat source 70 is disposed.
- the sprayed layer absorbs heat generated by the heat source 70 and is vaporized. Bubbles 9 are easily formed on the heat source 70 due to vaporization of the working fluid.
- the vapor from the heat source 70 exits from the housing 1 through the vapor outlet 104 .
- the lower housing part 112 has an inner surface formed with microstructure, the surface area thereof is increased, improving the effects of evaporating the working fluid and absorbing heat from the heat source 70 .
- the vapor inside the evaporation chamber 103 flows into the vapor conveying duct 3 through the vapor outlet 104 .
- the vapor conveying duct 3 is made of a material compatible with the working fluid, such as a polymeric material, or stainless steel, and has an inner surface formed with microstructures in order to increase an overall heat transfer surface area and to facilitate condensation of the vapor inside the vapor conveying duct 3 .
- the pump 51 the vapor pressure and the capillary action of the vapor conveying duct 3 , the vapor or the condensed liquid can be drawn into the condenser 2 .
- the condenser 2 includes a chamber casing 21 and a plurality of fins 22 in spatial communication with the chamber casing 21 .
- the fins 22 are hollow, and have interior spaces communicated with an interior of the chamber casing 21 to form a condensing chamber 202 .
- the chamber casing 21 has a fluid inlet 201 in fluid communication with the condensing chamber 202 and a fluid outlet 203 .
- the hollow fins 22 are used for the purpose of increasing heat exchange area and enhancing the effect of condensing the vapor.
- the inner surfaces of the chamber casing 21 and the hollow fins 22 are formed with microstructures to increase the surface area and to enhance condensation effects.
- the chamber casing 21 has an inclined bottom side, the fluid outlet 203 is formed at a lower position of the bottom side, and the fluid inlet 201 is arranged to be higher than the fluid outlet 203 .
- the cooling liquid is permitted to easily flow into the cooling liquid conveying duct 4 .
- the cooling liquid conveying duct 4 is connected to the cooling liquid inlet 101 of the cooling device 1 and the fluid outlet 203 of the condenser 2 .
- this embodiment utilizes the power and control module 6 for supplying power and controlling the fluid driving module 5 .
- the condenser 2 further includes a temperature sensing member 23 for sensing the temperature of the condensing chamber 202 and a pressure sensing member 24 for sensing the pressure of the condensing chamber 202 .
- the power source and control module 6 is connected to the temperature sensing member 23 and the pressure sensing member 24 of the condenser 2 , and the temperature sensing member 13 of the cooling device 1 .
- the sensed temperature and pressure are used as parameters for controlling the speed of the pump 51 , the size of the opening of the control valve 52 , and the switching frequency of the control valve 52 .
- the pump 51 operates according to the control signals from the fluid driving module 5 .
- the control valve 52 opens or closes according to the control signals.
- the second preferred embodiment of this invention differs from the first preferred embodiment in that, the cooling device 1 further includes a plurality of liquid guiding plates 14 mounted on the inner surface of the upper housing part 111 .
- the liquid guiding plates 14 have a center beneath the cooling liquid inlet 101 and extend radially.
- the liquid guiding plates 14 extend concentrically.
- the working fluid When the working fluid enters the housing 1 through the cooling liquid inlet 101 , the working fluid is guided by the liquid guiding plates 14 to flow in the guided directions. As shown in FIG. 10 , the orifice plate 12 indents downward slightly at its central part beneath the cooling liquid inlet 101 because the pressure of the working fluid is relatively high proximate to the cooling liquid inlet 101 . The working fluid flowing through the orifice plate 12 can be sprayed homogeneously into the evaporation chamber 103 .
- the cooling system 100 of this invention can be mounted to an LED lamp device 71 as shown in FIG. 11 .
- the cooling device 1 contacts the LED chip (functioning as the heat source 70 ) and absorbs heat therefrom through phase change.
- the cooling system 100 of this invention can also be mounted inside a computer housing 72 as shown in FIG. 12 .
- the cooling device 1 contacts the central processing unit (functioning as the heat source 70 ).
- the condenser 2 is provided with a fan 25 adjacent to the fins 22 .
Abstract
A heat dissipation system includes a cooling device, a condenser, a vapor conveying duct and a cooling liquid conveying duct. The cooling device includes a housing, and an orifice plate dividing an inner space of the housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, and formed with multiple micro orifices each having a diameter ranging from 5 to 1000 micrometers. The condenser includes a fluid inlet, a condensing chamber and a fluid outlet. The vapor conveying duct connects a vapor outlet of the housing and the fluid inlet of the condenser. The cooling liquid conveying duct connects a cooling liquid inlet of the housing and a fluid outlet of the condenser.
Description
- This application claims priority of Taiwanese application no. 99104710 filed on Feb. 12, 2010.
- 1. Field of the Invention
- The invention relates to a heat dissipation system, and more particularly to a closed-loop heat dissipation system that employs a principle of a liquid-vapor phase change.
- 2. Description of the Related Art
- An ordinary active-type heat-dissipating system for electronic components such as a fan incorporated with fins, a fan incorporated with fins and heat-transmitting ducts, etc., usually faces a problem of insufficient unit area heat flux and hence cannot meet the requirement for dissipating heat generated by high-powered electronic components.
- To meet the requirement for dissipating heat generated by high-powered electronic components, in recent years, heat dissipation technique employing operating principles of liquid-vapor phase change have been developed. For example, a self-contained spray heat dissipation system is disclosed in U.S. Pat. No. 7,082,778. This system operates based on a principle of an ink-jet technology using an ink injecting nozzle incorporating a heated electrode plate. A working fluid is drawn into a spray chamber through surface tension forces and is sprayed in the spray chamber. The sprayed liquid is vaporized when contacting the heated electronic components. During vaporization, part of the heat from the electronic components is absorbed by the vaporized liquid. However, the ink-jet nozzle not only has a complicated structure, but also requires an electrode plate that must be heated, resulting in an increased temperature of the working fluid and reducing an overall heat dissipation effect.
- An object of the present invention is to provide a heat dissipation system with a simple construction and high heat dissipating efficiency.
- Another object of this invention is to provide a cooling device that can efficiently spray a working fluid to assist vaporization.
- Accordingly, a heat dissipation system for dissipating heat from a heat source according to the present invention, includes a cooling device, a condenser, a vapor conveying duct and a cooling liquid conveying duct. The cooling device includes a housing, and an orifice plate mounted in the housing. The orifice plate divides an inner space of the housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, and has a plurality of micro orifices each having a diameter ranging from 5 to 1000 micrometers. The housing has a cooling liquid inlet communicated with the liquid supply chamber and adapted to permit a working fluid to flow into the liquid supply chamber, and a vapor outlet communicated with the evaporation chamber.
- The condenser includes a fluid inlet, a condensing chamber and a fluid outlet. The vapor conveying duct is connected to the vapor outlet of the housing and the fluid inlet of the condenser. The cooling liquid conveying duct is connected to the cooling liquid inlet of the housing and the fluid outlet of the condenser. The cooling device, the condenser, the vapor conveying duct and the cooling liquid conveying duct cooperate to form a closed circuit.
- Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
-
FIG. 1 is a block diagram illustrating the first preferred embodiment of a cooling system according to the present invention; -
FIG. 2 is an exploded perspective view of a cooling device of the first preferred embodiment; -
FIG. 3 is a schematic diagram illustrating a working fluid operating inside the cooling device of the first preferred embodiment; -
FIG. 4 is perspective view of an orifice plate of the first preferred embodiment; -
FIGS. 5 and 6 are schematic diagrams illustrating manufacturing processes of the orifice plate; -
FIG. 7 is a schematic diagram illustrating a condenser of the first preferred embodiment; -
FIGS. 8 and 9 are top views of the orifice plate used in the second preferred embodiment; -
FIG. 10 is a schematic diagram illustrating the orifice plate that indents downward at its central part during operation; -
FIG. 11 is a schematic diagram illustrating the cooling system applied to an LED lamp device; and -
FIG. 12 is a schematic diagram illustrating the cooling system applied to a computer housing. - Before the present invention is described in greater detail with reference to the accompanying preferred embodiments, it should be noted herein that like elements are denoted by the same reference numerals throughout the disclosure.
- Referring to
FIG. 1 , there is shown acooling system 100 according to the first preferred embodiment of the present invention for dissipating heat generated by aheat source 70. The cooling system includes acooling device 1, acondenser 2, avapor conveying duct 3, a coolingliquid conveying duct 4, afluid driving module 5 and a power andcontrol module 6. Thecooling device 1, thecondenser 2, thevapor conveying duct 3 and the coolingliquid conveying duct 4 cooperate to form a closed circuit. Thefluid driving module 5 has apump 51 connected to the closed circuit for driving a working fluid, and acontrol valve 52 connected to the closed circuit for controlling the working fluid. In this embodiment, the working fluid is one of the Flourinert and Novec series products manufactured by 3M. However, the working fluid may also include water, other liquids. Thepump 51 may be a piezoelectric thin film type, a gear type, or an electromagnetic type, and is compatible with the working fluid. If thepump 51 can be operated to control the liquid flow, then thecontrol valve 52 can be dispensed with. - Referring again to
FIGS. 2 and 3 , thecooling device 1 includes ahousing 11 having a bottom side contacting theheat source 70, anorifice plate 12 mounted in thehousing 11 and atemperature sensing member 13. Theorifice plate 12 divides an inner space of thehousing 11 into an upperliquid supply chamber 102 and alower evaporation chamber 103. Thehousing 11 has a coolingliquid inlet 101 communicated with theliquid supply chamber 102 and adapted to permit a working fluid to flow into theliquid supply chamber 102, and avapor outlet 104 communicated with theevaporation chamber 103. Thehousing 11 has anupper housing part 111 defining theliquid supply chamber 102 and alower housing part 112 defining theevaporation chamber 103 and assembled to theupper housing part 111. - Referring to
FIG. 4 , theorifice plate 12 has a thickness ranging from 20 to 300 micrometers and is formed with a plurality ofmicro orifices 120 arranged in a matrix layout or in intersecting rows. Each of themicro orifices 120 has a diameter ranging from 5 to 1000 micrometers. Themicro orifices 120 are spaced apart from each other by a distance that ranges from 5 to 2000 micrometers. In this embodiment, themicro orifices 120 have a diameter ranging from 10 to 200 micrometers, preferably, from 5 to 500 micrometers, to provide an improved spraying effect that assists heat dissipation. - Referring again to
FIGS. 4 , 5 and 6, a manufacturing method of making theorifice plate 12 includes the following steps: - In the beginning, a surface of a
substrate body 80, such as a glass substrate, is formed with a metal layer deposited (not shown in the Figure) by a technique, such as physical vapor deposition (abbreviated as PVD), or chemical vapor deposition (abbreviated as CVD). Next, a photoresist layer is formed by spin coating, or dip coating. The photoresist layer is exposed through a photomask by a photolithography technique, and is developed to remove the unexposed area of the photoresist layer and to thereby expose parts of the deposited metal layer to be removed. Thereafter, the exposed part of deposited metal layer uncovered by the photoresist layer is etched, and the remaining photoresist layer is removed. At this state, the depositedmetal layer 81 formed on thesubstrate body 80 is provided with a plurality ofholes 810, as shown inFIG. 5 , which are prefabricated holes for themicro orifices 120 of theorifice plate 12. Theholes 810 are larger than themicro orifices 120. - Referring to
FIG. 6 , after theholes 810 are formed in themetal layer 81, anothermetal layer 83 is formed on the surface of thedeposit metal layer 81 by electro-forming in a mold (not shown). After the mold is removed, themetal layer 83 is separated from thesubstrate body 80 and themetal layer 81, and theorifice plate 12 as shown inFIG. 4 is obtained. - The
orifice plate 12 may also be made by other methods, such as electro-forming, laser processing, thermal pressure forming, injection molding, etc. - Referring back to
FIGS. 2 , 3 and 4, the orifice diameter of themicro orifices 120 of theorifice plate 12 can be adjusted by the using the aforementioned process. Each of themicro orifices 120 includes a liquidintaking end 121 proximate to theliquid supply chamber 102 and aliquid ejecting end 122 proximate to theevaporation chamber 103. The orifice diameter of each of themicro orifices 120 tapers from the liquidintaking end 121 to theliquid ejecting end 122. - When the working fluid flows into the
liquid supply chamber 102 through the coolingliquid inlet 101, the working fluid is sprayed into theevaporation chamber 103 through the multiplemicro orifices 120. The working fluid sprayed into theevaporation chamber 103 forms a thin sprayed layer on a bottom of theevaporation chamber 103 where theheat source 70 is disposed. The sprayed layer absorbs heat generated by theheat source 70 and is vaporized.Bubbles 9 are easily formed on theheat source 70 due to vaporization of the working fluid. The vapor from theheat source 70 exits from thehousing 1 through thevapor outlet 104. - In this embodiment, because the
lower housing part 112 has an inner surface formed with microstructure, the surface area thereof is increased, improving the effects of evaporating the working fluid and absorbing heat from theheat source 70. - Referring back to
FIGS. 1 and 3 , the vapor inside theevaporation chamber 103 flows into thevapor conveying duct 3 through thevapor outlet 104. In this embodiment, thevapor conveying duct 3 is made of a material compatible with the working fluid, such as a polymeric material, or stainless steel, and has an inner surface formed with microstructures in order to increase an overall heat transfer surface area and to facilitate condensation of the vapor inside thevapor conveying duct 3. By virtue of thepump 51, the vapor pressure and the capillary action of thevapor conveying duct 3, the vapor or the condensed liquid can be drawn into thecondenser 2. - Referring to
FIG. 7 , thecondenser 2 includes achamber casing 21 and a plurality offins 22 in spatial communication with thechamber casing 21. Thefins 22 are hollow, and have interior spaces communicated with an interior of thechamber casing 21 to form a condensingchamber 202. Thechamber casing 21 has afluid inlet 201 in fluid communication with the condensingchamber 202 and afluid outlet 203. In this embodiment, thehollow fins 22 are used for the purpose of increasing heat exchange area and enhancing the effect of condensing the vapor. Besides, the inner surfaces of thechamber casing 21 and thehollow fins 22 are formed with microstructures to increase the surface area and to enhance condensation effects. When the vapor enters from thefluid inlet 201 to the condensingchamber 202, a rapid heat exchange can be effected to reduce the temperature of the vapor and to condense the same. - Preferably, the
chamber casing 21 has an inclined bottom side, thefluid outlet 203 is formed at a lower position of the bottom side, and thefluid inlet 201 is arranged to be higher than thefluid outlet 203. With such a design, the cooling liquid is permitted to easily flow into the coolingliquid conveying duct 4. The coolingliquid conveying duct 4 is connected to the coolingliquid inlet 101 of thecooling device 1 and thefluid outlet 203 of thecondenser 2. - Referring again to
FIG. 1 , this embodiment utilizes the power andcontrol module 6 for supplying power and controlling thefluid driving module 5. Thecondenser 2 further includes atemperature sensing member 23 for sensing the temperature of the condensingchamber 202 and apressure sensing member 24 for sensing the pressure of the condensingchamber 202. The power source andcontrol module 6 is connected to thetemperature sensing member 23 and thepressure sensing member 24 of thecondenser 2, and thetemperature sensing member 13 of thecooling device 1. The sensed temperature and pressure are used as parameters for controlling the speed of thepump 51, the size of the opening of thecontrol valve 52, and the switching frequency of thecontrol valve 52. Thepump 51 operates according to the control signals from thefluid driving module 5. Thecontrol valve 52 opens or closes according to the control signals. - Referring back to
FIGS. 1 , 2 and further toFIGS. 8 to 10 , the second preferred embodiment of this invention differs from the first preferred embodiment in that, thecooling device 1 further includes a plurality ofliquid guiding plates 14 mounted on the inner surface of theupper housing part 111. InFIG. 8 , theliquid guiding plates 14 have a center beneath the coolingliquid inlet 101 and extend radially. InFIG. 9 , theliquid guiding plates 14 extend concentrically. - When the working fluid enters the
housing 1 through the coolingliquid inlet 101, the working fluid is guided by theliquid guiding plates 14 to flow in the guided directions. As shown inFIG. 10 , theorifice plate 12 indents downward slightly at its central part beneath the coolingliquid inlet 101 because the pressure of the working fluid is relatively high proximate to the coolingliquid inlet 101. The working fluid flowing through theorifice plate 12 can be sprayed homogeneously into theevaporation chamber 103. - The
cooling system 100 of this invention can be mounted to anLED lamp device 71 as shown inFIG. 11 . Thecooling device 1 contacts the LED chip (functioning as the heat source 70) and absorbs heat therefrom through phase change. Thecooling system 100 of this invention can also be mounted inside acomputer housing 72 as shown inFIG. 12 . Thecooling device 1 contacts the central processing unit (functioning as the heat source 70). To enhance counter flow and heat dissipation effect, thecondenser 2 is provided with afan 25 adjacent to thefins 22. - While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Claims (22)
1. A heat dissipation system for dissipating heat from a heat source, said heat dissipation system comprising:
a cooling device including a housing, and an orifice plate that divides an inner space of said housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, said housing having a cooling liquid inlet communicated with said liquid supply chamber and adapted to permit a working fluid to flow into said liquid supply chamber, and a vapor outlet communicated with said evaporation chamber, said orifice plate having a plurality of micro orifices, each of which has a diameter ranging from 5 to 1000 micrometers;
a condenser including a fluid inlet, a condensing chamber and a fluid outlet;
a vapor conveying duct connected to said vapor outlet of said housing and said fluid inlet of said condenser; and
a cooling liquid conveying duct connected to said cooling liquid inlet of said housing and said fluid outlet of said condenser;
wherein said cooling device, said condenser, said vapor conveying duct and said cooling liquid conveying duct cooperate to form a closed circuit.
2. The heat dissipation system as claimed in claim 1 , wherein each of said micro orifices of said orifice plate has a liquid intaking end and a liquid ejecting end, each of said micro orifices tapering from said liquid intaking end to said liquid ejecting end.
3. The heat dissipation system as claimed in claim 2 , wherein said orifice plate of said cooling device is formed by electro-forming, laser processing, thermal pressure forming, or injection molding.
4. The heat dissipation system as claimed in claim 1 , wherein each of said micro orifices has a diameter ranging from 5 to 500 micrometers.
5. The heat dissipation system as claimed in claim 4 , wherein, each of said micro orifices has a diameter ranging from 10 and 200 micrometers.
6. The heat dissipation system as claimed in claim 1 , wherein said micro orifices are spaced from each other by a distance that ranges from 5 to 2000 micrometers.
7. The heat dissipation system as claimed in claim 1 , wherein said orifice plate has a thickness ranging from 20 to 300 micrometers.
8. The heat dissipation system as claimed in claim 1 , wherein said housing of said cooling device has an upper housing part defining said liquid supply chamber and a lower housing part defining said evaporation chamber and assembled to said upper housing part.
9. The heat dissipation system as claimed in claim 8 , wherein said lower housing part has an inner surface formed with microstructure for enhancing vaporization effect.
10. The heat dissipation system as claimed in claim 8 , wherein said cooling device further includes a plurality of flow guiding plates mounted on an inner surface of said upper housing part.
11. The heat dissipation system as claimed in claim 1 , wherein said condenser includes a chamber casing, and a plurality of fins connected to said chamber casing.
12. The heat dissipation system as claimed in claim 11 , wherein each of said fins is hollow and has an interior space communicated with an interior of said chamber casing, said chamber casing and said fins defining said condensing chamber.
13. The heat dissipation system as claimed in claim 12 , wherein said chamber casing of said cooling device has an inclined bottom side, said fluid outlet being formed at a lower part of said bottom side, said fluid inlet being higher than said fluid outlet.
14. The heat dissipation system as claimed in claim 12 , wherein said condenser further includes a fan adjacent to said fins.
15. The heat dissipation system as claimed in claim 12 , wherein said chamber casing and said fins have inner surfaces formed with microstructures to enhance a condensation effect.
16. The heat dissipation system as claimed in claim 1 , wherein said vapor conveying duct has an inner surface formed with microstructures that enhance a condensation effect.
17. The heat dissipation system as claimed in claim 1 , further comprising a fluid driving module that includes a pump connected to said closed circuit for drawing the working fluid.
18. The heat dissipation system as claimed in claim 17 , wherein said fluid driving module further includes a control valve inserted into said closed circuit for controlling the flow rate of the working fluid.
19. The heat dissipation system as claimed in claims 17 , further comprising a power and control module for supplying power and controlling the operation of said closed circuit.
20. The heat dissipation system as claimed in claim 19 , wherein said cooling device further includes a temperature sensing member for sensing a temperature of the heat source, said power and control module being connected to said temperature sensing member and controlling said fluid driving module based on the temperature sensed by said temperature sensing member.
21. The heat dissipation system as claimed in claims 19 , wherein said condenser further includes temperature sensing member for sensing a temperature in said condensing chamber and a pressure sensing member for sensing a pressure in said condensing chamber, said power and control module being connected to said temperature sensing member and said pressure sensing member, and controlling said fluid driving module based on the temperature sensed by said temperature sensing member and the pressure sensed by said pressure sensing member.
22. A cooling device included in a heat dissipation system as claimed in claim 1 , comprising: a housing, and an orifice plate dividing an inner space of said housing into a liquid supply chamber and an evaporation chamber proximate to a heat source, said housing having a cooling liquid inlet communicated with said liquid supply chamber and adapted to permit a working fluid to flow into said liquid supply chamber, and a vapor outlet communicated with said evaporation chamber, said orifice plate having a plurality of micro orifices, each of which has a diameter ranging from 5 to 1000 micrometers.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW99104710A TW201128154A (en) | 2010-02-12 | 2010-02-12 | Cooling and heat-dissipation system, and cooling device thereof |
TW099104710 | 2010-02-12 |
Publications (1)
Publication Number | Publication Date |
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US20110277491A1 true US20110277491A1 (en) | 2011-11-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/931,605 Abandoned US20110277491A1 (en) | 2010-02-12 | 2011-02-03 | Heat dissipation system with a spray cooling device |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110277491A1 (en) |
EP (1) | EP2360725A2 (en) |
JP (1) | JP2011163751A (en) |
TW (1) | TW201128154A (en) |
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Also Published As
Publication number | Publication date |
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TW201128154A (en) | 2011-08-16 |
JP2011163751A (en) | 2011-08-25 |
EP2360725A2 (en) | 2011-08-24 |
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