Abstract:
An apparatus, system and method for multi-orientation single or two phase coldplate with positive flow characteristics is disclosed. In representative embodiments and applications, the present invention generally provides improved methods and systems for cooling through fluid cooled coldplates.

Description:
RELATED APPLICATIONS 
       [0001]    This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/867,717 filed in the United States Patent and Trademark Office on Nov. 29, 2006. 
     
    
     BACKGROUND OF INVENTION 
       [0002]    Various techniques are used to facilitate cooling of mechanical and electronic equipment. The ability to provide sufficient cooling to components that experience heat gain is essential to proper function and product reliability. Common methods of cooling typically include forced movement of ambient air, radiators, heatsinks, and use of cooling liquids. Cooling may be as simple as using a fan to move relatively cooler air over a component that has experienced. 
         [0003]    Prior attempts to address this problem have resulted in coldplates that have difficulty maintaining uniform fluid velocity in the flow region due to gravitational effects when the coldplate is positioned in multiple orientations. Regions also develop where fluid velocity in the flow region is greatly reduced, affecting the ability of the coldplate to transfer heat. Additionally, coldplates with unidirectional fluid flow have large local temperature deltas. Accordingly, there exists a need to address these and other deficiencies associated with conventional techniques. 
       SUMMARY OF THE INVENTION 
       [0004]    In a representative aspect, the present invention includes a system and method for improved equipment cooling. The system comprises a fluid cooled coldplate and/or the like. In accordance with various aspects of the present invention, the system may provide cooling regardless of the orientation of the coldplate during operation. The coldplate may be designed to provide substantially uniform fluid velocity throughout the coldplate thereby reducing localized regions of trapped fluid and increasing the cooling efficiency of the system. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    Representative elements, operational features, applications and/or advantages of the present invention reside inter alia in the details of construction and operation as more fully hereafter depicted, described or otherwise identified—reference being made to the accompanying drawings, images, figures, etc. forming a part hereof—wherein like numerals refer to like parts throughout. Other elements, operational features, applications and/or advantages will become apparent in view of certain exemplary embodiments recited in the claims. 
           [0006]      FIG. 1  representatively illustrates a coldplate system in accordance with a representative embodiment of the present invention; 
           [0007]      FIG. 2  representatively illustrates a single coldplate in accordance with a representative embodiment of the present invention. 
           [0008]      FIG. 3  representatively illustrates an inlet section of a cooling plate in accordance with a representative embodiment of the present invention; 
           [0009]      FIG. 4  representatively illustrates a transition between flow directions in a cooling plate in accordance with a representative embodiment of the present invention; and 
           [0010]      FIG. 5  representatively illustrates an exit area of a cooling plate in accordance with a representative embodiment of the present invention. 
       
    
    
       [0011]    Elements in the figures, drawings, images, etc. are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of various embodiments of the present invention. Furthermore, the terms ‘first’, ‘second’, and the like herein, if any, are used inter alia for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. Moreover, the terms ‘front’, ‘back’, ‘top’, ‘bottom’, ‘over’, ‘under’, and the like in the disclosure and/or in the claims, are generally employed for descriptive purposes and not necessarily for comprehensively describing exclusive relative position. It will be understood that any of the preceding terms so used may be interchanged under appropriate circumstances such that various embodiments of the invention described herein, for example, are capable of operation in other configurations and/or orientations than those explicitly illustrated or otherwise described. 
       DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0012]    The following representative descriptions of the present invention generally relate to exemplary embodiments and the inventors&#39; conception of the best mode, and are not intended to limit the applicability or configuration of the invention in any way. Rather, the following description is intended to provide convenient illustrations for implementing various embodiments of the invention. As will become apparent, changes may be made in the function and/or arrangement of any of the elements described in the disclosed exemplary embodiments without departing from the spirit and scope of the invention. 
         [0013]    The present invention may be described herein in terms of conventional coldplates, flow passages, and fluids. Further, the present invention may employ any number of conventional techniques for fluid cooling and/or the like. 
         [0014]    It should be appreciated that coldplates in accordance with various aspects of the present invention may comprise any number of conventional materials including but not limited to ceramics, metals, plastics, fiberglass, glass, various other inorganic and organic materials and/or the like. Further, coldplates in accordance with the present invention may comprise various forms, layers, sizes, thicknesses, textures and dimensions and/or the like. 
         [0015]    Referring now to  FIG. 1 , a system for providing a multi-orientation coldplate  100  in accordance with various aspects of the present invention may be implemented in conjunction with a series of coldplate sections  110 A-E and series of fluid flow sections  112 A-F. The multi-orientation coldplate  100  may be configured such that the gravitational effects on the fluid are minimized regardless of the position of the multi-orientation coldplate  100  during use or installation. The multi-orientation coldplate  100  may comprise any suitable material such as ceramics, metals, plastics, fiberglass, glass, various other inorganic and organic materials and/or the like. 
         [0016]    It should be appreciated that in accordance with various aspects of the present invention the flow sections  112  may be configured in any appropriate pattern and/or shape depending upon the specific application. For example, in a representative embodiment of the present invention, the flow sections  112  may comprise circular tubes and/or channels with one or more flattened sides. 
         [0017]    In another representative embodiment of the present invention, a single bi-directional coldplate section, such as  112 A, may comprise any suitable flow shape and further comprise partitions, channels, and/or fins for directing the fluid and to increase the surface area the fluid comes into contact with. 
         [0018]    A coldplate section  110  in accordance with various aspects of the present invention may comprise multiple flow paths to modify local temperature deltas by forcing the fluid to sweep all regions of the coldplate despite the gravitational effects of installation or position during operation. In a representative embodiment of the present invention, each flow path may comprise an inlet, an outlet, and a set of partitions, channels, and/or fins that direct the flow direction of the fluid. 
         [0019]    The cooling fluid in accordance with various aspects of the present invention may comprise any fluid, liquid/vapor and/or liquid/gas mixture suitable for cooling, stabilizing temperature and/or the like. In a representative embodiment of the present invention, the fluid may comprise any liquid that substantially maintains its physical state throughout the cooling cycle. The fluid may also be suitably configured to resist boiling. In another representative embodiment of the present invention, the fluid is suitably configured to absorb and/or dissipate heat. 
         [0020]    It should be appreciated that in accordance with various aspects of the present invention the cooling fluid may be configured to function at various temperatures. For example, in a representative embodiment of the present invention, the cooling fluid may comprise any combination of water and propylene glycol, such as in a 50:50 ratio, and the fluid may be implemented in conjunction with the coldplate system to function at temperatures above and/or to about −30° C. In another representative embodiment of the present invention, the coldplate system may comprise a mixture of water and methanol, such as in a 50:50 ratio, and may be implemented in conjunction with a cooling system to function at temperatures below about −30° C. 
         [0021]    Referring now to  FIG. 2 , in a representative embodiment of the present invention, a series of fins  210  of varying lengths may be employed in two separate flow regions  212  and  214 . The fins  210  may comprise any suitable material such as ceramics, metals, plastics, fiberglass, glass, various other inorganic and organic materials and/or the like. The fins  210  generally direct the flow of the fluid and increase the surface area in contact with the fluid to facilitate the heat transfer between the fluid and the coldplate section  110 . 
         [0022]    In another representative embodiment of the present invention, the fins  210  may be oriented in a graduated manner at the inlet to flow region  212  that is substantially perpendicular to the flow of the incoming fluid. For example, referring now to  FIG. 3 , the graduated fins  210  may have the effect of reducing the volume in the inlet  310  as the fluid flows into the flow region  212  resulting in a more uniform fluid velocity throughout substantially the entire flow region  212 . 
         [0023]    The inlet  310  in accordance with various aspects of the present invention may further be configured with a surface that directs the fluid towards the fins  210  in order to obtain a more uniform fluid velocity through the fins  210 . The surface may comprise any system for directing the flow of the fluid, such as an insert, a protrusion, a dome, a flange and/or the like. In a representative embodiment of the present invention, a protrusion  312  may be implemented to form a guiding wall that more efficiently direct the cooling fluid onto the graduated fins  210  and account for the momentum affects of the incoming fluid. 
         [0024]    It should be appreciated that in accordance with various aspects of the present invention the coldplate section  110  may also comprise a transition section between the flow regions  212  and  214 . In a representative embodiment of the present invention, fluid initially flows into the bi-directional coldplate section in one direction, through a set of fins  210 , and is then redirected through a transition section to a second set of fins  210  where it flows in a different direction. In another representative embodiment of the present invention, the flow regions  212  and  214  are configured in substantially the opposite in direction. 
         [0025]    It should be appreciated that, in accordance with various aspects of the present invention, the transition section may be configured in any way that results in the redirection of the flow of the fluid such as a bend in a pipe, an angled channel, and/or a series of ducts. 
         [0026]    Referring now to  FIG. 4 , in a representative embodiment of the present invention, the transition section  410  may comprise a combination of a diverging region  412  and a converging region  414 . The outlet section  412  may comprise the region where the first flow region  212  empties. The diverging region  412  may be configured to provide an increase in the volumetric area as the number of fins  210  increase in order to maintain a substantially uniform flow velocity of the cooling fluid. The converging region  414  may be positioned immediately downstream from the diverging region  412 . The converging region  414  may be configured similar to the inlet of the coldplate section  110  with a protrusion  416  and a series of graduated fins  210  positioned substantially perpendicular to the flow of the fluid. 
         [0027]    In another representative embodiment of the present invention, the transition section  410  may further comprise an element directed to reducing flow separation of the fluid in the transition area. The element may comprise any suitable method for achieving reduced flow separation such as a round off, an angled edge and/or corner, and/or a smooth edge in the direction of the desired flow path. For example, a rounded corner  418  is located in the flow channel nearest the transition point between the diverging region  412  and the converging region  414 . 
         [0028]    Referring now to  FIG. 5 , a coldplate section  110  may further comprise an outlet  510  of varying geometry. The outlet may be configured in any suitable way to provide an increase in volume in the outlet  510  as the number flow channels emptying into the outlet  510  increases. For example, in a representative embodiment of the present invention, the wall of the coldplate section  110  at the outlet  510  is configured to provide an increase in the volumetric area as the number of fins  210  empty fluid into the outlet  510  increases. Alternatively and/or conjunctively, in another representative embodiment of the present invention, the outlet  510  may comprise a constant volumetric area and the length of the fins  210  could be graduated in a manner similar to the inlet  310  such that the volume of the outlet  510  increases in the direction of the cooling fluid flow. 
         [0029]    Multi-orientation coldplate system  100 , in accordance with various aspects of the present invention, may be implemented such that a fluid is passed through the multi-orientation coldplate  100  in order to transfer heat from the surrounding area through the multi-orientation coldplate  100  and into the fluid and/or from the fluid through the multi-orientation coldplate  100  and to the surrounding area. In a representative embodiment of the present invention, the multi-orientation coldplate  100  comprises series of coldplate sections  110 A-F. 
         [0030]    The coldplate sections  110 A-F may be configured to comprise one or more flow regions such that the velocity of the fluid may be substantially uniform throughout the coldplate section  110  thereby reducing localized temperature deltas at each coldplate  110 . In a representative embodiment of the present invention, the multi-orientation coldplate  100  may be configured such that as the fluid enters the multi-orientation coldplate  100  it is directed into a first coldplate section  110 A. The fluid may move into a first flow region  212  towards one or more fins  210  that redirect the fluid approximately ninety degrees along a series of flow channels where heat is then transferred into the fluid. 
         [0031]    In another representative embodiment of the present invention, after redirection by one or more fins  210 , the fluid flows into a region where the volumetric area increases in the direction of the fluid flow and the flow direction is again redirected approximately ninety degrees. The fluid may then move into a second flow region  214  where a second set of fins  210  are positioned to again redirect the flow approximately ninety degrees along a series of flow channels where heat is transferred into the fluid. Thereafter, the fluid may flow into a second expanding volumetric region before being directed out of the coldplate section  110 . The fluid may then follow a flow section  112  before entering another coldplate section  110  to repeat the process. 
         [0032]    The multiplate orientation coldplate system, in accordance with various aspects of the present invention, may be implemented to at least partially increase the effectiveness of uniform fluid velocity maintenance in a flow region due to gravitational effects. In a representative embodiment of the present invention, use of a multiplate orientation coldplate system may allow the coldplate&#39;s ability to transfer heat to be at least substantially maintained. In another representative embodiment of the present invention, fluid velocity in a flow region may be substantially maintained when a coldplate in accordance with the present invention is oriented in multiple directions. In yet a further embodiment of the present invention, multi-orientation coldplate systems in accordance with the present invention may comprise and/or maintain larger temperature deltas than conventional coldplates. 
         [0033]    In the foregoing specification, the invention has been described with reference to specific exemplary embodiments. Various modifications and changes may be made, however, without departing from the scope of the present invention as set forth in the claims. The specification and figures are illustrative, rather than restrictive, and modifications are intended to be included within the scope of the present invention. Accordingly, the scope of the invention should be determined by the claims and their legal equivalents rather than by merely the examples described. 
         [0034]    For example, the steps recited in any method or process claims may be executed in any order and are not limited to the specific order presented in the claims. Additionally, the components and/or elements recited in any apparatus claims may be assembled or otherwise operationally configured in a variety of permutations and are accordingly not limited to the specific configuration recited in the claims. 
         [0035]    Benefits, other advantages and solutions to problems have been described above with regard to particular embodiments; however, any benefit, advantage, solution to problem or any element that may cause any particular benefit, advantage or solution to occur or to become more pronounced are not to be construed as critical, required or essential features or components of any or all the claims. 
         [0036]    As used herein, the terms “comprise”, “comprises”, “comprising”, “having”, “including”, “includes” or any variation thereof, are intended to reference a non-exclusive inclusion, such that a process, method, article, composition or apparatus that comprises a list of elements does not include only those elements recited, but may also include other elements not expressly listed or inherent to such process, method, article, composition or apparatus. Other combinations and/or modifications of the above-described structures, arrangements, applications, proportions, elements, materials or components used in the practice of the present invention, in addition to those not specifically recited, may be varied or otherwise particularly adapted to specific environments, manufacturing specifications, design parameters or other operating requirements without departing from the general principles of the same.