US20080251240A1 - Integrated heat exchangers in a rack for vertical board style computer systems - Google Patents
Integrated heat exchangers in a rack for vertical board style computer systems Download PDFInfo
- Publication number
- US20080251240A1 US20080251240A1 US12/052,599 US5259908A US2008251240A1 US 20080251240 A1 US20080251240 A1 US 20080251240A1 US 5259908 A US5259908 A US 5259908A US 2008251240 A1 US2008251240 A1 US 2008251240A1
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- US
- United States
- Prior art keywords
- air
- heat exchanger
- enclosure
- rack
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20718—Forced ventilation of a gaseous coolant
- H05K7/20736—Forced ventilation of a gaseous coolant within cabinets for removing heat from server blades
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/203—Cooling means for portable computers, e.g. for laptops
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20763—Liquid cooling without phase change
- H05K7/20781—Liquid cooling without phase change within cabinets for removing heat from server blades
Definitions
- FIGS. 3 and 4 are front and side views, respectively, schematically illustrating another system for cooling heat generating objects in a cabinet.
- the second fan 24 can be attached directly to the top of cabinet 16 .
- fan 24 can be contained at the upper portion of cabinet 16 , such as intermediate between top heat exchanger 18 and the air outlet in the top panel of the cabinet.
- second fan 24 can be separated from the top of cabinet 16 by some distance, which can range from several millimeters to greater distances which will depend upon the strength of fan 24 .
- second fan 24 can be suspended from a roof structure, or be a part of or added into an existing cooling system.
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- General Physics & Mathematics (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
A system for cooling heat-generating objects, such as computer boards situated in a rack, includes an enclosure in which the heat generating objects are situated. The enclosure has an air inlet and an air outlet, and a fan induces airflow into the air inlet, through the enclosure and out the air outlet. A heat exchanger is situated in the enclosure such that the heat exchanger is in a spaced apart relationship with the heat-generating object. Air moving through or past the heat-generating object is warmed, and the heat exchanger removes the heat before the air exits the enclosure.
Description
- The present application claims priority to U.S. Provisional Patent Application Ser. No. 60/522,857 filed Nov. 14, 2004, the contents of all of which are incorporated herein by reference.
- The present disclosure relates to systems for cooling electronic and other heat-generating equipment, and more particularly to systems for cooling the air flowing in proximity to electronic equipment configured in vertical banks in a rack or cabinet.
- The growth of the computer industry over the past few decades has been phenomenal. Many new computer designs combine multiple computer/processor boards to make “high end” computers and “servers”. Due to the demand for floor space, computer boards are often configured to be “stacked” vertically in a rack or cabinet. Many existing cooling systems for electronic equipment contained in such a vertical rack do not provide adequate cooling. In many of these cooling systems, air is drawn into the bottom of the rack or cabinet containing computer boards and moved vertically through the cabinet, progressively cooling the respective computer boards. In this design, the boards mounted “higher” in the rack receive warmer air than those mounted toward the bottom because the air has already passed over and absorbed heat from one or more boards. Consequently, the “higher” boards are not adequately cooled by the flow of warmer air.
- At the same time, newer, more powerful microprocessors are constantly being introduced, but this higher performance is generally accompanied by significantly increased heat generation. Thus, these newer processor configurations are driving up heat loads to the point that “unaided” air cooling cannot provide enough capacity to keep these “stacked” computers from overheating. As a result, “stacked” servers may have to operate at reduced processing speeds to limit the heat load, which in turn compromises performance.
- In addition, existing cooling systems have a rather limited cooling capability. For instance, many existing cooling systems have heat densities of approximately 80 watts per square foot (W/ft2), though some cooling systems still under development are said to possess heat densities of up to 150 W/ft2. Even cooling systems having these heat densities, however, may not effectively cool today's state-of-the-art electronic equipment.
- As is readily apparent, if equipment is not sufficiently cooled, the internal temperature of the electronic components in the equipment dramatically increases over relatively short periods of time, which may result in significantly reduced system performance and, in some cases, component or total system failure. Even where system performance is not compromised, inefficient cooling may unnecessarily increase the cost of cooling the equipment. Thus, there remains a need for a cooling system that adequately and efficiently cools computer boards configured in vertical banks in a rack.
- A system for cooling heat generating objects, such as computer boards situated in a rack, includes an enclosure in which the heat generating objects are situated. The enclosure has an air inlet and an air outlet, and a fan induces air flow into the air inlet, through the enclosure and out the air outlet. The fan may be situated adjacent the air inlet or outlet, or multiple fans may be used at the inlet and outlet. A heat exchanger is situated in the enclosure such that the heat exchanger is in a spaced apart relationship with the heat-generating object. Air moving through or past the heat-generating object is warmed, and the heat exchanger removes the heat before the air exits the enclosure.
- In certain exemplary embodiments, the heat exchanger is situated adjacent the air inlet. In further embodiments, the heat exchanger is situated adjacent the air outlet, or heat exchangers are situated at both the inlet and outlet of the enclosure. Often, a plurality of heat-generating objects are situated vertically in the enclosure, and a plurality of heat exchangers are situated in the enclosure such that a heat exchanger is situated between adjacent heat generating objects in a spaced-apart relationship.
- Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings in which:
-
FIG. 1 is a perspective view schematically illustrating a system for cooling heat generating objects in a cabinet. -
FIG. 2 is a perspective view schematically illustrating an alternative system for cooling heat generating objects in a cabinet. -
FIGS. 3 and 4 are front and side views, respectively, schematically illustrating another system for cooling heat generating objects in a cabinet. - While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
- Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
- Turning now to
FIG. 1 , therein is illustrated an embodiment of acooling system 10 for cooling heat generatingobjects 12 configured in banks within an enclosure such as acabinet 16. Typically, the heat generating objects consist of electronic assemblies, such as circuit board assemblies, received in racks in thecabinet 16. The cooling system includes afan 14, which induces airflow in the direction ofarrow 15, into thecabinet 16 through an inlet, upwardly and through thecabinet 16, exiting thecabinet 16 through an outlet. It will be apparent to one skilled in the art thatfan 14 can be located at any position that will induce airflow throughcabinet 16, and that a plurality of fans can be used. Theairflow 15 cools theelectronic equipment 12 as it passes through each bank of equipment. The cooling of theelectronic equipment 12 causes an increase in the temperature of the flowing air stream, such thatair stream 19 exiting the outlet at the top ofcabinet 16 is warmer than that entering the air inlet of thecabinet 16. The air stream itself is cooled as it passes theheat exchangers 20 located between each bank ofelectronic equipment 12. Theheat exchangers 20 are spaced apart from theequipment 12 such that an air space is defined between theequipment 12 and theheat exchangers 20. Theair stream 19 is also cooled as it passes through thetop heat exchanger 18 and exits outward, away from the components withincabinet 16, so that it does not add any unnecessary heat load to the room air conditioning. - Another
system 10A is shown inFIG. 2 , wherein aheat exchanger 22 is in front of, or alternately, before the first heat load or heat-generating device 12. As illustrated inFIG. 2 ,front heat exchanger 22 can be placed in-betweenfan 14 and the first heat-generatingdevice 12. This allows for air to be “pre-cooled” prior to entering into or around the heat-generating devices. In a typical scenario,fan 14 induces airflow in the direction ofarrow 15, upwardly and intocabinet 16 through an air inlet. The airflow first passes throughfront heat exchanger 22, where it is cooled prior to coming into contact with theheat generating devices 12. The now pre-cooled air then flows upwardly, through and/or aroundheat generating devices 12, and optionally through one or more additional, intermediate heat-exchangers 20, before passing throughtop heat exchanger 18 and exiting thecabinet 16 through an air outlet. As described previously, inclusion of atop heat exchanger 18 allows for theair steam 19 exiting thecabinet 16 to be cooled prior to exiting into the room, so as to minimize the effect on the heat load to the room air conditioning. As shown inFIG. 2 , theheat generating devices 12 and thecorresponding heat exchangers heat generating object 12 and the adjacent heat exchanger(s). -
FIGS. 3 and 4 schematically illustrate front and side views of anotherexemplary cooling system 10B. As shown therein,cooling system 10B comprises afirst fan 14 spaced in front of, or beforefront heat exchanger 22. Thesystem 10B also comprises a plurality of heat-generatingdevices 12 arranged vertically (onedevice 12 positioned above another) withincabinet 16, with one ormore heat exchangers 20 interspaced between them as necessary in order to obtain the most efficient cooling, as well as atop heat exchanger 18 spaced downstream of the heat-generatingdevices 12, but still withincabinet 16. An air space is defined between eachdevice 12 and theadjacent heat exchanger 20. At the top end ofsystem 10B near the cabinet's air outlet is a second fan, 24, which can be mounted externally to thecabinet 16, or can be optionally contained withincabinet 16. The use of asecond fan 24 allows for the air that has been cooled bytop heat exchanger 18 to be pulled upward and/or away fromcabinet 16 and the components housed therein, so as to aid in minimizing addition of extra heat load to the room air conditioning system. In operation, the airflow stream is pulled intosystem 10B byfirst fan 14, and moves in the direction ofarrow 15. Airflow is directed upward, through the cabinet, cooling theheat generating devices 12 as it passes through each bank. This airflow is itself further cooled as it passesfront heat exchanger 20 and through or around theother heat exchangers 20 interspersed betweendevices 12. The airflow stream is then cooled a final time as it passes through or aroundtop heat exchanger 18, and is drawn upward and out ofcabinet 16 bysecond fan 24, pushing the air away fromcabinet 16 and the components contained therein. - The
second fan 24, as illustrated inFIGS. 3 and 4 , can be attached directly to the top ofcabinet 16. Alternatively, and equally acceptable,fan 24 can be contained at the upper portion ofcabinet 16, such as intermediate betweentop heat exchanger 18 and the air outlet in the top panel of the cabinet. Equally acceptable,second fan 24 can be separated from the top ofcabinet 16 by some distance, which can range from several millimeters to greater distances which will depend upon the strength offan 24. For example,second fan 24 can be suspended from a roof structure, or be a part of or added into an existing cooling system. -
FIGS. 1-4 show exemplary systems each having a plurality of heat generating objects and heat exchangers. Other embodiments include a single heat exchanger, such asfront heat exchanger 22, downsteam of a heat-generating device such as a bank of computer boards. Such a cooling system could be particularly useful for aiding in the cooling of heat-generating equipment that does not need more than one heat exchanger in order to be effectively and efficiently cooled. A further advantage of the present invention is that it is scalable: that is, as many heat exchangers can be added incrementally as computer size and architecture dictate. As used herein, the term “downstream” refers to objects which follow another object, while the term “upstream” refers to objects which come before (although not necessarily immediately before) another object. In example, referring toFIG. 1 ,heat exchangers 20 are “downstream” offan 14, andfan 14 is “upstream” of heat generating objects 12. - In certain exemplary embodiments, the heat exchangers are micro-channel refrigerant heat exchangers placed in the air stream after each vertically oriented bank of computer boards or other heat-generating device. With the use of micro-channel heat exchangers, the heat exchangers cool the hot air from each set of computer boards by transferring heat to a refrigerant (which is then pumped away) before that air contacts the next set of computer boards.
- In some exemplary embodiments, the cooling refrigerant used is a non-conductive, two-phase refrigerant which acts as an alternative cooling medium instead of water so that a coolant leak does not pose a risk of an electrical short or similar hazard. This type of refrigerant allows for better heat transfer capacity in the same space because of the use of micro channel coils and because the refrigerant absorbs a significant amount of heat as it evaporates. The use of a two-phase refrigerant allows the heat exchangers to operate essentially isothermally, which provides a uniform air temperature to the computer boards. The use of such a system also allows for a smaller “footprint” than if water or other single-phase fluids are used.
- The particular embodiments disclosed above are illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below.
Claims (29)
1-18. (canceled)
19. A enclosure for cooling heat generating objects, comprising:
at least a cabinet portion and a door portion, the enclosure having an air inlet and an air outlet;
at least one rack located in the cabinet portion for operatively connecting at least one heat generating object;
a fan associated with the enclosure for inducing air into the housing through the air inlet, establishing air flow within the housing and expelling air out of the housing through the air outlet;
an air-to-fluid heat exchanger located in the cabinet portion and in the air flow path between the air inlet and the heat generating object; and
whereby the air expelled from the housing is substantially the same temperature as the air entering the enclosure.
20. The enclosure of claim 19 , wherein the fan is situated adjacent the air outlet and outside of the housing.
21. The enclosure of claim 19 , wherein the fan is situated adjacent the air inlet and outside of the housing.
22. The enclosure of claim 19 , wherein the location of the fan is selected from the group consisting of: adjacent the air inlet and outside the housing; adjacent the air inlet and inside the housing; adjacent the air outlet and outside the housing; and adjacent the air outlet and inside the housing.
23. The enclosure of claim 19 , further comprising a second air-to-fluid heat exchanger located between the heat generating object and the air outlet.
24. The enclosure of claim 19 , wherein the air-to-fluid heat exchanger is a micro-channel heat exchanger.
25. The enclosure of claim 24 , wherein the heat exchanger is adapted to transfer heat from the air to a refrigerant.
26. The enclosure of claim 25 , wherein the refrigerant is a two-phase refrigerant.
27. The enclosure of claim 19 , further comprising a plurality of racks, each rack adapted to operatively connect a plurality of vertically-oriented heat generating objects to the rack.
28. The enclosure of claim 27 , further comprising at least one heat exchanger located between each rack.
29. The enclosure of claim 28 , wherein the at least one heat exchanger located between each rack is an air-to-fluid heat exchanger.
30. The enclosure of claim 29 , wherein the at least one heat exchanger located between each rack is a micro-channel heat exchanger.
31. The enclosure of claim 30 , wherein the at least one heat exchanger located between each rack is adapted to transfer heat from the air to a refrigerant.
32. The enclosure of claim 31 , wherein the refrigerant is a two-phase refrigerant.
33. A method for cooling heat generating objects located within an enclosure, comprising:
providing an enclosure comprising at least a cabinet portion and a door portion, the enclosure having an air inlet and an air outlet;
locating at least one rack within the cabinet portion for operatively connecting at least one heat generating object to the rack;
associating a fan with the enclosure to induce air into the housing through the air inlet;
placing an air-to-fluid heat exchanger in the cabinet portion and in an air flow path between the air inlet and the rack to transfer heat from the air;
establishing air flow through the heat exchanger and across the rack to transfer heat to the air; and
expelling air out of the housing through the air outlet at substantially the same temperature as the air entering the inlet.
34. The method of claim 33 , wherein associating the fan comprises locating the fan adjacent the air outlet and outside of the housing.
35. The method of claim 33 , wherein associating the fan comprises locating the fan adjacent the air inlet and outside of the housing.
36. The method of claim 33 , wherein associating the fan is selected from the group consisting of: adjacent the air inlet and outside the housing; adjacent the air inlet and inside the housing; adjacent the air outlet and outside the housing; and adjacent the air outlet and inside the housing.
37. The method of claim 33 , further comprising placing a second air-to-fluid heat exchanger between the rack and the air outlet.
38. The method of claim 33 , wherein the air-to-fluid heat exchanger is a micro-channel heat exchanger.
39. The method of claim 38 , wherein the heat exchanger is adapted to transfer heat from the air to a refrigerant.
40. The method of claim 39 , wherein the refrigerant is a two-phase refrigerant.
41. The method of claim 33 , further comprising locating a plurality of racks within the cabinet portion, each rack adapted to operatively connect a plurality of vertically oriented-heat generating objects to the rack.
42. The method of claim 41 , further comprising placing at least one heat exchanger between each rack.
43. The method of claim 42 , wherein the at least one heat exchanger between each rack is an air-to-fluid heat exchanger.
44. The method of claim 43 , wherein the at least one heat exchanger between each rack is a micro-channel heat exchanger.
45. The method of claim 44 , wherein the at least one heat exchanger located between each rack is adapted to transfer heat from air to a refrigerant.
46. The method of claim 45 , wherein the refrigerant is a two-phase refrigerant.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/052,599 US20080251240A1 (en) | 2004-11-14 | 2008-03-20 | Integrated heat exchangers in a rack for vertical board style computer systems |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US52285704P | 2004-11-14 | 2004-11-14 | |
US11/164,187 US7367384B2 (en) | 2004-11-14 | 2005-11-14 | Integrated heat exchangers in a rack for vertical board style computer systems |
US12/052,599 US20080251240A1 (en) | 2004-11-14 | 2008-03-20 | Integrated heat exchangers in a rack for vertical board style computer systems |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/164,187 Continuation US7367384B2 (en) | 2004-11-14 | 2005-11-14 | Integrated heat exchangers in a rack for vertical board style computer systems |
Publications (1)
Publication Number | Publication Date |
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US20080251240A1 true US20080251240A1 (en) | 2008-10-16 |
Family
ID=36023033
Family Applications (2)
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US11/164,187 Active 2026-04-05 US7367384B2 (en) | 2004-11-14 | 2005-11-14 | Integrated heat exchangers in a rack for vertical board style computer systems |
US12/052,599 Abandoned US20080251240A1 (en) | 2004-11-14 | 2008-03-20 | Integrated heat exchangers in a rack for vertical board style computer systems |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/164,187 Active 2026-04-05 US7367384B2 (en) | 2004-11-14 | 2005-11-14 | Integrated heat exchangers in a rack for vertical board style computer systems |
Country Status (5)
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US (2) | US7367384B2 (en) |
EP (1) | EP1810558B1 (en) |
JP (1) | JP4922943B2 (en) |
CN (1) | CN101044811A (en) |
WO (1) | WO2006055387A1 (en) |
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Also Published As
Publication number | Publication date |
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US7367384B2 (en) | 2008-05-06 |
WO2006055387A1 (en) | 2006-05-26 |
JP4922943B2 (en) | 2012-04-25 |
EP1810558B1 (en) | 2013-04-24 |
CN101044811A (en) | 2007-09-26 |
EP1810558A1 (en) | 2007-07-25 |
JP2008520104A (en) | 2008-06-12 |
US20060102322A1 (en) | 2006-05-18 |
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