US20090277622A1 - Air flow controller for electrical equipment holder - Google Patents

Air flow controller for electrical equipment holder Download PDF

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Publication number
US20090277622A1
US20090277622A1 US12/463,173 US46317309A US2009277622A1 US 20090277622 A1 US20090277622 A1 US 20090277622A1 US 46317309 A US46317309 A US 46317309A US 2009277622 A1 US2009277622 A1 US 2009277622A1
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US
United States
Prior art keywords
equipment
enclosure
fan
pressure
equipment enclosure
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
Application number
US12/463,173
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English (en)
Inventor
Rajesh M. Nair
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Degree Controls Inc
Original Assignee
Degree Controls Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Degree Controls Inc filed Critical Degree Controls Inc
Priority to US12/463,173 priority Critical patent/US20090277622A1/en
Assigned to DEGREE CONTROLS, INC. reassignment DEGREE CONTROLS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAIR, RAJESH M.
Publication of US20090277622A1 publication Critical patent/US20090277622A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/0001—Control or safety arrangements for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/75—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity for maintaining constant air flow rate or air velocity
    • 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
    • H05K7/20836—Thermal management, e.g. server temperature control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/30—Velocity

Definitions

  • Airflow capacity of the fans may be designed to cool the component or device in an open environment.
  • equipment holders such as racks with front and back panels. Placing the equipment or components in such holders may create an environment where the fans in the individual components and devices do not provide adequate ventilation.
  • temperature within the enclosure is measured, and used to control a fan that evacuates air from the enclosure to maintain a desired temperature range within the enclosure. Airflow may also be measured and controlled in further prior devices.
  • FIG. 1 is a block diagram of a system for controlling airflow as a function of differential pressure in an equipment enclosure according to an example embodiment.
  • FIG. 2 is a block schematic diagram of an alternative system for controlling airflow according to an example embodiment.
  • FIG. 3 is a block schematic diagram of an alternative system for controlling airflow according to an example embodiment.
  • FIG. 4 is a block schematic diagram of an alternative system for controlling airflow according to an example embodiment.
  • FIG. 5 is a block schematic diagram of computer system operable as a controller according to an example embodiment.
  • FIG. 6 is a block schematic diagram of an alternative system for controlling airflow according to an example embodiment.
  • FIG. 7 is a block schematic diagram of a further alternative system for controlling airflow according to an example embodiment.
  • the functions or algorithms described herein may be implemented in software or a combination of software and human implemented procedures in one embodiment.
  • the software may consist of computer executable instructions stored on computer readable media such as memory or other type of storage devices. Further, such functions correspond to modules, which are software, hardware, firmware or any combination thereof. Multiple functions may be performed in one or more modules as desired, and the embodiments described are merely examples.
  • the software may be executed on a digital signal processor, ASIC, microprocessor, or other type of processor operating on a computer system, such as a personal computer, server or other computer system.
  • a system 100 includes an equipment enclosure 110 .
  • Equipment enclosure 110 may have supports 115 for supporting one more pieces of equipment 120 .
  • the supported equipment may be referred to as a rack of equipment.
  • One or more of such pieces of equipment may have a fan for cooling itself.
  • a differential pressure sensor 125 is supported by the enclosure 110 , and is operable to sense a first pressure at a first side 130 of the rack in equipment enclosure 110 and a second pressure at a second side 135 of the rack in equipment enclosure 110 .
  • the differential pressure sensor may provide a signal representing a difference between the first and second pressure.
  • wireless absolute pressure sensors 140 , 141 are used to sense the first and second pressures.
  • a fan 145 is supported by the equipment enclosure 110 and is operable to remove air from the second side 135 of the equipment enclosure 110 .
  • a controller 150 is coupled to the fan 145 and receives the signal from the differential pressure sensor 125 or sensors 140 , 141 , or both. Controller 150 controls the fan about a differential pressure set point, such as zero in one embodiment to provide an environment for the equipment 120 that is similar to that for which it is designed, such as where equipment 120 is free standing and not supported within an equipment enclosure.
  • controller 150 may be a PID controller, controlling the fan to keep the differential pressure about a predetermined or pre selected set point, such as zero in one embodiment.
  • Other set points may be used, to create a decrease in pressure if desired to allow cooling mechanisms in the equipment to operate at reduced levels or just provide more effective cooling.
  • a range of set points may also be utilized to control the difference in pressure, such as plus or minus 0.1 atmospheres about a set point which may be zero in one embodiment.
  • the first side 130 of the equipment enclosure 110 corresponds to front side of the equipment enclosure 110 and the second side 135 of the equipment enclosure corresponds to a back side of the equipment enclosure 110 .
  • the front side is an air intake side
  • the back side is and air exhaust side.
  • the pieces of equipment 120 may be supported within the enclosure such that air moves through them generally from the front of the enclosure to the back of the enclosure.
  • different pieces of equipment 120 may be mounted such that their airflow direction alternates at adjacent pieces of equipment 120 , or may be mounted without regard to their airflow direction.
  • only one side of the equipment rack may be enclosed. The pressure difference may then be measured between the side of the equipment rack that is enclosed, and the side that is not. Air may be exhausted or provided to the enclosure in some embodiments.
  • FIG. 2 is a block schematic diagram illustrating an alternative pressure sensing arrangement. The numbering is consistent with FIG. 1 .
  • pressure sensor 125 is a capacitive differential pressure sensor, with a first pressure from a tube 210 having an opening 215 providing a pressure from the first side 130 of enclosure 110 .
  • a second pressure is provided by a second tube 220 having an opening 225 proximate the second side 135 of enclosure 110 .
  • the tubes may be supported many different ways within the enclosure, or even on the outside of the enclosure if desired.
  • the openings 215 and 225 may be placed to conduct the pressures corresponding closest to the pressures encountered by the equipment 120 to either side of a capacitive diaphragm within the pressure sensor 125 . In some embodiments, the openings are not placed in areas of high air velocity, as such a placement could affect the pressure encountered. In further embodiments, any type of differential pressure sensor may be used.
  • FIG. 3 is a block schematic diagram illustrating a further embodiment 300 where the pressure sensor 125 is provided an average pressure from multiple openings 310 , 315 , 320 about the first side 130 of the enclosure 110 , and from multiple openings 325 , 330 , 335 about the second side 125 of the enclosure 110 .
  • pressure readings are somewhat averaged by the connection of multiple tubes to the differential pressure sensor 125 .
  • the tubes are shown as connecting at some distance from the differential pressure sensor 125 , which may not result in a true average of the pressure.
  • completely separate tubes joining at the differential pressure sensor 125 may be used to obtain an even closer average of the pressures.
  • FIG. 4 is a block schematic diagram illustrating a further embodiment 400 , where multiple fans 410 , 415 , 420 are used with independent pressure measurements.
  • a combined differential pressure sensor and controller 425 , 430 and 435 are used to control each corresponding fan.
  • Differential pressure sensor and controller 425 has tubes 440 and 442 positioned to provide differential pressure from the first side 130 and second side 135 proximate one piece of equipment 444 .
  • Fan 410 is then controlled by controller 425 based on differential pressure between first and second side of equipment 444 .
  • Fan 410 is positioned adjacent equipment 444 in order to more directly lower pressure at the second side of equipment 444 , and have less effect regarding other equipment in the enclosure.
  • differential pressure sensor and controller 430 has tubes 450 and 452 positioned to provide differential pressure from the first side 130 and second side 135 proximate one piece of equipment 454 .
  • Fan 415 is then controlled by controller 430 based on differential pressure between first and second side of equipment 454 .
  • Fan 415 is positioned adjacent equipment 454 in order to more directly lower pressure at the second side of equipment 454 , and have less effect regarding other equipment in the enclosure.
  • differential pressure sensor and controller 435 has tubes 460 and 462 positioned to provide differential pressure from the first side 130 and second side 135 proximate one piece of equipment 464 .
  • Fan 420 is then controlled by controller 435 based on differential pressure between first and second side of equipment 464 .
  • Fan 420 is positioned adjacent equipment 464 in order to more directly lower pressure at the second side of equipment 464 , and have less effect regarding other equipment in the enclosure.
  • Further fans and controllers may be provided for additional equipment.
  • two fans and controllers may be used for multiple pieces of equipment without a one to one correspondence. The multiple fans may be controlled as a function of one or more differential pressure measurements.
  • the controller may be a general programmed computing device as shown in FIG. 5 or a dedicated controller implementing one or more forms of PID control or other control as desired to operate the fans to a desired set point.
  • a computer 510 may include a processing unit 502 , memory 504 , removable storage 512 , and non-removable storage 514 .
  • Memory 504 may include volatile memory 506 and non-volatile memory 508 .
  • Computer 510 may include—or have access to a computing environment that includes—a variety of computer-readable media, such as volatile memory 506 and non-volatile memory 508 , removable storage 512 and non-removable storage 514 .
  • Computer storage includes random access memory (RAM), read only memory (ROM), erasable programmable read-only memory (EPROM) & electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD ROM), Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other physical medium capable of storing computer-readable instructions.
  • Computer 510 may include or have access to a computing environment that includes input 516 , output 518 , and a communication connection 520 .
  • the computer may operate in a networked environment using a communication connection to connect to one or more remote computers.
  • the remote computer may include a personal computer (PC), server, router, network PC, a peer device or other common network node, or the like.
  • the communication connection may include a Local Area Network (LAN), a Wide Area Network (WAN) or other networks.
  • LAN Local Area Network
  • WAN Wide Area Network
  • Computer-readable instructions stored on a computer-readable medium are executable by the processing unit 502 of the computer 510 .
  • a hard drive, CD-ROM, and RAM are some examples of articles including a computer-readable medium.
  • many of the above components may not be needed, and the controller may be implemented without storage devices and various other components not needed to control a fan.
  • FIG. 6 A block schematic diagram of a further embodiment is shown in FIG. 6 generally at 600 . Electrical equivalent of airflow and pressure in a frame is shown where equipment pressure difference is controlled to a zero point at 610 .
  • An internal fan 620 referred to as Fan_Eqpt is the internal fan for a piece of equipment that is designed to offer adequate airflow at zero pressure difference.
  • equipment may be supported within one or more rows of racks. Two such rows of racks 710 , 715 are shown in FIG. 7 supported by a raised floor 720 .
  • a closed aisle 725 is formed between the racks 710 and 715 by including a top 730 and sides, one of which is visible at 735 .
  • a fan assisted floor tile 740 contains multiple fans that provide cooling air to the rows of racks from the floor. Without the fans, airflow through the equipment in the racks may be severely reduced due to a high effective flow impedance of the racks.
  • the fan assisted floor tile is located in the raised floor 720 and disposed directly between the rows of racks 710 , 715 to provide airflow through a grate in the floor.
  • a differential pressure sensor 745 is disposed to sense a difference in pressure between the rows of racks in the aisle 715 and ambient, where equipment may exhaust air.
  • the pressure sensor 745 is coupled to a controller 750 , which in turn is coupled to control the fan assisted floor tile 740 to provide a desired difference in pressure as described above.
  • the difference in pressure from one side of a rack and another side of the rack is sensed and used to control fans providing cooling airflow to the enclosure.
  • a first side of the rack corresponds to the aisle, or an equipment enclosure, while a second side of the rack is outside the enclosure.
  • only one rack is provided, with the second rack replaced with a wall to provide enclosure of the aisle.
  • closed aisle 725 is a cold aisle.
  • closed aisle 725 may be a hot aisle, with the fan assisted floor tile 740 disposed on the top 735 of the aisle, and pulling hot air form the aisle out of the aisle. No raised floor is needed in this embodiment, and cool air from outside the racks may be drawn in through the racks to cool them.
  • the pressure sensing and fan control may be controlled in a similar manner as a function of the difference in pressure.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Computer Hardware Design (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
US12/463,173 2008-05-09 2009-05-08 Air flow controller for electrical equipment holder Abandoned US20090277622A1 (en)

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Application Number Priority Date Filing Date Title
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US5195208P 2008-05-09 2008-05-09
US12/463,173 US20090277622A1 (en) 2008-05-09 2009-05-08 Air flow controller for electrical equipment holder

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011001182A1 (en) * 2009-07-02 2011-01-06 It Cooling Systems Ltd Cooling system
WO2011019337A1 (en) * 2009-08-11 2011-02-17 Hewlett-Packard Development Company, L.P. Enclosure airflow controller
WO2012025112A1 (de) 2010-08-27 2012-03-01 Correct Power Institute Gmbh Klimatisierungssystem und klimatisierungsverfahren
US20120164930A1 (en) * 2010-11-02 2012-06-28 Dai Murayama Server room managing air conditioning system and air conditioning control method
WO2012091868A1 (en) 2010-12-30 2012-07-05 American Power Conversion Corporation System and method for air containment zone air leakage detection
US8407004B2 (en) 2010-04-29 2013-03-26 Schneider Electric It Corporation Airflow detector and method of measuring airflow
US20140092549A1 (en) * 2012-09-28 2014-04-03 Fujitsu Limited Container-type data center and air-conditioning control method
US20150003010A1 (en) * 2013-06-28 2015-01-01 Silicon Graphics International Corp. Pressure-activated server cooling system
US20180054917A1 (en) * 2016-08-22 2018-02-22 Asia Vital Components Co., Ltd. Heat dissipation system with air sensation function
US9943011B2 (en) 2014-09-10 2018-04-10 Panduit Corp. Cooling control for data centers with cold aisle containment systems
US20190033897A1 (en) * 2017-07-28 2019-01-31 Stmicroelectronics, Inc. Air flow measurement using pressure sensors
US10375864B2 (en) 2017-08-07 2019-08-06 Panduit Corp. Airflow control in data centers utilizing hot aisle containment
JP2020149256A (ja) * 2019-03-13 2020-09-17 株式会社東芝 異常検出装置、異常検出方法、およびプログラム
US11754083B2 (en) * 2015-10-02 2023-09-12 Ziehl-Abegg Se Motor for fans or blowers, pumps or compressors, method for operating such a motor and blower system having one or more motor(s)/blower(s)

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US6222729B1 (en) * 1998-07-28 2001-04-24 Nec Corporation Electronic device cooling system having guides for guiding a flow of the air evenly
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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011001182A1 (en) * 2009-07-02 2011-01-06 It Cooling Systems Ltd Cooling system
WO2011019337A1 (en) * 2009-08-11 2011-02-17 Hewlett-Packard Development Company, L.P. Enclosure airflow controller
US20120123597A1 (en) * 2009-08-11 2012-05-17 Darren Cepulis Enclosure airflow controller
US9354678B2 (en) * 2009-08-11 2016-05-31 Hewlett Packard Enterprise Development Lp Enclosure airflow controller
US8407004B2 (en) 2010-04-29 2013-03-26 Schneider Electric It Corporation Airflow detector and method of measuring airflow
WO2012025112A1 (de) 2010-08-27 2012-03-01 Correct Power Institute Gmbh Klimatisierungssystem und klimatisierungsverfahren
US9237680B2 (en) * 2010-11-02 2016-01-12 Kabushiki Kaisha Toshiba Server room managing air conditioning system and air conditioning control method
US20120164930A1 (en) * 2010-11-02 2012-06-28 Dai Murayama Server room managing air conditioning system and air conditioning control method
US9274019B2 (en) 2010-12-30 2016-03-01 Schneider Electric It Corporation System and method for air containment zone air leakage detection
CN103348781A (zh) * 2010-12-30 2013-10-09 施耐德电气It公司 用于空气密封区的空气泄漏检测的系统和方法
US8534119B2 (en) 2010-12-30 2013-09-17 Schneider Electric It Corporation System and method for air containment zone air leakage detection
WO2012091868A1 (en) 2010-12-30 2012-07-05 American Power Conversion Corporation System and method for air containment zone air leakage detection
AU2011352965B2 (en) * 2010-12-30 2017-02-16 Schneider Electric It Corporation System and method for air containment zone air leakage detection
AU2011352965A8 (en) * 2010-12-30 2017-03-02 Schneider Electric It Corporation System and method for air containment zone air leakage detection
US9420726B2 (en) * 2012-09-28 2016-08-16 Fujitsu Limited Container-type data center and air-conditioning control method
US20140092549A1 (en) * 2012-09-28 2014-04-03 Fujitsu Limited Container-type data center and air-conditioning control method
US20150003010A1 (en) * 2013-06-28 2015-01-01 Silicon Graphics International Corp. Pressure-activated server cooling system
US9943011B2 (en) 2014-09-10 2018-04-10 Panduit Corp. Cooling control for data centers with cold aisle containment systems
US11754083B2 (en) * 2015-10-02 2023-09-12 Ziehl-Abegg Se Motor for fans or blowers, pumps or compressors, method for operating such a motor and blower system having one or more motor(s)/blower(s)
US20180054917A1 (en) * 2016-08-22 2018-02-22 Asia Vital Components Co., Ltd. Heat dissipation system with air sensation function
US10537041B2 (en) * 2016-08-22 2020-01-14 Asia Vital Components Co., Ltd. Heat dissipation system with air sensation function
US10824175B2 (en) * 2017-07-28 2020-11-03 Stmicroelectronics, Inc. Air flow measurement using pressure sensors
US20190033897A1 (en) * 2017-07-28 2019-01-31 Stmicroelectronics, Inc. Air flow measurement using pressure sensors
US10375864B2 (en) 2017-08-07 2019-08-06 Panduit Corp. Airflow control in data centers utilizing hot aisle containment
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