US20150226449A1 - Ventilation device comprising a first outlet and a second outlet - Google Patents

Ventilation device comprising a first outlet and a second outlet Download PDF

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Publication number
US20150226449A1
US20150226449A1 US14/427,945 US201314427945A US2015226449A1 US 20150226449 A1 US20150226449 A1 US 20150226449A1 US 201314427945 A US201314427945 A US 201314427945A US 2015226449 A1 US2015226449 A1 US 2015226449A1
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United States
Prior art keywords
air
time
outlet
period
control
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
US14/427,945
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English (en)
Inventor
Per-Åke Larsson
Tomas Söderberg
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.)
Swegon Operations AB
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Swegon AB
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Filing date
Publication date
Application filed by Swegon AB filed Critical Swegon AB
Assigned to SWEGON AB reassignment SWEGON AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LARSSON, PER-AKE, SODERBERG, TOMAS
Publication of US20150226449A1 publication Critical patent/US20150226449A1/en
Assigned to SWEGON OPERATIONS AB reassignment SWEGON OPERATIONS AB CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SWEGON AB
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
    • F24F11/70—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
    • F24F11/755—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 cyclical variation of air flow rate or air velocity
    • 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
    • F24F11/04—
    • 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
    • F24F11/053—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
    • F24F3/0442—Systems in which all treatment is given in the central station, i.e. all-air systems with volume control at a constant temperature
    • F24F3/0444—Systems in which all treatment is given in the central station, i.e. all-air systems with volume control at a constant temperature in which two airstreams are conducted from the central station via independent conduits to the space to be treated, of which one has a constant volume and a season-adapted temperature, while the other one is always cold and varies in volume
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • F24F11/76—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 by means responsive to temperature, e.g. bimetal springs
    • 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
    • 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
    • F24F2110/10—Temperature
    • 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
    • F24F2110/20—Humidity
    • 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
    • F24F2110/50—Air quality properties
    • 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
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/70—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2120/00—Control inputs relating to users or occupants
    • F24F2120/10—Occupancy
    • F24F2120/12—Position of occupants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2120/00—Control inputs relating to users or occupants
    • F24F2120/10—Occupancy
    • F24F2120/14—Activity of occupants
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to a ventilation device comprising a first air duct for air supply and a second air duct for air supply.
  • the first air duct comprises a first outlet for air flow and the second air duct comprises a second outlet for air flow.
  • the first outlet is arranged to admit passage for a predefined amount of air per time unit.
  • the present invention also relates to a method for controlling air supply via a first outlet for air flow and a second outlet for air flow, where the first outlet admits passage for a predefined amount of air per time unit.
  • During ventilation fresh air is in many cases supplied via supply air diffusors, it may be one or more that are connected to a main pipe, where supplied fresh air is brought into motion towards the supply air diffusors via the main pipe by means of a fan arrangement. It is sometimes desirable to control the flow of supplied air in dependence of the present need. For example, a conference room may sometimes be empty, and sometimes be more or less occupied, such that different needs of air supply arise.
  • one or more detectors for temperature or motions may supply information regarding the present need of air supply to a control unit that in turn may control the fan arrangement in accordance with this need.
  • Control according to requirements for ventilation devices with a continuous ventilation flow does, however, require advanced technology to measure and to control. It may be problematic to optimize a ventilation product for both large and small flows; small flows are often difficult to measure.
  • the object of the present invention is to provide a ventilation device that is demand controlled, and which is of a less complicated nature than those that have been used until present.
  • a ventilation device comprising a first air duct for air supply and a second air duct for air supply.
  • the first air duct comprises a first outlet for air flow and the second air duct comprises a second outlet for air flow.
  • the first outlet is arranged to admit passage for a predefined amount of air per time unit.
  • the second outlet comprises a controllable choke device that is arranged to either take a first position that admits passage for a predefined amount of air per time unit or a second position that does not admit passage of air.
  • the ventilation device comprises a control unit and at least one detector, where the control unit is arranged to control the controllable choke device in dependence of input data from said detector such that demand controlled ventilation is obtained.
  • Said object is also achieved by means of a method for controlling air supply via a first outlet for air flow and a second outlet for air flow, where the first outlet admits passage for a predefined amount of air per time unit.
  • the method comprises the steps: detecting at least one parameter in a space, where said parameter is related to the air quality in the space; and controlling a choke device at the second outlet in dependence of said detection such that the choke device either takes a first position that admits passage for a predefined amount of air per time unit, or a second position that does not admit passage of air, such that demand controlled ventilation is obtained.
  • each detector is arranged to detect at least one of temperature, air humidity, carbon dioxide content, motions and presence.
  • control unit is arranged to control the choke device to shift between the first position and the second position with a periodicity such that the first position is taken during a first period of time and the second position is taken during a second period of time, such that a pulsating air flow is acquired at the second outlet.
  • FIG. 1 shows a schematic overview of a ventilation device
  • FIG. 2 shows a first graph for air flow versus time
  • FIG. 3 shows a second graph for air flow versus time
  • FIG. 4 shows a third graph for air flow versus time
  • FIG. 5 shows a fourth graph for air flow versus time
  • FIG. 6 shows a fifth graph for air flow versus time
  • FIG. 7 shows a sixth graph for air flow versus time
  • FIG. 8 shows a flow chart for a method according to the present invention.
  • FIG. 1 shows a ventilation device 1 that comprises a fan arrangement 15 arranged to bring fresh air into motion, from an inlet 10 to a main duct 11 , and further from the main duct 11 to a first air duct 2 and a second air duct 3 via a ramification 12 .
  • the first air duct 2 comprises a first outlet 4 for air flow and the second air duct 3 comprises a second outlet 5 for air flow, where each outlet 4 , 5 comprises a plurality of outlet apertures 13 , 14 .
  • the first outlet 4 is arranged to admit passage for a predefined amount of air per time unit F 1 .
  • the second outlet 5 comprises a controllable choke device 6 that is arranged to either take a first position that admits passage for a predefined amount of air per time unit F 3 or a second position that does not admit passage of air, where the first graph 16 shows a state where the choke device has taken the second position.
  • the ventilation device comprises a control unit 7 , a first detector 8 and a second detector 9 , where the control unit 7 is arranged to control the controllable choke device 6 in dependence of input data from these detectors 8 , 9 such that demand controlled ventilation is obtained.
  • each detector 8 , 9 is arranged to detect at least one of temperature, air humidity, motions, presence and air quality, such as carbon dioxide content.
  • the detectors are thus of an adapted kind, for example a detector that is arranged to detect motions and/or presence in a previously known manner may comprise a sensor for infrared radiation. It is also conceivable that more sophisticated detectors are used, for example camera arrangements that are adapted to detect the number of persons in a room. At least indirectly, all detected parameters are related to air quality, since for example a temperature rise, an elevated air humidity, motions and presence indicate the presence of one or more persons which is directly related to air quality.
  • the choke device 6 is controlled to take the second position, which is illustrated in FIG. 2 . Then a desired base ventilation is obtained in order to acquire a certain indoor climate.
  • a second graph for air flow versus time is shown in FIG. 3 when the detectors 8 , 9 have detected that persons have entered a room. This may for example be made by means of detection of movements and/or presence, an/or also indirectly by detecting an elevated carbon dioxide content, which in turn indicates a deteriorated air quality. Then the choke device 6 is controlled by the control device 7 to shift between the first position and the second position with a periodicity T ⁇ such that the first position is taken during a first period of time T 1A and the second position is taken during a second period of time T 2A such that a pulsating air flow is obtained at the second outlet 5 .
  • the total maximum flow per time unit F 2 is obtained when the second position is taken and corresponds to the sum of the flows F 1 , F 3 via the outlets 4 , 5 .
  • the choke device 6 is controlled by the control unit 7 such that the first period of time T 1A is maintained constant while the second period of time is decreased from a first value T 2A to a second value T 2B such that the period of the periodicity is decreased from a first period value T ⁇ to a second period value T ⁇ .
  • the time during which the choke device 6 is controlled to take the first position is increased, resulting in an increased air flow.
  • the first position is generally taken during constant periods of time T 1A and the second position during controllably variable periods of time T 2A , T 2B , such that a controllable periodicity T ⁇ , T ⁇ for the first position is obtained.
  • a controllable periodicity T ⁇ , T ⁇ for the first position is obtained.
  • FIG. 5 shows a fourth graph 19 for airflow versus time
  • the control unit 7 is instead arranged to control the choke device 6 such that the first period of time is increased from a first value T 1A to a second value T 1C while the second period of time is correspondingly decreased from a first value T 2A to a second value T 2C .
  • the time during which the choke device 6 is controlled to take the first position is increased, resulting in an increased air flow.
  • the first position is taken during controllably variable periods of time T 1A , T 1A with a constant periodicity T ⁇ .
  • both the first period of time has been changed from a first value T 1A to a second value T 1C and the second period of time has been changed from a first value T 2A to a second value T 2C .
  • the period of the periodicity has been changed from a first value T ⁇ to a second value T A .
  • the first period of time can either be increased or decreased, and the second period of time can also either be increased or decreased, independently of each other.
  • the choke device 6 may be controlled to take the first position during a longer time, which is indicated in FIG. 7 , shows a sixth graph 21 for airflow versus time.
  • the periods are controlled such that too long or too short time intervals are avoided, for example the device may be controlled such that intervals shorter than 1 minute or longer than 10 minutes are avoided except in those cases where the control provides a signal indicating that it should be completely open or completely closed.
  • the present invention also relates to a method for controlling air supply via a first outlet 4 for air flow and a second outlet 5 for air flow, where the first outlet 4 admits passage for a predefined amount of air per time unit F 1 .
  • the method comprises the steps:
  • the present invention is not limited to the above, but may vary freely within the scope of the appended claims.
  • the first outlet and the second outlet form an outlet pair 22 , and it is conceivable that the main duct comprises more ramifications that lead to further outlet pairs of the same type.
  • Such outlet pairs may be present in the same room or different rooms, and in the latter case it is desirable to have detectors in all current rooms.
  • a number of outlet pairs may also be integrated as one and the same supply air diffusor, for example in the form of a so-called cooling baffle.
  • the number of detectors in each room, and their different types and functions may vary, but according to the present invention there shall be at least one detector.
  • Fan arrangements, air ducts and chokes are of a well-known kind, and are not further described here.
  • dP is the pressure difference between duct and surroundings.
  • the control unit 7 is arranged to control the controllable choke device 6 in dependence of input data from said detector 8 , 9 , and it is also conceivable that time control may be used as a complement. For example, knowledge about that a room is going to be used at a certain time may be used to increase the ventilation a certain time period before that time. In this case, the time control works as a kind of indirect presence detection, and thus the unit that regulates the time control can be regarded as a kind of detector within the scope of the present invention. The detected parameter in that case is time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Ventilation (AREA)
  • Air Conditioning Control Device (AREA)
US14/427,945 2012-09-17 2013-09-17 Ventilation device comprising a first outlet and a second outlet Abandoned US20150226449A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1251036A SE537032C2 (sv) 2012-09-17 2012-09-17 Ventilationsanordning innefattande ett första utlopp och ettandra utlopp
SE1251036-8 2012-09-17
PCT/SE2013/051085 WO2014042588A1 (en) 2012-09-17 2013-09-17 Ventilation device comprising a first outlet and a second outlet

Publications (1)

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US20150226449A1 true US20150226449A1 (en) 2015-08-13

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US14/427,945 Abandoned US20150226449A1 (en) 2012-09-17 2013-09-17 Ventilation device comprising a first outlet and a second outlet

Country Status (4)

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US (1) US20150226449A1 (de)
EP (1) EP2909540B1 (de)
SE (1) SE537032C2 (de)
WO (1) WO2014042588A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150247648A1 (en) * 2012-09-17 2015-09-03 Swegon Ab Slide valve for a ventilation device
US20210318018A1 (en) * 2018-09-03 2021-10-14 Daikin Industries, Ltd. Air flow control apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108332374B (zh) * 2018-01-30 2021-06-18 广东美的制冷设备有限公司 空调器及其新风控制方法、装置

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US3680776A (en) * 1970-12-28 1972-08-01 Fluidtech Corp Fluidic apparatus for air-conditioning systems
US3738572A (en) * 1967-05-08 1973-06-12 W Hall Air flow control system
US3967780A (en) * 1972-12-01 1976-07-06 Carrier Corporation Air conditioning system
US4013118A (en) * 1974-05-16 1977-03-22 Barber-Colman Company Control of heating and cooling available from central sources to a multi-zone temperature controlled space
US4489881A (en) * 1984-01-30 1984-12-25 Tempmaster Corporation Air delivery system for hospital rooms and the like
US4928750A (en) * 1988-10-14 1990-05-29 American Standard Inc. VaV valve with PWM hot water coil
US20040007627A1 (en) * 2002-05-17 2004-01-15 Airfixture L.L.C. Method and apparatus for delivering conditioned air using pulse modulation
US20060076425A1 (en) * 2002-05-17 2006-04-13 Airfixture L.L.C. Method and apparatus for delivering conditioned air using dual plenums
EP1843106A2 (de) * 2006-04-03 2007-10-10 Callenberg Fläkt Marine AB Vorrichtung und Verfahren zur Luftstromregelung
US20090047894A1 (en) * 2007-08-17 2009-02-19 Siemens Building Technologies, Inc. Pressure control with coarse and fine adjustment
US20090266903A1 (en) * 2008-04-29 2009-10-29 Airgonomix, Llc Damper to control fluid flow and associated methods
US20120122388A1 (en) * 2009-07-08 2012-05-17 Nobuki Matsui Ventilation system
US20120145802A1 (en) * 2004-01-07 2012-06-14 Honeywell International Inc. Intelligent circulation control methods and systems

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US2609743A (en) * 1947-01-16 1952-09-09 Carrier Corp Dual duct air conditioning system
SE383920B (sv) * 1973-10-02 1976-04-05 Svenska Flaektfabriken Ab Forfarande for luftkonditionering av ett antal lokaler med sinsemellan olika vermebehov
US6296193B1 (en) * 1999-09-30 2001-10-02 Johnson Controls Technology Co. Controller for operating a dual duct variable air volume terminal unit of an environmental control system

Patent Citations (14)

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Publication number Priority date Publication date Assignee Title
US3194304A (en) * 1961-12-20 1965-07-13 Titus Mfg Corp Variable volume terminal unit with reheat
US3738572A (en) * 1967-05-08 1973-06-12 W Hall Air flow control system
US3680776A (en) * 1970-12-28 1972-08-01 Fluidtech Corp Fluidic apparatus for air-conditioning systems
US3967780A (en) * 1972-12-01 1976-07-06 Carrier Corporation Air conditioning system
US4013118A (en) * 1974-05-16 1977-03-22 Barber-Colman Company Control of heating and cooling available from central sources to a multi-zone temperature controlled space
US4489881A (en) * 1984-01-30 1984-12-25 Tempmaster Corporation Air delivery system for hospital rooms and the like
US4928750A (en) * 1988-10-14 1990-05-29 American Standard Inc. VaV valve with PWM hot water coil
US20040007627A1 (en) * 2002-05-17 2004-01-15 Airfixture L.L.C. Method and apparatus for delivering conditioned air using pulse modulation
US20060076425A1 (en) * 2002-05-17 2006-04-13 Airfixture L.L.C. Method and apparatus for delivering conditioned air using dual plenums
US20120145802A1 (en) * 2004-01-07 2012-06-14 Honeywell International Inc. Intelligent circulation control methods and systems
EP1843106A2 (de) * 2006-04-03 2007-10-10 Callenberg Fläkt Marine AB Vorrichtung und Verfahren zur Luftstromregelung
US20090047894A1 (en) * 2007-08-17 2009-02-19 Siemens Building Technologies, Inc. Pressure control with coarse and fine adjustment
US20090266903A1 (en) * 2008-04-29 2009-10-29 Airgonomix, Llc Damper to control fluid flow and associated methods
US20120122388A1 (en) * 2009-07-08 2012-05-17 Nobuki Matsui Ventilation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150247648A1 (en) * 2012-09-17 2015-09-03 Swegon Ab Slide valve for a ventilation device
US20210318018A1 (en) * 2018-09-03 2021-10-14 Daikin Industries, Ltd. Air flow control apparatus
US12061006B2 (en) * 2018-09-03 2024-08-13 Daikin Industries, Ltd. Air flow control apparatus

Also Published As

Publication number Publication date
SE537032C2 (sv) 2014-12-09
EP2909540B1 (de) 2017-11-29
EP2909540A1 (de) 2015-08-26
SE1251036A1 (sv) 2014-03-18
EP2909540A4 (de) 2016-07-27
WO2014042588A1 (en) 2014-03-20

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