US20150226449A1 - Ventilation device comprising a first outlet and a second outlet - Google Patents
Ventilation device comprising a first outlet and a second outlet Download PDFInfo
- 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
- Authority
- US
- 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
Links
Images
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.
Landscapes
- 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)
Abstract
The present invention relates to a ventilation device (1) comprising a first air duct (2) for air supply and a second air duct (3) for air supply. 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 the first outlet (4) is arranged to admit passage for a predefined amount of air per time unit (F-i). 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 (F3) or a second position that does not admit passage of air. The ventilation device (1) comprises a control unit (7) and at least one detector (8, 9), where the control unit (7) is arranged to control the controllable choke device (6) in dependence of input data from said detector (8, 9) such that demand controlled ventilation is obtained.
Description
- 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.
- For example, 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.
- There is therefore a desire for a ventilation device that is demand controlled, and which lacks the above disadvantages.
- 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.
- Said object is achieved by means of 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.
- According to an example each detector is arranged to detect at least one of temperature, air humidity, carbon dioxide content, motions and presence.
- According to another example, the 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.
- Other examples are apparent from the dependent claims.
- A number of advantages are obtained by means of the present invention, for example:
-
- The ventilation device better optimized for the flow which among other things relates to bring along re-circulated air in a more controlled manner as well as for lowering or avoiding noise or jarring ate certain flow velocities.
- Few movable parts.
- Uncomplicated software control, easily adjustable.
- Increased life span.
- Energy efficient.
- The present invention will now be described more in detail with reference to the appended drawings, where:
-
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; and -
FIG. 8 shows a flow chart for a method according to the present invention. -
FIG. 1 shows aventilation device 1 that comprises afan arrangement 15 arranged to bring fresh air into motion, from aninlet 10 to amain duct 11, and further from themain duct 11 to afirst air duct 2 and asecond air duct 3 via aramification 12. Thefirst air duct 2 comprises afirst outlet 4 for air flow and thesecond air duct 3 comprises asecond outlet 5 for air flow, where eachoutlet outlet apertures - With reference also to
FIG. 2 , showing afirst graph 16 for air flow versus time, thefirst outlet 4 is arranged to admit passage for a predefined amount of air per time unit F1. - According to the present invention the
second outlet 5 comprises acontrollable choke device 6 that is arranged to either take a first position that admits passage for a predefined amount of air per time unit F3 or a second position that does not admit passage of air, where thefirst graph 16 shows a state where the choke device has taken the second position. - The ventilation device comprises a
control unit 7, afirst detector 8 and asecond detector 9, where thecontrol unit 7 is arranged to control thecontrollable choke device 6 in dependence of input data from thesedetectors detector - For example, when the
detectors choke device 6 is controlled to take the second position, which is illustrated inFIG. 2 . Then a desired base ventilation is obtained in order to acquire a certain indoor climate. - With reference to
FIG. 1 andFIG. 3 , a second graph for air flow versus time is shown inFIG. 3 when thedetectors choke device 6 is controlled by thecontrol device 7 to shift between the first position and the second position with a periodicity Tα such that the first position is taken during a first period of time T1A and the second position is taken during a second period of time T2A such that a pulsating air flow is obtained at thesecond outlet 5. The period Tα of this periodicity corresponds to the sum of the first period of time T1A and the second period of time T2A, that is Tα=T1A+T2A. The total maximum flow per time unit F2 is obtained when the second position is taken and corresponds to the sum of the flows F1, F3 via theoutlets - According to a first example, with reference also to
FIG. 4 that shows a fourth graph for airflow versus time, if thedetectors choke device 6 is controlled by thecontrol unit 7 such that the first period of time T1A is maintained constant while the second period of time is decreased from a first value T2A to a second value T2B such that the period of the periodicity is decreased from a first period value Tα to a second period value Tβ. In this way, the time during which thechoke device 6 is controlled to take the first position is increased, resulting in an increased air flow. - In this example, the first position is generally taken during constant periods of time T1A and the second position during controllably variable periods of time T2A, T2B, such that a controllable periodicity Tα, Tβ for the first position is obtained. In this way, only the time interval T2A, T2B when the second position is taken is changed, that is when no air passage is admitted at the
second outlet 5, but no other parameters. - According to a second example, with reference to
FIG. 1 ,FIG. 3 andFIG. 5 , whereFIG. 5 shows afourth graph 19 for airflow versus time, if thedetectors control unit 7 is instead arranged to control thechoke device 6 such that the first period of time is increased from a first value T1A to a second value T1C while the second period of time is correspondingly decreased from a first value T2A to a second value T2C. In this way, the time during which thechoke device 6 is controlled to take the first position is increased, resulting in an increased air flow. - Generally, the first position is taken during controllably variable periods of time T1A, T1A with a constant periodicity Tα.
- According to a third example, with reference also to
FIG. 6 , whereFIG. 6 shows afifth graph 20 for airflow versus time, both the first period of time has been changed from a first value T1A to a second value T1C and the second period of time has been changed from a first value T2A to a second value T2C. Then the period of the periodicity has been changed from a first value Tα to a second value TA. - According to the third example, 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.
- All kinds of changes of pulse widths or pulse lengths in all conceivable combinations may occur according to the present invention. Naturally, where appropriate, the
choke device 6 may be controlled to take the first position during a longer time, which is indicated inFIG. 7 , shows asixth graph 21 for airflow versus time. - Suitably, 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.
- With reference to
FIG. 8 , the present invention also relates to a method for controlling air supply via afirst outlet 4 for air flow and asecond outlet 5 for air flow, where thefirst outlet 4 admits passage for a predefined amount of air per time unit F1. - The method comprises the steps:
-
- 23: detecting at least one parameter in a space, where said parameter is related to the air quality in the space; and
- 24: controlling a
choke device 6 at thesecond outlet 5 in dependence of said detection such that thechoke device 6 either takes a first position that admits passage for a predefined amount of air per time unit F3, or a second position that does not admit passage of air. In this way, demand controlled ventilation is obtained.
- The present invention is not limited to the above, but may vary freely within the scope of the appended claims. For example, 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.
- When it is stated that no air passage is admitted, this should be interpreted as being within what is practically obtainable in this field of technology; a certain amount of leakage may therefore occur. Furthermore, the air flows are graphically shown with sharp borders; practically there are softer transitions between different positions where the different air flows may vary somewhat over time due to leakage, wear, clogging of filters and other sources of error. The graphical representations should therefore be regarded as schematical description of the present invention, and not as exact representations of reality.
- At a ventilation device of this kind, a constant pressure in the air ducts is desired. By also having knowledge about the characteristics of the
outlets adherent outlet apertures outlets -
Q=k√{square root over (dP)} - where dP is the pressure difference between duct and surroundings.
- When the duct pressure is varied, a software-implemented compensation of the flow may then be performed by changing the length of the periods. By means of this knowledge of the characteristics of the outlets and the current duct pressure, flow measurement with special sensors may be avoided.
- The
control unit 7 is arranged to control thecontrollable choke device 6 in dependence of input data from saiddetector
Claims (12)
1-10. (canceled)
11. A ventilation device comprising a first air duct for air supply and a second air duct for air supply, where the first air duct comprises a first outlet for air flow and the second air duct comprises a second outlet for air flow, where the first outlet is arranged to admit passage for a predefined amount of air per time unit, where 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, where 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, wherein the 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.
12. The ventilation device according to claim 11 , wherein each detector is arranged to detect at least one of temperature, air humidity, carbon dioxide content, motions and presence.
13. (canceled)
14. The ventilation device according to claim 13 , wherein the control unit is arranged to control the choke device such that the first period of time is constant while the second period of time is controllably variable, such that the first position is taken during constant periods of time with controllably variable periodicity.
15. The ventilation device according to claim 13 , wherein the control unit is arranged to control the choke device such that the first period of time is controllably variable such that the first position is taken during controllably variable periods of time with a constant periodicity.
16. (canceled)
17. 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, wherein 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 a demand controlled ventilation is obtained, where the control of the choke device results in a 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.
18. The method according to claim 16 , wherein said detection refers to at least one of temperature, air humidity, carbon dioxide content, motions and presence.
19. (canceled)
20. The method according to claim 16 , wherein the control of the choke device results in that the first period of time is constant while the second period of time is controllably variable, such that the first position is taken during constant periods of time with a controllably variable periodicity.
21. The method according to claim 16 , wherein the control of the choke device results in that the first period of time is controllably variable such that the first position is taken during controllably variable periods of time with a constant periodicity.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1251036A SE537032C2 (en) | 2012-09-17 | 2012-09-17 | Ventilation device comprising a first outlet and a second outlet |
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)
Publication Number | Publication Date |
---|---|
US20150226449A1 true US20150226449A1 (en) | 2015-08-13 |
Family
ID=50278535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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)
Country | Link |
---|---|
US (1) | US20150226449A1 (en) |
EP (1) | EP2909540B1 (en) |
SE (1) | SE537032C2 (en) |
WO (1) | WO2014042588A1 (en) |
Cited By (2)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108332374B (en) * | 2018-01-30 | 2021-06-18 | 广东美的制冷设备有限公司 | Air conditioner and fresh air control method and device thereof |
Citations (14)
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 |
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 (en) * | 2006-04-03 | 2007-10-10 | Callenberg Fläkt Marine AB | Airflow regulation device and method |
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2609743A (en) * | 1947-01-16 | 1952-09-09 | Carrier Corp | Dual duct air conditioning system |
SE383920B (en) * | 1973-10-02 | 1976-04-05 | Svenska Flaektfabriken Ab | PROCEDURE FOR AIR CONDITIONING OF A NUMBER OF PREMISES WITH SINCE DIFFERENT HEATING NEEDS |
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 |
-
2012
- 2012-09-17 SE SE1251036A patent/SE537032C2/en unknown
-
2013
- 2013-09-17 US US14/427,945 patent/US20150226449A1/en not_active Abandoned
- 2013-09-17 WO PCT/SE2013/051085 patent/WO2014042588A1/en active Application Filing
- 2013-09-17 EP EP13836491.4A patent/EP2909540B1/en active Active
Patent Citations (14)
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 (en) * | 2006-04-03 | 2007-10-10 | Callenberg Fläkt Marine AB | Airflow regulation device and method |
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 (2)
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 |
Also Published As
Publication number | Publication date |
---|---|
WO2014042588A1 (en) | 2014-03-20 |
EP2909540A4 (en) | 2016-07-27 |
EP2909540A1 (en) | 2015-08-26 |
SE1251036A1 (en) | 2014-03-18 |
SE537032C2 (en) | 2014-12-09 |
EP2909540B1 (en) | 2017-11-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102778009B (en) | Temperature-humidity control device and method for variable-air-volume air-conditioning system | |
US9347678B2 (en) | Distributed indoor air quality control module and method | |
CN103528144B (en) | Fresh air variable air rate power-economizing method and device based on absolute humidity control | |
EP1954988B1 (en) | Atmospheric density reference control | |
US20150226449A1 (en) | Ventilation device comprising a first outlet and a second outlet | |
US20070253831A1 (en) | Method and apparatus for maintaining air characteristics in an air ventilated facility using fan filter units | |
EP3117155B1 (en) | Device and method for controlling a supply air flow at an air treatment system | |
EP3011232B1 (en) | Air curtain device measuring a temperature profile and method there for | |
WO2019164804A1 (en) | System and method for multi-zone climate control | |
US9255721B2 (en) | Venturi valve and control system | |
KR20120025386A (en) | Apparatus and method for controlling air condition | |
DE102011002734B4 (en) | Control method for a ventilation device with ventilation device | |
EP2941952B1 (en) | Greenhouse provided with ventilation system | |
JP2017101861A (en) | Air control system, air control method and air control device | |
US20210172779A1 (en) | Systems and methods for control of an air duct | |
WO2018040616A1 (en) | Method and system for detecting dirt blockage of air conditioner based on single pressure sensor, and air conditioner | |
US8006571B2 (en) | Air flow measurement | |
EP2527753A1 (en) | Device and method for regulating a fresh air supply for a device for cooling, heating and/or ventilating a building | |
KR20180074463A (en) | Environment management device for Getting Shiitake Mushroom, and method for the same | |
CN112815412A (en) | Device and method for controlling air output of clean area purification system | |
CN202747542U (en) | Temperature and humidity control device for variable air volume air conditioning system | |
JP2018071834A (en) | Indoor environment control system, humidifier, and air conditioner | |
CN215062495U (en) | Device for controlling air output of clean area purification system | |
SE1300298A1 (en) | Rules and control system for rooms | |
KR101941429B1 (en) | Ventilation equipment with function of estimating carbon dioxide |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SWEGON AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LARSSON, PER-AKE;SODERBERG, TOMAS;REEL/FRAME:035219/0054 Effective date: 20150302 |
|
AS | Assignment |
Owner name: SWEGON OPERATIONS AB, SWEDEN Free format text: CHANGE OF NAME;ASSIGNOR:SWEGON AB;REEL/FRAME:041791/0165 Effective date: 20170206 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |