US20110097988A1 - Variable air volume economizer minimum position reset - Google Patents
Variable air volume economizer minimum position reset Download PDFInfo
- Publication number
- US20110097988A1 US20110097988A1 US12/741,276 US74127610A US2011097988A1 US 20110097988 A1 US20110097988 A1 US 20110097988A1 US 74127610 A US74127610 A US 74127610A US 2011097988 A1 US2011097988 A1 US 2011097988A1
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- United States
- Prior art keywords
- fan
- air
- speed
- economizer
- set forth
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- 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.)
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Classifications
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- 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
- F24F11/77—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 controlling the speed of ventilators
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- 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
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
-
- 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
- F24F2011/0002—Control or safety arrangements for ventilation for admittance of outside air
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- 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
- F24F2011/0006—Control or safety arrangements for ventilation using low temperature external supply air to assist cooling
-
- 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
- This invention relates generally to variable air volume air conditioning systems and, more particularly, to a system for operating the economizer damper therein to ensure sufficient outside air is introduced in order to meet minimum ventilation code requirements.
- a central thermostat controls the temperature of air in the building.
- a building central heating/cooling unit forces a constant amount of heated or cooled air to various points in the building through duct work comprising a supply air duct, a plurality of zone ducts and a return air duct.
- VAV variable air volume
- the space temperature is controlled by varying the airflow delivered to the space. This is done by means of a variable speed fan controlled by a variable frequency inverter, the position of inlet dampers to the fan or other airflow control devices.
- individual zone dampers are used to control the zone cfm and the supply fan speed is controlled to provide a constant supply duct static pressure.
- the supply cfm is directly controlled on the basis of a space temperature sensor.
- economizers When outdoor temperatures are lower than the indoor temperature, many units are equipped with outside and return air dampers that are modulated to control the use of outside air to provide free cooling to the space. These damper systems are typically called economizers.
- the economizer controls the flow of outside air through the inlet air duct and return air through the return air duct and using the inlet air damper and return air damper with the respective positions being controlled such that air temperature to the space is maintained.
- the industry sometimes uses expensive airflow sensors that measure the actual amount of outside air that is coming through the outside air inlet and then uses the value to readjust the economizer damper minimum position accordingly to ensure that the minimum ventilation air is delivered even through the supply airflow is varying to meet the cooling load. For example for a 20 ton unit the required full load cfm might be 8,000 cfm. For 20% outside air the ventilating air would be 1,600. As per the previous discussions this might be the amount of air that is obtained with a damper position of 16%. As the building load decreases the supply fan will be slowed to provide the amount of air to cool the space.
- the unit controls would readjust the economizer minimum damper position to a larger position where the required 2,000 cfm of air would be delivered. Depending on the characteristics of the dampers and the building ductwork this might be at a damper position of around 45%.
- the minimum damper position does not remain fixed but is varied to ensure that sufficient outside air is brought in even during periods in which the VAV fan speed is reduced.
- the minimum damper position is varied as a function of the fan speed such that, generally, as the fan speed is reduced, the minimum damper position is adjusted to a further opened position.
- the minimum damper position is varied in a non-linear relationship with the variable fan speed to compensate for the typical non-linearity of the economizer dampers.
- FIG. 1 is a schematic illustration of a rooftop air conditioning system with the present invention incorporated therein.
- FIG. 2 is a graphic illustration of the percentage of outside air in relationship to the damper position of the economizer.
- FIG. 3 is a graphic illustration of the economizer damper position in relationship to the fan speed of the system.
- FIG. 1 Shown in FIG. 1 is a typical packaged rooftop air conditioner having a condenser section 11 , an evaporator section 12 and an economizer section 13 .
- the condenser section 11 includes a compressor 14 for receiving refrigerant vapor from the evaporator section 12 and compressing the vapor before it is condensed.
- Also included in the condenser section 11 is a condenser coil 16 and a condenser fan 17 for passing ambient air through the condenser coil 16 .
- the evaporator section 12 includes a supply fan 18 which is driven by a fan motor 19 .
- the fan motor is adapted to operate at variable speeds to meet the cooling/heating requirements of the system.
- One manner of providing the variable speed is by the use of an inverter for providing variable frequency power to the fan motor 19 .
- a cooling coil 21 and its associated filters 22 Leading into the evaporator section 12 from the economizer section 13 is a cooling coil 21 and its associated filters 22 .
- a heater 23 is placed in a downstream position from the supply fan 18 .
- the supply fan 18 draws air in through the filter 22 and the cooling coil 21 where it is cooled by refrigerant passing through the cooling coil 21 .
- the cooled air then passes to the supply air duct 24 from which it is distributed within the building.
- the air is passed from the supply fan 18 through the heater 23 where it is heated prior to being passed into the supply air duct 24 .
- the economizer damper 29 includes an inlet air damper 30 and a linked return air damper 35 , which are adjustable to selectively mix an amount of outside air coming in the outside air intake vent 26 with the portion of the return air that is flowing into the economizer section 13 from the return air duct 31 . Another portion of the return air is caused to pass out the exhaust air vent by the exhaust fan 28 .
- the economizer damper may, to a degree, be placed in further opened positions, as the speed of the fan motor 19 is reduced, less air, and therefore less outside air, is drawn into the evaporator section 12 . Provision is therefore made to ensure that sufficient outside air is available to meet the requirements of the system. This is accomplished by way of a control 32 which senses fan speed 33 and controls the damper position 34 in response thereto in a manner to be described hereinafter.
- the first step is to define the characteristic curve for the damper position vs. the % outside air by a series of points.
- curves defining the damper position vs. % outside are not linear.
- a number of points are required to define the curve.
- a typical curve is shown in FIG. 2 .
- the curve is defined by four (4) points as shown.
- Point A represents a damper position of 68% open, resulting in 80% outside air.
- point B a 47% position with 60% outside air
- point C a 39% position with 40% outside air
- point D a 14% position with 20% outside air.
- the dampers will provide 0% cfm at the 0% position and 100% cfm at the 100% position. Between these points one can then use straight line interpolation to determine the damper position required to maintain the percentage of outside air.
- control 32 includes look-up tables relating the damper position to percent of outside air and the damper position to the fan speed as shown in FIGS. 2 and 3 , respectively.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A rooftop air conditioner having a variable speed fan and an economizer also includes a control feature for adjusting the minimum damper position in response to the speed of the fan during predetermined conditions in order to maintain a desired volume of fresh air from the economizer.
Description
- This invention relates generally to variable air volume air conditioning systems and, more particularly, to a system for operating the economizer damper therein to ensure sufficient outside air is introduced in order to meet minimum ventilation code requirements.
- In a typical climate control system of a building, a central thermostat controls the temperature of air in the building. A building central heating/cooling unit forces a constant amount of heated or cooled air to various points in the building through duct work comprising a supply air duct, a plurality of zone ducts and a return air duct.
- In variable air volume (VAV) systems the space temperature is controlled by varying the airflow delivered to the space. This is done by means of a variable speed fan controlled by a variable frequency inverter, the position of inlet dampers to the fan or other airflow control devices. For larger or by varying VAV systems, individual zone dampers are used to control the zone cfm and the supply fan speed is controlled to provide a constant supply duct static pressure. On smaller VAV systems used in single zone applications the supply cfm is directly controlled on the basis of a space temperature sensor.
- When outdoor temperatures are lower than the indoor temperature, many units are equipped with outside and return air dampers that are modulated to control the use of outside air to provide free cooling to the space. These damper systems are typically called economizers. The economizer controls the flow of outside air through the inlet air duct and return air through the return air duct and using the inlet air damper and return air damper with the respective positions being controlled such that air temperature to the space is maintained.
- Because of air quality control needs in a building, the industry has established standards (i.e. ASHRAE 62.1) to ensure that a certain amount of fresh air (i.e. 15 cfm per person) is brought in through the economizer. For that purpose, a minimum open position is established such that the economizer damper is never fully closed but can only be closed to a predetermined minimum position. It has been recognized that with a variable indoor flow rate as with a VAV system and other zoning systems, the fixed minimum damper position would result in insufficient ventilation air when the indoor air flow rate is decreased below the design full load airflow. To solve this problem the industry sometimes uses expensive airflow sensors that measure the actual amount of outside air that is coming through the outside air inlet and then uses the value to readjust the economizer damper minimum position accordingly to ensure that the minimum ventilation air is delivered even through the supply airflow is varying to meet the cooling load. For example for a 20 ton unit the required full load cfm might be 8,000 cfm. For 20% outside air the ventilating air would be 1,600. As per the previous discussions this might be the amount of air that is obtained with a damper position of 16%. As the building load decreases the supply fan will be slowed to provide the amount of air to cool the space. If the supply air flow reduces to 4,000 cfm then at the 16% damper position the outside air would also reduce in proportion to the supply air and the amount of outside air would reduce to around 1,000 cfm and the proper supply air would not be delivered. For the units equipped with the outside air cfm sensor the unit controls would readjust the economizer minimum damper position to a larger position where the required 2,000 cfm of air would be delivered. Depending on the characteristics of the dampers and the building ductwork this might be at a damper position of around 45%.
- What is needed is an inexpensive and effective approach to ensure that sufficient outside air will be brought in, particularly during periods of time when the variable air volume fan is slowed because of reduced building cooling requirements.
- Briefly, in accordance with one aspect of the invention, the minimum damper position does not remain fixed but is varied to ensure that sufficient outside air is brought in even during periods in which the VAV fan speed is reduced.
- By another aspect of the invention, the minimum damper position is varied as a function of the fan speed such that, generally, as the fan speed is reduced, the minimum damper position is adjusted to a further opened position.
- By another aspect of the invention, the minimum damper position is varied in a non-linear relationship with the variable fan speed to compensate for the typical non-linearity of the economizer dampers.
- In the drawings as hereinafter described, a preferred embodiment is depicted; however, various other modifications and alternate constructions can be made thereto without departing from the spirit and scope of the invention.
-
FIG. 1 is a schematic illustration of a rooftop air conditioning system with the present invention incorporated therein. -
FIG. 2 is a graphic illustration of the percentage of outside air in relationship to the damper position of the economizer. -
FIG. 3 is a graphic illustration of the economizer damper position in relationship to the fan speed of the system. - Shown in
FIG. 1 is a typical packaged rooftop air conditioner having acondenser section 11, anevaporator section 12 and aneconomizer section 13. Thecondenser section 11 includes acompressor 14 for receiving refrigerant vapor from theevaporator section 12 and compressing the vapor before it is condensed. Also included in thecondenser section 11 is acondenser coil 16 and acondenser fan 17 for passing ambient air through thecondenser coil 16. - The
evaporator section 12 includes asupply fan 18 which is driven by afan motor 19. The fan motor is adapted to operate at variable speeds to meet the cooling/heating requirements of the system. One manner of providing the variable speed is by the use of an inverter for providing variable frequency power to thefan motor 19. - Leading into the
evaporator section 12 from theeconomizer section 13 is acooling coil 21 and its associatedfilters 22. Aheater 23 is placed in a downstream position from thesupply fan 18. In operation, thesupply fan 18 draws air in through thefilter 22 and thecooling coil 21 where it is cooled by refrigerant passing through thecooling coil 21. The cooled air then passes to the supply air duct 24 from which it is distributed within the building. Alternatively, in the heating mode, the air is passed from thesupply fan 18 through theheater 23 where it is heated prior to being passed into the supply air duct 24. - Included within the
economizer section 13 is an outsideair intake vent 26, anexhaust air vent 27 and its associatedexhaust fan 28, and aneconomizer damper 29. Theeconomizer damper 29 includes aninlet air damper 30 and a linkedreturn air damper 35, which are adjustable to selectively mix an amount of outside air coming in the outsideair intake vent 26 with the portion of the return air that is flowing into theeconomizer section 13 from thereturn air duct 31. Another portion of the return air is caused to pass out the exhaust air vent by theexhaust fan 28. - It will be understood that, although the economizer damper may, to a degree, be placed in further opened positions, as the speed of the
fan motor 19 is reduced, less air, and therefore less outside air, is drawn into theevaporator section 12. Provision is therefore made to ensure that sufficient outside air is available to meet the requirements of the system. This is accomplished by way of acontrol 32 which sensesfan speed 33 and controls thedamper position 34 in response thereto in a manner to be described hereinafter. - The first step is to define the characteristic curve for the damper position vs. the % outside air by a series of points. Typically curves defining the damper position vs. % outside are not linear. Depending on how non-linear the curve is, a number of points are required to define the curve. A typical curve is shown in
FIG. 2 . In this example, the curve is defined by four (4) points as shown. Point A represents a damper position of 68% open, resulting in 80% outside air. Similarly, point B, a 47% position with 60% outside air, point C, a 39% position with 40% outside air, and point D, a 14% position with 20% outside air. It is also known that the dampers will provide 0% cfm at the 0% position and 100% cfm at the 100% position. Between these points one can then use straight line interpolation to determine the damper position required to maintain the percentage of outside air. - With the characteristic curve now defined in the unit control software one can then use the curve to adjust the outside air percentage required as a function of the indoor fan speed.
- We know that for a given damper position the amount of outside air delivered will vary just about directly with the fan speed on inverter driven fans due to the characteristics of the fan. Therefore we can take the fan speed and use it to adjust the percent outside air that we want to deliver to the space. For example if the VAV controls only require the indoor fan to run at 50% speed, then we know we would have to provide 40% outsider air to maintain the same absolute amount of outside air that would have been deliver at 100% fan speed with 20% outside air. So using the curve we would adjust the dampers open from the 100% fan speed point of 14% to the 40% point damper position which is 29%. In between the defined points, a straight line interpolation can be used to solve for the damper position to deliver the required percentage of outside air and cfm.
- Using the characteristic curve for the damper position vs. outside air percentage, one can then relate the indoor fan speed to the damper setting as shown in Table I as follows:
-
Fan Supply Outside % Outside Damper Speed CFM Air CFM Air Position 100% 10000 2000 20% 14% 75% 7500 2000 27% 20% 50% 5000 2000 40% 39% 25% 2500 2000 80% 68% 20% 2000 2000 100% 100% - One knows that the supply cfm is going to vary linearly with the fan speed so in order to maintain constant outside air cfm, one can use the
control 32 to maintain theproper damper position 34 on the basis of fan speed as set forth inFIG. 3 so as to maintain constant outside air. Thecontrol 32 thus includes look-up tables relating the damper position to percent of outside air and the damper position to the fan speed as shown inFIGS. 2 and 3 , respectively. - While the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawings, it will be understood by one skilled in the art that various changes in detail may be effected therein without departing from the spirit and scope of the invention as defined by the claims.
Claims (11)
1. A system for controlling air quality in a building having an air temperature conditioning unit with a variable speed flow inducing apparatus, and an economizer comprising:
a damper for controlling the volume of outside air flow through the economizer, said damper having a variable minimum damper position; and
a control for varying the minimum damper position in response to the speed of said flow inducing apparatus during predetermined operating conditions.
2. A system as set forth in claim 1 wherein said flow inducing apparatus is a variable speed fan.
3. A system as set forth in claim 2 wherein said fan receives its power from an inverter.
4. A system as set forth in claim 2 wherein the characteristics of the fan are such that, for a given damper position, the amount of outside air delivered will be substantially proportional to the speed of the fan.
5. A system as set forth in claim 2 wherein the characteristics of the fan are such that the volume of the air delivered by the fan will be substantially proportional to the speed of the fan.
6. A system as set forth in claim 1 wherein said control also includes software which determines the relationship between the percent of outside air and the damper position for the economizer.
7. A method for improving air quality in a building having a climate control system that includes in serial flow relationship, an economizer with a minimum damper position, a variable speed flow inducing apparatus and a supply air duct, comprising the steps of:
as the demand for air in the supply air duct is reduced, reducing the speed of the flow inducing apparatus and, when that speed is within a predetermined range, adjusting the minimum damper position in response to the speed of the flow inducing apparatus.
8. A method as set forth in claim 7 and including the step of determining the relationship between the percent of outside air and the damper position for the economizer.
9. A method as set forth in claim 7 wherein said minimum damper position is adjusted non-linearly with respect to the speed of the flow inducing apparatus.
10. A method as set forth in claim 7 wherein said flow inducing apparatus is a variable speed fan.
11. A method as set forth in claim 10 and including the step of providing variable power to said flow inducing device.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/US2007/023365 WO2009061293A1 (en) | 2007-11-06 | 2007-11-06 | Variable air volume economizer minimum position reset |
Publications (1)
Publication Number | Publication Date |
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US20110097988A1 true US20110097988A1 (en) | 2011-04-28 |
Family
ID=40626016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/741,276 Abandoned US20110097988A1 (en) | 2007-11-06 | 2007-11-06 | Variable air volume economizer minimum position reset |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110097988A1 (en) |
CN (1) | CN101849142A (en) |
WO (1) | WO2009061293A1 (en) |
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US20110264275A1 (en) * | 2010-04-21 | 2011-10-27 | Honeywell International Inc. | Demand control ventilation system with commissioning and checkout sequence control |
US20130261810A1 (en) * | 2011-09-27 | 2013-10-03 | Jpmorgan Chase Bank, N.A. | Heating, Ventilation, and Air Conditioning Management System and Method |
US20140331694A1 (en) * | 2013-05-08 | 2014-11-13 | Carrier Corporation | Movement of electronic expansion valve |
US8918218B2 (en) | 2010-04-21 | 2014-12-23 | Honeywell International Inc. | Demand control ventilation system with remote monitoring |
US20160161139A1 (en) * | 2014-12-08 | 2016-06-09 | Johnson Controls Technology Company | State-based control in an air handling unit |
US9435557B2 (en) | 2013-01-24 | 2016-09-06 | Belimo Holding Ag | Control unit for an HVAC system comprising an economizer and method for operating such control unit |
US9500382B2 (en) | 2010-04-21 | 2016-11-22 | Honeywell International Inc. | Automatic calibration of a demand control ventilation system |
US20170010017A1 (en) * | 2015-07-09 | 2017-01-12 | Trane International Inc. | Systems, aparatuses, and methods of air circulations using compact economizers |
US9568204B2 (en) | 2013-01-31 | 2017-02-14 | Johnson Controls Technology Company | Systems and methods for rapid disturbance detection and response |
US9581985B2 (en) | 2014-02-21 | 2017-02-28 | Johnson Controls Technology Company | Systems and methods for auto-commissioning and self-diagnostics |
US9703299B2 (en) | 2010-09-24 | 2017-07-11 | Honeywell International Inc. | Economizer controller plug and play system recognition with automatic user interface population |
US9845963B2 (en) | 2014-10-31 | 2017-12-19 | Honeywell International Inc. | Economizer having damper modulation |
US10060642B2 (en) | 2014-10-22 | 2018-08-28 | Honeywell International Inc. | Damper fault detection |
US10247429B2 (en) | 2017-05-18 | 2019-04-02 | Haier Us Appliance Solutions, Inc. | System and method for determining the position of a vent door of a packaged terminal air conditioner unit |
US10274217B2 (en) * | 2015-07-24 | 2019-04-30 | Aeolus Building Efficiency | Integrated airflow control for variable air volume and air handler HVAC systems to reduce building HVAC energy use |
US20190226688A1 (en) * | 2016-05-03 | 2019-07-25 | Carrier Corporation | Packaged air conditioner with vane axial fan |
US10823447B2 (en) | 2011-10-06 | 2020-11-03 | Lennox Industries Inc. | System and method for controlling a blower of an energy recovery ventilator in response to internal air pressure |
US11175054B2 (en) | 2019-06-12 | 2021-11-16 | Haier Us Appliance Solutions, Inc. | Make-up air flow restrictor for a packaged terminal air conditioner unit |
US20220155743A1 (en) * | 2013-03-15 | 2022-05-19 | Pro Star Energy Solutions, L.P. | System and method of advanced digital economization |
US11359950B2 (en) | 2019-12-10 | 2022-06-14 | Johnson Controls Tyco IP Holdings LLP | Reduced length valve assembly with ultrasonic flow sensor |
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US8195335B2 (en) | 2010-01-12 | 2012-06-05 | Honeywell International Inc. | Economizer control |
US8364318B2 (en) | 2010-04-21 | 2013-01-29 | Honeywell International Inc. | Demand control ventilation with fan speed control |
US10018370B2 (en) | 2010-09-24 | 2018-07-10 | Honeywell International Inc. | Economizer/DCV controller with manual sensor calibration |
WO2013109519A1 (en) * | 2012-01-18 | 2013-07-25 | Carrier Corporation | Air conditioning system with reduced power ventilation mode |
CN117125243B (en) * | 2023-10-26 | 2023-12-19 | 江苏永胜海洋工程有限公司 | Diaphragm type air damper for ship |
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WO2009061293A1 (en) | 2009-05-14 |
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