US20130040548A1 - Fan flow synchronizer - Google Patents
Fan flow synchronizer Download PDFInfo
- Publication number
- US20130040548A1 US20130040548A1 US13/385,726 US201113385726A US2013040548A1 US 20130040548 A1 US20130040548 A1 US 20130040548A1 US 201113385726 A US201113385726 A US 201113385726A US 2013040548 A1 US2013040548 A1 US 2013040548A1
- Authority
- US
- United States
- Prior art keywords
- flow
- fan
- atmosphere
- sensor
- supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- 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
-
- 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
- F24F2011/0004—Control or safety arrangements for ventilation for admittance of outside air to create overpressure in a room
-
- 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
- F24F2011/0005—Control or safety arrangements for ventilation for admittance of outside air to create underpressure in a room, keeping contamination inside
Definitions
- This invention is involved in the moving of supply and exhaust/return air under low pressure, maximum of 10 inches water column, for the purpose of conditioning of space and space pressurization, positive or negative.
- other methods have been attempted that are either very expensive or don't perform or both in the stable controlled decoupling of the fans at a low cost.
- the purpose of the invention is to synchronize supply fan 15 and exhaust fan 16 flows so that a set flow differential is maintained between the two fans without one fan or the other affecting the stability of the flow difference desired and set between the fans allowing the fans to be decoupled and prevented from series flow operation.
- FIG. 1 Exhaust/return fan 16 synchronized to a variable flow static pressure controlled supply fan 15 . Positive building pressure.
- FIG. 2 Supply fan 15 synchronized to a variable flow static pressure controlled exhaust/return fan 16 . Negative building pressure.
- FIG. 3 Room pressurization. Positive to atmosphere.
- FIG. 4 Room pressurization. Negative to atmosphere.
- FIG. 5 Detail of invention.
- the fan flow synchronizer invention receives air flow input from the supply duct static pressure receiver 3 into a small tube 5 , 2′′ IPS maximum, and allows flow through the tube 5 past an adjustable ball valve 4 to the pitot tube 2 mounted in line 5 .
- the pitot sensor 2 produces a differential flow signal which is sent to the differential receiver 6 then to the differential transmitter 7 .
- a proportional, integral, derivative controller 8 sends a continuous output control signal 9 to the exhaust/recirc fan's 16 variable flow control device 13 .
- This device can be a variable speed motor, inlet vanes, vortex vanes or outlet damper 14 .
- This control is set to produce a CFM that is less than the supply fan 15 CFM and to hold the CFM difference through the full operating range of the system. This operation allows stable building positive pressure and prevents unstable series fan connection.
- the supply fan 15 is controlled from a static pressure sensor 10 which output transmitter 11 sends signal to the variable flow device 14 similar to those listed for the exhaust/recirc fan 16 above.
- the supply fan 15 is set to control the system pressure at a constant point as it responds to the variable flow of the users 17 and maintains a positive building pressure compared to outside atmosphere.
- a differential flow signal comes from pitot 2 to the differential sensor 6 .
- a differential pressure transmitter 7 receives the signal and sends it to the proportional, integral, derivative controller 8 which outputs a control signal 9 to the variable speed motor 14 to control the supply fan 15 speed to synchronize the supply fan 15 to the exhaust fan 16 at a fixed CFM flow difference.
Abstract
The fan synchronizer is a small flow tube 5, 2″ IPS or smaller, connected between the supply fan 13 duct and return and/or exhaust fan 16 duct that allows flow through the tube 5 to issue a signal from an in line flow meter device 2 that will control the supply fan 13 and return/exhaust fan 16 to be synchronized to hold a set flow difference throughout the system flow range without series flow instability. The purpose is to maintain, in a variable flow system, a positive or negative building or room pressure difference to atmosphere, avoiding series flow instability of the fans.
Description
- No cross references to related applications.
- No federally sponsored development is involved.
- No reference to sequence listing or computer program listing or computer disc appendix.
- This invention is involved in the moving of supply and exhaust/return air under low pressure, maximum of 10 inches water column, for the purpose of conditioning of space and space pressurization, positive or negative. To date other methods have been attempted that are either very expensive or don't perform or both in the stable controlled decoupling of the fans at a low cost.
- The purpose of the invention is to synchronize
supply fan 15 andexhaust fan 16 flows so that a set flow differential is maintained between the two fans without one fan or the other affecting the stability of the flow difference desired and set between the fans allowing the fans to be decoupled and prevented from series flow operation. -
FIG. 1 Exhaust/return fan 16 synchronized to a variable flow static pressure controlledsupply fan 15. Positive building pressure. -
FIG. 2 Supply fan 15 synchronized to a variable flow static pressure controlled exhaust/return fan 16. Negative building pressure. -
FIG. 3 Room pressurization. Positive to atmosphere. -
FIG. 4 Room pressurization. Negative to atmosphere. -
FIG. 5 Detail of invention. -
-
Reference Number Name of Part 2 Flow Sensor - Pitot tube, orifice plate, venturi or turbine 3 Static Pressure Sensor - Top hat design 4 Full port ball type adjustment valve 5 Air flow tube - 2″ IPS max size 6 Differential Sensor Cell - Pressure 7 Differential Pressure Transmitter 8 Proportional, integral, derivative controller 9 Signal output from controller to speed control/inlet vanes/vortex damper of fan 10 Static Pressure Sensor 11 Static Pressure Transmitter 12 Static Pressure Controller 13 Flow Synchronizer Controller 14 Vari-Speed motor or inlet vane or vortex damper 15 Supply air fan 16 Exhaust air fan and/or recirc/ exhaust 17 Variable flow room or space-typical 18 Fresh, return and exhaust dampers 19 Damper Actuator 20 Air supply to room or space 21 Air exhaust from room or space 22 Controlled damper 23 Heating coil 24 Cooling coil 25 Variable flow inlet box - The fan flow synchronizer invention receives air flow input from the supply duct
static pressure receiver 3 into asmall tube tube 5 past anadjustable ball valve 4 to thepitot tube 2 mounted inline 5. Thepitot sensor 2 produces a differential flow signal which is sent to thedifferential receiver 6 then to thedifferential transmitter 7. - A proportional, integral,
derivative controller 8 sends a continuousoutput control signal 9 to the exhaust/recirc fan's 16 variableflow control device 13. This device can be a variable speed motor, inlet vanes, vortex vanes oroutlet damper 14. This control is set to produce a CFM that is less than thesupply fan 15 CFM and to hold the CFM difference through the full operating range of the system. This operation allows stable building positive pressure and prevents unstable series fan connection. Thesupply fan 15 is controlled from astatic pressure sensor 10 which output transmitter 11 sends signal to thevariable flow device 14 similar to those listed for the exhaust/recirc fan 16 above. - The
supply fan 15 is set to control the system pressure at a constant point as it responds to the variable flow of theusers 17 and maintains a positive building pressure compared to outside atmosphere. - To cause a negative building pressure see drawing 2/6 where the
exhaust fan 16 draws air from the building andvariable flow user 17 to produce a negative pressure versus atmosphere. Static pressure is sensed atstatic pressure sensor 3 in theexhaust fan 16 discharge duct. Air flow fromsensor 3 through the fullport ball valve 4 then through the 2′ IPS pipe 5 then through thepitot flow sensor 2 then into thesupply fan 15 suction. A differential flow signal comes frompitot 2 to thedifferential sensor 6. Adifferential pressure transmitter 7 receives the signal and sends it to the proportional, integral,derivative controller 8 which outputs acontrol signal 9 to thevariable speed motor 14 to control thesupply fan 15 speed to synchronize thesupply fan 15 to theexhaust fan 16 at a fixed CFM flow difference. - This prevents the
fans
Claims (4)
1. Synchronize and track return/exhaust fan 16 flow with supply fan 15 flow by sensing flow through a 2″ IPS maximum pilot line 5 and flow sensor 2 between the supply fan 15 discharge duct and the return/exhaust fan 16 inlet duct when static pressure controls supply fan 15 and variable flow system has a positive pressure to atmosphere.
2. Synchronize and track supply fan 15 flow with exhaust fan 16 flow by sensing flow through a 2″ IPS maximum pilot line 5 and flow sensor 2 between the exhaust fan outlet duct and supply fan inlet duct when static pressure 10 controls the exhaust fan 16 and the variable flow system is controlled to negative pressure versus the atmosphere.
3. Control room pressure positive to atmosphere by sensing flow through tube 5 flowing from room sensor 3 to atmosphere sensor 3 and air flowing into room from supply source 20 at a higher rate than controlled air leaving through the exhaust damper 22.
4. Control room pressure negative to atmosphere by sensing flow from atmosphere to room through tube 5 flowing from sensor 3 from atmosphere to sensor 3 in the room then out through controlled exhaust damper 22 at a rate higher than the air supplied by the inlet supply duct 20.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/385,726 US20130040548A1 (en) | 2011-08-12 | 2011-08-12 | Fan flow synchronizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/385,726 US20130040548A1 (en) | 2011-08-12 | 2011-08-12 | Fan flow synchronizer |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130040548A1 true US20130040548A1 (en) | 2013-02-14 |
Family
ID=47677817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/385,726 Abandoned US20130040548A1 (en) | 2011-08-12 | 2011-08-12 | Fan flow synchronizer |
Country Status (1)
Country | Link |
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US (1) | US20130040548A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150362205A1 (en) * | 2014-06-13 | 2015-12-17 | Lennox Industries Inc. | Airflow-confirming hvac systems and methods with variable speed blower |
CN107940639A (en) * | 2017-11-09 | 2018-04-20 | 珠海格力电器股份有限公司 | The control method and device of handpiece Water Chilling Units |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026285A (en) * | 1972-04-05 | 1977-05-31 | Jackson Richard R | Humidifier for air to be inhaled |
US4043355A (en) * | 1976-06-22 | 1977-08-23 | Air Products And Chemicals, Inc. | Combined flow measuring and valve leakage indicator |
US4437608A (en) * | 1982-05-17 | 1984-03-20 | Smith Robert B | Variable air volume building ventilation system |
US4550747A (en) * | 1983-10-05 | 1985-11-05 | Digital Hydraulics, Inc. | Digital fluid pressure flow rate and position control system |
US5138845A (en) * | 1991-04-09 | 1992-08-18 | Brdg-Tndr Corporation | Method and apparatus for controlling the flow of process fluids |
US5318106A (en) * | 1990-01-12 | 1994-06-07 | Dorini Donald K | Method and apparatus for controlling the flow of process fluids |
US5720658A (en) * | 1992-02-11 | 1998-02-24 | Belusa; Manfred L. | Space pressurization control system for high containment laboratories |
US5892145A (en) * | 1996-12-18 | 1999-04-06 | Alliedsignal Inc. | Method for canceling the dynamic response of a mass flow sensor using a conditioned reference |
US5951394A (en) * | 1994-11-22 | 1999-09-14 | Lighthouse Associates, Inc. | Controller to maintain a certain set of environmental parameters in an environment |
US6227961B1 (en) * | 1998-05-21 | 2001-05-08 | General Electric Company | HVAC custom control system |
US7028768B2 (en) * | 2003-08-20 | 2006-04-18 | Itt Manufacturing Enterprises, Inc. | Fluid heat exchange control system |
US7059536B2 (en) * | 2002-07-19 | 2006-06-13 | Mestek, Inc. | Air circulation system |
US20070082601A1 (en) * | 2005-03-10 | 2007-04-12 | Desrochers Eric M | Dynamic control of dilution ventilation in one-pass, critical environments |
US20070209653A1 (en) * | 2003-03-06 | 2007-09-13 | Exhausto, Inc. | Pressure Controller for a Mechanical Draft System |
-
2011
- 2011-08-12 US US13/385,726 patent/US20130040548A1/en not_active Abandoned
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026285A (en) * | 1972-04-05 | 1977-05-31 | Jackson Richard R | Humidifier for air to be inhaled |
US4043355A (en) * | 1976-06-22 | 1977-08-23 | Air Products And Chemicals, Inc. | Combined flow measuring and valve leakage indicator |
US4437608A (en) * | 1982-05-17 | 1984-03-20 | Smith Robert B | Variable air volume building ventilation system |
US4550747A (en) * | 1983-10-05 | 1985-11-05 | Digital Hydraulics, Inc. | Digital fluid pressure flow rate and position control system |
US5318106A (en) * | 1990-01-12 | 1994-06-07 | Dorini Donald K | Method and apparatus for controlling the flow of process fluids |
US5138845A (en) * | 1991-04-09 | 1992-08-18 | Brdg-Tndr Corporation | Method and apparatus for controlling the flow of process fluids |
US5720658A (en) * | 1992-02-11 | 1998-02-24 | Belusa; Manfred L. | Space pressurization control system for high containment laboratories |
US5951394A (en) * | 1994-11-22 | 1999-09-14 | Lighthouse Associates, Inc. | Controller to maintain a certain set of environmental parameters in an environment |
US5892145A (en) * | 1996-12-18 | 1999-04-06 | Alliedsignal Inc. | Method for canceling the dynamic response of a mass flow sensor using a conditioned reference |
US6227961B1 (en) * | 1998-05-21 | 2001-05-08 | General Electric Company | HVAC custom control system |
US7059536B2 (en) * | 2002-07-19 | 2006-06-13 | Mestek, Inc. | Air circulation system |
US20070209653A1 (en) * | 2003-03-06 | 2007-09-13 | Exhausto, Inc. | Pressure Controller for a Mechanical Draft System |
US7028768B2 (en) * | 2003-08-20 | 2006-04-18 | Itt Manufacturing Enterprises, Inc. | Fluid heat exchange control system |
US20070082601A1 (en) * | 2005-03-10 | 2007-04-12 | Desrochers Eric M | Dynamic control of dilution ventilation in one-pass, critical environments |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150362205A1 (en) * | 2014-06-13 | 2015-12-17 | Lennox Industries Inc. | Airflow-confirming hvac systems and methods with variable speed blower |
US9692347B2 (en) * | 2014-06-13 | 2017-06-27 | Lennox Industries Inc. | Airflow-confirming HVAC systems and methods with variable speed blower |
CN107940639A (en) * | 2017-11-09 | 2018-04-20 | 珠海格力电器股份有限公司 | The control method and device of handpiece Water Chilling Units |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |