WO2011009458A1 - Method for determination of air flow, exhaust unit and its application - Google Patents
Method for determination of air flow, exhaust unit and its application Download PDFInfo
- Publication number
- WO2011009458A1 WO2011009458A1 PCT/DK2010/000103 DK2010000103W WO2011009458A1 WO 2011009458 A1 WO2011009458 A1 WO 2011009458A1 DK 2010000103 W DK2010000103 W DK 2010000103W WO 2011009458 A1 WO2011009458 A1 WO 2011009458A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust unit
- exhaust
- air
- airflow
- air pressure
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009423 ventilation Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
- A01K1/0058—Construction of air inlets or outlets in roofs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
Definitions
- the invention relates to a method for determining the airflow in exhaust units including exhaust units with rounded inlet and variable dampers for ventilation systems for air outlet such as in animal facilities.
- the invention relates to exhaust unit including exhaust units with rounded inlet and variable dampers for ventilation systems for air outlet such as in animal facilities.
- the invention also relates to the application of method and exhaust unit.
- the most commonly known technique for determining the airflow uses a propeller inserted in the exhaust unit, which is powered by the airflow in the exhaust unit and where the airflow is calculated as a function of the propeller speed.
- JP 2004198271 A From JP 2004198271 A is also known a measuring unit for determining the air output in a canal.
- the measurement in JP 2004198271 A is based on pressure measurements before and after a damper built into a canal.
- the object of the invention is achieved by a method of the type stated in the introductory portion of claim 1 , which is characterized in that an air pressure measurement intake is placed in the exhaust unit's air intake, which is led to a dynamic differential pressure measurer, which has, as another input, the air pressure in the surroundings and where the output from the differential pressure measurer is led to a controller with calculation capacity, which has also got information about the damper's position and the fan's speed, and from these data, the airflow can be determined in the controller by table look-up in data, which has previously been registered.
- the invention also relates to an exhaust unit.
- This exhaust unit is characterized in that the exhaust unit is provided with one air pressure measurement intake.
- the airflow in the exhaust unit can be determined on basis of a dynamic differential pressure measurement without application of movable mechanical components.
- the invention also relates to application of method according to claim 1 or 2 or exhaust unit in relation to claim 3 or 4 to buildings including industrial buildings or animal facilities including for installation of two or more exhaust units in a shared ventilation system.
- Fig. 1 shows an exhaust unit with rounded inlet with fans and variable dampers for ventilation systems for air outlets such as in animal facilities and with mounted air pressure measurement intake, of which its output is led to a differential pressure measurer and where the whole exhaust unit is controlled by a controller.
- Fig. 2 shows parallel coupling of exhaust units where they end in a shared canal.
- FIG. 1 is with 1 shown an exhaust unit for ventilation systems where air is exhausted from e.g. stable facilities with an airflow direction as indicated with the arrow 2.
- the exhaust unit 1 is provided with a ventilator 3, which operates the air exhaustion from the stable facilities.
- the exhaust unit 1 is also provided with an adjustable damper 4, which can be powered by a motor 5.
- the exhaust unit 1 is in the bottom, where the air, which is to be exhausted from the stable facility, is added with the exhaust unit 1 , provided with one rounded inlet 7.
- the exhaust unit 1 is provided with one and only one air pressure measurement intake 6 from which a tube 8 transfers the air pressure from the air pressure measurement intake 6 to a differential pressure measurer 9.
- the differential pressure measurer's second input registers the air pressure in the surrounding air whereby the differential pressure is calculated as the difference between the two registered air pressures.
- a controller 11 is connected to the exhaust unit 1 , which receives the registered dynamic differential pressure from the differential pressure measurer 9.
- the controller can subsequently determine the airflow in the exhaust unit 1 from table look-up in tables stored or embedded from previous test runs and calculations of the relationship between the dynamical differential pressure and the airflow.
- the position of the damper 4 is included, which is however known by the controller 11 , since the controller via cables 12 controls and guides the damper 4.
- air pressure measurement intakes 6 can be mounted in an exhaust unit 1 and that these can be placed on different locations in the exhaust unit 1 in order to optimally use the invention in differently shaped exhaust units.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ventilation (AREA)
- Environmental Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention relates to a method for determining the airflow in exhaust units (1 ) including exhaust units with rounded inlet (7) with fans (3) and variable dampers (4) for ventilation systems to air outlets such as in animal stables or facilities. The invention also relates to exhaust units (1 ) for ventilation systems and the application to e.g. stable facilities. The invention applies registration of the air pressure in one point in an exhaust unit (1 ), which is used for ventilation to determine the airflow in the exhaust unit (1). The measured air pressure in the exhaust unit is included as input to a dynamic differential pressure measurer (9) of which its other input is the air pressure in the surrounding air. With knowledge of the damper's (4) position and the capacity of the fan (3) and the exhaust unit's (1 ) geometry, the airflow in the exhaust unit (1 ) can be determined from table look-up in data, which has appeared from previous measurements and calculations. The invention provides a surprisingly precise determination of the airflow without application of mechanical movable components and is therefore inexpensive, long-term durable and dependable.
Description
Method for determination of air flow, exhaust unit and its application.
The invention relates to a method for determining the airflow in exhaust units including exhaust units with rounded inlet and variable dampers for ventilation systems for air outlet such as in animal facilities.
Moreover, the invention relates to exhaust unit including exhaust units with rounded inlet and variable dampers for ventilation systems for air outlet such as in animal facilities.
The invention also relates to the application of method and exhaust unit.
It is known to determine the airflow in exhaust units, including ones with rounded inlet and variable dampers for ventilation systems for air outlets such as in animal facilities.
The most commonly known technique for determining the airflow uses a propeller inserted in the exhaust unit, which is powered by the airflow in the exhaust unit and where the airflow is calculated as a function of the propeller speed.
It has been found, however, that this known technique involves some drawbacks, including that the inserted measurement propeller increases the air resistance in the exhaust unit. Also, the propeller must be maintained, which includes cleaning, and worn components must sometimes be changed and the determination of the airflow becomes faulty when the propeller becomes covered with dust and filth.
From JP 2004198271 A is also known a measuring unit for determining the air output in a canal.
The measurement in JP 2004198271 A is based on pressure measurements before and after a damper built into a canal.
It has however been found that this technique also has some drawbacks including that it is difficult and relatively demanding, in terms of the required resources, to use a technique, which requires two measurement points on each side of a damper in an air canal.
It is therefore an object of the invention to improve the known method, exhaust unit and application.
The object of the invention is achieved by a method of the type stated in the introductory portion of claim 1 , which is characterized in that an air pressure measurement intake is placed in the exhaust unit's air intake, which is led to a dynamic differential pressure measurer, which has, as another input, the air pressure in the surroundings and where the output from the differential pressure measurer is led to a controller with calculation capacity, which has also got information about the damper's position and the fan's speed, and from these data, the airflow can be determined in the controller by table look-up in data, which has previously been registered.
In this way it thus becomes possible to determine the airflow in the exhaust unit without application of movable mechanical components and without increasing the air resistance in the exhaust unit and only by application of one measurement point in the air canal.
Further appropriate embodiments of the method are stated in claim 2.
As mentioned, the invention also relates to an exhaust unit.
This exhaust unit is characterized in that the exhaust unit is provided with
one air pressure measurement intake.
It is hereby achieved that the airflow in the exhaust unit can be determined on basis of a dynamic differential pressure measurement without application of movable mechanical components.
Further appropriate embodiments appear from claim 4.
The invention, as mentioned, also relates to application of method according to claim 1 or 2 or exhaust unit in relation to claim 3 or 4 to buildings including industrial buildings or animal facilities including for installation of two or more exhaust units in a shared ventilation system.
The invention will now be explained more fully with reference to the drawings, in which:
Fig. 1 shows an exhaust unit with rounded inlet with fans and variable dampers for ventilation systems for air outlets such as in animal facilities and with mounted air pressure measurement intake, of which its output is led to a differential pressure measurer and where the whole exhaust unit is controlled by a controller.
Fig. 2 shows parallel coupling of exhaust units where they end in a shared canal.
In fig. 1 is with 1 shown an exhaust unit for ventilation systems where air is exhausted from e.g. stable facilities with an airflow direction as indicated with the arrow 2. The exhaust unit 1 is provided with a ventilator 3, which operates the air exhaustion from the stable facilities.
The exhaust unit 1 is also provided with an adjustable damper 4, which can be powered by a motor 5. The exhaust unit 1 is in the bottom, where the air, which is to be exhausted from the stable facility, is added with the exhaust unit 1 , provided with one rounded inlet 7.
Furthermore, the exhaust unit 1 is provided with one and only one air pressure measurement intake 6 from which a tube 8 transfers the air pressure from the air pressure measurement intake 6 to a differential pressure measurer 9.
The differential pressure measurer's second input registers the air pressure in the surrounding air whereby the differential pressure is calculated as the difference between the two registered air pressures.
A controller 11 , is connected to the exhaust unit 1 , which receives the registered dynamic differential pressure from the differential pressure measurer 9.
The controller can subsequently determine the airflow in the exhaust unit 1 from table look-up in tables stored or embedded from previous test runs and calculations of the relationship between the dynamical differential pressure and the airflow.
For determining the airflow, the position of the damper 4 is included, which is however known by the controller 11 , since the controller via cables 12 controls and guides the damper 4.
Since the controller simultaneously controls the ventilator 3, all the variable
parameters are known, which have influence on determining the airflow based on measurement of the stated dynamic differential pressure.
Tests and simulations have shown that the most appropriate placement of the air pressure measurement intake 6, in the exhaust unit 1 , is just after the rounded inlet 7 in direction towards the exhaust unit's discharge end.
Long-term tests have also shown that the invention gives a surprisingly precise and long-term stable registration of the airflow in exhaust units 1 with minimal operation costs and maintenance costs.
It is part of the invention that several air pressure measurement intakes 6 can be mounted in an exhaust unit 1 and that these can be placed on different locations in the exhaust unit 1 in order to optimally use the invention in differently shaped exhaust units.
It is also a part of the invention to apply a method as stated or an exhaust unit 1 for buildings including industrial buildings or animal facilities including for installation of two or more exhaust units in a shared canal.
Claims
1. Method for determining the airflow in exhaust units (1) including exhaust units with rounded inlet (7) and variable dampers (4) for ventilation systems for air outlet such as in animal facilities (13) characterized in that an air pressure measurement intake (6) is placed in the exhaust unit's (1 ) air intake, which is led to a dynamic differential pressure measurer (9), which has, as another input, the air pressure in the surroundings and where the output from the differential pressure measurer (9) is led to a controller (11) with calculation capacity, which has also got information about the damper's (4) position and the fan's speed, and from these data, the airflow can be determined in the controller (11) by table look-up in data, which has previously been registered.
2. Method according to claim 1 characterized in that one air pressure measurement intake (6) is placed in the air intake in exhaust units (1) with rounded inlet (7) just after the rounded inlet (7).
3. Exhaust unit (1 ) including exhaust units with rounded inlet (7) and variable dampers (4) for ventilation systems for air outlets such as in animal facilities (13) characterized in that the exhaust unit (1 ) is provided with one air pressure measurement intake (6).
4. Exhaust unit (1 ) according to claim 3 characterized in that one air pressure measurement intake (6) is placed in the air intake in exhaust units (1 ) with rounded inlet (7) just after the rounded inlet (7).
5. Application of method according to claim 1 or 2 or exhaust unit according to claim 3 or 4 for buildings including industrial buildings or animal facilities including for installation of two or more exhaust units in a shared canal including a shared ventilation system.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA200901059 | 2008-08-01 | ||
DKPA200900892 | 2009-07-23 | ||
DKPA200900892 | 2009-07-23 | ||
DKPA200901059 | 2009-09-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011009458A1 true WO2011009458A1 (en) | 2011-01-27 |
Family
ID=43499695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK2010/000103 WO2011009458A1 (en) | 2009-07-23 | 2010-07-05 | Method for determination of air flow, exhaust unit and its application |
Country Status (1)
Country | Link |
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WO (1) | WO2011009458A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10982850B2 (en) * | 2018-05-31 | 2021-04-20 | Exodraft a/s | Flow measurement system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992022790A1 (en) * | 1991-06-12 | 1992-12-23 | ABB Fläkt Aktiebolag | Method and apparatus for measurement of total flow rate in ventilation installations |
DE19851523C1 (en) * | 1998-11-09 | 2000-05-18 | Gauting Gmbh Apparatebau | Fan for compressible delivery medium has arrangement for deriving volume flow from pressure, temperature and rotor speed measurement values |
US6241463B1 (en) * | 1997-06-23 | 2001-06-05 | Babcock-Bsh Gmbh | Method for determining the operating level of a fan and fan |
WO2004072455A2 (en) * | 2003-02-07 | 2004-08-26 | Varidigm Corporation | Pressure sensing system |
-
2010
- 2010-07-05 WO PCT/DK2010/000103 patent/WO2011009458A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992022790A1 (en) * | 1991-06-12 | 1992-12-23 | ABB Fläkt Aktiebolag | Method and apparatus for measurement of total flow rate in ventilation installations |
US6241463B1 (en) * | 1997-06-23 | 2001-06-05 | Babcock-Bsh Gmbh | Method for determining the operating level of a fan and fan |
DE19851523C1 (en) * | 1998-11-09 | 2000-05-18 | Gauting Gmbh Apparatebau | Fan for compressible delivery medium has arrangement for deriving volume flow from pressure, temperature and rotor speed measurement values |
WO2004072455A2 (en) * | 2003-02-07 | 2004-08-26 | Varidigm Corporation | Pressure sensing system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10982850B2 (en) * | 2018-05-31 | 2021-04-20 | Exodraft a/s | Flow measurement system |
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