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 PDF

Info

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
Application number
PCT/DK2010/000103
Other languages
French (fr)
Inventor
Svend Morsing
Original Assignee
Skov A/S
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Skov A/S filed Critical Skov A/S
Publication of WO2011009458A1 publication Critical patent/WO2011009458A1/en

Links

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; CARE OF BIRDS, FISHES, INSECTS; 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.

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

P A T E N T C L A I M S
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.
PCT/DK2010/000103 2009-07-23 2010-07-05 Method for determination of air flow, exhaust unit and its application WO2011009458A1 (en)

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
WO (1) WO2011009458A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10982850B2 (en) * 2018-05-31 2021-04-20 Exodraft a/s Flow measurement system

Citations (4)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10982850B2 (en) * 2018-05-31 2021-04-20 Exodraft a/s Flow measurement system

Similar Documents

Publication Publication Date Title
US6994620B2 (en) Method of determining static pressure in a ducted air delivery system using a variable speed blower motor
WO2009079421A3 (en) Control device for hvac systems with inlet and outlet flow control devices
EP1919271A3 (en) Air-conditioning installation and computer system
MY139904A (en) A method and apparatus for maintaining air characteristics in an air ventilated facility using fan filter units
WO2006099125A3 (en) Dynamic control of dilution ventilation in one-pass, critical environments
JP2007263962A5 (en)
CN107110524A (en) For the method for the operation for controlling HVAC system
JP7002680B2 (en) Control method of air conditioning equipment, control device, air conditioning equipment and storage medium
KR20200012175A (en) Air conditioning system of negative pressure type special facility
EP2623878A3 (en) Method and system for conditioning air
US7516649B2 (en) System and method for determining duct leakage and fan flow efficiency
JP6195380B2 (en) Environmental test system
WO2020059378A1 (en) Air conditioning device and method for controlling rotation speed of blower fan
CN107860533A (en) One kind is used for vehicle air conditioning outlet sealing and ventilation noise testing device
EP2363656A3 (en) Method for presetting a central ventilation system, presetting system and central ventilation system comprising a presetting system of this type
DE602006017738D1 (en) ANTRIEBSEINRÜCKVORRICHTUNG
WO2011009458A1 (en) Method for determination of air flow, exhaust unit and its application
CN207622949U (en) One kind is for vehicle air conditioning outlet leakproofness and ventilation noise testing device
Kettler Controlling minimum ventilation volume in VAV systems.
CN105444372B (en) A kind of air quantity control method of duct type indoor unit and duct type indoor unit
EP2096366A3 (en) Terminal apparatus, e.g. ceiling diffuser, of a ventilation system
EP3604960A3 (en) Fan control apparatus and fan control method
FR3097031B1 (en) indoor air quality control system
CN106927012A (en) Ship integration air quantity variable end device
KR101746519B1 (en) Virtual sensing system and method for building monitoring

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10801976

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 10801976

Country of ref document: EP

Kind code of ref document: A1