EP2775223B1 - Air supply nozzle - Google Patents

Air supply nozzle Download PDF

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Publication number
EP2775223B1
EP2775223B1 EP14156908.7A EP14156908A EP2775223B1 EP 2775223 B1 EP2775223 B1 EP 2775223B1 EP 14156908 A EP14156908 A EP 14156908A EP 2775223 B1 EP2775223 B1 EP 2775223B1
Authority
EP
European Patent Office
Prior art keywords
supply air
air nozzle
partition walls
nozzle
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.)
Active
Application number
EP14156908.7A
Other languages
German (de)
French (fr)
Other versions
EP2775223A3 (en
EP2775223A2 (en
Inventor
Christer Grönlund
Sami Grönlund
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laminix Oy
Original Assignee
Laminix Oy
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Filing date
Publication date
Application filed by Laminix Oy filed Critical Laminix Oy
Publication of EP2775223A2 publication Critical patent/EP2775223A2/en
Publication of EP2775223A3 publication Critical patent/EP2775223A3/en
Application granted granted Critical
Publication of EP2775223B1 publication Critical patent/EP2775223B1/en
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Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F24F13/081—Air-flow control members, e.g. louvres, grilles, flaps or guide plates for guiding air around a curve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/46—Air flow forming a vortex

Definitions

  • This invention relates to a supply air nozzle which is intended to be installed in the sleeve of a supply air duct and through which supply air is discharged into a room, and which supply air nozzle has several chambers.
  • Offices, classrooms, negotiation and meeting rooms often contain a large number of people relatively densely packed into the same space. This large number of people in the same space necessitates, in terms of temperature and comfort, that the amount of ventilation supply air (qv) must be increased to such an extent that the temperature and comfort at least remain at the level required by the building regulations.
  • the supply air amount regulations are not met if the air flow speed in an occupied area exceeds 0.2 m/s.
  • the occupied area of a room is usually defined as an area extending from a height of 0.1 m above the floor to a height of 1.8 m above the floor, i.e as the area occupied by the people.
  • a large amount of supply air into a space which is small in proportion to the number of people often causes high flow speeds in the occupied area which is sensed as an uncomfortable draft by the occupants.
  • the most common air distribution solutions are: a low-velocity unit, ceiling or wall diffuser, chilled beam or a supply air duct.
  • the low-velocity units which are installed at the floor level, require, in addition to the physical floor space, a lot of floor space, a so-called protective distance, for the air flows discharged by the diffusers.
  • the throw lengths of the ceiling and wall diffusers usually exceed the dimensions of the space, i.e. the air flow continues along the wall, down to the floor.
  • the chilled beams are primarily used for cooling offices and similar premises. Their air flow is not sufficient to meet the minimum air amount requirement of these premises.
  • the supply air duct is intended to evenly distribute the supply air evenly within the space.
  • the discharge sleeve of the supply air duct can be perforated, the sleeve of the supply air duct can have projecting jets or the supply air duct can be provided with supply air nozzles.
  • the above-mentioned supply air duct solutions share in common an excessive throw length as well as a poor supply air/indoor air mixing ratio.
  • the excessive throw length results in more or less the same problems as the above-described ceiling and wall diffusers.
  • the temperature of the supply air (qv) being lower than the temperature of the indoor air, the poor supply air (qv)/indoor air mixing ratio usually causes the supply air flow to make, after the discharge outlet, a tight turn towards the occupied area.
  • DE 10 2010 001811 discloses a supply air nozzle upon which the preamble of appending claim 1 is based.
  • the supply air duct according to the invention has several supply air nozzles serving to eliminate the above-mentioned disadvantages.
  • the supply air nozzle according to the invention is intended to be installed in the sleeve of a supply air duct and through which supply air is discharged into a room, and which supply air nozzle has several chambers, whereby the supply air nozzle is divided into chambers by one or more partition walls wind upwards round a central shaft, which partition walls of the supply air nozzle extend from an inlet to a discharge outlet in the form of a spiral, and wherein the body of the supply air nozzle forms a stepped structure, wherein the shape of the body, and the upward-spiraling partition walls divide the supply air flow into partial air flows.
  • the actual invention lies in the structure of the supply air nozzle wherein the interior is, in an especially preferred embodiment, divided into two, three or more sections or chambers separated from each other by partition walls forming an angle which is equally divided depending on the number of the partition walls. In practice, it has been found to be preferable to divide the supply air nozzle into three sections or chambers but the number of the chambers can also be higher or lower.
  • the partition walls of the supply air nozzle are in the shape of an upward spiral, with each partition wall winding, in the direction of the air flow, round the central shaft over an angle of approximately 120°.
  • the pitch angle and length of the upward partition wall spiral can be lower or higher.
  • the partition wall pitch angle can also be adjustable for an optimal result.
  • the upward-spiraling partition walls make the air flows passing through the supply air nozzle rotate intensively, resulting in that the supply air (qv), under the influence of the centrifugal force, effectively is blended into the indoor air, immediately after the discharge outlet of the supply air nozzle.
  • the negligible temperature difference between the supply and indoor air ensures that the supply air (qv) under no conditions turns downwards, in the direction of the occupied area.
  • the throw length of the supply air becomes considerably smaller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)
  • Jet Pumps And Other Pumps (AREA)

Description

  • This invention relates to a supply air nozzle which is intended to be installed in the sleeve of a supply air duct and through which supply air is discharged into a room, and which supply air nozzle has several chambers.
  • Offices, classrooms, negotiation and meeting rooms often contain a large number of people relatively densely packed into the same space. This large number of people in the same space necessitates, in terms of temperature and comfort, that the amount of ventilation supply air (qv) must be increased to such an extent that the temperature and comfort at least remain at the level required by the building regulations. The supply air amount regulations are not met if the air flow speed in an occupied area exceeds 0.2 m/s. The occupied area of a room is usually defined as an area extending from a height of 0.1 m above the floor to a height of 1.8 m above the floor, i.e as the area occupied by the people. A large amount of supply air into a space which is small in proportion to the number of people, often causes high flow speeds in the occupied area which is sensed as an uncomfortable draft by the occupants.
  • The most common air distribution solutions are: a low-velocity unit, ceiling or wall diffuser, chilled beam or a supply air duct. The low-velocity units, which are installed at the floor level, require, in addition to the physical floor space, a lot of floor space, a so-called protective distance, for the air flows discharged by the diffusers. The throw lengths of the ceiling and wall diffusers usually exceed the dimensions of the space, i.e. the air flow continues along the wall, down to the floor. The chilled beams are primarily used for cooling offices and similar premises. Their air flow is not sufficient to meet the minimum air amount requirement of these premises. The supply air duct is intended to evenly distribute the supply air evenly within the space. The discharge sleeve of the supply air duct can be perforated, the sleeve of the supply air duct can have projecting jets or the supply air duct can be provided with supply air nozzles. The above-mentioned supply air duct solutions share in common an excessive throw length as well as a poor supply air/indoor air mixing ratio. The excessive throw length results in more or less the same problems as the above-described ceiling and wall diffusers. The temperature of the supply air (qv) being lower than the temperature of the indoor air, the poor supply air (qv)/indoor air mixing ratio usually causes the supply air flow to make, after the discharge outlet, a tight turn towards the occupied area. DE 10 2010 001811 discloses a supply air nozzle upon which the preamble of appending claim 1 is based.
  • The supply air duct according to the invention has several supply air nozzles serving to eliminate the above-mentioned disadvantages.
  • The supply air nozzle according to the invention is intended to be installed in the sleeve of a supply air duct and through which supply air is discharged into a room, and which supply air nozzle has several chambers, whereby the supply air nozzle is divided into chambers by one or more partition walls wind upwards round a central shaft, which partition walls of the supply air nozzle extend from an inlet to a discharge outlet in the form of a spiral, and wherein the body of the supply air nozzle forms a stepped structure, wherein the shape of the body, and the upward-spiraling partition walls divide the supply air flow into partial air flows.
  • The dependent claims describe different embodiments of the invention.
  • The partition walls of the supply air nozzle project into the air flow of the supply air duct and turn the air flow of the supply air duct into several equally sized and evenly distributed partial supply air flows leaving the supply air duct at an angle of 90° relative to the flow direction of the supply air duct. While a part of the air flow of the supply air duct hits a partition wall of the supply air nozzle, its movement parallel to the main air flow stops and the dynamic pressure of the air flow is becomes a static pressure in the inlet of the supply air nozzle. Thus, the air flows passing through the supply air nozzles disposed in the supply air duct are equal because Ptot = Pstat = the same pressure in each supply air nozzle.
  • The actual invention lies in the structure of the supply air nozzle wherein the interior is, in an especially preferred embodiment, divided into two, three or more sections or chambers separated from each other by partition walls forming an angle which is equally divided depending on the number of the partition walls. In practice, it has been found to be preferable to divide the supply air nozzle into three sections or chambers but the number of the chambers can also be higher or lower.
  • The partition walls of the supply air nozzle are in the shape of an upward spiral, with each partition wall winding, in the direction of the air flow, round the central shaft over an angle of approximately 120°. The pitch angle and length of the upward partition wall spiral can be lower or higher. The partition wall pitch angle can also be adjustable for an optimal result. The upward-spiraling partition walls make the air flows passing through the supply air nozzle rotate intensively, resulting in that the supply air (qv), under the influence of the centrifugal force, effectively is blended into the indoor air, immediately after the discharge outlet of the supply air nozzle. The negligible temperature difference between the supply and indoor air ensures that the supply air (qv) under no conditions turns downwards, in the direction of the occupied area. As the above-described rotational motion of the air flow eliminates the straight forward directed kinetic energy in the air flow, the throw length of the supply air becomes considerably smaller.
  • The other aspects and the advantages related to them will appear from the following description of a few embodiments. The description is accompanied by the enclosed drawings.
    • Figure 1 shows the discharge outlet (7) of a supply air nozzle (1) according to the invention. The supply air nozzle (1) has three partition walls (2a, 2b and 2c) in the shape of an upward spiral and forming an angle 120° relative to each other.
    • Figure 2a show the inlet (8) of a supply air nozzle (1) according to the invention. The partition walls (2a, 2b and 2c) of the supply air nozzle (1) wind round a central shaft (3) in an upward spiral over an angle of approximately 120°, thus forming three chambers (4).
    • Figure 3 is a side-view of a supply air nozzle (1) according to the invention. The body (9) of the supply air nozzle (1) is stepped (10). The ring (5) of the supply air nozzle is shaped to match the curvature of the sleeve of a round supply air duct (6).
    • Figure 4 shows the inlet (8) of a supply air nozzle (1) according to the invention seen from the direction of the main air flow. The partition walls (2a, 2b and 2c) open the chambers (4) of the supply air nozzle for the main air flow. The stepped (10) structure of the body (9), and the partition walls (2a, 2b and 2c), evenly distribute the supply air flow to the chambers (4), into partial air flows.
    • Figure 5 shows a supply air duct (6) provided with several supply air nozzles (1) according to the invention.
    • Figure 6 is a three-dimensional view of a supply air duct (6) provided with supply air nozzles (1) according to the invention.
    • Figure 7 is a three-dimensional view of a supply air duct (6) where a supply air nozzle (1) divides the supply air flow (qv) into partial air flows.
    • Figure 8 shows a supply air nozzle (1) according to the invention, having an air flow deflector (11) in front of the discharge outlet.
    • Figure 9 shows a supply air nozzle (1) according to the invention, only provided with a laterally (12) opened, tangential inlet in the body (9).
    • Figure 10 shows a supply air nozzle (1) according to the invention wherein the pitch angle of the upward spiral of the partition walls (2) can be lower or higher.

Claims (5)

  1. A supply air nozzle intended to be installed in the sleeve of a supply air duct and through which supply air is discharged into a room, and which supply air nozzle has several chambers, whereby the supply air nozzle (1) is divided into chambers by one or more partition walls (2) wind upwards round a central shaft (3), which partition walls (2) of the supply air nozzle (1) extend from an inlet (8) to a discharge outlet (7) in the form of a spiral, and characterized in that the body of the supply air nozzle forms a stepped structure, wherein the shape of the body, and the upward-spiraling partition walls divide the supply air flow (qv) into partial air flows.
  2. The supply air nozzle according to claim 1, characterized in that the pitch angles and/or lengths of the upward-spiraling partition walls (2) are adjustable.
  3. The supply air nozzle according to any preceding claim, characterized in that the body (9) of the supply air nozzle (1) only has a lateral opening, and the body (9) of the supply air nozzle (1) forms a stepped (12) structure.
  4. The supply air nozzle according to any preceding claim characterized in that said supply air nozzle further comprising a ring (5) covering an opening made in a supply air duct (6), wherein the curvature of the ring (5) of the supply air nozzle (1) follows the curvature of the sleeve of a round supply air duct.
  5. The supply air nozzle according to any preceding claim characterized in that the central shaft (3) of the supply air nozzle (1) has a tubular structure to which a supply air deflector (11) can fixed by means of a pin, for example.
EP14156908.7A 2013-03-05 2014-02-27 Air supply nozzle Active EP2775223B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20135206A FI127419B (en) 2013-03-05 2013-03-05 Supply air nozzle

Publications (3)

Publication Number Publication Date
EP2775223A2 EP2775223A2 (en) 2014-09-10
EP2775223A3 EP2775223A3 (en) 2018-03-14
EP2775223B1 true EP2775223B1 (en) 2020-04-29

Family

ID=50238127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14156908.7A Active EP2775223B1 (en) 2013-03-05 2014-02-27 Air supply nozzle

Country Status (3)

Country Link
EP (1) EP2775223B1 (en)
DK (1) DK2775223T3 (en)
FI (1) FI127419B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109654711B (en) * 2018-11-12 2020-09-15 武城县冠智信息产业技术有限公司 Planet wheel type air outlet air adjusting device and air adjusting method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170930A (en) * 1976-12-09 1979-10-16 Lind Leif Ingemar Screen for improving the environment of a workplace having a plurality of working areas
DE29914962U1 (en) * 1999-08-26 1999-10-14 Bermes Peter Air outlet, especially for automotive ventilation
DE202006006597U1 (en) * 2006-04-25 2006-07-27 Dr. Schneider Engineering Gmbh Air nozzle, in particular, for guiding an air stream in ventilation and air-conditioning units in motor vehicles comprises a twister unit with a central body carrying twister elements
DE102008033339A1 (en) * 2008-07-16 2010-01-21 Behr Gmbh & Co. Kg Air vents with swirl flow and directed flow
DE102010001811B4 (en) * 2010-02-11 2019-05-16 Mahle International Gmbh Air vents and motor vehicle air conditioning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2775223A3 (en) 2018-03-14
DK2775223T3 (en) 2020-07-27
FI127419B (en) 2018-05-31
FI20135206A (en) 2014-09-06
EP2775223A2 (en) 2014-09-10

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