WO2012030210A1 - Unité de distribution d'air pour la fourniture d'air à un espace - Google Patents

Unité de distribution d'air pour la fourniture d'air à un espace Download PDF

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Publication number
WO2012030210A1
WO2012030210A1 PCT/NL2011/050119 NL2011050119W WO2012030210A1 WO 2012030210 A1 WO2012030210 A1 WO 2012030210A1 NL 2011050119 W NL2011050119 W NL 2011050119W WO 2012030210 A1 WO2012030210 A1 WO 2012030210A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
distribution unit
channel
space
air distribution
Prior art date
Application number
PCT/NL2011/050119
Other languages
English (en)
Inventor
Sander Baars
Achim Martin Numan
Original Assignee
Barcol - Air B.V.
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 Barcol - Air B.V. filed Critical Barcol - Air B.V.
Publication of WO2012030210A1 publication Critical patent/WO2012030210A1/fr

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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/01—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station in which secondary air is induced by injector action of the primary air
    • 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
    • F24F2221/14—Details or features not otherwise provided for mounted on the ceiling

Definitions

  • Air distribution unit for supplying air to a space
  • the invention relates to an air distribution unit for supplying air to a space, which air distribution unit comprises at least one nozzle and an induction chamber to which fresh air is to be supplied along an inner wall of the induction chamber by means of said nozzle, which air is to be mixed with air from said space, which air from said space is to be supplied to the induction chamber through a passage in the air distribution unit, the induction chamber being provided with an air guiding element opposite said nozzle, by means of which a channel is formed in which the fresh air and the air from said space is to be mixed and/or the already mixed air is to be supplied to the space via a gap forming the outlet of said channel, said channel being provided, on the side directed toward the induction chamber, with a projection that forms an extension of the channel.
  • Such an air distribution unit is known from Australian patent document AU2002313921.
  • an embodiment is shown, for example in figure 4, in which the two nozzles are directed toward the inlets of two channels.
  • An inlet is formed by an inner wall of the induction chamber, indicated at 26, and an air guiding element in the form of a part of the grate shown in figure 3, which is provided with a projection.
  • Said projection is formed by a kink, which extends parallel to the vertical, at the end of the air guiding element, on the side directed toward the induction chamber.
  • a drawback of an air guiding element having such configuration is that the flow of air from said space, which is referred to as "secondary air" in figure 4 of AU2002313921 , into the channel is impeded by the kink of the projection, so that the air to be supplied to the space via said channel is poorly mixed, if at all.
  • the position of the nozzle located near the inner wall relative to the nozzle located near the inlet of the secondary air is not conducive to obtaining a good mixture of fresh air with secondary air in the channel located near the inner wall, whilst in the other channel remote from the inner wall a good mixture of the fresh air with secondary air is not obtained, either, on account of the absence of the inner wall and the Coanda effect provided thereby.
  • the projection has a radiussed end and, joining said end, two projection walls extending parallel to each other, which projection walls extend parallel to a virtual axis extending between the two channel walls forming the channel, such that a channel wall not exhibiting a kink is formed by means of a first projection wall, whilst a second projection wall is directed toward the passage.
  • a first outer wall of the projection forms an inner wall part of the channel which merges with the rest of the inner wall of the channel without any kinks, so that the air, once it has reached the channel, need not pass any "kinks" between the channel inlet and the channel outlet.
  • the fresh air that is blown into the induction chamber and the channel inlet by means of the nozzle can thus provide an optimum underpressure, which draws in the air from the passage.
  • the second projection wall is configured to extend parallel to the first projection wall, it is oriented toward the passage, so that at least part of the air from the passage is optimally directed into the channel via the second projection wall, over the round end of the projection.
  • the projection forms the channel inlet, which, on account of the configuration of the projection, forms a constriction.
  • Said constriction produces a Venturi effect, and the underpressure created by the Venturi effect provides a higher suction power, so that air from the space, hereinafter called space air, is drawn in more effectively.
  • the noise produced above the channel in the air distribution unit can hardly reach the space via the channel.
  • the noise essentially disappears via the passage, so that the air distribution unit according to the present invention makes it possible to realise a minimum noise production in the space, which in turn has an advantageous effect as regards the maximum capacity of the air distribution unit, since said capacity is essentially limited by the regulations concerning the maximum noise production, measured in the space, with which the air distribution unit must comply in use.
  • One embodiment of the air distribution unit according to the present invention is characterised in that the inner wall of the induction chamber merges with the channel wall via a radiussed curved portion.
  • Another embodiment of the air distribution unit according to the present invention is characterised in that the nozzle includes an angle of 5-15 degrees with the adjoining inner wall of the induction chamber, such that the fresh air can be blown in the direction of the channel inlet by means of the nozzle.
  • Yet another embodiment of the air distribution unit according to the present invention is characterised in that the virtual axis includes an angle of 55-70 degrees with a vertical.
  • Such a channel aligned relative to the vertical provides a specific distribution of the air in the air distribution unit.
  • the velocity of the air that flows past the projection into the channel is relatively low in comparison with that of the fresh air from the nozzle.
  • the air blown into the channel by means of the nozzle is pressed against the channel wall as a result of the strong curvature of the channel wall, as a result of which the velocity of said air is reduced and the air flow is elongated in the longitudinal direction of the air distribution unit, whilst a kind of "zip merging", read mixing, of the two air flows can take place in the channel, so that an optimally mixed air flow can exit the elongated gap that forms the channel outlet and enter the space, which air flow is moreover pleasant to users of the space.
  • a homogeneous air velocity in the longitudinal direction has the advantage that it prevents the formation of an interval pattern of dirt in the longitudinal direction, which is a well-known phenomenon that occurs after a certain period of use with known air distribution units, with a streak of dirt in the longitudinal direction showing up every so many centimetres owing to the presence of the nozzles disposed in a row in the longitudinal direction of the known air distribution unit, because a homogeneous air velocity in the longitudinal direction is not achieved.
  • the homogeneity of the air velocity in the longitudinal direction is realised by the Coanda effect of the fresh air flow from the nozzle, as well as by the curvature of the channel relative to the inner wall of the induction chamber, as a result of which the air in the channel is distributed even further over the channel wall in the longitudinal direction of the air distribution unit.
  • the air having the highest velocity flows on the side of the channel wall that is formed by the internal part, whilst the velocity of the air flowing past the air guiding element is relatively low.
  • the higher- velocity air on the channel wall side will therefore encounter the highest inhibiting effect from the space air present in the space, which has the advantage that the higher-velocity air will more rapidly mix with the space air, which has a positive effect on the temperature gradient through the space.
  • the Coanda effect already occurs at very low air velocities, on account of the angle at which the channel extends relative to the vertical, so that the air exiting the gap will not be directly deflected downward even if a minimum amount of air is blown into the space.
  • Another embodiment of the air distribution unit according to the present invention is characterised in that the inner wall includes an angle of less than 10 degrees with the vertical near the nozzle.
  • the air flow from the nozzle can be directed at a larger angle relative to the vertical, so that the position of the maximum underpressure in the induction chamber / the channel can be varied without the effect of adherence to the inner wall being lost.
  • Yet another embodiment of the air distribution unit according to the present invention is characterised in that a conditioning device is disposed in the passage for conditioning the air from the space.
  • the conditioning device which may comprise a heat exchanger or the like, the air to be supplied to the space can be more adequately adapted to the requirements of the users of the space.
  • the conditioning device may even be provided with sensors, such as a C0 2 sensor, for example, by means of which the quality of the air in the space can be monitored and be controlled more adequately by varying the amount of fresh air in relation to the space air.
  • the supply of additional fresh air takes place by blowing in fresh air above the ceiling in front of the passage. Said fresh air is drawn into the air distribution unit via the passage at least partially instead of the space air and, mixed with the fresh air from the nozzles, blown into the space.
  • the advantage of this method is that the total amount of mixed air supplied via the gap does not vary and consequently the air displacement in the space remains constant, so that there will be no draught.
  • the degree of comfort remains unchanged, as it were, whilst the C0 2 concentration in the space can be reduced.
  • the air distribution unit is characterised in that the air distribution unit is designed as a modular unit, in which use is made of detachable snap connections, wherein the nozzle or a nozzle unit comprising several nozzles can be detachably snapped to the internal part forming part of the inner wall of the induction chamber in a fluid-tight manner and be unsnapped therefrom.
  • the modular structure and an advantageous, relatively flexible choice of material, such as plastic for the internal part, for example, several configurations of the same parts can be realised. Variations in length can be realised in a simple manner, but it is also possible to realise a unit that blows in air from two, three or four sides.
  • the passage is larger as regards its cross-sectional area than the channel inlet, preferably at least twice as large.
  • the passage that is available for supplying space air By designing the passage that is available for supplying space air to be relatively large in comparison with the channel inlet, it is possible to drawn a large amount of space air in spite of the fact that the air distribution, on account of the absence of pumping means, consumes little energy in use. Because of the specific configuration of the projection, in particular the inclination of the second projection wall, it is even possible to further maximise the area of the passage, in particular in vertical direction. The smaller the passage, the more this constitutes an impediment as regards the amount of air that can be drawn in.
  • the air distribution unit according to the present invention has been designed to provide the largest possible passage for the air to be drawn in, since more space air (secondary air) directly means more capacity when said air is passed through a heat exchanger. Furthermore, the noise produced above the channel will be principally discharged via the relatively large passage, thus strongly decreasing any noise nuisance from the air distribution unit in the space.
  • Figure 1 is a sectional view of an air distribution unit according to the present invention in use
  • Figure 2 is a perspective view of the internal parts of an air distribution unit according to the present invention.
  • Figure 3 is a sectional view of an alternative embodiment of the air distribution unit according to the present invention in use
  • Figure 1 shows a sectional view of an air distribution unit 1 according to the present invention.
  • the longitudinal direction of the air distribution unit according to the present invention extends transversely to the plane of the drawing.
  • the air distribution unit 1 according to the present invention supplies air to a space 2, which air is essentially made up of two components; the first component is fresh air and the second component is air from the space itself, which latter air may be conditioned, if desired.
  • the air distribution unit 1 according to the present invention forms part of an air conditioning system of a building.
  • the air distribution unit 1 may be placed in a ceiling space 3 present between the ceiling (not shown) and a suspended ceiling 5 as shown in figure 1 , or in a space under a floor (not shown) of a building.
  • the air distribution unit 1 comprises a number of nozzles 7 arranged in a row (not shown) extending in the longitudinal direction of the air distribution unit, and air chamber 1 , by means of which the fresh air is distributed over the nozzles 7, an induction chamber 10 in which fresh air is mixed with air from the space 2, a passage 1 through which space air 13 being drawn from said space by means of the underpressure generated in the air distribution unit is to be supplied to the induction chamber 10, as well as an air guiding element 15 for guiding the air into the space 2.
  • the suspended ceiling 5 is provided with grates (not shown), for example, through which the space air can flow into the space above the suspended ceiling 5.
  • the induction chamber 10 is made up of an internal part 17, which is shown, also in perspective view, in figure 2, of the air guiding element 15 and of the frame housing 21.
  • Fresh air is to be supplied from the air chamber 9, along an inner wall 23 formed by the internal part 17 of the induction chamber 0, by the nozzles 17 and to be mixed with air 13 from the space 2, which space air 13 is to be supplied to the induction chamber through a passage 1 of the air distribution unit 1 .
  • Disposed diagonally opposite the nozzles is the air guiding element 15, by means of which a channel 30 is formed, in which channel the fresh air and the air 13 are to be mixed and/or the air already mixed in the induction chamber 10 is to be supplied to the space 2 via a gap 31 forming the channel outlet.
  • the channel 30 On the side directed toward the induction chamber 10, the channel 30 is provided with a projection 35 that forms an extension of the channel 30, which projection is clearly illustrated in a dotted line in figure 1.
  • the projection 35 formed by the air guiding element 15 has a radiussed end 37 and two parallel projection walls 39, 41 joining said radiussed end.
  • Said projection walls 39, 41 extend parallel to a virtual axis 43, which is located between the two channel walls 44, 45 forming the channel 30, such that a channel wall 44 not exhibiting a kink is formed by a first projection wall 41 , whilst a second projection wall 39 is directed toward the passage 11.
  • the channel wall 44 is made up of the guide element 15.
  • the inner wall 23 of the induction chamber 10 blends with the channel wall 45 via a radiussed curved portion.
  • Said channel wall 45 is formed by the internal part 17.
  • the channel 30 is extended but the air, having reached the channel 30, need not pass through any "kinks" between the inlet (illustrated in a dotted line 47) of the channel 30 and the gap-like outlet 31.
  • the fresh air that is blown into the induction chamber 10 and into the inlet (illustrated in a dotted line 47) of the channel 30 by means of the nozzles 7 can thus provide an optimum underpressure near said inlet, drawing in the air that is being supplied through the passage 11. The higher the velocity at which the fresh air is blown into the space by means of the nozzle 7, the greater the underpressure that is created.
  • the second projection wall 39 extend parallel to the first projection wall 41 , said second projection wall is directed toward the passage 11 , so that at least part of the air being supplied through the passage is optimally led into the channel 30 via the second projection wall 39, over the radiussed end 37 of the projection 35.
  • this configuration of the projection 35 makes it possible to use a larger passage 11 , so that the air distribution unit 1 does not require any pumping devices or the like for drawing in the space air via the passage 11 , making use of the underpressure provided in the air distribution unit 1.
  • the relatively large passage 11 makes it possible to maintain a relatively low air velocity above the suspended ceiling 5, so that the space air drawn in through the passage will be relatively clean, since the dirt particles "precipitate" on the ceiling 5, as it were.
  • the nozzles 7 include an angle a of about 8 degrees with the adjoining inner wall 23 of the induction chamber 10, such that the fresh air can be blown in the direction of the channel inlet (illustrated in a dotted line 47) formed between the radiussed end 37 of the projection 35 and the inner wall 23 / channel wall 45 by means of the nozzles 7.
  • the inner wall 23 moreover includes an angle ⁇ of 2 degrees with the vertical 50 near the nozzle.
  • the virtual axis 43 of the channel 30 includes an angle U of 62 degrees with a vertical 50.
  • the air flowing past the projection 35 flows into the channel 7 at a relatively low velocity in comparison with the fresh air from the nozzle 7. Due to the strong curvature of the channel wall 45, the air being blown into the channel 30 by means of the nozzle 7 is forced against said inner wall 45, as a result of which the velocity of said air is reduced and the air is extended and distributed in the longitudinal direction of the air distribution unit.
  • a conditioning device 60 is installed in the passage 1 1 for conditioning the space air 13, which conditioning device may comprise a heat exchanger but also sensors, for example, which make it possible to adapt the air to be supplied to the space 2 better to the requirements of the users of said space 2.
  • the temperature of the space air 13 to be supplied to the induction chamber can be controlled in a known manner, for example.
  • the internal part 17 as well as the nozzles are essentially made of plastic material, which is advantageous not only for weight reasons but also in connection with the noise produced by the air distribution unit 1 in use, which in turn has an advantageous effect as regards the maximum capacity of the air distribution unit 1 , since said capacity is essentially limited by the noise regulations with which the air distribution unit 1 must comply in use.
  • the guiding element 15 is preferably made of aluminium.
  • an aluminium section 54 which, together with the guide element, forms the outlet 31 , is mounted over the plastic internal part 17. Aluminium is wear-resistant and shape-retaining, and its use is desirable for design reasons.
  • figure 2 shows a perspective view of the internal part 17 of the air distribution unit.
  • a nozzle unit (not shown) comprising four nozzles 7 can be mounted, using a snap connection.
  • an air distribution unit 1 of modular design is provided.
  • Figure 3 shows an alternative embodiment of the air distribution unit 100 according to the present invention, which is also installed in a suspended ceiling 5.
  • the air distribution unit 100 is different from the air distribution unit 1 in two essential points, the other features of the air distribution unit 100 are practically identical, and consequently they are not provided with reference numerals in figure 3 and will not be discussed again.
  • the air distribution unit 100 is provided with an additional passage
  • a variable additional amount of fresh air can be blown into the induction chamber through said additional passage. Said fresh air is drawn into the induction chamber of the air distribution unit instead of space air 13 and mixed with the remaining space air that is being drawn into the induction chamber. Following this, said mixture of fresh air and space air is blown into the space 2, using fresh air from the nozzles.
  • the total amount of air that is blown into the space 2 preferably does not change, so that, on account of the fresh air being obtained from the supplying device 123, less space air 13 needs to be drawn in, which may decrease the extent to which draught is being perceived by a user of the space, since a smaller volume of space air is needed, which draught in fact depends on the desired volume of air per unit time that is blown into the space 2 via the channel. In the case of small volumes, said draught will be less than in the case of large volumes.
  • the air distribution unit 100 further comprises a passage 11 1 which is different from the passage 1 1 shown in figure 1.
  • the fact is that the passage 111 is bounded by a flange 40 of a guiding element 115.
  • Said flange 40 forms the bottom side of the passage 111 , and said flange 40 extends at a small angle of inclination of 1 - 10 degrees relative to the horizontal, so that, seen from the induction chamber, the flange 40 slopes down toward the outside at said angle of inclination.
  • the flange 40 furthermore has a spherical end 42. Condensation formed on the heat exchanger 6 when the temperature is below the dew point can be discharged to the outside, i.e. not to the induction chamber, in a sound manner to an optional condensation collector (not shown), which condensation collector can be placed under the flange 40 and via which the condensation can be discharged.
  • the air distribution unit 1 according to the invention is preferably square in section (as shown in figure 1 ), having a height of about 25 cm, a width of about 25 cm and a length of about 1 m.
  • the air distribution unit 1 according to the invention is also capable of blowing air into a space 2 in more than one direction, for example by arranging two or more gaps forming the outlet at an angle of, for example, 90 degrees.

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

Abstract

L'invention porte sur une unité de distribution d'air pour la fourniture d'air à un espace, laquelle unité de distribution d'air comprend au moins une buse et une chambre d'induction à laquelle de l'air frais doit être fourni le long d'une paroi interne de la chambre d'induction au moyen de ladite buse, lequel air doit être mélangé avec l'air provenant dudit espace, lequel air provenant dudit espace doit être fourni à la chambre d'induction à travers un passage dans l'unité de distribution d'air, la chambre d'induction comportant un élément de guidage d'air opposé à ladite buse, au moyen duquel est formé un canal dans lequel l'air frais et l'air provenant dudit espace doivent être mélangés et/ou l'air déjà mélangé doit être fourni à l'espace par l'intermédiaire d'un espace formant la sortie dudit canal, ledit canal comportant, sur le côté dirigé vers la chambre d'induction, une saillie qui forme une extension du canal.
PCT/NL2011/050119 2010-08-31 2011-02-18 Unité de distribution d'air pour la fourniture d'air à un espace WO2012030210A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2005294A NL2005294C2 (nl) 2010-08-31 2010-08-31 Luchtverdeeleenheid voor het toevoeren van lucht tot in een ruimte.
NL2005294 2010-08-31

Publications (1)

Publication Number Publication Date
WO2012030210A1 true WO2012030210A1 (fr) 2012-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2011/050119 WO2012030210A1 (fr) 2010-08-31 2011-02-18 Unité de distribution d'air pour la fourniture d'air à un espace

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NL (1) NL2005294C2 (fr)
WO (1) WO2012030210A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240521A (en) * 1967-08-24 1971-07-28 Ltg Lufttechnische Gmbh Air conditioner
WO2000028263A1 (fr) * 1998-11-05 2000-05-18 Teknoterm Climate Ab Appareil de climatisation
WO2002042691A1 (fr) * 2000-11-24 2002-05-30 Halton Oy Dispositif terminal d'alimentation en air
AU2002313921B2 (en) 2001-12-06 2008-07-17 Mestek, Inc Induction Diffuser
WO2009050129A1 (fr) * 2007-10-19 2009-04-23 Roccheggiani S.P.A. Elément d'induction pour une diffusion d'air froid et chaud, doté à l'intérieur de soupapes d'alimentation en air réglables

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240521A (en) * 1967-08-24 1971-07-28 Ltg Lufttechnische Gmbh Air conditioner
WO2000028263A1 (fr) * 1998-11-05 2000-05-18 Teknoterm Climate Ab Appareil de climatisation
WO2002042691A1 (fr) * 2000-11-24 2002-05-30 Halton Oy Dispositif terminal d'alimentation en air
AU2002313921B2 (en) 2001-12-06 2008-07-17 Mestek, Inc Induction Diffuser
WO2009050129A1 (fr) * 2007-10-19 2009-04-23 Roccheggiani S.P.A. Elément d'induction pour une diffusion d'air froid et chaud, doté à l'intérieur de soupapes d'alimentation en air réglables

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Publication number Publication date
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