EP2503256A2 - An air inlet diffuser device, and a system including a building ceiling having one or more air inlet diffuser devices - Google Patents

An air inlet diffuser device, and a system including a building ceiling having one or more air inlet diffuser devices Download PDF

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Publication number
EP2503256A2
EP2503256A2 EP12160315A EP12160315A EP2503256A2 EP 2503256 A2 EP2503256 A2 EP 2503256A2 EP 12160315 A EP12160315 A EP 12160315A EP 12160315 A EP12160315 A EP 12160315A EP 2503256 A2 EP2503256 A2 EP 2503256A2
Authority
EP
European Patent Office
Prior art keywords
air
tubular part
free edge
air inlet
air guiding
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.)
Granted
Application number
EP12160315A
Other languages
German (de)
French (fr)
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EP2503256B1 (en
EP2503256A3 (en
Inventor
Søren Duval Byrgesen Larsen
Kim Jørgen Heide Kronby
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.)
JS Ventilation AS
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JS Ventilation AS
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Filing date
Publication date
Priority claimed from DKPA201100193A external-priority patent/DK177247B1/en
Application filed by JS Ventilation AS filed Critical JS Ventilation AS
Publication of EP2503256A2 publication Critical patent/EP2503256A2/en
Publication of EP2503256A3 publication Critical patent/EP2503256A3/en
Application granted granted Critical
Publication of EP2503256B1 publication Critical patent/EP2503256B1/en
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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
    • F24F13/068—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser formed as perforated walls, ceilings or floors
    • 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
    • F24F13/0227—Ducting arrangements using parts of the building, e.g. air ducts inside the floor, walls or ceiling of a building
    • 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
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F13/062—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser having one or more bowls or cones diverging in the flow direction

Definitions

  • the present invention relates an air inlet distributor or diffuser device, and a system including a building ceiling having one or more of the air inlet diffuser devices, the building ceiling being a suspended ceiling which defines a plenum.
  • Ventilation of office buildings etc. is normally performed to ensure a desired indoor climate in summer- and wintertime.
  • the aforementioned problems are solved by the present invention, at the same time providing a low resistance to the air flow with a consequential reduction in noise and energy consumption.
  • the k r value of the air inlet diffuser device resulting from the design of the device may be in the order of 3.72, yielding a long throw length as determined by formulae l 0,2 ⁇ k r ⁇ v o ⁇ ⁇ A o ⁇ k r ⁇ ⁇ (v o ⁇ q v ), where v o is the effective inflow velocity, A o is the effective inflow area, and q v is the volume flow.
  • Traditional air inlet diffuser devices have a k r value of less than half that. The design of the device ensures that air driven through the device will flow very closely against the lower side of the ceiling to a relatively large distance from the diffuser device, before losing energy leading to a downward flow of the air.
  • Fig. 1 shows schematically a ceiling system having no installations such as ventilating air ducts or cooling or heating pipes, the ceiling system having integrated air inlet diffuser devices 1.
  • the ceiling system is normally formed as a suspended ceiling C comprised by a plurality of individual four-sided plates P, such as metal, eg. aluminium, plates, each having an upper side US and a lower side LS.
  • the size of the plates P is selected according to the builder's specifications to obtain a desired visual appearance of the ceiling C; the plates P may, by way of example, be square with dimensions in the order of 1m x 1m.
  • the suspended ceiling may be mounted in a conventional manner below a fixed ceiling forming part of a building structure, to define a plenum or space S, and a fan drives air at a given temperature into this space S.
  • the plates P are delivered in standard sizes, and the suspended ceiling is constructed as a sealed structure such that air A will primarily flow from the space S through air inlet diffuser devices 1 to be discussed in further details below.
  • the plates P of the ceiling have an integral tubular part 5 of a respective air inlet diffuser device 1, the part 5 preferably being pressed out from the metal plates by a local deformation of a peripheral edge or rim of a through-going aperture previously made in the plate.
  • the tubular part 5 extends into the space S.
  • the air inlet diffuser device 1 is formed as a component that includes the aforementioned part 5 which is inserted into the through-going aperture.
  • the number and size of air inlet diffuser devices 1 is selected in accordance with the heat load, i.e. the amount of heat energy supplied as sunlight, by machinery, computers, people or lighting equipment to the building room or inside space (R) below the suspended ceiling.
  • an amount of cooling air to be supplied to the building room can be calculated using a PC-program.
  • the arrangement, dimensions and number of the air inlet diffuser devices 1 may be calculated using this PC-program.
  • the ceiling system may be used in any type of building where ventilation is required or desired.
  • the design or configuration of the air inlet diffuser device 1 is such that is may carry through large variations in the through-flow of air while still ensuring that the air exiting the device will "stick" to the lower side LS of the ceiling C; it will be understood that it is important to ensure that the air A flows as far as possible along and close to the lower side LS of the plates after exiting the device 1.
  • the present invention it is made possible to obtain the aforementioned desirable flow without the need for any regulating devices, i.e. without the need for any movable parts for setting and varying the size of the flow passage of the air inlet diffuser device 1, in that the device provides for a minimum flow resistance and, hence, a minimum noise and energy requirement while at the same time complying with current building codes.
  • the device factor k r may be in the order of 3.72, while traditional air inlet diffuser devices have a device factor k r of less than half.
  • the air inlet diffuser device 1 will in the following be discussed in further details, with reference to an embodiment where a part 5 thereof is a raised portion of the plates P, being pressed out from the plates P by a local deformation, such as by using a punching tool, of a peripheral edge or rim of a through-going aperture previously made in the plate.
  • the air inlet diffuser device 1 comprises as shown in fig. 2-4 a) an outer cylindrical tubular part 5 having an inside surface 5' and an upper free edge 8 to be located above the upper side US of the plates P and b) an inner elongated air guiding part 20 which is symmetrical about an axis of rotation 25, i.e. which may eg. have conical shape with the axis 25 parallel with the longitudinal axis of the tubular part 5.
  • the tubular part 5 has at the lowermost extremity thereof a first circumferential flange 12 with a lower surface 12'.
  • An even or uniform transition between the inner surface 5' of the tubular part 5 and the lower surface 12' is defined by a curved transition face 7.
  • the air guiding part 20 is mounted centrally within the cylindrical tubular part 5 such that the distance d2 to the tubular part 5 measured perpendicular to the axis of rotation 25 decreases uniformly in the direction from the upper free edge 8. This forms a converging flow passage 3 between the tubular part 5 and the air guiding part 20.
  • the air guiding part 20 extends farthest from the upper free edge 8 into a second circumferential flange 22 which together with the lower surface 12' forms a circumferential and horizontal air exit passage 2 for orienting air perpendicularly to the axis of rotation 25, i.e. parallel with or essentially parallel with the lower surface LS of the plate P.
  • the air guiding part 20 is fixed to the tubular part 5 so as to be immovable during use of the device 1 in the building.
  • the apex T of the air guiding part 20 is located at a distance d4 below the edge 8 corresponding to 25%-75%, or 40% - 60%, of a distance d3 between the first circumferential flange 12 and the upper free edge 8.
  • the circumferential passage 2 has no air flow restrictions and the tubular part 5 preferably has a circular cross-section of constant diameter.
  • the air guiding part 20 is located in its entirety below the free edge 8, giving rise to a very compact construction, while at the same time the tubular part 5 projects by a distance d3 into the space S above the upper side US of the plates P, to provide for a "bathtub-effect" where cold air at the upper side US of the plates P is heated, thereby rising upwards, after which this heated air passes through the air inlet diffuser device 1, as shown by the arrows in fig. 1 .
  • Figs. 2-4 show different designs of a transition area 20" between the air guiding part 20 and the circumferential flange 22, and of the air guiding part 20 as such.
  • the system preferably drives - essentially without any installations in the space or plenum S - the desired heating or cooling air to the room R.
  • the sub-cooled air having a temperature of eg. 13°C is - due to the temperature gradient - distributed across the upper side US of the plates P, and thereby brings about a cooling of the lower side LS of the plates P to a temperature of eg. 17°C, generating cooling radiation towards the room R.
  • the air inlet diffuser devices 1 of the invention establish a through flow of the sub-cooled air, the air flowing horizontally along the lower side LS of the plates, contributing to a further cooling of the room R.
  • the total cooling effect may eg. reach 100 W/m 2 floor area, which cannot be obtained with the devices currently on the market. A high level of comfort in the room R is maintained.
  • the ceiling system may be used in all types of buildings with a need for ventilation.
  • the shown solution where the part 5 is integral with the plates 5 is highly compact, allowing for the air to exit and flow very closely to the lower side LS of the plates 5; an alternative embodiment may be envisaged where the device 1 is designed with the aforementioned circumferential flange 12 configured to be secured to the plates P, the plates P in this embodiment being provided only with the aforementioned aperture with or without the raised portion discussed above.
  • the apertures formed in the plates 5 may have a diameter configured such that the diameter of the tubular part 5 is 160 mm when the raised portions are formed.
  • the plates 5 may be 0.5 mm aluminium plates, and distance d3 and d4 may be 200 mm and 80 mm, respectively.
  • a desired increased length d4 of the tubular part 5 may be obtained by placing a extension collar on top of the raised portion, the collar then defining the upper free edge of the tubular part 5.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Duct Arrangements (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The invention relates to an air inlet diffuser device (1) comprising a) an outer cylindrical tubular part (5) having an inside surface (5') and an upper free edge (8) and b) an inner elongated air guiding part (20) which is symmetrical about an axis of rotation (25).

Description

  • The present invention relates an air inlet distributor or diffuser device, and a system including a building ceiling having one or more of the air inlet diffuser devices, the building ceiling being a suspended ceiling which defines a plenum.
  • Ventilation of office buildings etc. is normally performed to ensure a desired indoor climate in summer- and wintertime.
  • Examples of an air inlet diffuser device and a suspended building ceiling with such an air inlet diffuser device are disclosed in W098/51 978 and US 3 403 614 .
  • It is a problem with the known air inlet diffuser devices that they must be designed with a mechanical build-in regulator or shutter to allow for a controlling of the amount of inflowing air; at the same time they do not ensure that the inflowing air "sticks" closely to the lower surface of the suspended ceiling. It is also a problem that the known air diffuser devices project from the lower side of the ceiling to a relatively large extend into the building space below the ceiling.
  • The aforementioned problems are solved by the present invention, at the same time providing a low resistance to the air flow with a consequential reduction in noise and energy consumption. The kr value of the air inlet diffuser device resulting from the design of the device may be in the order of 3.72, yielding a long throw length as determined by formulae l0,2 ≈ kr · vo · √Ao ≈ kr · √(vo · qv), where vo is the effective inflow velocity, Ao is the effective inflow area, and qv is the volume flow. Traditional air inlet diffuser devices have a kr value of less than half that. The design of the device ensures that air driven through the device will flow very closely against the lower side of the ceiling to a relatively large distance from the diffuser device, before losing energy leading to a downward flow of the air.
  • Further advantages and benefits of the invention will appear in the following description wherein reference is made to embodiments shown on the drawings wherein
    • Fig. 1 is an example of a system including a suspended ceiling according to the present invention, and
    • Fig. 2-4 show different embodiments of air diffuser devices for use in the suspended ceiling of fig. 1.
  • Fig. 1 shows schematically a ceiling system having no installations such as ventilating air ducts or cooling or heating pipes, the ceiling system having integrated air inlet diffuser devices 1. The ceiling system is normally formed as a suspended ceiling C comprised by a plurality of individual four-sided plates P, such as metal, eg. aluminium, plates, each having an upper side US and a lower side LS. The size of the plates P is selected according to the builder's specifications to obtain a desired visual appearance of the ceiling C; the plates P may, by way of example, be square with dimensions in the order of 1m x 1m.
  • The suspended ceiling may be mounted in a conventional manner below a fixed ceiling forming part of a building structure, to define a plenum or space S, and a fan drives air at a given temperature into this space S. The plates P are delivered in standard sizes, and the suspended ceiling is constructed as a sealed structure such that air A will primarily flow from the space S through air inlet diffuser devices 1 to be discussed in further details below.
  • Some of the plates P of the ceiling have an integral tubular part 5 of a respective air inlet diffuser device 1, the part 5 preferably being pressed out from the metal plates by a local deformation of a peripheral edge or rim of a through-going aperture previously made in the plate. The tubular part 5 extends into the space S. In an alternative embodiment the air inlet diffuser device 1 is formed as a component that includes the aforementioned part 5 which is inserted into the through-going aperture. The number and size of air inlet diffuser devices 1 is selected in accordance with the heat load, i.e. the amount of heat energy supplied as sunlight, by machinery, computers, people or lighting equipment to the building room or inside space (R) below the suspended ceiling.
  • Based on the total heat load an amount of cooling air to be supplied to the building room can be calculated using a PC-program. The arrangement, dimensions and number of the air inlet diffuser devices 1 may be calculated using this PC-program. In addition it is possible to integrate into the ceiling system any type of lighting fixture (not shown). The ceiling system may be used in any type of building where ventilation is required or desired.
  • The design or configuration of the air inlet diffuser device 1 is such that is may carry through large variations in the through-flow of air while still ensuring that the air exiting the device will "stick" to the lower side LS of the ceiling C; it will be understood that it is important to ensure that the air A flows as far as possible along and close to the lower side LS of the plates after exiting the device 1.
  • By the present invention it is made possible to obtain the aforementioned desirable flow without the need for any regulating devices, i.e. without the need for any movable parts for setting and varying the size of the flow passage of the air inlet diffuser device 1, in that the device provides for a minimum flow resistance and, hence, a minimum noise and energy requirement while at the same time complying with current building codes. The device factor kr may be in the order of 3.72, while traditional air inlet diffuser devices have a device factor kr of less than half.
  • The air inlet diffuser device 1 will in the following be discussed in further details, with reference to an embodiment where a part 5 thereof is a raised portion of the plates P, being pressed out from the plates P by a local deformation, such as by using a punching tool, of a peripheral edge or rim of a through-going aperture previously made in the plate.
  • The air inlet diffuser device 1 comprises as shown in fig. 2-4 a) an outer cylindrical tubular part 5 having an inside surface 5' and an upper free edge 8 to be located above the upper side US of the plates P and b) an inner elongated air guiding part 20 which is symmetrical about an axis of rotation 25, i.e. which may eg. have conical shape with the axis 25 parallel with the longitudinal axis of the tubular part 5. The tubular part 5 has at the lowermost extremity thereof a first circumferential flange 12 with a lower surface 12'. An even or uniform transition between the inner surface 5' of the tubular part 5 and the lower surface 12' is defined by a curved transition face 7. The air guiding part 20 is mounted centrally within the cylindrical tubular part 5 such that the distance d2 to the tubular part 5 measured perpendicular to the axis of rotation 25 decreases uniformly in the direction from the upper free edge 8. This forms a converging flow passage 3 between the tubular part 5 and the air guiding part 20. The air guiding part 20 extends farthest from the upper free edge 8 into a second circumferential flange 22 which together with the lower surface 12' forms a circumferential and horizontal air exit passage 2 for orienting air perpendicularly to the axis of rotation 25, i.e. parallel with or essentially parallel with the lower surface LS of the plate P. The air guiding part 20 is fixed to the tubular part 5 so as to be immovable during use of the device 1 in the building. Preferably, the apex T of the air guiding part 20 is located at a distance d4 below the edge 8 corresponding to 25%-75%, or 40% - 60%, of a distance d3 between the first circumferential flange 12 and the upper free edge 8.
  • As shown the circumferential passage 2 has no air flow restrictions and the tubular part 5 preferably has a circular cross-section of constant diameter. As also shown the air guiding part 20 is located in its entirety below the free edge 8, giving rise to a very compact construction, while at the same time the tubular part 5 projects by a distance d3 into the space S above the upper side US of the plates P, to provide for a "bathtub-effect" where cold air at the upper side US of the plates P is heated, thereby rising upwards, after which this heated air passes through the air inlet diffuser device 1, as shown by the arrows in fig. 1. Figs. 2-4 show different designs of a transition area 20" between the air guiding part 20 and the circumferential flange 22, and of the air guiding part 20 as such.
  • In use the system preferably drives - essentially without any installations in the space or plenum S - the desired heating or cooling air to the room R. The sub-cooled air having a temperature of eg. 13°C is - due to the temperature gradient - distributed across the upper side US of the plates P, and thereby brings about a cooling of the lower side LS of the plates P to a temperature of eg. 17°C, generating cooling radiation towards the room R. The air inlet diffuser devices 1 of the invention establish a through flow of the sub-cooled air, the air flowing horizontally along the lower side LS of the plates, contributing to a further cooling of the room R. The total cooling effect may eg. reach 100 W/m2 floor area, which cannot be obtained with the devices currently on the market. A high level of comfort in the room R is maintained.
  • The ceiling system may be used in all types of buildings with a need for ventilation.
  • It is noted that the shown solution where the part 5 is integral with the plates 5 is highly compact, allowing for the air to exit and flow very closely to the lower side LS of the plates 5; an alternative embodiment may be envisaged where the device 1 is designed with the aforementioned circumferential flange 12 configured to be secured to the plates P, the plates P in this embodiment being provided only with the aforementioned aperture with or without the raised portion discussed above.
  • By way of example the apertures formed in the plates 5 may have a diameter configured such that the diameter of the tubular part 5 is 160 mm when the raised portions are formed. The plates 5 may be 0.5 mm aluminium plates, and distance d3 and d4 may be 200 mm and 80 mm, respectively. A desired increased length d4 of the tubular part 5 may be obtained by placing a extension collar on top of the raised portion, the collar then defining the upper free edge of the tubular part 5.

Claims (11)

  1. An air inlet diffuser device (1) comprising a) an outer cylindrical tubular part (5) having an inside surface (5') and an upper free edge (8) and b) an inner elongated air guiding part (20) which is symmetrical about an axis of rotation (25), characterised in the tubular part (5) having at the lowermost extremity thereof a first circumferential flange (12) with a lower surface (12'), an even or uniform transition between the inner surface (5') of the tubular part (5) and said lower surface (12') being defined by a curved transition face (7), said air guiding part (20) being mounted centrally within said cylindrical tubular part (5) such that the distance (d2) to said tubular part (5) measured perpendicular to said axis of rotation (25) decreases uniformly in the direction from said upper free edge (8) for forming a converging flow passage (3) between said tubular part (5) and said air guiding part (20), and in that said air guiding part (20) farthest from said upper free edge (8) extends into a second circumferential flange (22) which together with said lower surface (12') forms a circumferential and preferably horizontal air exit passage (2) for orienting air perpendicularly to said axis of rotation (25).
  2. The air inlet diffuser device of claim 1, characterised in that the air exit passage (2) has no air flow restrictions.
  3. The air inlet diffuser device of claim 1 or 2, said tubular part (5) having a circular or square cross-section.
  4. The air inlet diffuser device according to any of the preceding claims, characterised in that the air guiding part (20) is located in its entirety below said upper free edge (8).
  5. The air inlet diffuser device according to the preceding claim, said air guiding part (20) being in use immovably fixed to said tubular part (5), the apex (T) of said air guiding part (20) being located at a distance (d4) below said free edge (8) corresponding to 25%-75% of a distance (d3) between said first circumferential flange (12) and said upper free edge (8).
  6. A system for advancing heating or cooling air to a building inside space (R), comprising a suspended ceiling (C) defined by a plurality of ceiling plates (P) having an upper side (US) and a lower side (LS), wherein air (A) is driven to a plenum (S) above the suspended ceiling (C) and from this plenum (S) is directed onto said lower side (LS) of said ceiling plates (P) by air inlet diffuser devices (1) comprising a) an outer cylindrical tubular part (5) having an inside surface (5') and an upper free edge (8) located in said plenum (S) and b) an inner elongated air guiding part (20) which is symmetrical about an axis of rotation (25), characterised in the tubular part (5) having at the lowermost extremity thereof a first circumferential flange (12) with a lower surface (12') facing said space (R), an even or uniform transition between the inner surface (5') of the tubular part (5) and said lower surface (12') being defined by a curved transition face (7), said air guiding part (20) being in use immovably fixedly mounted centrally within said cylindrical tubular part (5) such that the distance (d2) to said tubular part (5) measured perpendicular to said axis of rotation (25) decreases uniformly in the direction from said upper free edge (8) for forming a converging flow passage (3) between said tubular part (5) and said air guiding part (20), and in that said air guiding part (20) farthest from said upper free edge (8) extends into a second circumferential flange (22) which together with said lower surface (12') forms a circumferential and horizontal air exit passage (2) for orienting air perpendicularly to said axis of rotation (25).
  7. The system according to claim 6, characterised in that the air exit passage (2) has no air flow restrictions.
  8. The system according to claim 6 or 7, said ceiling plates (P) being metal ceiling plates (P), said tubular part (5) being pressed out of the ceiling plates (P) whereby said lower surface (12') is an integral part of said lower side (LS) of said ceiling plates (P).
  9. The system according to any of claims 6-8, said tubular part (5) having a circular or square cross-section.
  10. The system according to any of claims 6-9, said air guiding part (20) is located in its entirety below said upper free edge (8).
  11. The system according to any of claims 6-10, the apex (T) of said air guiding part (20) being located at a distance d4 below said free edge (8) corresponding to 25%-75% of a distance d3 between said first circumferential flange (12) and said upper free edge (8).
EP12160315.3A 2011-03-21 2012-03-20 An air inlet diffuser device, and a system including a building ceiling having one or more air inlet diffuser devices Active EP2503256B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201100193A DK177247B1 (en) 2011-03-21 2011-03-21 Installationless technical ceiling with integrated supply air luminaire for air conditioning of indoor climate in buildings
DK201100841A DK177703B1 (en) 2011-03-21 2011-10-31 An air supply luminaire, as well as a ceiling system with the air supply luminaire

Publications (3)

Publication Number Publication Date
EP2503256A2 true EP2503256A2 (en) 2012-09-26
EP2503256A3 EP2503256A3 (en) 2014-08-20
EP2503256B1 EP2503256B1 (en) 2020-08-12

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EP12160313.8A Active EP2503255B1 (en) 2011-03-21 2012-03-20 A system including a building ceiling having one or more integrated air inlet diffuser devices, and a metal ceiling plate for a suspended ceiling
EP12160315.3A Active EP2503256B1 (en) 2011-03-21 2012-03-20 An air inlet diffuser device, and a system including a building ceiling having one or more air inlet diffuser devices

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EP12160313.8A Active EP2503255B1 (en) 2011-03-21 2012-03-20 A system including a building ceiling having one or more integrated air inlet diffuser devices, and a metal ceiling plate for a suspended ceiling

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KR20220081614A (en) * 2020-12-09 2022-06-16 엘지전자 주식회사 Air-conditioner
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DK201100841A (en) 2012-09-22
EP2503255A2 (en) 2012-09-26
EP2503256B1 (en) 2020-08-12
DK177703B1 (en) 2014-03-24
EP2503255A3 (en) 2014-07-30
EP2503256A3 (en) 2014-08-20
EP2503255B1 (en) 2021-05-12

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