US3699871A - Supply air device for injection of preferably cold ventilation air - Google Patents

Supply air device for injection of preferably cold ventilation air Download PDF

Info

Publication number
US3699871A
US3699871A US119091A US3699871DA US3699871A US 3699871 A US3699871 A US 3699871A US 119091 A US119091 A US 119091A US 3699871D A US3699871D A US 3699871DA US 3699871 A US3699871 A US 3699871A
Authority
US
United States
Prior art keywords
air
room
ceiling surface
distribution chamber
pressure box
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.)
Expired - Lifetime
Application number
US119091A
Other languages
English (en)
Inventor
Birger Larkfeldt
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.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken AB
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 Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
Application granted granted Critical
Publication of US3699871A publication Critical patent/US3699871A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • SUPPLY AIR DEVICE FOR INJECTION OF PREFERABLY COLD VENTILATION AIR This invention relates to a special embodiment of the supply air device described in my US. Pat. No. 3,631,788 for injecting preferablycold ventilation airinto rooms required to be draught-free in the dwelling zone.
  • Said devices comprises a pressure box mortized in the ceiling and connected to a duct system for the supply of ventilation air.
  • the pressure box is downwardly defined by and communicates with the room through an air distribution means comprising two perforated metal sheets mounted substantially horizontally somewhat spaced from each other and so arranged, that the sheets together'with side walls along their edges enclose a distribution chamber for the elimination of obliquely directed speed components and thereby to effect a uniform distribution of the air stream passing through said sheets.
  • the air distribution means further includes gaps disposed around the perforated sheets outside said side walls, which gaps are provided with dampers for controlling the air amount flowing through the gap in question and adapted at opened dampers to inject air veils substantially in parallel with the ceiling surface of the room.
  • Supply air devices according to the invention and aforementioned patent specification are primarily intended for injecting cold ventilation air into rooms having a permanent cooling demand.
  • Such rooms may be, for example, large-space office rooms requiring cooling all the year because of the heat emission from lighting fittings and persons, or such rooms which are surrounded on all sides by rooms heated in the wintertime and including such heat sources that the rooms require cooling even on the coldest days of the winter.
  • the supply air device preferably is intended to be placed in the ceiling in the inner parts of the room where the air is desired to be distributed substantially uniformly to all directions.
  • the present invention relates to a variant of said supply air device for use at the outer parts of the room, preferably adjacent the outer walls.
  • the supply air device which is intended for use in rooms with a sub-ceiling, further shall be adapted to be mortized in ceilings provided with rectangular, possibly soundproof slabs having the size of, for example, 300 X 600 mm, i.e., corresponding to half a ceiling slab. It is desired to be able so to direct the air injected into the room that a favorable air distribution is obtained, and simultaneously to avoid blowing of air against the wall.
  • the present invention which has as its object to meet these special requirements, is characterized in that one of said gaps is provided with a plurality of damper blades arranged to the side of each other and adapted individually to be turned into different directions about a vertical axle, that the side 'of the supply air device opposed to said gap is closed, and that each of the gaps disposed along the remaining sides of the device is provided with a damper blade adapted to be turned about a horizontal axle.
  • damper blades One usual setting of the damper blades is to direct them at the same angle to the center line. Another usual setting is to direct the damper blades in one half of the device at one angle and the remaining blades at another angle to the center line. By these adjusting possibilities the air jet can be directed at the desired angle to the center line, and it also can be directed in a diverging or converging'way.
  • An expedient embodiment of the invention is characterized in that the uppermost of the two perforated metal sheets has a considerably smaller perforationdegree, i.e., it is given an area permeable to air which is smaller than that of the lower sheet, preferably only one fifth of the perforation degree of the latter. This improves additionally the capability of the air distribution means to eliminate the detrimental effect of the dynamic pressure in the pressure box on the air distribution in the air.
  • the uppermost of the two perforated sheets preferably is provided with means for variably screening off the perforation apertures and thereby to vary the perforation degree of said sheet.
  • the screening can be effected, for example, by means of a similar perforated sheet mounted movably adjacent the uppermost perforated sheet according to above, or by means of exchangeable unperforated sheets provided with one large opening of a size different for each of said exchangeable plates.
  • the gaps can be defined toward the ceiling surface by an edge plate projecting from the ceiling surface.
  • FIG. 1 shows a cross-section of the supply air device inserted in a sub-ceiling structure
  • FIG. 2 shows a section through the supply air device along the line 11-11 in FIG. 1, and
  • FIG. 3 shows a section through the supply air device along the line IIIIII in FIG. 1.
  • the supply air device is designated by 1.
  • the device comprises a pressure box 4 mortized in the sub-ceiling 3 of a room 2 and connected to a duct system for the supply of the ventilation air via an air passageway 5.
  • the pressure box is defined downwardly by and communicates with the room 2 through an air distribution means 6.
  • said distribution means 6 comprises two perforated metal sheets 7 and 8, which are mounted horizontally somewhat spaced from each other and arranged so as together with side walls 9 along their edges to enclose a distribution chamber 10.
  • the gap 21 preferably is turned inwardly to the room and provided with a plurality of damper blades 18 arranged to the side of each other and adapted individually to be turned to different directions about a vertical axle for controlling the flow direction and throw length of the air jet 20.
  • the side of the device which is opposite to said gap 21 is closed by a metal sheet 19. As this side preferably is intended to be placed very closely to an outer wall, no air will be blown against this wall.
  • Each of the gaps 1 1 along the two remaining sides is provided with a damper blade 12 adapted to be turned about a horizontal axle and at opened dampers to inject air veils 13 substantially along the ceiling surface 3a of the room.
  • the distribution chamber is intended to effect a uniform distribution of the air stream 14 passing through the perforated sheets 7 and 8, and further to eliminate in said air stream obliquely directed speed components originating from the dynamic pressure in the air stream supplied through the air passageway 5.
  • the dampers 12 are intended to control the air amount 13 flowing through the gap 11 in question, and the object of the damper blades 18 is to control the direction of the air jet 20 passing through the gap 21. It is hereby possible to adjust in a simple way the flow pattern in the room 2 and so to direct the ventilation air, that it does not give rise to draught in the room.
  • the cold air stream 14 injected downwardly through the perforated sheets 7 and 8 is ejected together with the air veils 13 injected through the gaps 11 and by the air jet injected through the gap 21.
  • the cold air stream thus, is kept away from the dwelling zone, and the entire air amount injected is caused to flow along the ceiling surface 3a to which the air streams are attracted.
  • the air veils 13 are given a short throw length.
  • Room air is also co-ejected (see arrows 15), but owing to the downwardly injected air stream 14 the room air is prevented from sweeping and dirtying the device 1 and the ceiling surface 3a around the same.
  • the uppermost perforated sheet 7 has a degree of perforation considerably smaller than that of the lowermost perforation sheet 8, in order to ensure that the obliquely directed speed components caused in the air flowing through the perforated sheets 7 and 8 by the dynamic pressure in the pressure box 4 are eliminated prior to the injection into the room 2.
  • a ratio 1:5 between the perforation degrees of the uppermost sheet and lowermost sheet has proved to render the best results.
  • the airpermeable area of the uppermost perforated sheet 7 may be suitable. This can be effected in different ways.
  • the dashed lines indicated an exchangeable metal sheet 16 provided with holes for variably screening off the perforation apertures in the perforated sheet 7.
  • the gaps 11 are defined toward the ceiling surface 3a by a folded edge plate 17 projecting from the ceiling surface.
  • the ventilation air injected usually is filtered, but also the remaining dust particles and the dust particles from the co-ejected room air are prevented from appreciably dirtying the ceiling surface, because they are spread by the edge plate over a greater area before they meet the ceiling.
  • said device comprising a pressure box positione'd above the plane of the ceiling surface and having a cold air duct connected thereto through one side thereof so as to introduce air into said pressure box from a direction parallel to the ceiling surface, said pressure box being mounted in said opening in said ceiling and having a lower portion comprising an air distribution means for introducing cold air from said pressure box into the room, said air distribution means comprising a pair of vertically spaced perforated plates disposed parallel to the plane of the ceiling surface, and side walls surrounding said pair of plates and disposed intermediate said plates to define a distribution chamber below said pressure box which eliminates any lateral component of air flow from the air duct to thereby uniformly direct the air flow from said distribution chamber vertically downward into the room for mixture with the secondary room air, one of said side walls of said distribution chamber .confronting said room wall being connected to the corresponding side of the pressure.
  • the opposite chamber side wall furthest from said room wall being spaced from the corresponding side of said pressure box to provide an air flow gap alongside said distribution chamber, individually'adjustable upright vanes providing guiding surfaces in said gap for directing air flow from said pressure chamber outwardly from said air supply device substantially parallel to the ceiling surface of the room to provide an air veil to prevent flow of secondary room air along the ceiling surface alongside said device, and to deflect by ejection the downwardly. directed flow from said distribution chamber.
  • An air supply device including means cooperable with the perforated plate to variably screen off the air flow openings therethrough.
  • An air supply device according to claim 1 wherein said pressure box between said opposite side walls of the distribution chamber has 'edge plates depending below the ceiling surface and confronting the corresponding side walls of said distribution box in spaced relation to cooperate with said side walls to provide side gaps to direct the air sideways from said pressure box at a level spaced below the ceiling surface immediately adjoining said air supply device.
  • An air supply device including horizontal damper means in said side air gaps to control the force of the air discharged through said gaps selectively.
  • a device wherein said opening is rectangular and said air gaps comprise three gaps disposed along the respective sides of the rectangular openings, said horizontal damper means including a separate flap valve in each side gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)
  • Air-Flow Control Members (AREA)
US119091A 1970-02-26 1971-02-26 Supply air device for injection of preferably cold ventilation air Expired - Lifetime US3699871A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE02478/70A SE351287B (fi) 1970-02-26 1970-02-26

Publications (1)

Publication Number Publication Date
US3699871A true US3699871A (en) 1972-10-24

Family

ID=20260032

Family Applications (1)

Application Number Title Priority Date Filing Date
US119091A Expired - Lifetime US3699871A (en) 1970-02-26 1971-02-26 Supply air device for injection of preferably cold ventilation air

Country Status (8)

Country Link
US (1) US3699871A (fi)
JP (1) JPS545224B1 (fi)
CA (1) CA937805A (fi)
DE (1) DE2106394A1 (fi)
FR (1) FR2083111A6 (fi)
GB (1) GB1317864A (fi)
NL (1) NL7102599A (fi)
SE (1) SE351287B (fi)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834453A (en) * 1972-11-07 1974-09-10 Tiem Inc Ab Air conditioning unit
US3874754A (en) * 1972-11-27 1975-04-01 Kewaunee Scient Equipment Corp Biohazard safety cabinet
US3881402A (en) * 1972-05-08 1975-05-06 Svenska Flaektfabriken Ab Distributing ventilating medium within spaces
US3906846A (en) * 1973-06-20 1975-09-23 Charles C Day Dirt control shield for an air outlet
US4726563A (en) * 1980-11-28 1988-02-23 Carrier Corporation Low frequency noise and turbulence reducer
US6554880B1 (en) 2000-11-22 2003-04-29 David T. Northcutt Adjustable air diffuser and related methods
DE102009009109B3 (de) * 2009-02-16 2010-10-07 Howatherm-Klimatechnik Gmbh Verfahren zur Belüftung eines Raumes
US20100319875A1 (en) * 2009-06-19 2010-12-23 Julian Rimmer Displacement diffuser with heat/cool changeover
WO2011091886A1 (de) * 2010-01-28 2011-08-04 Yit Germany Gmbh Luftdurchlass mit einem gehäuse sowie ein deckensegel mit luftdurchlass
US10852015B2 (en) 2015-05-12 2020-12-01 Halton Oy Controlled dilution flow in critical environments
EP3772624A1 (en) * 2019-08-05 2021-02-10 Madel Air Technical Diffusion, S.A. Dual plenum for air distribution
US11555619B2 (en) * 2017-02-14 2023-01-17 Shinwa Controls Co., Ltd. Air conditioner

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2833822C2 (de) * 1978-08-02 1982-01-21 Werner Ing.(Grad.) 8781 Eussenheim Reith Decken-Luftauslaßvorrichtung für variablen Volumenstrom zur Raumbelüftung
GB2120778A (en) * 1982-05-20 1983-12-07 Howorth Air Eng Ltd Outlet device for an air conditioning system
FI78548C (fi) * 1986-12-30 1989-08-10 Halton Oy Luftfoerdelningssystem.
US5255470A (en) * 1992-06-23 1993-10-26 Gencorp Inc. Vehicle door glass regulator
CZ307117B6 (cs) * 2008-05-13 2018-01-24 České vysoké učení technické v Praze, Fakulta strojní, Ústav techniky prostředí Zařízení pro rovnoměrný velkoplošný a jednosměrný přívod vzduchu do prostoru

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544689A (en) * 1946-04-12 1951-03-13 Barber Colman Co Air distribution unit
US3380372A (en) * 1966-08-01 1968-04-30 Hupp Corp Air guide structure
US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544689A (en) * 1946-04-12 1951-03-13 Barber Colman Co Air distribution unit
US3380372A (en) * 1966-08-01 1968-04-30 Hupp Corp Air guide structure
US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881402A (en) * 1972-05-08 1975-05-06 Svenska Flaektfabriken Ab Distributing ventilating medium within spaces
US3834453A (en) * 1972-11-07 1974-09-10 Tiem Inc Ab Air conditioning unit
US3874754A (en) * 1972-11-27 1975-04-01 Kewaunee Scient Equipment Corp Biohazard safety cabinet
US3906846A (en) * 1973-06-20 1975-09-23 Charles C Day Dirt control shield for an air outlet
US4726563A (en) * 1980-11-28 1988-02-23 Carrier Corporation Low frequency noise and turbulence reducer
US6554880B1 (en) 2000-11-22 2003-04-29 David T. Northcutt Adjustable air diffuser and related methods
DE102009009109B3 (de) * 2009-02-16 2010-10-07 Howatherm-Klimatechnik Gmbh Verfahren zur Belüftung eines Raumes
US20100319875A1 (en) * 2009-06-19 2010-12-23 Julian Rimmer Displacement diffuser with heat/cool changeover
WO2011091886A1 (de) * 2010-01-28 2011-08-04 Yit Germany Gmbh Luftdurchlass mit einem gehäuse sowie ein deckensegel mit luftdurchlass
US10852015B2 (en) 2015-05-12 2020-12-01 Halton Oy Controlled dilution flow in critical environments
US11555619B2 (en) * 2017-02-14 2023-01-17 Shinwa Controls Co., Ltd. Air conditioner
EP3772624A1 (en) * 2019-08-05 2021-02-10 Madel Air Technical Diffusion, S.A. Dual plenum for air distribution

Also Published As

Publication number Publication date
FR2083111A6 (fi) 1971-12-10
CA937805A (en) 1973-12-04
SE351287B (fi) 1972-11-20
GB1317864A (en) 1973-05-23
DE2106394A1 (de) 1971-09-09
NL7102599A (fi) 1971-08-30
JPS545224B1 (fi) 1979-03-14

Similar Documents

Publication Publication Date Title
US3631788A (en) Supply air device for injection of perferably cold ventilation air
US3699871A (en) Supply air device for injection of preferably cold ventilation air
US2182690A (en) Air conditioning apparatus
AU2010330689B2 (en) A system and method for delivering air
DK9400295U3 (da) Luftindblæsningsrør
US20060211365A1 (en) Induction diffuser
US5346426A (en) Method and an apparatus in ventilation
US4142456A (en) Air diffuser
US3881402A (en) Distributing ventilating medium within spaces
DE69915867D1 (de) Klimaanlage
US3967780A (en) Air conditioning system
US2131725A (en) Method and system for treating air or other fluids
US4679495A (en) Air diffuser
US4475446A (en) High volume ceiling type air diffuser
DE19525945C2 (de) Verfahren und Vorrichtung zur Erzeugung behaglicher Raumluftzustände
US4606259A (en) Air curtain
DE2033195A1 (de) Einrichtung zum Klimatisieren von Räumen von Gebäuden oder dergleichen
WO1991019135A1 (en) Air conditioning system and method
US3885462A (en) Device to condition rooms
US5554071A (en) Air-change system for a multi-storey building
US1641899A (en) System of ventilating and humidifying
GB2144212A (en) Apparatus for conditioning room air
JPS6042391B2 (ja) 階段状観客席を備える建物の空調装置
KR20040096993A (ko) 실내공조용 취출구의 송풍베인
JP2955519B2 (ja) 空調方法