US3631788A - Supply air device for injection of perferably cold ventilation air - Google Patents

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

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Publication number
US3631788A
US3631788A US20745A US3631788DA US3631788A US 3631788 A US3631788 A US 3631788A US 20745 A US20745 A US 20745A US 3631788D A US3631788D A US 3631788DA US 3631788 A US3631788 A US 3631788A
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US
United States
Prior art keywords
air
ceiling surface
room
airflow
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
US20745A
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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
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Application filed by Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
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Publication of US3631788A publication Critical patent/US3631788A/en
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Expired - Lifetime legal-status Critical Current

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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

Definitions

  • airflow gaps are provided surrounding the distribution chamber to inject air streams substantially parallel to the ceiling surface radiating outwardly from the distribution chamber.
  • Airflow-regulating means are provided in each gap and in the distribution chamber to insure mixture of the air with secondary room air so as to avoid the draughts normally experienced from cold air inlet grilles.
  • SUPPLY AIR DEVICE FOR INJECTION OF PERFERABLY COLD VENTILATION AIR This invention relates to a supply air device for injecting preferably cold ventilation air into rooms which should be draught-free in the dwelling zone, It comprises a pressure box mortised in the ceiling of the room, which is connected to a drum system for supply of the ventilation air, said pressure box downwardly being defined by and communicating with the room through an air distribution means.
  • the supply air device is intended primarily for supplying rooms requiring permanent cooling with cold ventilation air.
  • Such rooms may be, for example, large office rooms which owing to heat emission from light fittings and human beings require cooling all the year round, or so-called internal zones which are surrounded on all sides by rooms heated in winter and which include such heat sources that said zones must be cooled even in the coldest days of the winter.
  • the cold ventilation air is heavy and, after its discharge from the supply air device mounted in the ceiling, it has, therefore, a strong tendency of rapidly sinking to the floor of the room where it causes an unpleasant draught before it is mixed with the room air.
  • the draught problem is particularly great in rooms with a low ceiling height.
  • An essential object of the present invention is, therefore, to produce a supply air device with a short throw (length). This applies particularly to air directed to the dwelling zone where the air speed must not exceed 0.15 m./sec., but also the air directed along the ceiling surface should have a short throw (length) in order not to cause draught.
  • the supply air device is intended for use in rooms with a subceiling construction where the pressure box is mounted in the space above the subceiling.
  • the supply air device must not project downwardly very much from the surface of the subceiling (for embodiments now in use a distance of 20 mm. has been deemed acceptable). Therefore, the pressure box has to be given a small height (at maximum 250 mm.). This implies great difficulties in eliminating the influence of the dynamic pressure of the supplied air before supplying the ventilation air.
  • the air is supplied to the pressure box through an air duct placed in the space above the subceiling and having a diameter of about 150 mm. Owing to the height dimension of the supply air device, and because for the same reason the supply duct usually is to be connected to one of the sidewalls of the pressure box, the dynamic pressure of the air supplied has a great tendency of being propagated through the air distribution means of the supply air device and giving rise to a concentrated jet of cold air in the room, which is inconvenient from a draught point of view.
  • Ventilation air injected into a room through a supply air device ejects with itself room air, thereby causing secondary airstreams in the room.
  • the coejected room air is not as clean as the injected ventilation air, but includes a great amount of dust particles which deposit on surfaces swept by the secondary airstreams. Particularly exposed to such deposits are the supply air device surfaces swept by secondary air and the ceiling surface around the supply air device.
  • the present invention has as its object to produce a supply air device of the aforementioned kind, which independent of the dynamic pressure in the presure box effects good distribution of the injected cold ventilation air in the room and a short throw length of said air, and which prevents the supply air device proper and the ceiling surface around the same from being fouled.
  • the invention is characterized in that the air distribution means comprises two perforated metal sheets mounted substantially horizontally somewhat spaced from each other and arranged so as together with sidewalls along their edges to enclose a distribution chamber for eliminating obliquely directed speed components in the airstream passing through said metal sheets and for uniformly distributing said airstream, and gaps around the perforated metal sheets outside said sidewalls, said gaps being provided with dampers for controlling the air amount flowing through the gap in question and adapted at opened dampers to inject air fogs substantially in parallel with the ceiling surface of the room.
  • the air fogs injected through the gaps around the perforated metal sheets eject with themselves the air (amount) flowing into the room through the perforated metal sheets and thereby prevent said air (amount) from directly flowing down into the dwelling zone and causing draft. Since, on the other hand, energy is consumed thereby for deflecting the air injected through the perforated metal sheets, the air fogs injected through the gaps will have a short throw length.
  • the air distribution in the room can be adjusted by means of the dampers in the gaps.
  • the air injected through the perforated metal sheets prevents the coejected room air from sweeping the supply air device and surrounding ceiling surface and from fouling the same.
  • An expedient embodiment of the invention is characterized in that the uppermost of the two perforated metal sheets has a substantially smaller degree of perforation, i.e. a smaller area of air passage, than the lowermost perforated metal sheet, preferably only one-fifth of the perforation degree of the lowermost metal sheet.
  • the uppennost of the two perforated metal sheets preferably may be provided with means for adjustably screening off the perforation openings whereby the perforation degree of said metal sheet can be varied.
  • Said screening for example, may be effected by a similar perforated metal sheet adapted to be moved adjacent the uppermost perforated metal sheet according to above, or by means of exchangeable unperforated metal sheets provided with a single-large opening, in such a manner, that the openings of the exchangeable metal sheets are of different size in relation to each other.
  • said gaps can be defined toward the ceiling surface by an edge plate projecting from the ceiling surface.
  • FIG. I shows a cross section of the supply air device mounted in a subceiling construction
  • FIG. 2 shows a section through the supply air device along the line II-II in FIG. I.
  • the supply air device is designated by l.
  • the supply air device comprises a pres sure box 4 mortised in the subceiling 3 of a room 2, which pressure box is connected to a drum system for the supply of ventilation air via an air duct 5.
  • the pressure box 4 is downwardly defined by and communicates with the room 2 through an air distribution means 6.
  • the air distribution means 6 comprises two perforated metal sheets 7 and 8 mounted horizontally somewhat spaced from each other and arranged so as together with sidewalls 9 along their edges to enclose a distribution chamber I0, further gaps 11 around said perforated metal sheets 7 and 8 outside said sidewalls, which gaps are provided with dampers I2 and adapted at opened dampers to inject air fogs 13 substantially in parallel with the ceiling surface 30 of the room.
  • the distribution chamber is intended, in addition to a uniform distribution of the airstream 14 passing through the perforated metal sheets 7 and 8 also to effect the elimination of obliquely directed speed components in said airstrearn, which components are caused by the dynamic pressure in the airstream supplied through the air duct 5.
  • the dampers 12 are intended for control of the air amount 13 flowing through the gap 1 l in question.
  • the cold airstream l4 downwardly injected through the perforated metal sheets 7 and 8 is ejected together with the air fogs 13 injected through the gaps l l.
  • said cold airstream is kept away from the dwelling zone and the entire injected air amount is caused to flow along the ceiling surface 3a to which the airstreams are attracted.
  • the air fogs 13 have a short throw (length).
  • Room air is also coejected (see the arrows 15), but due to the downwardly injected airstream 14 the room air is prevented from sweeping and fouling the supply air device 1 and the ceiling surface 3a around the same.
  • the uppermost perforated metal sheet 7 has a substantially smaller degree of perforation than the lowermost metal sheet 8, in order, prior to the injection into room 2, safely to eliminate the obliquely directed speed components caused in the air (amount) flowing through the perforated metal sheets 7 and 8 by the dynamic pressure in the pressure box 4.
  • a ratio of 1:5 between the perforation degrees of the uppermost and lowermost perforated metal sheets has proved to render the best results.
  • the air passage area of the uppermost perforated metal sheet 7 is adjustable. This can be achieved in different ways.
  • an exchangeable perforated metal sheet 16 adapted variably to screen off the perforation openings in the perforated metal sheet 7 is indicated by dashed lines.
  • the gaps ll are defined toward the ceiling surface 3a by an edge plate 17 projecting from the ceiling surface.
  • the injected ventilation air usually is filtered, but by said edge plate also the remaining dust particles and those from the coejected room air are prevented from appreciably fouling the ceiling surface, because they are caused by the edge plate to spread over a larger area before they meet the ceiling.
  • a device for supplying cold air into a room having a subceiling surface with an opening spaced inwardly from the side edges thereof for receiving the air supply device comprising a pressure box positioned 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 sidewalls 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 airflow from the air duct to thereby uniformly direct the airflow from said distribution box vertically downward into the room for mixture with the secondary room air, said sidewalls of said distribution chamber being spaced from the sides of said pressure box to provide airflow gaps s urroundrng said distribution
  • An air supply device including means cooperable with the perforated plate to variably screen ofi the airflow openings therethrough.
  • An air supply device according to claim 1 wherein said pressure box has edge plates depending below the ceiling surface and confronting the sidewalls of said distribution box in spaced relation to cooperate with said sidewalls to direct the air from said gap at a level spaced below the ceiling surface immediately surrounding said air supply device.
  • An air supply device including damper means in said airgaps to control the force of the air discharged through said gaps selectively around the periphery of said device.
  • a device wherein said opening is square and said airgaps comprise four gaps disposed along the respective sides of the square openings, said damper means including a separate flap valve in each gap.

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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)
  • Ventilation (AREA)
  • Air-Flow Control Members (AREA)
US20745A 1969-03-19 1970-03-18 Supply air device for injection of perferably cold ventilation air Expired - Lifetime US3631788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03849/69A SE334991B (fi) 1969-03-19 1969-03-19

Publications (1)

Publication Number Publication Date
US3631788A true US3631788A (en) 1972-01-04

Family

ID=20262994

Family Applications (1)

Application Number Title Priority Date Filing Date
US20745A Expired - Lifetime US3631788A (en) 1969-03-19 1970-03-18 Supply air device for injection of perferably cold ventilation air

Country Status (10)

Country Link
US (1) US3631788A (fi)
AT (1) AT300282B (fi)
CH (1) CH503237A (fi)
DE (1) DE2013244B2 (fi)
FI (1) FI53250C (fi)
FR (1) FR2039708A5 (fi)
GB (1) GB1241528A (fi)
NL (1) NL161873C (fi)
NO (1) NO123305B (fi)
SE (1) SE334991B (fi)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726204A (en) * 1971-06-23 1973-04-10 Svenska Flaektfabriken Ab Distributing device in plants for the maintenance of a dustfree, bacteriafree zone in a room
US4009647A (en) * 1974-04-26 1977-03-01 Howorth Air Engineering Limited Clean air zone for surgical purposes
US4094232A (en) * 1975-04-16 1978-06-13 Howorth Air Engineering Limited Clean air zone
US4137831A (en) * 1976-05-08 1979-02-06 Howorth Air Engineering Limited Clean air zone
US4252053A (en) * 1978-04-11 1981-02-24 Nissan Motor Company, Limited Air outlet device for a vehicle with an air conditioner
US4508022A (en) * 1981-11-28 1985-04-02 Gebrueder Trox Gmbh Ceiling air outlet
WO1986002711A1 (en) * 1984-11-01 1986-05-09 Total Air, Inc. Gaseous fluid distribution devices
GB2200982A (en) * 1986-12-02 1988-08-17 Roy Kelley Winfield Le Airflow distribution device
US4979433A (en) * 1988-09-21 1990-12-25 Schako Metallwarenfabrik Ferdinand Schad Kg Swirl outlet
EP1298396A3 (de) * 2001-09-28 2005-08-03 SCHAKO Klima Luft Ferdinand Schad KG Deckenauslass
US20150204574A1 (en) * 2014-01-21 2015-07-23 Halton Oy Air distribution device
US20190304819A1 (en) * 2018-04-03 2019-10-03 Bum Je WOO Efem, equipment front end module
NO344806B1 (no) * 2018-02-27 2020-05-04 Trox Auranor Norge As Kjølebaffel.

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2328875C2 (de) * 1973-06-06 1989-11-02 CIBA-GEIGY AG, 4002 Basel Luftverteiler
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.
SE8700327D0 (sv) * 1987-01-28 1987-01-28 Bahco Ventilation Ab Tilluftsdon
DE3805873A1 (de) * 1988-02-25 1989-09-07 Zander Waermetechnik Kulmbach Luftauslasssystem in elementbauweise
GB8828127D0 (en) * 1988-12-02 1989-01-05 Howorth F H Apparatus for providing clean air zone
WO1991011662A1 (en) * 1990-01-23 1991-08-08 Jeven Oy Method for arranging inlet air flow and inlet air device
DE9310711U1 (de) * 1993-07-17 1993-09-02 Ltg Lufttechnische Gmbh Luftauslaß
GB9400481D0 (en) * 1994-01-12 1994-03-09 Griffiths Richard A A draught resistant ventilation the means to ventilate a space whilst resisting draught
DE19822806C2 (de) * 1998-04-30 2001-04-26 Johann Schoenhammer Stallbelüftungsanlage
DE10064939C2 (de) * 2000-12-23 2003-06-26 Ltg Ag Lufttechnische Einrichtung für einen Raum
DE50207304D1 (de) 2002-08-13 2006-08-03 Johann Schoenhammer Raumbelüftungsinstallation, insbesondere zur Stallbelüftung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB477512A (en) * 1937-06-16 1937-12-31 Robert Speidel Improvements in or relating to means for the uniform distribution in a room of a current of air or gas supplied by a pipe
US2821898A (en) * 1955-08-16 1958-02-04 Barber Colman Co Air distribution outlet
US3392657A (en) * 1966-02-03 1968-07-16 Svenska Flaektfabriken Ab Air inlet device
US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB477512A (en) * 1937-06-16 1937-12-31 Robert Speidel Improvements in or relating to means for the uniform distribution in a room of a current of air or gas supplied by a pipe
US2821898A (en) * 1955-08-16 1958-02-04 Barber Colman Co Air distribution outlet
US3392657A (en) * 1966-02-03 1968-07-16 Svenska Flaektfabriken Ab Air inlet device
US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726204A (en) * 1971-06-23 1973-04-10 Svenska Flaektfabriken Ab Distributing device in plants for the maintenance of a dustfree, bacteriafree zone in a room
US4009647A (en) * 1974-04-26 1977-03-01 Howorth Air Engineering Limited Clean air zone for surgical purposes
US4094232A (en) * 1975-04-16 1978-06-13 Howorth Air Engineering Limited Clean air zone
US4137831A (en) * 1976-05-08 1979-02-06 Howorth Air Engineering Limited Clean air zone
US4252053A (en) * 1978-04-11 1981-02-24 Nissan Motor Company, Limited Air outlet device for a vehicle with an air conditioner
US4508022A (en) * 1981-11-28 1985-04-02 Gebrueder Trox Gmbh Ceiling air outlet
WO1986002711A1 (en) * 1984-11-01 1986-05-09 Total Air, Inc. Gaseous fluid distribution devices
US4616558A (en) * 1984-11-01 1986-10-14 Total Air, Inc. Gaseous fluid distribution devices
GB2200982A (en) * 1986-12-02 1988-08-17 Roy Kelley Winfield Le Airflow distribution device
GB2200982B (en) * 1986-12-02 1990-11-14 Kelley Winfield Le Roy Airflow distribution device
US4979433A (en) * 1988-09-21 1990-12-25 Schako Metallwarenfabrik Ferdinand Schad Kg Swirl outlet
EP1298396A3 (de) * 2001-09-28 2005-08-03 SCHAKO Klima Luft Ferdinand Schad KG Deckenauslass
US20150204574A1 (en) * 2014-01-21 2015-07-23 Halton Oy Air distribution device
US10677491B2 (en) * 2014-01-21 2020-06-09 Halton Oy Air distribution device
NO344806B1 (no) * 2018-02-27 2020-05-04 Trox Auranor Norge As Kjølebaffel.
US20190304819A1 (en) * 2018-04-03 2019-10-03 Bum Je WOO Efem, equipment front end module
US10784131B2 (en) * 2018-04-03 2020-09-22 Bum Je WOO EFEM, equipment front end module

Also Published As

Publication number Publication date
NL161873B (nl) 1979-10-15
NO123305B (fi) 1971-10-25
DE2013244B2 (de) 1978-08-31
FR2039708A5 (fi) 1971-01-15
DE2013244A1 (de) 1970-10-01
FI53250C (fi) 1978-03-10
GB1241528A (en) 1971-08-04
FI53250B (fi) 1977-11-30
NL161873C (nl) 1980-03-17
SE334991B (fi) 1971-05-10
CH503237A (de) 1971-02-15
NL7003853A (fi) 1970-09-22
AT300282B (de) 1972-07-25

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