EP0821206A2 - Installation de climatisation - Google Patents

Installation de climatisation Download PDF

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Publication number
EP0821206A2
EP0821206A2 EP97304936A EP97304936A EP0821206A2 EP 0821206 A2 EP0821206 A2 EP 0821206A2 EP 97304936 A EP97304936 A EP 97304936A EP 97304936 A EP97304936 A EP 97304936A EP 0821206 A2 EP0821206 A2 EP 0821206A2
Authority
EP
European Patent Office
Prior art keywords
air conditioner
base
casing
air
cassette
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.)
Withdrawn
Application number
EP97304936A
Other languages
German (de)
English (en)
Other versions
EP0821206A3 (fr
Inventor
Nigel John Fawcett
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.)
TEV Ltd
Original Assignee
IMI Air Conditioning Ltd
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 IMI Air Conditioning Ltd filed Critical IMI Air Conditioning Ltd
Publication of EP0821206A2 publication Critical patent/EP0821206A2/fr
Publication of EP0821206A3 publication Critical patent/EP0821206A3/fr
Withdrawn legal-status Critical Current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
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • 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
    • F24F13/20—Casings or covers

Definitions

  • This invention relates to air conditioners and more particularly to ceiling-mounted, or so-called "cassette", air conditioners.
  • Cassette air conditioners comprise a casing that houses a heat exchanger, usually in the form of coiled metal, eg copper, tube, and a fan.
  • the heat exchanger is typically the evaporator of a refrigeration unit, the condenser of which is usually remotely located, typically on an outside wall.
  • the heat exchanger could be connected to a remotely located refrigeration unit that serves to supply chilled water to the heat exchanger.
  • the fan sucks in air from the room which passes over the heat exchanger and the cooled air is discharged back into the room. During that process, condensation forms on the external surface of the heat exchanger and drips into a drip tray from which it drains or is periodically pumped away.
  • such air conditioners also include a heating function whereby, especially in the winter, the air may be heated instead of being cooled.
  • the aforesaid casing consists of a multiplicity of separately formed parts secured together by screws and/or nuts and bolts. More particularly, it will typically comprise a rigid rectangular top made of sheet metal from which the fan and the heat exchanger are suspended, and four separately formed rectangular side walls, again made of sheet metal.
  • the base of the casing is defined largely by the drip tray which is usually moulded in a plastics material. Underlying the drip tray is a rectangular grille which is designed to be visually attractive.
  • the grille which nowadays usually comprises a plastics moulding, has a central air inlet section and peripheral air outlets.
  • Each outlet has a separately moulded, elongate baffle associated with it which is mounted on the grille and can be rotated about a longitudinal axis, either manually or by means of a remotely controlled electric motor, so as to vary as desired the direction of flow of the conditioned air into the room.
  • the aforementioned sheet metal components of the casing need to be internally or externally thermally insulated in order to prevent the formation of condensation on their external surfaces. This is usually achieved by sticking sheets of insulating material to the internal or external surfaces of the sheet metal components.
  • a cassette air conditioner including a casing housing a fan and a heat exchanger, the casing having a top, side walls and a base defining a drip tray for collecting condensation formed, in use, on the external surface of the heat exchanger, characterised in that the side walls and the base are formed as a one-piece moulding in an expanded, thermally insulating plastics material.
  • the casing will usually be generally cuboid in shape with the top, base and side walls being substantially rectangular.
  • the invention affords the ready possibility of adopting other shapes, for example generally cylindrical ones.
  • the plastics material is an expanded, relatively rigid polystyrene, but any other suitable expanded plastics material may be used.
  • Such materials are easy to mould in relatively complex shapes using relatively low-cost tooling by, for example, steam-treating granular raw plastics material in situ in the mould.
  • the invention affords a cassette air conditioner having a casing which dispenses with many of the separate sheet metal components hitherto conventionally used, which is relatively lightweight and to which thermally insulating material does not need to be separately applied.
  • the invention significantly simplifies the assembly operation and, therefore, considerably reduces assembly costs.
  • the cassette air conditioner comprises a casing designated generally 1 which houses an electrically powered centrifugal fan 2 and an annular heat exchanger coil 3 comprising coiled copper tube.
  • the fan 2 and coil 3 are both securely suspended from a rigid, rectangular top 4 of the casing 1.
  • the top 4 may be made principally of thin sheet metal, such as steel, strengthened to render it rigid.
  • the rest of the casing 1 is moulded in one-piece, using known techniques, in a relatively high density, expanded polystyrene such as 80g/ltr CARIL (Trade Mark).
  • This one-piece moulding comprises four rectangular side walls 5, 6, 7 and 8 and a rectangular base 9.
  • the one-piece moulding is secured to the top 4 by appropriate fasteners (not shown).
  • the base 9 has a central opening 10 in which is secured a cowl 11.
  • the cowl 11 may be made of metal or a plastics material and serves the function described later.
  • the channel 12 is located vertically below the heat exchange coil 3 such that condensation which forms on the external surfaces of the latter during operation of the air conditioner will continually drip into the channel 12.
  • condensation collected in the channel 12 flows into a sump 13 located below the level of the channel 12 from where the condensation drains under the action of gravity or is periodically pumped away, in either case to an external location.
  • the sides of the rectangular base 9 are, adjacent to the side walls 5, 6, 7 and 8, formed with respective elongate openings, 14, 15, 16 and 17 through which the cooled air is discharged into the room, as will be described in more detail later.
  • the casing will be located by suitable fixings (not shown) in the cavity above a false ceiling 18 and, surface-mounted on the ceiling 18, is a rectangular grille 19 secured by appropriate fasteners (not shown) to the base 9 of the casing 1.
  • the grille 19 is in the form of a visually attractive plastics moulding and comprises one or more central openings 20 and four peripheral elongate openings, two of which 21 and 22 can be seen in Figure 1.
  • each opening 21, 22 etc has a curved, elongate baffle associated with it, two of which, 23, 24 can be seen in Figure 1.
  • Each baffle 23, 24 etc is pivotally mounted so that it can be moved manually or, by means of an electric motor, remotely in order to vary the discharge direction of the cooled air into the room.
  • the baffles 23, 24 etc are pivotally mounted on the grille 19 itself which increases the complexity, and tooling costs, of the grille moulding.
  • Such an arrangement may be used in an air conditioner of the present invention, but the invention affords the possibility of readily providing mountings for the baffles 23, 24 etc in the base 9 of the casing 1 instead, whereby the grille 19 moulding may be considerably simplified.
  • mounting inserts for the baffles 23, 24 etc could easily be securely incorporated into the base 9 during the expanded plastics moulding process.
  • appropriate inserts could be incorporated into the expanded plastics moulding at any desired location to receive requisite fasteners, such as screws.
  • the base 9 could have appropriate inserts incorporated into it for receiving fasteners that fasten the grille 19 to the base 9 of the casing 1.
  • Air is drawn in axially by the fan 2 from the room through the central opening(s) 20 in the grille 19 and the cowl 11.
  • the air is discharged radially by the fan 2 through openings in its side wall and then passes over the heat exchange coil 3.
  • cold refrigerant or chilled water is circulated through the coil 3 and thus, by virtue of heat exchange therewith, the air becomes cooled.
  • the external surface of the coil 3 may have fins attached to it in order to improve the heat exchange efficiency.
  • the cooled air is then constrained by the top 4 and the side walls 5, 6, 7 and 8 of the casing 1 and by the external surface of the cowl 11 to flow in a downwards direction towards the elongate openings 14, 15, 16 and 17 in the base 9 of the casing 1.
  • the cooled air is then discharged into the room via the baffled openings 21, 22 etc in the grille 19.
  • the above-described air flow path is indicated by arrows in Figure 1.
  • the air conditioner may, if desired, be used to heat the air rather than to cool it. As is conventional, this may be achieved, where the coil 3 is cooled directly by refrigerant, by reversing the cycle of the refrigeration unit whereby the coil 3 acts as the condenser instead of the evaporator, or, where the coil 3 is chilled by water, by circulating hot water through it.
  • electric heating elements may be provided adjacent to the coil 3. The desired degree of cooling or heating, as the case may be, will be controlled by a room thermostat and associated control circuitry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
EP97304936A 1996-07-25 1997-07-07 Installation de climatisation Withdrawn EP0821206A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9615683.1A GB9615683D0 (en) 1996-07-25 1996-07-25 Improvements relating to air conditioners
GB9615683 1996-07-25

Publications (2)

Publication Number Publication Date
EP0821206A2 true EP0821206A2 (fr) 1998-01-28
EP0821206A3 EP0821206A3 (fr) 1999-02-17

Family

ID=10797524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97304936A Withdrawn EP0821206A3 (fr) 1996-07-25 1997-07-07 Installation de climatisation

Country Status (2)

Country Link
EP (1) EP0821206A3 (fr)
GB (2) GB9615683D0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1139034A1 (fr) * 1999-01-25 2001-10-04 Mitsubishi Denki Kabushiki Kaisha Conditionneur d'air incorporé dans le plafond
EP1035384A4 (fr) * 1998-09-30 2001-12-19 Daikin Ind Ltd Organe de conditionnement d'air
DE202008003864U1 (de) * 2008-03-19 2009-08-13 Tinnefeld, Hans Klimatisierungssystem für Räume
NO339922B1 (no) * 2010-02-23 2017-02-13 Chiller Oy Kassettluftkondisjoneringsapparat

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083198A (en) * 1976-03-29 1978-04-11 Dennis Donald I Air conditioner case with condensation shield
AU501924B2 (en) * 1976-04-30 1979-07-05 Tokyo Shibaura Electric Company Ltd. Airconditioning apparatus
FR2578961A1 (fr) * 1984-06-12 1986-09-19 Parant Guy Ventilo-convecteur modulaire
GB2240621B (en) * 1990-01-31 1993-10-20 Toshiba Kk Ventilating fan
IT9019272A1 (it) * 1990-02-06 1991-08-07 Delchi Carrier Spa Unita' di condizionamento ribaltabile
US5294195A (en) * 1992-11-02 1994-03-15 Carrier Corporation Cover for the outside enclosure of an air conditioning system
JPH06281185A (ja) * 1993-03-30 1994-10-07 Toshiba Ave Corp 空気調和機の天井パネル

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1035384A4 (fr) * 1998-09-30 2001-12-19 Daikin Ind Ltd Organe de conditionnement d'air
EP1139034A1 (fr) * 1999-01-25 2001-10-04 Mitsubishi Denki Kabushiki Kaisha Conditionneur d'air incorporé dans le plafond
US6450880B1 (en) 1999-01-25 2002-09-17 Mitsubishi Denki Kabushiki Kaisha Ceiling embedded-type air conditioner
DE202008003864U1 (de) * 2008-03-19 2009-08-13 Tinnefeld, Hans Klimatisierungssystem für Räume
EP2103881A3 (fr) * 2008-03-19 2011-04-06 Hans Tinnefeld Système de climatisation pour pièces
NO339922B1 (no) * 2010-02-23 2017-02-13 Chiller Oy Kassettluftkondisjoneringsapparat

Also Published As

Publication number Publication date
GB9615683D0 (en) 1996-09-04
GB2315542A (en) 1998-02-04
GB2315542B (en) 2000-03-22
EP0821206A3 (fr) 1999-02-17
GB9714148D0 (en) 1997-09-10

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