US2932956A - Air-conditioning apparatus of the induction type - Google Patents

Air-conditioning apparatus of the induction type Download PDF

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Publication number
US2932956A
US2932956A US746030A US74603058A US2932956A US 2932956 A US2932956 A US 2932956A US 746030 A US746030 A US 746030A US 74603058 A US74603058 A US 74603058A US 2932956 A US2932956 A US 2932956A
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United States
Prior art keywords
air
heat exchanger
chamber
silencing
nozzles
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
US746030A
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English (en)
Inventor
Chieregatti Luigi
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Individual
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Individual
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Publication of US2932956A publication Critical patent/US2932956A/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
    • 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
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices

Definitions

  • Air-conditioners of the induction type comprise a primary air supply chamber to which air flows at high speed and high static pressure from a fan, if desired in a preconditioned state, air fiowing from the supply chamber through a valved opening to silencing and expansion chamber provided on a wall thereof with injection nozzles.
  • the primary air enters through the nozzles at high speed a mixing chamber and induces from the surroundings through a heat exchanger extending along said mixing chamber a secondary air stream with which it forms a mixture which is supplied through a port to the room to be conditioned.
  • the main object of this invention is to provide an airconditioner of the type referred to above, improved to combine a satisfactory operation and inexpensive installation, low cost of manufacture and moderate height, whereby it is suitable for installation below the windows of modern buildings with low sills.
  • An object of this invention is to provide a special arrangement of the supply chamber, silencing and expansion chamber and mixing chamber.
  • the above mentioned drawback is removed by arranging the supply chamber and silencing and expansion chamber side by side in horizontal direction in a lower portion of the apparatus, thereby forming a box of approximately rectangular cross-sectional shape which, when the apparatus is hung to a Wall or placed on the floor, has its longer side extending parallel to the floor.
  • the mixing chamber is situated at the middle of the top portion of the apparatus, leaving two lateral regions free. The latter enclose the heat exchanger facing the front of the apparatus and fluid pipes supply the heat exchanger accommodated by a recess facing the back of the apparatus.
  • the improved arrangement is advantageous, inasmuch as it permits, more particularly with a plurality of apparatuses in a side-byside arrangement, full freedom in securing to the wall the supply pipes for the heat exchangers and arranging in said pipes the taps for the various apparatuses which are then placed in front of the pipes assembled and insulated.
  • Such arrangement of the supply pipes for the heat exchangers is further advantageous in that it avoids laying said pipes in the floor or ceiling where the pipes would hardly be accessible and a useful space would be lost in a vertical direction for disguising the pipes.
  • a further characteristic feature of the improved apparatus resides in the use of the heat exchanger of small height, preferably not exceeding 20 cm., without detrimentally reducing its front area and heat exchange surface, the heat exchanger being therefore, its front area being the same, greater in length than present constructions.
  • the improved apparatus affords a heat exchanger of reduced height having, with respect to conventional apparatuses with a heat exchanger of greater height, an improved induction ratio, that is an improved ratio of induced air to primary air, for the following reasons:
  • the secondary air volume is further increased because the heat exchanger of greater length and smaller height increases the available area for the flow of secondary air at the region nearest the nozzles, at which the induction effect is greatest.
  • a further object of this invention is to arrange the nozzles and heat exchanger on a wall sloping towards the room through an angle of 5 to 15 to the horizontal.
  • the injection nozzles and heat exchanger are mounted in parallel relationship, their axes being perpendicular to said wall, so that they are inclined forwardly towards the room through 5 to 15 to the vertical.
  • the wall carrying the nozzles and to which the heat exchanger is attached extends forwardly beyond the heat exchanger to form a sump connecting and discharging any condensate from ambient moisture which might be formed as a result of improper operation of the plant.
  • This sump is therefore situated at a freely accessible region outside the heat exchanger on the front of the apparatus, the water collecting therein by dripping along the inclined wall.
  • the slope of the wall carrying the nozzles and heat exchanger leaves between the heat exchanger and suction strainer for the secondary air a triangular space free, which is usefully employed for arranging the air filter and thermostat valve, thereby avoiding the necessity of increasing the depth of the conditioner.
  • a further feature of this invention resides in that the passage between the primary air supply chamber and silencing and expansion chamber is located at the lower portion of the partition between both chambers, said passage extending throughout the length of the apparatus.
  • the passage extending throughout the length of the a paratus allows of air displacement from its inlet into the silencing and expansion chamber up to the nozzle plane at very low rate of speed free from longitudinal delivery currents.
  • This circumstance as well as the arrangement of the air passage at the lowest portion of the partition between the high and low pressure chambers, hence most remote from the nozzles, permits of arranging in the expansion chamber an excellent extensive silencing labyrinth, through which air moves evenly without swirling, this insuring a thorough noiselessness and a highly uniform delivery beneath the nozzle plane.
  • Figure 1 is a perspective view of the apparatus
  • Figure 2 is a longitudinal section of view of the apparat'us on line IIII of Figure 3,
  • Figure 3 is a cross-sectional View of the apparatus on line III-III of Figure 2,
  • Figure 4 is a part cross-sectional view of the apparatus showing a further embodiment of the silencing labyrinth
  • Figure 5 is a detail view of a plate of the heat exchanger and Figure 6 is a cross sectional view of the heat exchanger plate.
  • the air-conditioner shown in Figures 1 to 3 comprises a basic body including the supply chamber 1, control valve 2, silencing and expansion chamber 3 extending adjacent the chamber 1 in the lower portion of the apparatus, injection nozzles 4, mixing chamber 5, heat exchanger 6 with automatic or manually operated adjusting valve 7 therefor and air filter 8.
  • the apparatus is completed by a cabinet comprising a frame 9 having a laterally oif-set top lid 10, a front panel 11, an inlet strainer 12 and an outlet strainer 13.
  • the apparatus shown in Figures 1 to 3 can be encased in either a vertical or horizontal position, the covering including appropriate encasing structures provided with strainers 12 and 13.
  • the primary air flows to the supply chamber 1 through a hose 39 connected with a central conditioning station, reaches the silencing and expansion chamber 3 through the adjusting valve 2 and passage 14 which, according to this invention, is situated in the lower portion of the chamber and extends throughout the length thereof.
  • the primary air reaches through the silencing labyrinth, established by the bafiies 15, the injection nozzles 4 through which it is injected in the mixing chamber 5 in which it induces from the surrounding through the inlet strainer 12, filter 8 and heat exchanger 6 a secondary air stream with which it becomes mixed, the mixture issuing through the outlet strainer 13 to the room to be conditioned.
  • the silencing labyrinth 15 is formed by one horizontal and two vertical battle sections extending throughout the length of the chamber, the air therein being twice deflected through 90 and twice deflected through 180.
  • the silencing labyrinth is formed by three horizontal baffles causing the air to be deflected three times through 180.
  • the chambers 1 and 3 extend lengthwise parallel with each other in a horizontal plane'at the lower region of the apparatus.
  • the mixing 'chamber likewise extends longitudinally in the middle reg-ion of the upper portion of the apparatus.
  • the heat 6 exchanger is of small height preferably not exceeding 20 cm.
  • the wall 16 carrying the injection nozzles 4 is inclined to the horizontal through an angle on, the slope amounting to 5 to 15
  • the wall 16 carries a seating for the heat exchanger and forms by an extension towards the front the sump 17 collecting the condensed water.
  • Both, nozzles 4 and heat exchanger 6, which extend parallel with each other and perpendicular to the slope 16, are inclined through angle on to the vertical. 1
  • the control valve 2 comprises a valve member 18 which can be calibrated by means of a calibrating device designated as a whole by 19, which becomes accessible upon removal of the strainer 13 through the top opening in the mixing chamber 5, so as to adjust the static pressure beneath the nozzles plane, hence the inflow of primary air to the nozzles.
  • a remote control 24, which is easily fitted to the left or right of the apparatus serves 'for closing or opening the valve upon opening of the lid 10 on the frame 9 beside the outlet strainer '13.
  • the adjusting valve for the heat exchanger and its control in the case of a manual control, or the thermostat, in the case of an automatic valve, are also accessible.
  • the thermostat valve 34 is arranged in the triangular clearance between the inlet strainer 12 and heat exchanger 6.
  • valve member 18 and control and calibrating means therefor are disclosed in a copending application Ser. No. 745,931 filed July 1, 1958 by the same applicant.
  • Figures 5 and 6 show in plan and sectional view, respectively, a detail of the plates of the exchanger 6.
  • the plates are formed with ribs 38 adapted to increase both the plate surface and turbulence of air through the exchanger, thereby improving heat exchange.
  • Figure 2 shows the special arrangement of theside walls 31 which close the lower portion of the apparatus enclosing the supply and expansion chambers.
  • the side walls are retracted with respect of the extreme end sections of the heat exchanger and leave two clearances free in which it is possible to arrange, without increasing the overall length of the apparatus, pipes 32 for connection, if desired, of the sum 17 to the discharge system and device 33 for levelling the apparatus on installing on the floor or to the wall.
  • Figures 1 to 3 further show the special construction of the cabinet frame 9.
  • the frame has a longitudinal plane of'syrnmetry (Fig. 3) and can therefore be assembled to easily carry out an apparatus with a lid for the control of the adjusting valves for the heat exchanger and primary air on the left or right side respectively.
  • an air conditioning apparatus of the induction type a horizontally elongated air box of a substantially rectangular cross-sectional shape, a mixing chamber overlyingthe air box, a longitudinally extending partition in the air box subdividing the interior of the latter into a plenum chamber and a silencing-expansion chamber, the last named chambers being vertically co-extensive in the box and being arranged in a mutual side-by-side relationship, a valve-controlled primary air passage from the plenum chamber to the silencing-expansion chamber extending through the said partition lengthwise thereof, a plurality ofbaffles extending in the silencing-expansion chamber lengthwise of the latter whereby, when seen in cross-sectional view, the silencing-expansion chamber is of a labyrinth shape, and primary air nozzle means connecting the labyrinth with a bottom section of the overlying mixing chamber.
  • an air conditioning apparatus of the induction type a horizontally elongated air box of a substantially rectangular cross-sectional shape, a mixing chamber overlying the air box, a longitudinally extending partition in the air box subdividing the interior of the latter into a plenum chamber and a silencing-expansion chamber, the last named chambers being vertically coextensive in the box and being arranged in a mutual side-by-side relationship, a primary air passage from the plenum chamber to the silencing-expansion chamber extending through the said partition lengthwise of the latter, a valve member for controlling the said primary air passage arranged in the plenum chamber, a plurality of baffies extending in the silencing-expansion chamber lengthwise of the latter whereby, when seen in cross-sectional view, the silencing expansion chamber is of a labyrinth shape, and primary air nozzle means connecting the labyrinth with a bottom section of the overlying mixing chamber.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Central Air Conditioning (AREA)
US746030A 1957-08-23 1958-07-01 Air-conditioning apparatus of the induction type Expired - Lifetime US2932956A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2932956X 1957-08-23

Publications (1)

Publication Number Publication Date
US2932956A true US2932956A (en) 1960-04-19

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ID=11436325

Family Applications (1)

Application Number Title Priority Date Filing Date
US746030A Expired - Lifetime US2932956A (en) 1957-08-23 1958-07-01 Air-conditioning apparatus of the induction type

Country Status (6)

Country Link
US (1) US2932956A (nl)
BE (1) BE570306A (nl)
CH (1) CH362822A (nl)
DE (1) DE1251492B (nl)
FR (1) FR1209500A (nl)
GB (1) GB852603A (nl)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091288A (en) * 1960-02-16 1963-05-28 Hipress Air Conditioning Of Am High pressure air conditioning system
DE1248262B (de) * 1962-04-12 1967-08-24 Moering & Steenaart N V Luftausblasvorrichtung
US3428118A (en) * 1965-12-10 1969-02-18 Carrier Corp Air conditioning units
US3455378A (en) * 1967-07-28 1969-07-15 Carrier Corp Induction-type room terminal
US3575234A (en) * 1969-08-22 1971-04-20 John J Dieckmann Heating and cooling systems
US4100964A (en) * 1976-03-31 1978-07-18 Mitco Corporation Induction ventilation system
US4956978A (en) * 1989-09-07 1990-09-18 Thermo King Corporation Transport refrigeration apparatus having sound reduction cover
US5299634A (en) * 1991-09-26 1994-04-05 Mitsubishi Denki Kabushiki Kaisha Indoor unit of a ventilation system, ventilation and air conditioner
US20190086104A1 (en) * 2013-02-20 2019-03-21 Air Distribution Technologies Ip, Llc Induction displacement unit
US11378325B2 (en) 2019-07-12 2022-07-05 Thetford Bv Refrigerator with noise reduction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109563A (en) * 1976-10-06 1978-08-29 Vapor Corporation Low noise fluid distributor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2324313A (en) * 1940-08-14 1943-07-13 Gen Electric Air conditioning apparatus
GB784828A (en) * 1955-04-15 1957-10-16 Sulzer Ag Air conditioning installations for rooms

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2324313A (en) * 1940-08-14 1943-07-13 Gen Electric Air conditioning apparatus
GB784828A (en) * 1955-04-15 1957-10-16 Sulzer Ag Air conditioning installations for rooms

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091288A (en) * 1960-02-16 1963-05-28 Hipress Air Conditioning Of Am High pressure air conditioning system
DE1248262B (de) * 1962-04-12 1967-08-24 Moering & Steenaart N V Luftausblasvorrichtung
US3428118A (en) * 1965-12-10 1969-02-18 Carrier Corp Air conditioning units
US3455378A (en) * 1967-07-28 1969-07-15 Carrier Corp Induction-type room terminal
US3575234A (en) * 1969-08-22 1971-04-20 John J Dieckmann Heating and cooling systems
US4100964A (en) * 1976-03-31 1978-07-18 Mitco Corporation Induction ventilation system
US4956978A (en) * 1989-09-07 1990-09-18 Thermo King Corporation Transport refrigeration apparatus having sound reduction cover
US5299634A (en) * 1991-09-26 1994-04-05 Mitsubishi Denki Kabushiki Kaisha Indoor unit of a ventilation system, ventilation and air conditioner
US20190086104A1 (en) * 2013-02-20 2019-03-21 Air Distribution Technologies Ip, Llc Induction displacement unit
US11668475B2 (en) * 2013-02-20 2023-06-06 Air Distribution Technologies Ip, Llc Induction displacement unit
US11378325B2 (en) 2019-07-12 2022-07-05 Thetford Bv Refrigerator with noise reduction

Also Published As

Publication number Publication date
GB852603A (en) 1960-10-26
FR1209500A (fr) 1960-03-02
DE1251492B (nl)
BE570306A (nl)
CH362822A (it) 1962-06-30

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