US3464487A - Air handling unit - Google Patents

Air handling unit Download PDF

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Publication number
US3464487A
US3464487A US680146A US3464487DA US3464487A US 3464487 A US3464487 A US 3464487A US 680146 A US680146 A US 680146A US 3464487D A US3464487D A US 3464487DA US 3464487 A US3464487 A US 3464487A
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United States
Prior art keywords
air
damper
air inlet
housing
unit
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
US680146A
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English (en)
Inventor
Harold E Gold
Paul E Hammann
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.)
American Air Filter Co Inc
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American Air Filter Co Inc
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Filing date
Publication date
Application filed by American Air Filter Co Inc filed Critical American Air Filter Co Inc
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Publication of US3464487A publication Critical patent/US3464487A/en
Assigned to WOODS KATHLEEN D., AS TRUSTEE, CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING ASSOCIATION AS TRUSTEE reassignment WOODS KATHLEEN D., AS TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIS-CHALMERS CORPORATION A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems

Definitions

  • An air inlet assembly for an air-conditioning unit which provides a damper arrangement to control both the quantity of air returned to the air conditioning unit from the space served by the unit and the quantity of fresh air supplied to the unit, and mix the two streams of air upstream of air-conditioning elements which can also be provided in the unit.
  • Previous air-conditioning apparatus to heat and/or cool air for a space to be served by the unit for example, multizone air handling units which can include air heating and air cooling means to provide selectively conditioned air to different locations within a building, have generally provided means for mixing fresh air with a selected quantity of air returned from the space served 'by the unit.
  • Various air inlet arrangements have been provided in such air conditioners to selectively regulate the quantity of air introduced to the air-conditioning apparatus, but such arrangements have generally not pro vided means for efiicient mixing of the return air and fresh air before redistribution to the spaces served by the unit.
  • the present invention recognizes that it is desirable to provide an air inlet chamber to thoroughly mix controlled portions of air returned from the served space with controlled portions of fresh air drawn into the unit before the air passes through the air-conditioning elements.
  • the present invention provides a straightforward air inlet arrangement for an air-conditioning apparatus which can include only two motor operated dampers and advantageously provides means for efiicient mixing of return air and fresh air streams prior to the introduction of combined streams to the air-conditioning elements of the unit. Therefore, each area served by the airconditioning apparatus is provided with a more uniform mixture of fresh air and return air.
  • the present invention further recognizes that by advantageously disposing the dampers controlling the fresh air supply and return air supply within the air inlet States Patent 0 m 3,464,487 Patented Sept. 2, 1969 chamber in partially facing relation, the two air streams are efiiciently mixed and large dampers can be used to reduce the pressure drop experienced by the air stream passing through the dampers so the capacity of the air moving equipment associated with the air-conditioning unit is increased.
  • the present invention provides an air inlet assembly to supply a stream of air to an airconditioning apparatus comprising: a housing having a return air inlet communicating with the space served by the air-conditioning apparatus, a fresh air inlet communicating with a source of fresh air, and an exhaust air outlet communicating with the return air inlet; means to supply air from the space served by the unit to the return air inlet and to supply fresh air to the fresh air inlet; first wall means, including first adjustable air damper means, disposed within the housing to define a return air inlet chamber within the housing communicating with the return air inlet and the exhaust air outlet; second wall means, including second adjustable damper means, disposed within the housing to define a fresh air inlet chamber communicating with the fresh air inlet wherein the second damper means is in partially facing relation with the first damper means so air emitted from the second damper means is directed into the stream of air emitted from the first damper means; damper operator means to selectively modulate the fisrt and second adjustable damper means to regulate the quantity of return air
  • FIGURE 1 is a perspective view, in section, of one example of an apparatus in accordance with the present invention.
  • FIGURE 2 is an elevational view, partly in section, of the apparatus shown in FIGURE 1;
  • FIGURE 3 is a view taken along a plane passing through line 3-3 of FIGURE 2.
  • FIGURE 1 The example of one air-conditioning device in accordance with the present invention as shown in FIGURE 1 includes a housing 1 having an air inlet section comprising a fresh air inlet 3, return air inlet 5, an exhaust air outlet 2, and first air flow control damper 4, and second air flow control damper 6 disposed within housing 1 as hereinafter described. Downstream of the air inlet assembly air treating elements can be provided in the housing and can include, for example, an air filter 16, air blowers 21, an air heating element 32, and air cooling element 33.
  • Housing 1 can include a framework 1b adapted to receive panels In and rest on base frame constructed of channel members 10 as shown.
  • An access door 1d can be provided to permit inspection and service of the unit and facilitate changing the air filter media as hereinafter described.
  • the unit is, advantageously, mounted in contiguous relation with the space to be served, for example, on the roof of a building with the return air inlet 5 in communicative relation with a return air manifold (not shown) from the spaces served by the unit.
  • first and second air control dampers 4 and 6 are disposed within the housing in partially facing relation so the stream of air emitted from return air damper 6 and fresh air damper 4 are mixed.
  • Damper 6 is disposed between wall members 13 and 13a which are connected to one end of the damper 6 and the wall of housing 1, respectively, to define a return air inlet chamber communicating with return air inlet 5 and exhaust air outlet 2 which is provided in housing 1.
  • Return air inlet 5 communicate with a return air manifold to return air from the space served by the unit.
  • Damper 4 is disposed within the housing and walls 12 and 12a, respectively, are provided to have one end to be connected to each end of damper 4 and to the wall of housing 1, as shown, to define a fresh air inlet chamber communicating with the fresh air inlet 3
  • a louver 3a, FIGURE 2 can be provided to cover fresh air inlet 3 to prevent admission of undesirable materials into housin 1.
  • Air flow through each damper assembly is controlled by the position of the individual damper blades 4a and 6a of the dampers.
  • the construction of both dampers 4 and 6 is similar in that blades 4a and 6a of both dampers pivot about shafts 7 to crank arms 8.
  • Each arm 8 is pivotably connected to an operator rod 9 so that the respective damper is opened and closed in response to movement of operator rod 9.
  • a motor operator 11 is provided to selectively adjust the air flow opening through each of the dampers and a linking rod 9a (FIGURE 2) is provided to connect motor operator 11 to each damper rod 9, as shown.
  • the damper motor operator is actuated in response to changes in temperature of the stream of mixed air admitted to downstream air conditioning elements 32, 33 to maintain a uniform selected temperature in the air stream.
  • the air temperature can be sensed by a thermal bulb 28 within housing 1, for example, downstream of filter 16 as shown, and the temperature is transmitted to the damper motor operator by means of a conduit 29 and damper motor 11 operates accordingly.
  • a fan 15 is provided adjacent the exhaust air outlet to exhaust return air from the air-conditioning unit and fan 15 can be adapted to be driven by a motor 15a as shown. It will be noted that a drop damper is provided to cover exhaust air outlet 2 and is opened in response to flow of air through the exhaust air outlet 2, for example when fan is operating. Damper 10 is closed when there is no air flow through outlet 2 and most of the re turn air received by the unit is recirculated through the unit.
  • an air filter 16 Downstream of the air inlet assembly, and before heating element 32 and cooling element 33, an air filter 16 is provided to remove particulate matter from the air stream passing through the unit.
  • the filter can be of the roll type and can include a filter media supply roll 14 and a filter media take-up roll 17 to provide a continuous sheet 16 of filter media, for example spun glass, transversely across the air flow path so that the entire air stream passes through the media.
  • Support means including a frame 19 having intermediate supports 18 can be provided to maintain the media in air filtering relation within the air-conditioning unit.
  • Media supply roll 14 and media take-up roll 17 can be journaled in bearing means 14a and 170, respectively, and media can be advanced from roll 14 to roll 17 by turning take-up roll 17, for example by crank means (not shown), to draw new media from the supply roll into the air filtering zone.
  • Idle rollers 20 can be provided at opposite edges of frame 19 to lend further support media 16 in air filtering relation.
  • take-up roll 17 can be removed through the opening provided by removable panel 1d and new roll 14 of media can be inserted through the opening to be received by journals 14a. The media is then threaded from roll 14 to roll 17.
  • indicator means (not shown) can be provided to signal the condition of the filter media and to give notification when the media has become clogged so clean media can be advanced into the air flow stream.
  • air blowers 21 can be provided within the unit to provide a stream of air through the air-conditioning unit.
  • blowers 21 and a drive motor 23 are carried by a chassis 22 as a compact unit.
  • Chassis 22 can be spring mounted to the air conditioner frame member for example by springs 26, to isolate housing 1 from vibrations associated with operation of the blower assembly.
  • the arrangement as shown, provides a single drive shaft 24 so that only one motor is required to operate blowers 21.
  • blowers 21 are located in housing 1 to provide induced draft through the air inlet and the air filtering sections, and forced draft through the air heating and cooling elements downstream of the blowers.
  • blowers 21 communicate with an opening in wall 27 and are sealed (by seals 31) along the edges to wall member 27, which extends transversely across the housing so all the air emitted from the blower passes through the opening in wall 27 to the downstream air heating and air cooling elements 32 and 33.
  • a horizontal panel member 35 extends from the lower side of air heating elements 32 to the upper side of air cooling element 33, as shown, to define lower and upper air flow paths 34, 38, respectively.
  • a horizontal panel member 37 extends downstream from the cooling element 33 and is joined to an outlet damper assembly in sealing relationship to prevent air flow from the upper flow path to the lower flow path, and vice versa, downstream of cooling element 33. While a heating element 32 as shown in the figures is a direct fired heater, it will be recognized that other type heating elements, for example hot water heat exchangers, can be provided.
  • the cooling element 33 shown in the example of the figures represents a refrigerant evaporator having a condensed refrigerant inlet 39 and an evaporated refrigerant outlet 41 which are connected to a refrigerant compressing and condensing arrangement (not shown).
  • the outlet damper assembly includes cooperative upper and lower dampers 41-4111 communicating with separate outlet chambers 42 defined between panels 44.
  • the upper and lower dampers 41-41:: are provided to selectively control flow of tempered air to the downstream chambers 42 and the air from each chamber 42 is supplied through duct means (not shown) to a different space served by the air-conditioning unit.
  • a damper motor 45 is provided for each outlet damper 41-4111 and can be operated by a remote control thermostat located in a space to be served by the air conditioner. The thermostats operate damper motors 45 to selectively modulate dampers 41-41a to admit proportioned flow of heated air from chamber 38 and cooled air from chamber 34 to provide a selected blend of tempered air in each chamber 42 to be supplied to the served space.
  • motor operator 11 modulates inlet dampers 4 and 6 to provide a stream of air to heating element 32 and cooling element 33 at a selected temperature.
  • inlet dampers 4 and 6 In situations when the outside temperature is in the range of the desired temperature in the served space so some spaces require cooling and others require heating both heating element 32 and cooling element 33 can be operated and the temperature of the air supplied to the space served by the unit is controlled by the position of dampers 41-41a which determine the temperature of the air admitted to chambers 42.
  • only air cooling element 33 or air heating element 32 can be operated so a part of the air stream passes over one of the elements 32 or 33 and the air stream passing through the other flow channel is not tempered.
  • the tempered air is then mixed with untempered air to provide the desired 7 temperature in each chamber 42.
  • Automatic cut-off switches (not shown) can be provided to control the operation of heating element 32 and cooling element 33 in accordance with selected changes in outside air temperature and heating load.
  • both air heating element 32 and air cooling element 33 can be turned off so the entire cooling effect required in the space served by the air-conditioning unit can be supplied by uncooled outside air and any heating effect can be supplied by mixing the outside air with a controlled quantity of return air so temperature regulation is controlled entirely by the inlet dampers and controller 11.
  • the air inlet damper assembly can be controlled by damper motor operator 11 to provide a minimum flow of fresh air at all times, regardless of whether the air flowing through the unit is heated or cooled.
  • An air inlet assembly to supply air to an air conditioning apparatus comprising: a generally rectangular housing defined by a top wall, bottom wall, spaced first and second side walls and an end wall having a return air inlet communicating with the space served by the air conditioning apparatus, a fresh air inlet communicating with a source of fresh air, and an exhaust air outlet communicating with said return air inlet; means to supply air from said space served by said unit to said return air inlet and to supply fresh air to said fresh air inlet; first damper wall means, including first adjustable air damper means, disposed within said housing and connected to said first side wall and said end Wall to define a return inlet chamber within said housing communicating with said return air inlet and said exhaust air outlet; second damper wall means, including second adjustable air damper means, disposed within said housing and connected with said second side wall and said end wall to define a fresh air inlet chamber communicating with said fresh air inlet, said first and second damper wall means being disposed in spaced converging relation so said second damper means is in partially facing relation with said first damper means and
  • the air inlet assembly of claim 1 including: operator means to selectively control said first and second adjustable damper means to regulate the quantity of return air and quantity of fresh air flowing through said first and second dampers; exhaust fan means disposed to blow exhaust air through said exhaust air outlet; and, control means to selectively operate said exhaust air fan in respouse to selected temperature of air passing through said housing.
  • An air inlet assembly to supply a stream of air to an air conditioning apparatus comprising: side wall means defining an elongate rectangular housing having a return air inlet adjacent a first end of said housing and communicating with the space served by the air conditioning apparatus, a fresh air inlet adjacent said first end of said housing communicating with a source of fresh air, and an exhaust air outlet communicating with said return air inlet; blower means disposed within said housing to induce return air flow from said space served by said unit through said return air inlet and to induce fresh air flow through said fresh air inlet; first wall means extending between two adjacent Walls of said housing at an oblique angle relative to the longitudinal axis of said housing and connected with said walls to form a return air chamber communicating with said return air inlet and said exhaust air outlet and including first adjustable air damper means to control the flow of return air to said blower means;

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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)
  • Air Conditioning Control Device (AREA)
  • Central Air Conditioning (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US680146A 1967-11-02 1967-11-02 Air handling unit Expired - Lifetime US3464487A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68014667A 1967-11-02 1967-11-02

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US3464487A true US3464487A (en) 1969-09-02

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US680146A Expired - Lifetime US3464487A (en) 1967-11-02 1967-11-02 Air handling unit

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US (1) US3464487A (enrdf_load_stackoverflow)
FR (1) FR1590493A (enrdf_load_stackoverflow)
GB (1) GB1253060A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960527A (en) * 1974-11-22 1976-06-01 Goettl Adam D Air delivery and treatment apparatus
US4378980A (en) * 1981-11-09 1983-04-05 James M. Hammond Gas borne particle filtering apparatus
US5062280A (en) * 1990-10-31 1991-11-05 Martin Sr Lendell Air conditioning apparatus
US5404934A (en) * 1992-05-19 1995-04-11 Currise & Carlson, Inc. Retrofit air conditioning system
US5664431A (en) * 1996-04-22 1997-09-09 Martin, Sr.; Lendell Drain pan
RU2147105C1 (ru) * 1999-08-23 2000-03-27 ООО НТЦ "Норд" Вентиляционная камера и способ ее работы
US20060048782A1 (en) * 2004-09-03 2006-03-09 Safety Tech International, Inc. Thin profile air purifying blower unit and filter cartridges, and method of use
US20110315345A1 (en) * 2010-03-09 2011-12-29 Yi-Hsiung Lin Indoor air conditioner able to carry out washing and cleaning automatically
US20210310692A1 (en) * 2020-04-06 2021-10-07 Boyjin Development LLC Hvac return unit with a direct jumper arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29812082U1 (de) 1998-07-07 1998-12-24 Kurfer, Herfried Peter, 81827 München Klimaanlage
DE102011081739A1 (de) * 2011-08-29 2013-02-28 Siemens Aktiengesellschaft Luftaufbereitungsvorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324782A (en) * 1964-12-28 1967-06-13 Lennox Ind Inc Air treating apparatus
US3367259A (en) * 1965-12-06 1968-02-06 Harlow D. Savage Jr. Air mixing apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324782A (en) * 1964-12-28 1967-06-13 Lennox Ind Inc Air treating apparatus
US3367259A (en) * 1965-12-06 1968-02-06 Harlow D. Savage Jr. Air mixing apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960527A (en) * 1974-11-22 1976-06-01 Goettl Adam D Air delivery and treatment apparatus
US4378980A (en) * 1981-11-09 1983-04-05 James M. Hammond Gas borne particle filtering apparatus
US5062280A (en) * 1990-10-31 1991-11-05 Martin Sr Lendell Air conditioning apparatus
US5404934A (en) * 1992-05-19 1995-04-11 Currise & Carlson, Inc. Retrofit air conditioning system
US5664431A (en) * 1996-04-22 1997-09-09 Martin, Sr.; Lendell Drain pan
RU2147105C1 (ru) * 1999-08-23 2000-03-27 ООО НТЦ "Норд" Вентиляционная камера и способ ее работы
US20060048782A1 (en) * 2004-09-03 2006-03-09 Safety Tech International, Inc. Thin profile air purifying blower unit and filter cartridges, and method of use
US7469699B2 (en) * 2004-09-03 2008-12-30 Tvi Corporation Thin profile air purifying blower unit and filter cartridges, and method of use
US20110315345A1 (en) * 2010-03-09 2011-12-29 Yi-Hsiung Lin Indoor air conditioner able to carry out washing and cleaning automatically
US20210310692A1 (en) * 2020-04-06 2021-10-07 Boyjin Development LLC Hvac return unit with a direct jumper arrangement
US12085302B2 (en) * 2020-04-06 2024-09-10 Boyjin Deveopment LLC HVAC return unit with a direct jumper arrangement

Also Published As

Publication number Publication date
GB1253060A (enrdf_load_stackoverflow) 1971-11-10
FR1590493A (enrdf_load_stackoverflow) 1970-04-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001

Effective date: 19830329

Owner name: WOODS KATHLEEN D., AS TRUSTEE

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001

Effective date: 19830329