EP2172715A2 - Dispositif de dérivation de bobine d'évaporateur pour système HVAC - Google Patents

Dispositif de dérivation de bobine d'évaporateur pour système HVAC Download PDF

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Publication number
EP2172715A2
EP2172715A2 EP09172211A EP09172211A EP2172715A2 EP 2172715 A2 EP2172715 A2 EP 2172715A2 EP 09172211 A EP09172211 A EP 09172211A EP 09172211 A EP09172211 A EP 09172211A EP 2172715 A2 EP2172715 A2 EP 2172715A2
Authority
EP
European Patent Office
Prior art keywords
bypass
doors
bypass device
air
lower door
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Withdrawn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
EP09172211A
Other languages
German (de)
English (en)
Inventor
Sylvain Castagne
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.)
Individual
Original Assignee
Individual
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
Priority claimed from US12/195,162 external-priority patent/US20090237698A1/en
Application filed by Individual filed Critical Individual
Publication of EP2172715A2 publication Critical patent/EP2172715A2/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Withdrawn legal-status Critical Current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
    • F24F13/08—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
    • 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

Definitions

  • the present invention relates generally to HVAC systems and specifically to a bypass device for an air conditioning or evaporator coil in an HVAC system.
  • the coil when cooling in the summer, becomes moist due to condensation and accumulates dust.
  • the coil must be cleaned approximately every three years, depending on the degree of use the coil sees. If not removed, the dust causes additional drag on the airflow, as well as potentially causing allergies in the building's occupants.
  • Some inventions intending to maintain a constant air-supply pressure have inserted a bypass and damper between the air supply outlet of the HVAC unit and the return air intake of such a unit to cause a recirculation of a quantity of air which may have been closed off by zone dampers or the like and to approximate a more uniform air supply pressure to the various zones.
  • the bypass damper has been controlled by an air pressure sensor, a velocity sensor or a barometric-type sensor associated with the air supply outlet of the HVAC unit.
  • the bypass damper is modulated according to the current drawn by the fan motor of the HVAC unit.
  • U.S. Patent 6,085,834 a variable damper is used in order to regulate the volume of air that is to be conditioned, which operates based on the characteristics of the outside ambient air.
  • the bypass device comprises one or more bypass diverters around an evaporator coil in an HVAC system, wherein one or more adjustable doors may be manipulated so as to close the air path through the evaporator coil and force air to flow through bypass diverters instead.
  • the one or more adjustable doors are adjustable using control arms and may be maintained in either a flow-through or bypass position, so as to permit the air flow to travel through the evaporator coil, or bypass the coil, as the operator chooses.
  • the control arms may alternatively be manipulated by a motor and connected to the thermostat so as to automatically select the appropriate position depending on the settings of the thermostat.
  • the air-conditioning bypass device is positioned on top of a furnace 10 within a residential ventilation system 20 with central air conditioning, around the air-conditioning evaporator coil 30.
  • the evaporator coil 30, with a generally triangular prismatic shape, is located in the path of the air flow, in the main channel 100 of the ventilation system 20.
  • the present embodiment consists of a first and a second bypass diverter 40, 50, extending as a semi-trapezoidal extension from the side of the ventilation system 20, one bypass diverter on either side of the evaporator coil 30.
  • Adjustable doors comprising of a first lower door 62 and a second lower door 64 are pivotally mounted along the lower vertices of the air conditioning coil, to which they are connected by means of a control arms.
  • the control arm 70 is connected to control arm lever 82, which may be manually manipulated to control the flow of air through the evaporator coil 30 and bypass diverters 40, 50, and which are designed so as to lock as each extreme of movement of the first lower door 62 is reached.
  • the control arm lever 82 may be unlocked with operator intervention and the control arm 82 and 94 cannot unintentionally release.
  • the control arm lever 84 controls the second lower door 64 with a control arm (not shown) similar to control arm 70.
  • the first upper door 92 and the second upper door 94 are made of a light material and mounted on piano hinges 95 so that they may easily pivot as a result of airflow. In another embodiment, the first and second upper doors are not present at all. In further embodiments, other means known to persons skilled in the art may be used to prevent the air flow, once having passed the evaporator coil by means of the bypass device, reversing into the air conditioning coil.
  • bypass diverters 40, 50 are shaped in such a way as to guide the airflow around the evaporator coil without impeding its flow.
  • the bypass diverter may be formed in the semi-trapezoidal shape shown, with or without rounded corners, or as a half-cylinder smoothed shape for facilitating laminar airflow, or any number of other functional shapes.
  • the position of the first and second lower doors determines which path is taken by the airflow.
  • the airflow is channeled through the evaporator coil, before being distributed through the building ventilation system.
  • the bypass units are engaged so as to divert the air flow around the evaporator coil.
  • Bypassing the evaporator coil in winter has several benefits for the ventilation system: (1) it reduces air drag since the evaporator coil is intended for maximum contact with the through-channeled air, thereby necessarily causing drag on the airflow; (2) the evaporator coil accumulates dust as a result of this surface area, which causes unpleasant odors, and bypassing said coil in the summer reduces these odors.
  • the position of the first lower door 62 and the second lower door 64 is adjusted by means of control arm levers 82 and 84 which project through the wall of the ventilation system 20 and may be adjusted manually or by a motor such that they may be oriented in either summer or winter position.
  • control arm levers 82 and 84 In summer mode the air conditioning is engaged and the evaporating coil is used, so the airflow is directed to flow through the coil.
  • the control arm levers 82 and 84 By moving the control arm levers 82 and 84 in an upper motion, the first lower door 62 and the second lower door 64 are positioned so as to close off a first and a second lower bypass diverter ports 105, 110 on either side.
  • This near-vertical position of the first lower door 62 and the second lower door 64 directs the air flow from the furnace 10 through the evaporator coil 30.
  • the first upper door 92 and the second door 94 are pushed up, rotating on piano hinges 95, into a vertical position by the airflow to close off a first and a second upper bypass diverter ports 125, 130 on either side, together directing the air through the main channel 100 to be distributed into the building ventilation system.
  • the first lower door 62 and the second lower door 64 are adjusted by the operatively connected control arm lever 82 and control arm lever 84 wherein by turning the operatively connected levers 82 and 84 in a downward motion, so that the lower doors are rotated to meet in the middle of the main channel and open the first and second lower bypass diverter ports 105, 110 on either side.
  • the lower doors together form a "V"-shape, so as to direct the air flow from the furnace into the bypass diverter ports 105, 110, and preventing any air flow from entering the evaporator coil 30 in the main channel 100.
  • the lower doors may form a substantial air flow seal simply by meeting in the middle, or in other embodiments they may have heat-resistant rubber lips which meet, or they may effect a seal using a lip, wherein the first lower door is slightly shorter than the second lower door, and the second door containing a metal folded lip at the end which catches the slightly shorter first lower door.
  • the control arm levers 82 and 84 lock in this lower position, in that they do not release without operator intervention.
  • the air then passes through the first and second bypass diverters 40, 50 after which it re-enters the main channel 100 by means of the first and second upper bypass diverter ports 125, 130.
  • the air flow pressure causes the first upper door 92 and the second upper door 94 to be pushed flat on the upper sides of the evaporator coil 30.
  • the first and second upper door 92 and 94 rotating by means of piano hinge 95, is of sufficient size to substantially cover its respective upper side of the evaporator coil 30.
  • the upper doors are also held to the evaporator coil 30 by means of gravity, and prevent air flow out of the upper bypass diverter ports 125, 130 from reversing into the air conditioning coil 30, which is effectively isolated from the air flow by means of the winter position of said upper doors 90.
  • In winter mode due to the position of the first and second lower doors 62 and 64, there is no airflow through the air conditioning coil, resulting in more efficient air flow throughput as well as lower dust accumulation of the air conditioning coil, reducing the need for cleaning.
  • the control arm levers 82 and 84 may be manipulated manually or may be controlled by a first and a second servo motor, which would be operatively connected with the control arm levers 82 and 84, as would be familiar to one skilled in the relevant art.
  • the motors may further be interconnected with a building's thermostat, so that it automatically chooses the appropriate position for the control arm levers, depending on the thermostat settings.
  • actuators will open the first and second lower doors if a mechanical failure occurs in the servo motors operatively connected to the first and second lower door.
  • an access door is positioned within the ventilation system in order to allow access to the air conditioning coil and the addition of a control panel would be known by a worker skilled in the relevant art.
  • actuators will open the first and second lower doors if a mechanical failure occurs in the electrical

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
EP09172211A 2008-08-20 2009-10-05 Dispositif de dérivation de bobine d'évaporateur pour système HVAC Withdrawn EP2172715A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/195,162 US20090237698A1 (en) 2008-03-19 2008-08-20 Image processing device and initiating method therefor

Publications (1)

Publication Number Publication Date
EP2172715A2 true EP2172715A2 (fr) 2010-04-07

Family

ID=41557576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09172211A Withdrawn EP2172715A2 (fr) 2008-08-20 2009-10-05 Dispositif de dérivation de bobine d'évaporateur pour système HVAC

Country Status (1)

Country Link
EP (1) EP2172715A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487363A (en) 1982-10-14 1984-12-11 Parker Electronics, Inc. Bypass control system to maintain a constant air supply pressure in a HVAC duct system
US6085834A (en) 1998-09-24 2000-07-11 Munters Corporation Air handling system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487363A (en) 1982-10-14 1984-12-11 Parker Electronics, Inc. Bypass control system to maintain a constant air supply pressure in a HVAC duct system
US6085834A (en) 1998-09-24 2000-07-11 Munters Corporation Air handling system

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