METHOD AND APPARATUS FOR PASSIVELY CONTROLLING AIRFLOW
A system and method for providing a substantially constant volume exhaust or ventilation air terminal system is shown for controlling exhaust and/or return airflow rates in a system having a central fan or ventilator. The system and method permits zone-by-zone or area-by-area airflow regulation or control in non-demand areas in response to a demand or call for ventilation in demand areas. In one embodiment, the system employs at least one constant airflow controller or regulator situated in a damper. In one embodiment, a terminal houses a plurality of sub-ducts each having an airflow regulator. At least one of the sub-ducts has a damper. When the damper is open, a maximum airflow through the terminal is a sum of maximum airflow permitted by the regulators.
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This application is a continuation of U.S. patent application Ser. No. 14/075,514 filed Nov. 8, 2013, issued as U.S. Pat. No. 9,759,442, which is a continuation-in-part of U.S. patent application Ser. No. 12/783,826 filed May 20, 2010, issued as U.S. Pat. No. 9,201,428, which is a division of U.S. patent application Ser. No. 11/318,682 filed Dec. 27, 2005, now issued as U.S. Pat. No. 7,766,734, to which Applicant claims the benefit of the earlier filing date.
BACKGROUND OF THE INVENTION 1. Field of the InventionThis invention relates to a method and apparatus for controlling airflow and, more particularly, a method and apparatus for controlling air distribution in fan assisted central exhaust and/or return air ventilating systems.
2. Description of the Related ArtGenerally, central ventilation fans and ventilators used for the purpose of removing or exhausting air from areas in a building or structure, such as bathrooms, utility closets, kitchens in homes, offices, and other areas, will simultaneously remove air from fixed inlet terminals connected to the central ventilation fan whenever the fan is operating. Whether the fan operates intermittently or continuously, this results in excessive energy consumption as a result of removing heated and conditioned air from spaces that may not require ventilation simply because the demand for ventilation exists in one or more of the areas.
Previous attempts to limit a central fan or ventilation system to ventilating only occupied areas by opening and closing terminal devices, caused fluctuations in duct air pressure, and ultimately caused a shift in the amount of air removed or delivered to one or more of the areas or zones. This resulted in excessive ventilation rates and excessive energy usage in some areas and under-ventilating other areas, which in turn, caused poor indoor air quality related problems and a failure to meet minimum building code requirements in some instances.
Controlling the central fan speed or revolution per minute (RPM) to prevent the over or under-ventilation problem in zoned systems has been difficult, expensive and generally ineffective in the past. The typical fan control method involved monitoring either main duct pressure or the number of open zones to determine the total amount of airflow needed. However, a problem remained in that controlling the total system airflow does not ensure proper and/or constant airflow amounts at each zone branched duct.
Moreover, controlling airflow rates at each zone or branched duct in a supply air system has been accomplished using variable air volume (VAV) terminals. These VAV terminals were designed to vary the airflow rates in response to temperature needs. While VAV terminals have the capability to control airflow at constant levels, they typically utilized an electrically or pneumatically powered control device that monitors duct pressure through a pilot tube and sends a signal to a separate zone damper. These control devices required a separate power source, separate parts, and direct coupling to, among other things, a damper actuator to allow for responsive zoned airflow control. If the VAV control device loses power, it will also lose it ability to control airflow.
What is needed, therefore, is a system and method for controlling air distribution in both fan assisted central exhaust systems and/or return air ventilating systems that facilitates overcoming one or more of the problems of the prior art.
SUMMARY OF THE INVENTIONIt is therefore an object of one embodiment of the invention to provide a ventilation terminal system and device with an integral primary zone controlled damper that regulates airflow in response to a switch, dehumidistat, light sensor, motion sensor, CO2 sensor or the like.
An object of another embodiment is to provide a ventilation terminal device and system with a pressure independent flow control device that is integral to the primary flow control, which in one embodiment may be a damper.
Another object of another embodiment of the invention is to provide a flow control device and system that regulates airflow to substantially constant levels when exposed to varying duct pressures.
Still another object of another embodiment of the invention is to provide a flow control device and system that is mechanically removed from an airflow stream when the primary control device is caused to permit airflow to a predetermined demand level.
Still another object of another embodiment of the invention is to provide a control device for situating in an airflow stream to regulate or control airflow to a substantially constant or predetermined maximum rate.
Yet another object of another embodiment is to provide a system and method having a first control device that controls or regulates flow to a first substantially constant or predetermined rate, while another flow control device controls or regulates flow to a second predetermined level or rate.
Still another object of another embodiment of the invention is to provide at least one or a plurality of flow control devices that require no direct electric or pneumatic power source, but rather, utilize only system duct pressure to regulate airflow to first and/or second predetermined levels, respectively.
Still another object of another embodiment of the invention is to provide a minimum flow control device that will continue to operate if a primary flow control device cannot be actuated to permit increasing airflow or it loses power.
Still another object of another embodiment of the invention is to provide a ventilation control assembly and system that can be easily maintained and/or removed from a terminal housing without disconnecting the terminal to which the assembly is attached from any duct or ventilation shaft.
Still another object of another embodiment of the invention is to provide a system that is small enough to be mounted between floors, and/or ceiling assemblies, such as assemblies constructed of nominal 10″ joists on 16″ centers.
Another object of another embodiment of the invention is to provide an assembly that utilizes a damper drive-motor powered by 120 volt, 24 volt, 12 volt, or 220 volt AC or other suitable electrical voltage supply.
Yet another object of another embodiment of the invention is to provide a device that reduces or eliminates the need for routine maintenance of the type that is required by mechanical or electrical systems of the past.
Still another object of another embodiment of the invention is to provide a device that can be easily mounted in a fire or non-fire rated ceiling or wall assembly.
Yet another object of another embodiment of the invention is to provide a device that will reduce the necessary central fan horsepower requirements and will facilitate saving on energy consumption by reducing the overall fan or ventilator requirements in the system.
In one aspect, an embodiment of the invention comprises a zone control exhaust terminal comprising a housing having a first opening coupled to a duct and a second opening associated with an area to be ventilated, the housing directing airflow from the inlet to the outlet along a predetermined path and a damper hingeably coupled to the housing for controlling airflow between the area and a fan or ventilator, a motor for driving the damper from a closed position at which the damper becomes situated in the predetermined path and an open position at which the damper permits airflow along the predetermined path in response to a motor control signal and an airflow regulator situated in the predetermined path, the airflow regulator regulating airflow along the predetermined path when the damper is in the closed position.
In another aspect, another embodiment of the invention comprises a zone control ventilation system for use in a building having a plurality of areas to be ventilated, the system comprising at least one fan unit for generating airflow, a plurality of ducts coupled to at least one fan unit; a plurality of zone control exhaust terminals coupled to each of the plurality of ducts, respectively, and operatively associated with each of the plurality of areas each of the plurality of zone control exhaust terminals comprising a housing having an inlet coupled to a duct and an outlet associated with at least one of the plurality of areas to be ventilated, a damper pivotally coupled to the housing, a motor for driving the damper between a closed position and an open position at which the damper permits airflow between at least one fan unit and at least one plurality of areas and into at least one of the plurality of areas to be ventilated in response to a motor control signal, and an airflow regulator situated in an airflow path, the airflow regulator for regulating an airflow rate along the airflow path between the room and at least one fan unit.
In another aspect, another embodiment of the invention comprises a method for maintaining a substantially constant airflow in a ventilation system having a plurality of ducts, the method comprising the steps of passively regulating airflow at a first rate through the plurality of ducts and causing airflow through at least one of the plurality of ducts at a second rate in response to a demand signal as the airflow through the other of the plurality of ducts continues to flow at the first rate.
In yet another aspect, another embodiment of the invention comprises a method for controlling airflow through a plurality of ducts coupled to a ventilator, comprising the steps of permitting airflow from the ventilator through at least one of the plurality of ducts at a substantially constant rate and permitting airflow through at least one of the plurality of ducts to an area at a demand rate that is greater than the substantially constant rate in response to a demand signal.
In still another aspect, another embodiment of the invention comprises a method for providing zone-by-zone airflow regulation for regulating airflow to substantially constant levels, comprising the steps of controlling airflow substantially constant through a plurality of terminals associated with areas where no ventilation airflow is demanded at a first rate and controlling airflow through said terminal at a second rate, which is higher than said first rate in areas where ventilation airflow is demanded in response to an airflow demand at a demand rate.
In yet another aspect, another embodiment of the invention is to provide a method for regulating airflow to a plurality of zones of a building having a fan, comprising the steps of situating a primary regulator in operative relationship with each of said plurality of zones to regulate airflow between each of said plurality of zones and said fan and situating at least one constant airflow regulator in operative relationship with each of said primary regulators in order to regulate airflow between each of said plurality of zones and said fan such that when said primary regulator permits a demand airflow between one of said plurality of zones and said fan, said at least one constant airflow regulators control or regulate airflow such that airflow to at least the other of said plurality of zones is substantially constant.
In still another aspect, another embodiment of the invention is to provide a method for regulating airflow to a substantially constant level in each of a plurality of zones in a structure, said structure comprising an airflow generator and at least one conduit for providing fluid communication between each of said plurality of zones and said airflow generator and said method comprising the steps of causing airflow to a demand level in any of said plurality of zones where airflow to said demand level is demanded and regulating airflow to a substantially constant level in the other of said plurality of zones where airflow to a demand level is not demanded.
In yet another aspect, another embodiment of the invention comprises a system for regulating airflow in a structure having a plurality of zones and said system comprising an airflow generator and a plurality of terminals associated with each of said plurality of zones, respectively a conduit for coupling said airflow generator to each of said plurality of terminals a plurality of primary regulators coupled to said plurality of terminals, respectively, for causing airflow to a demand level in one of said plurality of zones in response to a demand and a plurality of first constant airflow regulators situated between each of said plurality of zones, respectively, and said airflow generator to regulate airflow between said airflow generator and those other plurality of zones where demand airflow is not demanded to a first predetermined level.
In another aspect, another embodiment comprises a damper assembly for use in a ventilation system having an airflow generator, a terminal associated with an area to be ventilated, and a duct for coupling the airflow generator to the terminal, the damper assembly comprising: a support, a damper pivotally coupled to one support, a motor mounted on the support for driving said damper between a closed position and an open position and the damper assembly being detachably secured and removable from the system without dismantling or disconnecting either the duct or the terminal.
In yet another aspect, another embodiment of the invention comprises a zone control terminal for use in an air distribution system, the zone control terminal comprising a housing having an entry opening for receiving airflow and an exit opening, a damper hingeably coupled to the housing and situated between the entry opening and the exit opening, a motor for driving the damper between an open position and a closed position, at least one first airflow regulator that is not situated in series with the damper, at least one second airflow regulator situated in series with the damper, wherein the at least one first airflow regulator controls or permits a predetermined minimum amount of airflow through the housing when the damper is in the closed position and the at least one second airflow regulator cooperating with the at least one first airflow regulator to control or permit a predetermined maximum amount of airflow through the housing when the damper is in the open position, the predetermined maximum amount of airflow through the zone control terminal being a sum of a maximum airflow rate of the at least one first airflow regulator and a maximum airflow rate of the at least one second airflow regulator.
In still another aspect, another embodiment of the invention comprises a system for regulating airflow is a structure having a plurality of zones, the system comprising a plurality of terminals associated with each of the plurality of zones, respectively, at least one conduit for coupling an airflow generator to each of the plurality of terminals, each of the plurality of terminals comprising a housing having an entry opening for receiving airflow and an exit opening, a damper hingeably coupled to the housing and situated between the entry opening and the exit opening, a motor for driving the damper between an open position and a closed position, the motor being responsive to an airflow demand, at least one first airflow regulator situated in each of the plurality of terminals, at least one second airflow regulator situated in series with the damper, wherein the at least one first airflow regulator controls or permits a first predetermined amount of airflow and the damper and at least one second airflow regulator cooperating with the at least one first airflow regulator to control or permit a second predetermined amount of airflow through the housing when the damper is in the open position, the second predetermined amount of airflow through the plurality of terminals, the second predetermined amount of airflow being a sum of a maximum airflow rate of the at least one first airflow regulator and a maximum airflow rate of the at least one second airflow regulator.
In another aspect, another embodiment of the invention comprises a zone control system for use in a structure having a plurality of zones, the zone control system comprising a plurality of terminals associated with each of the plurality of zones, respectively, the plurality of terminals being adapted to receive airflow from an airflow generator, each of the plurality of terminals comprising a housing having an entry opening for receiving airflow and an exit opening, a damper hingeably coupled to the housing and situated between the entry opening and the exit opening, a motor for driving the damper between an open position and a closed position, the motor being responsive to a demand, at least one first airflow regulator situated in parallel with the damper, at least one second airflow regulator situated in series with the damper, wherein when the damper is in the closed position the at least one first airflow regulator permits airflow to a first predetermined level and when the damper is in the open position, the at least one first airflow regulator cooperates with the at least one second airflow regulator to permit airflow to a second predetermined level.
These are illustrative objects. Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
Referring now to
The system 10 comprises at least one fan 16 (
The system 10 further comprises a plurality of ducts 18 that are coupled directly to the at least one fan 16 or ventilator 17, as illustrated in
Also, while the illustration shown in
Referring to
As illustrated in
The system 10 further comprises an air restrictor or damper assembly 40 which will now be described relative to
The generally U-shaped member or support 42 is received in the area 34 (
It should be noted that the damper 58 is operatively associated with and situated adjacent to an opening 32 (
In one embodiment shown in
One feature and advantage of this design illustrated in
Returning to
Referring to
It should be understood that the constant airflow regulators 72 and 74 may comprise different specifications in a preferred embodiment and they both provide constant airflow regulation. For example, the constant airflow regulators 72 and 74 provide constant airflow regulation by operation of the vane 72a (
In the embodiments shown in
Typical airflow versus pressure difference characteristics are graphically illustrated by the graphs under each terminal 22 in
Returning to
It should be understood that one or both of the constant airflow regulators 72 and 74 may be used in various combinations, such as the illustrative combinations that will now be described relative to
In the embodiment shown in
Thus, the system 10 in the embodiments in
When the damper 58 in
Referring back to
Comparing the embodiment of
In contrast, the embodiment in
Thus, it should be understood that the system 10 may be provided with one or more constant airflow regulators 72 and 74 in various combinations and arrangements with damper 58 that is solid or that has a regulator 72 mounted therein to regulate or control airflow to a substantially constant minimum and/or maximum level in the areas 14. On demand, the damper 58 may be actuated from the closed to the open position when the user desires to have increased airflow, such as ventilation airflow, in the zone or area 14, such as a bathroom.
It should be understood that the regulators 71-74 and features of the various embodiments in
As mentioned earlier, it should be understood that while the system 10 and method have been shown utilizing the switch 54 that may be actuated by the user, other means for energizing and actuating the motor 52 to drive the damper 58 from the closed position to the open position may be used. For example, the system 10 may utilize any suitable means for providing a motor control signal for controlling the motor 52, such as the switch 54, a dehumidistat or occupancy sensor that senses when an occupant has entered or left a room, a timer, a CO2 sensor, or any combination of the aforementioned means.
Advantageously, one feature of the embodiments illustrated is that it provides ventilation airflow regulation or control from the zones or areas 14 through at least one or a plurality of the ducts 18 to a maximum airflow rate or less or between minimum and maximum airflow rates. Note that the step of permitting airflow from the fan 16 or ventilator 17 is performed passively utilizing one or more of the constant airflow regulators 72 or 74.
Advantageously, the aforementioned embodiments provide a primary flow controller or regulator in the form of the damper 58 and at least one or a plurality of other flow controllers or regulators, such as the constant airflow regulators 71 and 72. These airflow regulators may be used alone or in combination with another constant airflow regulator 73 or 74.
As mentioned earlier, one advantage of the embodiment of
The housing 24 does not have to be disconnected from the duct 18 if it is necessary to make any repairs or maintenance. The flow control device, such as regulators 72 and 74, require no direct electrical or pneumatic power source, and can regulate and control the airflow by utilizing only system duct pressure. Thus, even if there is no power to switch 54 or motor 52, the regulators 72 and/or 74 will continue to regulate airflow.
Another feature of one embodiment is the small size of the terminal 22, which has dimensions of 10″×10″×8″. The terminal 22 is capable of being mounted between floor, and ceiling assemblies, such as those constructed of standard joists on 16″ centers.
Because the system 10 is capable of regulating and controlling airflow in the various zones or areas 14 on an as needed basis, the overall capacity requirements of the central fan 16 and/or ventilator 17 can be reduced because the system 10 is capable of providing constant airflow in non-demand areas 14 and airflow at a demand rate in those areas where increased airflow or ventilation is demanded. This enables a smaller fan 16 or ventilator to be utilized in the system 10.
The system 10 advantageously provides a flow control device that regulates airflow to constant levels when exposed to varying duct pressure.
Referring now to
The embodiment of
Referring now to
As with prior embodiments, the ducts 18′ may be coupled to at least one or a plurality of zone control terminals 102, at least one of which is operatively associated with each of the areas 14′ to be ventilated. As with prior embodiments, a single zone control terminal 102 may be associated with each of the areas 14′, but it should be understood that more than one of the plurality of zone control terminals 102 may be associated with each of the areas 14′. Also, and as mentioned earlier herein, not every zone or area 14′ in the building, structure or residence 12′ must have one or more of the plurality of zone control terminals 102, although in a preferred embodiment at least one of the plurality of control terminals 102 is associated with each of the areas 14′. In the illustration shown in
The zone control terminal 102 comprises the first or upstream end 102a and the second or downstream end 102b. Note that an inner surface 106a of wall 106, inner surface 110a of wall 110, inner surface 108a of wall 108 and an inner surface 116a of a flange or projection 116 cooperates with the wall or access cover 112 to provide a generally closed zone control terminal 102 when the wall or access cover 112 is in the closed position, but that is open at the downstream end 102b. An internal wall 114 having a first side 114a and opposing second side 114b is conventionally secured, such as by a weld, fasteners (not shown) or adhesive, to the inner surfaces 106a, 108a and 110a. Note that portions of ends 106b (
A downward extending support rib or flange 120 (
In the illustration being described, a first cut out 114a (
Advantageously, the embodiment being described shows the housing 103 that defines a duct that houses a plurality of ducts, namely, the sub-ducts or duct extensions 130 and 132. As mentioned later herein, the sub-ducts or duct extensions 130 and 132 could be the same size, shape or dimension, but as shown, it should be understood that they could be adapted to be different sizes, areas, shapes or dimensions. For example, they could be different lengths, diameter, size or the like.
In the illustration being described, the generally elongated cylindrical portions 130b and 132b of sub-ducts or duct extensions 130 and 132 each house and comprise at least one or a plurality of air regulators, such as a constant airflow regulator of the type mentioned earlier herein. In this regard, note that the sub-ducts or duct extensions 130 and 132 comprises at least one constant airflow regulators 140 and 146, respectively, which operate substantially as described earlier herein relative to the constant airflow regulators of the embodiments previously described.
In the illustration being described, the sub-duct or duct extension 130 also comprises at least one damper 142 comprises a securing bracket 142a (
Note that the sub-duct or duct extension 130 also comprises the at least one second airflow regulator 146. The operation and function of the sub-duct or duct extension 130 and the damper 142 and at least one second airflow regulator 146 is similar to that described earlier herein relative to the illustrative example shown in
The sub-duct or duct extension 132 also comprises at least one first airflow regulator 140 and functions to control a minimum and maximum amount of airflow through the zone control terminal 102, even when the damper 142 is in the closed position shown in
Thus, it should be understood that the at least one second airflow regulator 146 is always in series with the damper 142 and in parallel with the at least one first airflow regulator 140 when the damper 142 is open, and the maximum airflow rate permitted to flow through the zone control terminal 102 is the maximum airflow rate of the sum of the at least one first airflow regulator 140 and the at least one second airflow regulator 146. For example, if each of the at least one first and second airflow regulators 140 and 146 had specifications of permitting airflow between 10-175 CFM, then when the damper 142 is in the closed position illustrated in
Advantageously, the airflow regulators 140, 146 may have the same specifications, but more typically, they have different minimum and maximum airflow rate specifications may be utilized in this embodiment. This may be advantageous for customizing or adapting the zone control terminal 102 to particular environments or structures. For example, in an environment or room (e.g., an auditorium in a building) that is normally unused, but suddenly becomes filled with people, it may be desired to provide a high maximum airflow rate that permits a large airflow through the zone control terminal 102.
It should also be understood that one or more features of the embodiments described earlier herein may be utilized with the embodiment shown in
It should also be understood that the sub-ducts or duct extensions 130, 132 can take other shapes and forms and can be the same or different sizes. In the illustration shown in
Referring back to
During use, the damper 142 may be normally closed (
Advantageously, the system and method of the embodiment of
As mentioned earlier, it should be understood that the zone control terminal 102 could be provided with more sub-ducts or duct extensions if desired and those sub-ducts or duct extensions may comprise airflow regulators and dampers as described herein relative to the embodiment of
While the system, apparatus and method herein described constitute preferred embodiments of this invention, it is to be understood that the invention is not limited to this precise system, apparatus and method, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.
Claims
1. A zone control terminal for use in an air distribution system, said zone control terminal comprising:
- a housing having an entry opening for receiving airflow and an exit opening;
- a damper hingeably coupled to said housing and situated between said entry opening and said exit opening;
- a motor for driving said damper between an open position and a closed position;
- at least one first airflow regulator that is not situated in series with said damper;
- at least one second airflow regulator situated in series with said damper;
- wherein said at least one first airflow regulator controls or permits a predetermined minimum amount of airflow through said housing when said damper is in said closed position and said at least one second airflow regulator cooperating with said at least one first airflow regulator to control or permit a predetermined maximum amount of airflow through said housing when said damper is in said open position, said predetermined maximum amount of airflow through said zone control terminal being a sum of a maximum airflow rate of said at least one first airflow regulator and a maximum airflow rate of said at least one second airflow regulator.
2. The zone control terminal as recited in claim 1 wherein said at least one first airflow regulator is a constant airflow regulator over a varying range of pressure.
3. The zone control terminal as recited in claim 1 wherein said at least one second airflow regulator is a constant airflow regulator over a varying range of pressure.
4. The zone control terminal as recited in claim 2 wherein said at least one second airflow regulator is also a constant airflow regulator over a varying range of pressure.
5. The zone control terminal as recited in claim 1 wherein said at least one second airflow regulator is situated in a duct, said damper being operatively associated with said duct so that when said damper is in said closed position, no airflow passes through said at least one second airflow regulator.
6. The zone control terminal as recited in claim 1 wherein when said damper is in said closed position, said airflow passes through said at least one first airflow regulator and does not pass through said at least one second airflow regulator.
7. The zone control terminal as recited in claim 1 wherein when said damper is in said open position, said airflow passes through said at least one first airflow regulator and also passes through said at least one second airflow regulator to permit said predetermined maximum amount of airflow through said zone control terminal.
8. The zone control terminal as recited in claim 1 wherein said damper and said at least one second airflow regulator are situated in a common sub-duct or duct member.
9. The zone control terminal as recited in claim 1 wherein said at least one first airflow regulator is situated in a sub-duct or duct extension in said housing independent of said damper and said at least one second airflow regulator.
10. The zone control terminal as recited in claim 8 wherein said housing comprises a wall having a first aperture and a second aperture, said at least one first airflow regulator being adapted to regulate airflow through said first aperture and said at least one second airflow regulator and said damper being adapted to regulate airflow through said second aperture.
11. The zone control terminal as recited in claim 10 wherein a first sub-duct or duct member is coupled to said wall and in communication with said first aperture and at least one first airflow regulator is situated in said first sub-duct or duct member.
12. The zone control terminal as recited in claim 10 wherein a second sub-duct or duct member is coupled to said wall and in communication with said second aperture and having at least one of said damper or said at least one first airflow regulator situated in said second sub-duct or duct member.
13. The zone control terminal as recited in claim 12 wherein both said damper and said at least one second airflow regulator are situated in said second sub-duct or duct member.
14. The zone control terminal as recited in claim 12 wherein said first sub-duct or duct member is situated adjacent said second sub-duct or duct member is said housing.
15. The zone control terminal as recited in claim 1 wherein said zone control terminal further comprises at least one third airflow regulator situated in said damper.
16. The zone control terminal as recited in claim 1 wherein a maximum airflow rate of said at least one first airflow regulator is different than a maximum airflow rate of said at least one second airflow regulator.
17. The zone control terminal as recited in claim 16 wherein a maximum airflow rate of said at least one first airflow regulator is less than a maximum airflow rate of said at least one second airflow regulator.
18. The zone control terminal as recited in claim 1 wherein each of said at least one first airflow regulator and said at least one second airflow regulator comprises a single constant airflow regulator.
19. The zone control terminal as recited in claim 1 wherein said at least one first airflow regulator permits a minimum amount of airflow from an area in a structure.
20. The zone control terminal as recited in claim 19 wherein said minimum amount of airflow is at least 10 CFM.
21. The zone control terminal as recited in claim 1 wherein a motor control signal for energizing said motor is generated by at least one switch.
22. The zone control terminal as recited in claim 21 wherein said switch responds to at least one of a humidity sensor, manual control, timed mechanism, occupancy, or other indicators of presence.
23. The zone control terminal as recited in claim 1 wherein said damper actuates a damper switch in response to said motor driving said damper to said open position.
24. The zone control terminal as recited in claim 1 wherein said damper further comprises a pivot arm coupled to said motor and a spring mounted on said pivot arm for biasing said damper to said closed position.
25. The zone control terminal as recited in claim 1 wherein said housing defines a terminal duct, said zone control terminal further comprising:
- a first sub-duct, duct member or duct extension situated in said terminal duct;
- a second sub-duct, duct member or duct extension situated in said terminal duct;
- said first sub-duct, duct member or duct extension having said at least one first airflow regulator therein for regulating airflow through said first sub-duct, duct member or duct extension;
- said second sub-duct, duct member or duct extension having said at least one second airflow regulator therein for regulating airflow though said second sub-duct, duct member or duct extension;
- said damper being operatively coupled to or associated with said second sub-duct, duct member or duct extension to cause no airflow or airflow that is regulated by said at least one second airflow regulator to flow therethrough.
26. The zone control terminal as recited in claim 1 wherein both of said at least one first airflow regulator is located in a first sub-duct, duct member or duct extension and said at least one second airflow regulator is located in a second sub-duct, duct member or duct extension, each of said first and second sub-duct, duct member or duct extensions being located inside said housing so that said at least one first and second airflow regulators can control airflow through said housing.
27. The zone control terminal as recited in claim 1 wherein at least one said at least one first airflow regulator or said at least one second airflow regulator is located in a sub-duct, duct member or duct extension mounted inside said housing.
28. The zone control terminal as recited in claim 27 wherein said housing is generally rectangular and said sub-duct, duct member or duct extension is generally cylindrical.
29. The zone control terminal as recited in claim 28 wherein said housing has a wall defining a plurality of apertures, said zone control terminal comprising a plurality of sub-ducts, duct members or duct extensions associated with each of said plurality of apertures.
30. The zone control terminal as recited in claim 29, wherein said plurality of sub-ducts, duct members or duct extensions comprises two.
31. The zone control terminal as recited in claim 29, wherein said plurality of sub-ducts, duct members or duct extensions comprises more than two.
32. A zone control exhaust terminal comprising:
- a housing having a first opening coupled to a duct and a second opening associated with an area to be ventilated, said housing directing airflow from said inlet to said outlet along a predetermined path;
- a damper hingeably coupled to said housing for controlling airflow between said area and a fan or ventilator;
- a motor for driving said damper from a closed position at which said damper becomes situated in said predetermined path and an open position at which said damper permits airflow along said predetermined path in response to a motor control signal; and
- an airflow regulator situated in said predetermined path, said airflow regulator regulating airflow along said predetermined path at a first rate when said damper is in said closed position.
33. The zone control exhaust terminal as recited in claim 32 wherein said airflow regulator is dynamic constant airflow regulator over a varying range of pressure.
34. The zone control exhaust terminal as recited in claim 32 wherein said airflow regulator is integral with said damper.
35. The zone control exhaust terminal as recited in claim 34 wherein said damper is generally planar and pivots about a pivot axis, said airflow regulator being coupled to said damper such that it pivots about said pivot axis when said damper is actuated between said closed position and said open position.
36. The zone control exhaust terminal as recited in claim 34 wherein said damper is generally planar and lies in a first plane when said damper is in said closed position, said airflow regulator being coupled to said damper such that it also lies in said first plane and permits airflow through said damper at said first rate.
37. The zone control ventilation system as recited in claim 36 wherein said airflow regulator is a passively controlled constant airflow regulator over a varying pressure ranging between 0.20 and 0.80 inches W.G.
38. The zone control exhaust terminal as recited in claim 32 wherein said airflow regulator is situated in said duct.
39. The zone control exhaust terminal as recited in claim 32 wherein said airflow regulator is situated in said predetermined path when said damper is in said closed position and removed from said predetermined path when said motor actuates said damper to said open position.
40. The zone control exhaust terminal as recited in claim 34 wherein a second airflow regulator is situated in said duct.
41. The zone control exhaust terminal as recited in claim 32 wherein said airflow regulator permits a minimum amount of airflow from said area.
42. The zone control exhaust terminal as recited in claim 41 wherein said minimum amount of airflow is at least 10 CFM.
43. The zone control exhaust terminal as recited in claim 40 wherein said airflow regulator permits a minimum amount of airflow from said area through said duct and said second airflow regulator permits a maximum amount of airflow from said area.
44. The zone control exhaust terminal as recited in claim 43 wherein said minimum amount of airflow is at least 10 CFM and said maximum amount of airflow is less than 400 CFM.
45. The zone control exhaust terminal as recited in claim 32 wherein said motor control signal is generated by at least one of a switch.
46. The zone control exhaust terminal as recited in claim 45 wherein said switch responds to at least one of a humidity sensor, manual control, timed mechanism, occupancy, or other indicators of presence.
47. The zone control exhaust terminal as recited in claim 32 wherein said system further comprises a damper switch coupled to a remote fan for causing airflow in said duct, said damper switch being actuated when said damper is moved to said open position.
48. The zone control exhaust terminal as recited in claim 47 wherein said damper actuates said damper switch in response to said motor driving said damper to said open position.
49. The zone control exhaust terminal as recited in claim 32 wherein said damper further comprises a pivot arm coupled to said motor and a spring mounted on said pivot arm for biasing said damper to said closed position.
50. The zone control exhaust terminal as recited in claim 32 wherein said housing is dimensioned so that it can be mounted between joists.
51. The zone control exhaust terminal as recited in claim 32 wherein said damper, motor and air regulator may be detachably secured to said housing for maintenance without disconnecting said housing from said duct.
52. The zone control exhaust terminal as recited in claim 32 wherein said terminal further comprises a duct extension coupled to said housing in fluid communication with said first aperture;
- said constant airflow regulator being situated in said duct extension.
53. The zone control exhaust terminal as recited in claim 32 wherein said terminal further comprises:
- a duct extension coupled to said housing in fluid communication with said first aperture; and
- a second constant airflow regulator situated in said duct extension.
54. The zone control exhaust terminal as recited in claim 52 wherein said terminal further comprises:
- a fan switch mounted for generating a fan signal when said damper is actuated to said open position.
55. The zone control exhaust terminal as recited in claim 52 wherein said terminal further comprises:
- a fan switch mounted on said support;
- said fan switch being actuated by said damper when said damper is actuated to said open position.
Type: Application
Filed: Sep 6, 2017
Publication Date: Dec 21, 2017
Applicant: American Aldes Ventilation Corporation (Bradenton, FL)
Inventors: Dennis R. Dietz (Bradenton, FL), John Robert Harrell (Bradenton, FL), Dwight Ray Shackelford (Sarasota, FL)
Application Number: 15/696,461