US20120255720A1 - Temperature Controller for Unit - Google Patents
Temperature Controller for Unit Download PDFInfo
- Publication number
- US20120255720A1 US20120255720A1 US13/530,108 US201213530108A US2012255720A1 US 20120255720 A1 US20120255720 A1 US 20120255720A1 US 201213530108 A US201213530108 A US 201213530108A US 2012255720 A1 US2012255720 A1 US 2012255720A1
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- United States
- Prior art keywords
- temperature
- air
- room air
- supply duct
- damper
- 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.)
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- 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
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
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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
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
- F24F2011/0002—Control or safety arrangements for ventilation for admittance of outside air
- F24F2011/0004—Control or safety arrangements for ventilation for admittance of outside air to create overpressure in a room
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Definitions
- the present invention is a temperature controller for a positive pressure air purification unit and, more specifically, a temperature controller using two temperature sensors for a positive pressure air purification unit.
- the prior art for room air purification in a residential home uses a single air temperature controller and a single temperature sensor.
- the invention is a temperature controller that uses two sensors for controlling temperature in a room.
- the temperature controller is disposed in a positive pressure room air purification unit that is connected to a supply duct of a duct system of a standard residential HVAC duct system.
- the first temperature sensor senses ambient room air temperature.
- the second temperature sensor senses the air temperature of the air from a supply duct of a standard residential HVAC duct system. Based on the desired room air temperature, and the supply duct air temperature, the temperature controller determines whether to draw supply duct air, or both room air and supply duct air and further determines the fan speed setting of the purification unit, and whether to heat the air.
- FIG. 1 is a flow chart that illustrates the operation of the temperature controller of the present invention.
- FIG. 2 is an elevated view of the present invention incorporating the temperature controller.
- FIG. 3 illustrates a side section view taken along line 3 - 3 of FIG. 2 .
- FIG. 1 the operation of the temperature controller 10 of the present invention is provided.
- the normal operating environment for the temperature controller 10 is a positive pressure room air purification unit as shown generally at 12 in FIGS. 2 and 3 .
- the room air purification unit 12 is connected to a supply duct 110 of a standard residential HVAC system.
- the temperature controller 10 determines whether it is functioning normally 14 , whether the fan 49 is functioning normally 49 A, whether the mom air temperature sensor 22 is functioning normally 22 A (and then collects room air temperature information 20 via a temperature sensor 22 (See FIG. 3 ) located on the exterior of the room air purification unit 12 ) and whether the supply duct air temperature sensor 40 is functioning normally 40 A.
- the temperature controller 10 is provided with a user interface for setting a desired room air temperature. Then, the temperature controller 10 determines whether the room air temperature is higher 30 or lower 32 than a calculated temperature which is based on a desired temperature and a dead band range. In addition, the temperature controller 10 determines whether the supply duct air temperature is higher 41 or lower 42 than the room air temperature.
- the cooling mode shown by the dotted lines in FIG. 1 applies.
- the fan output speed is initiated ( 54 or 58 ) and the damper 102 is open 50 thereby closing the room air inlet.
- the damper 102 is set in the partially closed position 52 , and fan output speed is set 60 .
- the heating mode shown the dotted line column in FIG. 1 applies.
- the supply duct air temperature via sensor 40 is higher than the ambient room air temperature via sensor 22 , then according to FIG. 1 , at diamond 41 , damper 102 is open 50 , and fan output speed is set 56 or 58 . If the supply duct air temperature via sensor 40 is lower than the ambient room air temperature 22 , 41 , then damper 102 is placed in the partially closed position 52 , and fan output speed is set 60 .
- the temperature controller determines as shown in FIG. 1 whether the room air damper disposed with, which is infinitely movable between an open 50 and a nearly closed 52 position, will be partially closed 52 , or open 50 , and whether to adjust the user-input minimum fan speed 60 .
- the fan draws air from the through the supply duct and possibly through the room air damper through the positive pressure room air purification unit.
- the temperature controller operates to move the room air damper 50 , 52 and operates to adjust the user-input fan speed 60 , or user-input maximum fan speed 58 , or the automatic fan speed 54 , 56 , 58 (which may override the user-input minimum fan speed 60 ), so that the desired room air temperature may be achieved.
- fan speed settings 54 , 56 and 58 are applied only when the supply duct inlet 112 is open via an open position 50 of room air damper 102 .
- Negatively-weighted ambient temperature 32 is any ambient temperature that is less than or equal to a user-set desired temperature from which half of a deadband range temperature has been subtracted.
- Positively-weighted ambient temperature 30 is any ambient temperature that is greater than or equal to a user-set desired temperature to which half of a deadband range temperature has been added. Because the deadband range has a default setting of four degrees the default negatively-weighted ambient temperature 32 is any ambient temperature that is two degrees or less than a user-set desired temperature.
- the default positively-weighted ambient temperature 30 is any ambient temperature that is two degrees or more than a user-set desired temperature. While the default deadband range is four degrees, this range may be re-set to a larger or smaller range by the user through user input.
- negatively-weighted ambient temperature 32 and positively-weighted ambient temperature 30 allows the user to potentially favor more constant fan speed over temperature fluctuation, rather than constant temperature over fan speed.
- the auxiliary heater will be turned on 44 by temperature controller 10 .
- the temperature controller 10 will open 50 room air damper 102 and the fan speed will be set automatically 54 , 56 , if the unit is in “automatic mode,” ( 48 ) or the fan speed will be set according to command block 58 if the unit is not in “automatic mode.” In other words, temperature controller 10 will ignore any user-input fan speed setting when said temperature controller system 10 is in automatic mode 48 . With respect to fan speed settings 54 , 56 , it is important to point out that the fan speed settings are based on weighted set points.
- the high fan speed setting will be engaged only when the ambient temperature is greater than a high-weighted set point equal to 3 degrees over the user-set desired temperature; the medium fan speed setting will be engaged only when the ambient temperature is greater than a medium-weighted set point equal to 2 degrees over the user-set desired temperature; the low fan speed setting will be engaged only when the ambient temperature is greater than a low-weighted set point equal to 1 degree over the user-set desired temperature.
- the high fan speed setting will be engaged only when the ambient temperature is less than a low weighted set point equal to 3 degrees under the user-set desired temperature; the medium fan speed setting will be engaged only when the ambient temperature is less than a medium-weighted set-point equal to 2 degrees under the user-set desired temperature; the low fan speed setting will be engaged only when the ambient temperature is less than a low-weighted set-point equal to 1 degree under the user-set desired temperature.
- the 3 degree, 2 degree and 1 degree set point weightings are default settings and these amount of weighting may be changed by user input.
- the fan output may be manually set 60 , but the damper 102 will remain in the default open 50 position.
- an HVAC floor supply duct 110 is in communication with a bottom chamber of temperature controller system unit 10 .
- the temperature of the air from HVAC floor supply duct 110 entering supply duct inlet 112 is taken by sensor 40 .
- supply duct 110 may physically enter supply duct inlet 112 not from the floor, but from the wall or ceiling, depending on the physical location of the supply duct within the room.
- a plate 114 having a width 114 W which may be removed to provide a perpendicular, second direction of entry from which a volume of air may be admitted through supply duct inlet 112 . If plate 114 is removed and used for introducing air into supply duct inlet 112 , then plate 114 may be re-used by connecting it into the bottom of positive pressure air purification unit 12 thereby covering and preventing HVAC supply duct 110 from supplying air from the floor HVAC duct 110 .
- a different plate (not shown) other than plate 114 and having different dimensions from plate 114 may be used to prevent HVAC supply duct 110 from supplying air from the floor.
- the positive pressure air purification unit 12 may be also mounted to a ceiling to provide inlet 112 access to a ceiling supply duct (not shown), it is important to note that regardless of the plate 114 itself, positive pressure air purification unit is adapted to provide a single inlet 112 for one of two perpendicular air flow paths (floor or wall).
- a room air inlet is shown at 108 .
- the temperature of the room air (ambient air) is sensed by room air temperature sensor 22 .
- Damper 102 is controlled by damper motor 106 and spring 104 . It should be appreciated that spring 104 may be either internal to damper motor 106 (not shown) or external to damper motor 106 as shown in FIG. 3 .
- damper 102 In either configuration, upon a loss of power to damper motor 106 , spring 104 biases damper 102 to an open position 50 .
- This open position 50 prevents any accumulated foreign materials from falling from the face of the filter into the room.
- the display shows an error 50 A (See FIG. 1 ), and any error 50 A results in the damper's 102 moving to open position 50 .
- damper motor 106 moves damper 102 from the open position 50 to an infinite number of positions between open position 50 and (nearly completely closed position) or partially closed position 52 .
- Nearly completely closed (or partially closed position) 52 does not allow damper 102 to completely prevent air from HVAC floor supply duct 110 , but always allows some air from the HVAC floor supply duct 110 to be drawn to generate positive pressure within the room.
- Damper motor 106 may be a standard type AC motor, or may be a stepper motor. With any type of damper motor 106 , the motor will be adapted to stop at position 52 such that damper 102 does not completely prevent air from HVAC supply duct 110 from entering the unit 12 via supply duct inlet 112 .
- position 52 has a mechanically-enforced limit separate and independent from the spring 104 bias that may be already incorporated into damper motor 106 . Because the mechanically enforced limits 104 , 116 are each independently sufficient to position damper 102 in a nearly closed position 52 , it should be understood that the present invention will function perfectly with only one of these mechanically-enforced limits. As stated above with respect to the description of FIG. 1 , based on how the user selects room size, the damper motor 106 varies the size of the opening of (and thus the mass flow rate of air from) the supply duct air.
- Air passes over heating elements 44 A, which may be “on” or “off” depending on the decision by the system controller 10 in FIG. 1 .
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Abstract
A temperature controller for a positive pressure room air purification unit is provided with a sensor for ambient room air temperature and supply duct air temperature. Based on the desired temperature, supply duct air may be drawn or drawn and heated.
Description
- This application is a continuation-in-part of pending U.S. patent application Ser. No. 12/229,169 filed on Aug. 20, 2008.
- 1. Field of the Invention
- The present invention is a temperature controller for a positive pressure air purification unit and, more specifically, a temperature controller using two temperature sensors for a positive pressure air purification unit.
- 2. Related Art
- The prior art for room air purification in a residential home uses a single air temperature controller and a single temperature sensor.
- The invention is a temperature controller that uses two sensors for controlling temperature in a room. The temperature controller is disposed in a positive pressure room air purification unit that is connected to a supply duct of a duct system of a standard residential HVAC duct system. The first temperature sensor senses ambient room air temperature. The second temperature sensor senses the air temperature of the air from a supply duct of a standard residential HVAC duct system. Based on the desired room air temperature, and the supply duct air temperature, the temperature controller determines whether to draw supply duct air, or both room air and supply duct air and further determines the fan speed setting of the purification unit, and whether to heat the air.
- Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
- The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
-
FIG. 1 is a flow chart that illustrates the operation of the temperature controller of the present invention. -
FIG. 2 is an elevated view of the present invention incorporating the temperature controller. -
FIG. 3 . illustrates a side section view taken along line 3-3 ofFIG. 2 . - The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
- In
FIG. 1 , the operation of thetemperature controller 10 of the present invention is provided. The normal operating environment for thetemperature controller 10 is a positive pressure room air purification unit as shown generally at 12 inFIGS. 2 and 3 . The roomair purification unit 12 is connected to asupply duct 110 of a standard residential HVAC system. Initially, thetemperature controller 10 determines whether it is functioning normally 14, whether thefan 49 is functioning normally 49A, whether the momair temperature sensor 22 is functioning normally 22A (and then collects roomair temperature information 20 via a temperature sensor 22 (SeeFIG. 3 ) located on the exterior of the room air purification unit 12) and whether the supply ductair temperature sensor 40 is functioning normally 40A. - The
temperature controller 10 is provided with a user interface for setting a desired room air temperature. Then, thetemperature controller 10 determines whether the room air temperature is higher 30 or lower 32 than a calculated temperature which is based on a desired temperature and a dead band range. In addition, thetemperature controller 10 determines whether the supply duct air temperature is higher 41 or lower 42 than the room air temperature. - If the room air temperature is higher than desired, then the cooling mode shown by the dotted lines in
FIG. 1 applies. In this case, if the supply duct air temperature viasensor 40 is cooler than theambient air temperature damper 102 is open 50 thereby closing the room air inlet. If the supply duct air temperature is higher than the ambient room air temperature, then thedamper 102 is set in the partially closedposition 52, and fan output speed is set 60. - If the room air temperature is lower than desired, then the heating mode shown the dotted line column in
FIG. 1 applies. In this case, if the supply duct air temperature viasensor 40, is higher than the ambient room air temperature viasensor 22, then according toFIG. 1 , atdiamond 41,damper 102 is open 50, and fan output speed is set 56 or 58. If the supply duct air temperature viasensor 40 is lower than the ambientroom air temperature damper 102 is placed in the partially closedposition 52, and fan output speed is set 60. - Based upon the desired temperature, a temperature range, and the room air temperature and the supply duct temperature, the temperature controller determines as shown in
FIG. 1 whether the room air damper disposed with, which is infinitely movable between an open 50 and a nearly closed 52 position, will be partially closed 52, or open 50, and whether to adjust the user-inputminimum fan speed 60. The fan draws air from the through the supply duct and possibly through the room air damper through the positive pressure room air purification unit. After making the determination, the temperature controller operates to move theroom air damper input fan speed 60, or user-inputmaximum fan speed 58, or theautomatic fan speed - It should be appreciated that
fan speed settings FIG. 1 ) are applied only when thesupply duct inlet 112 is open via anopen position 50 ofroom air damper 102. - As seen in
FIG. 1 , there is a negatively-weighted ambient temperature at 32 and a positively-weighted ambient temperature at 30. Negatively-weightedambient temperature 32 is any ambient temperature that is less than or equal to a user-set desired temperature from which half of a deadband range temperature has been subtracted. Positively-weightedambient temperature 30 is any ambient temperature that is greater than or equal to a user-set desired temperature to which half of a deadband range temperature has been added. Because the deadband range has a default setting of four degrees the default negatively-weightedambient temperature 32 is any ambient temperature that is two degrees or less than a user-set desired temperature. Similarly, the default positively-weightedambient temperature 30 is any ambient temperature that is two degrees or more than a user-set desired temperature. While the default deadband range is four degrees, this range may be re-set to a larger or smaller range by the user through user input. - The use of negatively-weighted
ambient temperature 32 and positively-weightedambient temperature 30 allows the user to potentially favor more constant fan speed over temperature fluctuation, rather than constant temperature over fan speed. - If the desired temperature is higher than the ambient room air temperature and supply duct air temperature, the auxiliary heater will be turned on 44 by
temperature controller 10. - If the desired temperature is lower than the ambient room air temperature, and the supply duct air temperature is lower than ambient room air temperature, the
temperature controller 10 will open 50room air damper 102 and the fan speed will be set automatically 54, 56, if the unit is in “automatic mode,” (48) or the fan speed will be set according tocommand block 58 if the unit is not in “automatic mode.” In other words,temperature controller 10 will ignore any user-input fan speed setting when saidtemperature controller system 10 is inautomatic mode 48. With respect tofan speed settings fan speed settings 56, the high fan speed setting will be engaged only when the ambient temperature is greater than a high-weighted set point equal to 3 degrees over the user-set desired temperature; the medium fan speed setting will be engaged only when the ambient temperature is greater than a medium-weighted set point equal to 2 degrees over the user-set desired temperature; the low fan speed setting will be engaged only when the ambient temperature is greater than a low-weighted set point equal to 1 degree over the user-set desired temperature. Specifically, with respect tofan speed settings 54, the high fan speed setting will be engaged only when the ambient temperature is less than a low weighted set point equal to 3 degrees under the user-set desired temperature; the medium fan speed setting will be engaged only when the ambient temperature is less than a medium-weighted set-point equal to 2 degrees under the user-set desired temperature; the low fan speed setting will be engaged only when the ambient temperature is less than a low-weighted set-point equal to 1 degree under the user-set desired temperature. The 3 degree, 2 degree and 1 degree set point weightings are default settings and these amount of weighting may be changed by user input. - In order to maintain positive pressure within the room, it will be appreciated that supply duct air at all times will be drawn by the positive pressure room air purification unit into the same room in which the positive pressure
air purification unit 12 is located. This is because the partially closedposition 52 ofdamper 102 always allows some volume of air to pass fromsupply duct 110 throughsupply duct inlet 112 and throughoutlet 46. Ideally, the positive pressure room air purification unit will be equipped with a filtration system that will allow only purified air to pass through and exhaust into the room. - It should be appreciated that in case of
component malfunction damper 102 will remain in the default open 50 position. - As shown in
FIGS. 2 and 3 , an HVACfloor supply duct 110 is in communication with a bottom chamber of temperaturecontroller system unit 10. The temperature of the air from HVACfloor supply duct 110 enteringsupply duct inlet 112 is taken bysensor 40. - In an alternative embodiment,
supply duct 110 may physically entersupply duct inlet 112 not from the floor, but from the wall or ceiling, depending on the physical location of the supply duct within the room. In this case, as seen inFIG. 3 , there is aplate 114 having awidth 114W which may be removed to provide a perpendicular, second direction of entry from which a volume of air may be admitted throughsupply duct inlet 112. Ifplate 114 is removed and used for introducing air intosupply duct inlet 112, then plate 114 may be re-used by connecting it into the bottom of positive pressureair purification unit 12 thereby covering and preventingHVAC supply duct 110 from supplying air from thefloor HVAC duct 110. Alternatively, a different plate (not shown) other thanplate 114 and having different dimensions fromplate 114 may be used to preventHVAC supply duct 110 from supplying air from the floor. Because the positive pressureair purification unit 12 may be also mounted to a ceiling to provideinlet 112 access to a ceiling supply duct (not shown), it is important to note that regardless of theplate 114 itself, positive pressure air purification unit is adapted to provide asingle inlet 112 for one of two perpendicular air flow paths (floor or wall). - A room air inlet is shown at 108. The temperature of the room air (ambient air) is sensed by room
air temperature sensor 22. -
Damper 102 is controlled bydamper motor 106 andspring 104. It should be appreciated thatspring 104 may be either internal to damper motor 106 (not shown) or external todamper motor 106 as shown inFIG. 3 . - In either configuration, upon a loss of power to
damper motor 106,spring 104biases damper 102 to anopen position 50. Thisopen position 50 prevents any accumulated foreign materials from falling from the face of the filter into the room. Similarly, in the event of malfunction, the display shows anerror 50A (SeeFIG. 1 ), and anyerror 50A results in the damper's 102 moving to openposition 50. - When powered,
damper motor 106 movesdamper 102 from theopen position 50 to an infinite number of positions betweenopen position 50 and (nearly completely closed position) or partiallyclosed position 52. Nearly completely closed (or partially closed position) 52 does not allowdamper 102 to completely prevent air from HVACfloor supply duct 110, but always allows some air from the HVACfloor supply duct 110 to be drawn to generate positive pressure within the room.Damper motor 106 may be a standard type AC motor, or may be a stepper motor. With any type ofdamper motor 106, the motor will be adapted to stop atposition 52 such thatdamper 102 does not completely prevent air fromHVAC supply duct 110 from entering theunit 12 viasupply duct inlet 112. In addition, preferred embodiment shows the twobar linkage 116 betweendamper 102 anddamper motor 106 physically preventsdamper 106 from completely closing air flow fromHVAC supply duct 110. Therefore,position 52 has a mechanically-enforced limit separate and independent from thespring 104 bias that may be already incorporated intodamper motor 106. Because the mechanically enforcedlimits damper 102 in a nearlyclosed position 52, it should be understood that the present invention will function perfectly with only one of these mechanically-enforced limits. As stated above with respect to the description ofFIG. 1 , based on how the user selects room size, thedamper motor 106 varies the size of the opening of (and thus the mass flow rate of air from) the supply duct air. - Air passes over
heating elements 44A, which may be “on” or “off” depending on the decision by thesystem controller 10 inFIG. 1 . - It is very important to understand that the combined mass flow rate of air entering through
supply duct 110 androom air inlet 108 is equal to the mass flow rate of air passingheating elements 44A and exitingunit 12 viaoutlet 46. Thus, positive pressure is generated by the present invention in the same room in which the entire invention is located, but due to equal mass flow rates in and out, there is no net positive pressure within the unit of the present invention itself. - As various modifications could be made to the exemplary embodiments, as described above with reference to the corresponding illustrations, without departing from the scope of the invention, it is intended that all matter contained in the foregoing description and shown in the accompanying drawings shall be interpreted as illustrative rather than limiting. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims appended hereto and their equivalents.
Claims (9)
1. A temperature controller system for a positive pressure air purification unit comprising:
a positive pressure air purification unit disposed within a room, having a first inlet in fluid communication with an HVAC supply duct, a second inlet in fluid communication with ambient air within a room, a filter for filtering air, an outlet, and a fan having a plurality of speed settings disposed between said filter and said outlet for drawing air from at least said first inlet;
a first temperature sensor disposed on an exterior surface of said positive pressure air purification unit adapted to sense ambient room air temperature;
a second temperature sensor disposed within said positive pressure air purification unit adapted to sense supply duct air temperature of an HVAC duct system;
a room air damper infinitely movable between an open and a partially closed position to allow air from the supply duct to be drawn and positionally controlled by said temperature controller system, said room air damper being incapable of fully closing the supply duct;
a user input interface for inputting a desired temperature; and
wherein said room air damper is moved by said temperature controller between said open position and said partially closed position, such that some volume of air is always drawn from said HVAC supply duct by said positive pressure air purification unit to create a positive pressure in the room in which said positive pressure air purification unit is disposed.
2. The temperature controller system according to claim 1 ,
wherein when said room air damper is in an open position, air is drawn only from said first air inlet and no air is drawn from said second air inlet, and
wherein when said room air damper is in a partially closed position air is drawn from said second air inlet and a much smaller volume of air is drawn from said first air inlet, such that a volume of air is always drawn from said first air inlet, said room air damper being capable of assuming any position between said open position and said partially closed position.
3. The temperature controller system according to claim 2 ,
wherein said room air damper will be moved to an open position when said supply duct air temperature is less than ambient room air temperature and said input desired temperature is less than ambient room air temperature; and
wherein said room air damper will be moved to an open position when said supply duct air temperature is greater than said ambient room air temperature and said input desired temperature is greater than ambient room air temperature.
4. The temperature controller system according to claim 2 , wherein said room air damper will be moved to an open position when said supply duct air temperature is less than ambient room air temperature and said input desired temperature is less than or equal to a positively-weighted ambient room air temperature; and wherein said room air damper will be moved to a partially closed position when a negatively-weighted ambient temperature is less than or equal to the input desired temperature and said supply duct air temperature is less than said ambient room air temperature.
5. The temperature controller system according to claim 2 , wherein said room air damper will be moved to an open position when said supply duct air temperature is greater than ambient room air temperature and said input desired temperature is greater than or equal to a negatively-weighted ambient room air temperature; and wherein said room air damper will be moved to a partially closed position when a positively-weighted ambient temperature is greater than or equal to the input desired temperature said supply duct air temperature is greater than said ambient room air temperature.
6. The temperature controller system according to claim 1 , wherein said user input interface further comprises an input for setting a desired fan speed.
7. The temperature controller system according to claim 6 , wherein said temperature controller system ignores said user-input set fan speed when said controller system is in automatic mode.
8. The temperature controller system according to claim 1 , wherein said room air damper is biased to assume an open position upon the occurrence of one of the following events selected from the following group: loss of power, malfunction of said first temperature sensor, malfunction of said second temperature sensor, malfunction of said controller system, and malfunction of said fan.
9. The temperature controller system according to claim 1 , wherein said positive pressure air purification unit further comprises:
a plate attached to one of two perpendicular air flow paths, blocking fluid communication between a supply duct and said positive pressure air purification unit;
wherein said first inlet allows fluid communication between one of two perpendicular air flow paths and said damper.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/530,108 US20120255720A1 (en) | 2008-08-20 | 2012-06-22 | Temperature Controller for Unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US12/229,169 US20100044447A1 (en) | 2008-08-20 | 2008-08-20 | Temperature control for positive pressure air purification unit |
US13/530,108 US20120255720A1 (en) | 2008-08-20 | 2012-06-22 | Temperature Controller for Unit |
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Application Number | Title | Priority Date | Filing Date |
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US12/229,169 Continuation-In-Part US20100044447A1 (en) | 2008-08-20 | 2008-08-20 | Temperature control for positive pressure air purification unit |
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US13/530,108 Abandoned US20120255720A1 (en) | 2008-08-20 | 2012-06-22 | Temperature Controller for Unit |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US20130116832A1 (en) * | 2011-11-09 | 2013-05-09 | Honeywell International Inc. | Actuator having an adjustable running time |
US20150028117A1 (en) * | 2013-07-26 | 2015-01-29 | Julian Jameson | Air heater systems and control methods |
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US10113762B2 (en) * | 2011-11-09 | 2018-10-30 | Honeywell International Inc. | Actuator having an adjustable running time |
US20130116832A1 (en) * | 2011-11-09 | 2013-05-09 | Honeywell International Inc. | Actuator having an adjustable running time |
US20150028117A1 (en) * | 2013-07-26 | 2015-01-29 | Julian Jameson | Air heater systems and control methods |
US11506215B1 (en) * | 2014-10-14 | 2022-11-22 | Delta T, Llc | Fan with automatic thermal comfort control |
KR20180106765A (en) * | 2017-03-21 | 2018-10-01 | 엘지전자 주식회사 | Refrigerator |
CN108626933A (en) * | 2017-03-21 | 2018-10-09 | Lg电子株式会社 | Refrigerator |
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US10731900B2 (en) * | 2017-03-21 | 2020-08-04 | Lg Electronics Inc. | Refrigerator |
US10859294B2 (en) | 2017-03-21 | 2020-12-08 | Lg Electronics Inc. | Refrigerator with thermoelectric module |
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US11629878B2 (en) * | 2018-02-06 | 2023-04-18 | Scientific Environmental Design, Inc. | HVAC system for enhanced source-to-load matching in low load structures |
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