US20180156490A1 - Dynamic sizing of damper sections and/or air economizer compartments - Google Patents
Dynamic sizing of damper sections and/or air economizer compartments Download PDFInfo
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- US20180156490A1 US20180156490A1 US15/833,632 US201715833632A US2018156490A1 US 20180156490 A1 US20180156490 A1 US 20180156490A1 US 201715833632 A US201715833632 A US 201715833632A US 2018156490 A1 US2018156490 A1 US 2018156490A1
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- United States
- Prior art keywords
- air
- partition
- indoor
- outdoor
- damper
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- 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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- 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
- F24F13/02—Ducting arrangements
- F24F13/04—Air-mixing units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
-
- 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
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
-
- 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
-
- 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
- F24F2110/12—Temperature of the outside air
-
- 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
- F24F2110/20—Humidity
-
- 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
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
-
- 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
- F24F2110/50—Air quality properties
-
- 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
- F24F2110/50—Air quality properties
- F24F2110/52—Air quality properties of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- HVAC heating, ventilation, and air conditioning
- HVAC systems may circulate a fluid, such as a refrigerant, through a closed loop between an evaporator coil where the fluid absorbs heat and a condenser where the fluid releases heat.
- a fluid such as a refrigerant
- the fluid flowing within the closed loop is generally formulated to undergo phase changes within the normal operating temperatures and pressures of the system so that quantities of heat can be exchanged by virtue of the latent heat of vaporization of the fluid.
- a fan may blow air over, or pull air across, the coils of the heat exchanger(s) in order to condition the air.
- the volume of air passing over the coils of the heat exchanger may include a portion of air returned from a conditioned space of the residence or building, referred to as “return air” or “indoor air”, and a portion of external or ambient air, referred to as “outdoor air,” which may be used to ventilate the indoor air.
- a traditional air economizer of a traditional HVAC system may receive the indoor air and outdoor air, combine the flows thereof, and pass the combined flow over a heat exchange coil.
- Traditional air economizers may include inefficiencies related to undesired pressure drops within the traditional air economizer. Accordingly, improved air economizers for HVAC systems are desired.
- the present disclosure relates to an air economizer of a heating, ventilation, and air conditioning (HVAC) system.
- the air economizer includes an outdoor air compartment configured to receive outdoor air and an indoor air compartment configured to receive indoor air.
- the air economizer also includes a partition extending between the outdoor air compartment and the indoor air compartment. The partition is configured to move between a first position and a second position such that a damper of the air economizer receives the indoor air when the partition is in the first position, and such that the damper receives the outdoor air when the partition is in the second position.
- a method of controlling an air economizer of a heating, ventilation, and air conditioning (HVAC) system includes determining, via a controller, a desired ratio between a first amount of indoor air received by an indoor air compartment of the air economizer and a second amount of outdoor air received by an outdoor air compartment of the air economizer. The method also includes instructing, via the controller and based on the desired ratio, damper settings of dampers of the air economizer.
- HVAC heating, ventilation, and air conditioning
- the method also includes adjusting, via the controller, a position of a partition of the air economizer extending between the indoor air compartment and the outdoor air compartment to assign a first group of the dampers to the indoor air compartment and to assign a second group of the dampers to the outdoor air compartment, such that an additional ratio between a first damper space of the first group of dampers and a second damper space of the second group of dampers is aligned with the desired ratio.
- the present disclosure also relates to a heating, ventilation, and air conditioning (HVAC) system having an air economizer.
- HVAC heating, ventilation, and air conditioning
- the air economizer includes an air intake having an outdoor intake section and an indoor intake section.
- the air economizer also includes a partition separating the outdoor intake section from the indoor intake section, where the partition is rotatable to adjust sizes of the outdoor intake section and the indoor intake section based on desired amounts of outdoor air received by the outdoor intake section and indoor air received by the indoor intake section over an operating period of time.
- FIG. 1 is an illustration of an embodiment of a commercial or industrial HVAC system, in accordance with the present techniques
- FIG. 2 is an illustration of an embodiment of a portion of a packaged unit of the HVAC system shown in FIG. 1 , in accordance with the present techniques;
- FIG. 3 is an illustration of an embodiment of a split system of the HVAC system shown in FIG. 1 , in accordance with the present techniques;
- FIG. 4 is a schematic diagram of an embodiment of a refrigeration system of the HVAC system shown in FIG. 1 , in accordance with the present techniques;
- FIG. 5 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems of FIGS. 1-4 and having a movable partition in a first position, in accordance with the present techniques;
- FIG. 6 is a cross-sectional overhead view of a schematic diagram of the air economizer of FIG. 5 having the movable partition in a second position different than the first position of FIG. 5 , in accordance with the present techniques;
- FIG. 7 is a cross-sectional overhead view of a schematic diagram of the air economizer of FIG. 5 having the movable partition in a third position different than the first position of FIG. 5 and the second position of FIG. 6 , in accordance with the present techniques;
- FIG. 8 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems of FIGS. 1-4 , in accordance with the present techniques;
- FIG. 9 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems of FIGS. 1-4 , in accordance with the present techniques;
- FIG. 10 is a close-up view of an embodiment of a coupling mechanism between the partition of the air economizer of FIG. 5 and a contact point between dampers of the air economizer, in accordance with the present techniques;
- FIG. 11 is a close-up view of an embodiment of a coupling mechanism between the partition of the air economizer of FIG. 5 and a contact point between dampers of the air economizer, in accordance with the present techniques;
- FIG. 12 is a flow chart illustrating an embodiment of a method of operating an air economizer to dynamically size compartments therein, in accordance with the present techniques.
- FIG. 13 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems of FIGS. 1-4 , in accordance with the present techniques.
- HVAC system heating, ventilation, and air conditioning system
- a HVAC system may include an air economizer having an indoor or return air intake section or compartment configured to receive indoor air from a space conditioned by the HVAC system, and an outdoor air intake section configured to receive outdoor air from ambient.
- the outdoor air may be combined with the indoor air to generate a ventilated and/or cooled combined volume of air.
- the combined volume of air may pass over a coil of a heat exchanger, such as an evaporator coil, and a refrigerant or other fluid passing through the evaporator coil may absorb heat from the combined volume of air, thereby further coiling the combined volume of air.
- the air economizer may be configured such that the indoor air intake section and the outdoor air intake section are positioned adjacent to one another.
- a bank of dampers may be positioned downstream of the adjacent indoor air intake section and the outdoor air intake section, such that the bank of dampers is configured to receive the combined volume of air described above.
- the bank of dampers may extend across a damper opening or space.
- the dampers of the bank may be adjusted or positioned to facilitate an amount of indoor air through the indoor air intake section over a discrete operating period of time, such as a volumetric flow rate of indoor air, and to similarly determine a volumetric flow rate of outdoor air through the outdoor air intake section.
- the positions of the dampers and corresponding volumetric flow rates of indoor and outdoor air therethrough may be determined based on certain operating conditions, ambient conditions, and/or desired conditions of the space being conditioned.
- a controller may receive sensor feedback indicative of these conditions, and the controller may instruct positions of the dampers accordingly. For example, if the outdoor air is warmer than the space being conditioned by the HVAC system and cooling is desired, the dampers receiving the outdoor air may be positioned by the controller to reduce the volumetric flow rate of the outdoor air through the outdoor air intake section, such that the outdoor air is just enough to ventilate the indoor air but not substantially heat the indoor air.
- the dampers receiving the outdoor air may be positioned by the controller to increase the volumetric flow rate of the outdoor air through the outdoor air intake section to both ventilate and cool the indoor air.
- a partition may extend between a portion of the indoor air intake section and a portion of the outdoor air intake section.
- a wall may separate the indoor air intake section from the outdoor air intake section.
- a gap may be positioned between an end of the wall and the bank of dampers.
- the partition may extend within the gap from the end of the wall to the bank of dampers.
- the partition may be movable, based on instruction from the controller, toward the indoor air intake section and away from the outdoor air intake section in order to contract a volume of the indoor air intake section, and in order to expand a volume of the outdoor air intake section.
- the partition may be movable, based on instruction from the controller, toward the outdoor air intake section and away from the indoor air intake section in order to contract the volume of the outdoor air intake section, and in order to expand the volume of the indoor air intake section.
- a position of the partition may be determined based on the position of the dampers, which, as described above, may be determined based on operating conditions and/or ambient or environmental conditions.
- a controller that instructs the damper positions and the movement of the partition may also assign which dampers correspond with the indoor air intake section and which dampers correspond with the outdoor air intake section, as assignment of the dampers to the appropriate air intake section is dependent on the position of the partition.
- FIG. 1 illustrates a heating, ventilating, and air conditioning (HVAC) system for building environmental management that may employ one or more HVAC units.
- HVAC heating, ventilating, and air conditioning
- a building 10 is air conditioned by a system that includes an HVAC unit 12 .
- the building 10 may be a commercial structure or a residential structure.
- the HVAC unit 12 is disposed on the roof of the building 10 ; however, the HVAC unit 12 may be located in other equipment rooms or areas adjacent the building 10 .
- the HVAC unit 12 may be a single package unit containing other equipment, such as a blower, integrated air handler, and/or auxiliary heating unit.
- the HVAC unit 12 may be part of a split HVAC system, such as the system shown in FIG. 3 , which includes an outdoor HVAC unit 58 and an indoor HVAC unit 56 .
- the HVAC unit 12 is an air cooled device that implements a refrigeration cycle to provide conditioned air to the building 10 .
- the HVAC unit 12 may include one or more heat exchangers across which an air flow is passed to condition the air flow before the air flow is supplied to the building.
- the HVAC unit 12 is a rooftop unit (RTU) that conditions a supply air stream, such as environmental air and/or a return air flow from the building 10 .
- RTU rooftop unit
- the HVAC unit 12 conditions the air, the air is supplied to the building 10 via ductwork 14 extending throughout the building 10 from the HVAC unit 12 .
- the ductwork 14 may extend to various individual floors or other sections of the building 10 .
- the HVAC unit 12 may be a heat pump that provides both heating and cooling to the building with one refrigeration circuit configured to operate in different modes.
- the HVAC unit 12 may include one or more refrigeration circuits for cooling an air stream and a furnace for heating the air stream.
- a control device 16 may be used to designate the temperature of the conditioned air.
- the control device 16 also may be used to control the flow of air through the ductwork 14 .
- the control device 16 may be used to regulate operation of one or more components of the HVAC unit 12 or other components, such as dampers and fans, within the building 10 that may control flow of air through and/or from the ductwork 14 .
- other devices may be included in the system, such as pressure and/or temperature transducers or switches that sense the temperatures and pressures of the supply air, return air, and so forth.
- the control device 16 may include computer systems that are integrated with or separate from other building control or monitoring systems, and even systems that are remote from the building 10 .
- FIG. 2 is a perspective view of an embodiment of a portion of the HVAC unit 12 .
- the portion of the HVAC unit 12 illustrated in FIG. 2 has certain features, such as panels and an air economizer, removed for clarity.
- the HVAC unit 12 is a single package unit that may include one or more independent refrigeration circuits and components that are tested, charged, wired, piped, and ready for installation.
- the HVAC unit 12 may provide a variety of heating and/or cooling functions, such as cooling only, heating only, cooling with electric heat, cooling with dehumidification, cooling with gas heat, or cooling with a heat pump. As described above, the HVAC unit 12 may directly cool and/or heat an air stream provided to the building 10 to condition a space in the building 10 .
- a cabinet 24 encloses the HVAC unit 12 and provides structural support and protection to the internal components from environmental and other contaminants.
- the cabinet 24 may be constructed of galvanized steel and insulated with aluminum foil faced insulation.
- Rails 26 may be joined to the bottom perimeter of the cabinet 24 and provide a foundation for the HVAC unit 12 .
- the rails 26 may provide access for a forklift and/or overhead rigging to facilitate installation and/or removal of the HVAC unit 12 .
- the rails 26 may fit into “curbs” on the roof to enable the HVAC unit 12 to provide air to the ductwork 14 from the bottom of the HVAC unit 12 while blocking elements such as rain from leaking into the building 10 .
- the HVAC unit 12 includes heat exchangers 28 and 30 in fluid communication with one or more refrigeration circuits. Tubes within the heat exchangers 28 and 30 may circulate refrigerant, such as R- 410 A, through the heat exchangers 28 and 30 .
- the tubes may be of various types, such as multichannel tubes, conventional copper or aluminum tubing, and so forth.
- the heat exchangers 28 and 30 may implement a thermal cycle in which the refrigerant undergoes phase changes and/or temperature changes as it flows through the heat exchangers 28 and 30 to produce heated and/or cooled air.
- the heat exchanger 28 may function as a condenser where heat is released from the refrigerant to ambient air, and the heat exchanger 30 may function as an evaporator where the refrigerant absorbs heat to cool an air stream.
- the HVAC unit 12 may operate in a heat pump mode where the roles of the heat exchangers 28 and 30 may be reversed. That is, the heat exchanger 28 may function as an evaporator and the heat exchanger 30 may function as a condenser.
- the HVAC unit 12 may include a furnace for heating the air stream that is supplied to the building 10 . While the illustrated embodiment of FIG. 2 shows the HVAC unit 12 having two of the heat exchangers 28 and 30 , in other embodiments, the HVAC unit 12 may include one heat exchanger or more than two heat exchangers.
- the heat exchanger 30 is located within a compartment 31 that separates the heat exchanger 30 from the heat exchanger 28 .
- Fans 32 draw air from the environment through the heat exchanger 28 , where the heat exchanger 28 may be framed within the cabinet 24 of the HVAC unit 12 and/or containers 29 below the fans 32 . Air may be heated and/or cooled as the air flows through the heat exchanger 28 before being released back to the environment surrounding the rooftop unit 12 .
- a blower assembly 34 powered by a motor hidden from view behind the blower assembly 34 , draws air through the heat exchanger 30 to heat or cool the air.
- the heated or cooled air may be directed to the building 10 by the ductwork 14 , which may be connected to the HVAC unit 12 .
- the conditioned air flows through one or more filters 38 that may remove particulates and contaminants from the air.
- an air economizer may be disposed in an area 33 of the HVAC unit 12 upstream of the filters 38 .
- the filters 38 may be disposed on the air intake side of the heat exchanger 30 to prevent contaminants from contacting the heat exchanger 30 .
- the HVAC unit 12 also may include other equipment for implementing the thermal cycle.
- Compressors 42 increase the pressure and temperature of the refrigerant before the refrigerant enters the heat exchanger 28 .
- the compressors 42 may be any suitable type of compressors, such as scroll compressors, rotary compressors, screw compressors, or reciprocating compressors.
- the compressors 42 may include a pair of hermetic direct drive compressors arranged in a dual stage configuration 44 .
- the compressors 42 include two dual stage configurations 44 .
- any number of the compressors 42 may be provided to achieve various stages of heating and/or cooling.
- additional equipment and devices may be included in the HVAC unit 12 , such as a solid-core filter drier, a drain pan, a disconnect switch, an economizer, pressure switches, phase monitors, and humidity sensors, among other things.
- the HVAC unit 12 may receive power through a terminal block, which is hidden from view behind the illustrated control board 48 .
- a high voltage power source may be connected to the terminal block to power the equipment.
- the operation of the HVAC unit 12 may be governed or regulated by the control board 48 .
- the control board 48 may include control circuitry connected to a thermostat, sensors, and alarms. One or more of these components may be referred to herein separately or collectively as the control device 16 .
- the control circuitry may be configured to control operation of the equipment, provide alarms, and monitor safety switches. Wiring may connect the control board 48 and the terminal block to the equipment of the HVAC unit 12 .
- FIG. 3 illustrates a residential heating and cooling system 50 , also in accordance with present techniques.
- the residential heating and cooling system 50 may provide heated and cooled air to a residential structure, as well as provide outside air for ventilation and provide improved indoor air quality (IAQ) through devices such as ultraviolet lights and air filters.
- IAQ indoor air quality
- the residential heating and cooling system 50 is a split HVAC system.
- a residence 52 conditioned by a split HVAC system may include refrigerant conduits 54 that operatively couple the indoor unit 56 to the outdoor unit 58 .
- the indoor unit 56 may be positioned in a utility room, an attic, a basement, and so forth.
- the outdoor unit 58 is typically situated adjacent to a side of residence 52 and is covered by a shroud to protect the system components and to prevent leaves and other debris or contaminants from entering the unit.
- the refrigerant conduits 54 transfer refrigerant between the indoor unit 56 and the outdoor unit 58 , typically transferring primarily liquid refrigerant in one direction and primarily vaporized refrigerant in an opposite direction.
- a heat exchanger 60 in the outdoor unit 58 serves as a condenser for re-condensing vaporized refrigerant flowing from the indoor unit 56 to the outdoor unit 58 via one of the refrigerant conduits 54 .
- a heat exchanger 62 of the indoor unit functions as an evaporator. Specifically, the heat exchanger 62 receives liquid refrigerant, which may be expanded by an expansion device, and evaporates the refrigerant before returning it to the outdoor unit 58 .
- the outdoor unit 58 draws environmental air through the heat exchanger 60 using a fan 64 and expels the air above the outdoor unit 58 .
- the air is heated by the heat exchanger 60 within the outdoor unit 58 and exits the unit at a temperature higher than it entered.
- the indoor unit 56 includes a blower or fan 66 that directs air through or across the indoor heat exchanger 62 , where the air is cooled when the system is operating in air conditioning mode. Thereafter, the air is passed through ductwork 68 that directs the air to the residence 52 .
- the overall system operates to maintain a desired temperature as set by a system controller.
- the residential heating and cooling system 50 may become operative to refrigerate additional air for circulation through the residence 52 .
- the residential heating and cooling system 50 may stop the refrigeration cycle temporarily.
- the residential heating and cooling system 50 may also operate as a heat pump.
- the roles of heat exchangers 60 and 62 are reversed. That is, the heat exchanger 60 of the outdoor unit 58 will serve as an evaporator to evaporate refrigerant and thereby cool air entering the outdoor unit 58 as the air passes over outdoor the heat exchanger 60 .
- the indoor heat exchanger 62 will receive a stream of air blown over it and will heat the air by condensing the refrigerant.
- the indoor unit 56 may include a furnace system 70 .
- the indoor unit 56 may include the furnace system 70 when the residential heating and cooling system 50 is not configured to operate as a heat pump.
- the furnace system 70 may include a burner assembly and heat exchanger, among other components, inside the indoor unit 56 .
- Fuel is provided to the burner assembly of the furnace 70 where it is mixed with air and combusted to form combustion products.
- the combustion products may pass through tubes or piping in a heat exchanger, separate from heat exchanger 62 , such that air directed by the blower 66 passes over the tubes or pipes and extracts heat from the combustion products.
- the heated air may then be routed from the furnace system 70 to the ductwork 68 for heating the residence 52 .
- FIG. 4 is an embodiment of a vapor compression system 72 that can be used in any of the systems described above.
- the vapor compression system 72 may circulate a refrigerant through a circuit starting with a compressor 74 .
- the circuit may also include a condenser 76 , an expansion valve(s) or device(s) 78 , and an evaporator 80 .
- the vapor compression system 72 may further include a control panel 82 that has an analog to digital (A/D) converter 84 , a microprocessor 86 , a non-volatile memory 88 , and/or an interface board 90 .
- the control panel 82 and its components may function to regulate operation of the vapor compression system 72 based on feedback from an operator, from sensors of the vapor compression system 72 that detect operating conditions, and so forth.
- the vapor compression system 72 may use one or more of a variable speed drive (VSDs) 92 , a motor 94 , the compressor 74 , the condenser 76 , the expansion valve or device 78 , and/or the evaporator 80 .
- the motor 94 may drive the compressor 74 and may be powered by the variable speed drive (VSD) 92 .
- the VSD 92 receives alternating current (AC) power having a particular fixed line voltage and fixed line frequency from an AC power source, and provides power having a variable voltage and frequency to the motor 94 .
- the motor 94 may be powered directly from an AC or direct current (DC) power source.
- the motor 94 may include any type of electric motor that can be powered by a VSD or directly from an AC or DC power source, such as a switched reluctance motor, an induction motor, an electronically commutated permanent magnet motor, or another suitable motor.
- the compressor 74 compresses a refrigerant vapor and delivers the vapor to the condenser 76 through a discharge passage.
- the compressor 74 may be a centrifugal compressor.
- the refrigerant vapor delivered by the compressor 74 to the condenser 76 may transfer heat to a fluid passing across the condenser 76 , such as ambient or environmental air 96 .
- the refrigerant vapor may condense to a refrigerant liquid in the condenser 76 as a result of thermal heat transfer with the environmental air 96 .
- the liquid refrigerant from the condenser 76 may flow through the expansion device 78 to the evaporator 80 .
- the liquid refrigerant delivered to the evaporator 80 may absorb heat from another air stream, such as a supply air stream 98 provided to the building 10 or the residence 52 .
- the supply air stream 98 may include ambient or environmental air, return air from a building, or a combination of the two.
- the liquid refrigerant in the evaporator 80 may undergo a phase change from the liquid refrigerant to a refrigerant vapor. In this manner, the evaporator 80 may reduce the temperature of the supply air stream 98 via thermal heat transfer with the refrigerant. Thereafter, the vapor refrigerant exits the evaporator 80 and returns to the compressor 74 by a suction line to complete the cycle.
- the vapor compression system 72 may further include a reheat coil in addition to the evaporator 80 .
- the reheat coil may be positioned downstream of the evaporator relative to the supply air stream 98 and may reheat the supply air stream 98 when the supply air stream 98 is overcooled to remove humidity from the supply air stream 98 before the supply air stream 98 is directed to the building 10 or the residence 52 .
- any of the features described herein may be incorporated with the HVAC unit 12 , the residential heating and cooling system 50 , or other HVAC systems. Additionally, while the features disclosed herein are described in the context of embodiments that directly heat and cool a supply air stream provided to a building or other load, embodiments of the present disclosure may be applicable to other HVAC systems as well. For example, the features described herein may be applied to mechanical cooling systems, free cooling systems, chiller systems, or other heat pump or refrigeration applications.
- a system, assembly, or apparatus for dynamically sizing compartments of an economizer of an air intake section of the HVAC unit 12 may be incorporated into any one of the systems illustrated in FIGS. 1-4 and described above.
- the air economizer and corresponding features described below may be disposed in the area 33 illustrated in FIG. 2 .
- a pressure drop and air stratification within the air economizer may be reduced, which improves efficiency of the HVAC unit 12 .
- FIG. 5 illustrates a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer 100 for use in any of the HVAC systems of FIGS. 1-4 , illustrating a movable partition 110 in a first position.
- the air economizer 100 may be positioned, for example, upstream of the filter 38 and the heat exchanger 30 described above with respect to FIG. 2 . Additionally or alternatively, the air economizer 100 may be positioned between the expansion device 78 and the evaporator 80 of FIG. 4 .
- the air economizer 100 may include the filter 38 and heat exchanger 30 of FIG. 2 disposed therein, or the air economizer 100 may include the evaporator 80 of FIG. 4 disposed therein.
- the air economizer 100 includes an indoor air compartment 102 configured to receive return or indoor air 103 , and an outdoor air compartment 104 configured to receive outdoor air 105 .
- the indoor and outdoor air compartments 102 , 104 are positioned adjacent to each other, and are separated from one another by a wall 108 and the aforementioned partition 110 .
- the partition 110 extends within a gap 112 between an end 114 of the wall 108 and a bank of dampers 120 .
- the partition 110 may be coupled to the wall 108 at an anchor point 116 .
- the anchor point 116 may be translatable in a direction 118 extending along the fixed wall 108 of the economizer 100 , and/or rotatable in a circumferential direction 119 about the anchor point 116 .
- the bank of dampers 120 includes four dampers 120 . Two of the dampers 120 are illustrated as receiving the indoor air 103 from the indoor air compartment 102 , and two of the dampers 120 are illustrated as receiving the outdoor air 105 from the outdoor air compartment 104 .
- the dampers 120 may be independently positioned by a controller 122 to enable a certain volumetric flow rate of air therethrough. For example, positioning of the dampers 120 may include closing or opening the dampers 120 to a certain extent to enable a certain volumetric flow rate of air therethrough.
- the dampers 120 receiving the outdoor air 105 may be positioned to reduce the amount of outdoor air 105 passed through the outdoor air compartment 104 and across the corresponding dampers 120 over an operating period of time, which may be referred to as “volumetric flow rate.”
- the amount of outdoor air 105 is just enough to ventilate the indoor air 103 , without undesirably heating the indoor air 103 .
- the dampers 120 may be independently positioned, or positioned as parts of discrete groups, namely, indoor intake section and outdoor intake section groups.
- sizes of indoor and outdoor air compartments may be static or fixed.
- a pressure drop across the dampers may occur, since the relative amounts of air do not correspond with the amount of available damper space receiving the air.
- a pressure drop may occur when the compartments receive relatively different volumetric flow raters of air. Air stratification across the dampers of the traditional embodiment may also occur because of these differences. Air stratification and pressure drops generally reduce an efficiency of the economizer.
- the partition 110 illustrated in FIG. 5 is movable to dynamically size the indoor air compartment 102 and the outdoor air compartment 104 .
- the indoor air compartment 102 may be positioned or set to receive a different amount of indoor air 103 , over an operating period of time, than the amount of outdoor air 105 the outdoor air compartment 104 is configured to receive over the operating period of time based on its position or setting.
- the differences in volumetric flow rates may be determined and desired based on desired cooling and ventilation aspects.
- the bank of dampers 120 may extend along a damper space 130 (e.g., damper length), which refers to the combined lengths of the dampers 120 across the air economizer 100 , as opposed to a one-dimensional distance across the air economizer 100 .
- the damper space 130 may be a combination of rectilinear or curvilinear lengths 150 of the dampers 120 , as opposed to a one-dimensional measurement of a width 132 of the air economizer 100 itself, since the dampers 120 may be angled in, for example, an arcuate segment through the air economizer 100 .
- the controller 122 may determine and set positions of the dampers 120 , where “positions of the damper 120 ” refers to an amount of opening or restriction of the damper 120 .
- the controller 122 may determine and set the positions of the dampers 120 based on sensor feedback received from a sensor 123 or series of sensors of the air economizer 100 or HVAC system.
- the sensor(s) 123 may detect, for example, ambient conditions, operating conditions, conditions of the space requiring conditioning by the HVAC system, or a combination thereof.
- Ambient conditions may include a temperature of the outdoor air 105 , a contaminant content of outdoor air 105 , a humidity of outdoor air 105 , or a combination thereof.
- Conditions of the space requiring conditioning may include a temperature of indoor air 103 , a contaminant content of indoor air 103 , a humidity of indoor air 103 , or a combination thereof.
- Operating conditions may include current damper 120 positions, current partition 110 position, or other conditions.
- the controller 122 may also set the position of the partition 110 to align sizes of the indoor and outdoor air compartments 102 , 104 with the positions of the dampers 120 , which may be referred to as “settings” of the dampers 120 .
- the positions/settings of the dampers 120 determine the volumetric flow rates of air through the indoor and outdoor air compartments 102 , 104 .
- the anchor point 116 of the partition 110 may be coupled to a motor 117 , which is communicatively coupled with the controller 122 .
- the controller 122 may instruct the motor 117 to drive the anchor point 116 to rotate, which moves the partition 110 toward an appropriate partition position.
- the controller 122 aligns the sizes of the compartments 102 , 104 not only with the positions/settings of the dampers 120 , but with the corresponding volumetric flow rates of the indoor air 103 and outdoor air 105 that are dependent on the positions/settings of the dampers 120 .
- a percentage of the amount of available damper space 130 devoted to receipt of the indoor air 103 may correspond with the percentage of the amount of total air volume 124 formed by the received indoor air 103 over an operating period of time.
- a percentage of the amount of available damper space 130 devoted to receipt of the outdoor air 105 may correspond with the percentage of the amount of total air volume 124 formed by the received outdoor air 105 over the operating period of time.
- the controller 122 determines the assignment of certain dampers 120 to the indoor air compartment 102 and certain dampers 120 to the outdoor air compartment 104 .
- FIG. 6 illustrates the partition 110 positioned such that 25% of the damper space 130 , or one damper 120 , receives the indoor air 103 , and 75% of the damper space 130 , or three dampers 120 , receives the outdoor air 105 .
- one damper 120 forms an indoor damper space 131
- three dampers 120 form an outdoor damper space 133
- the combined indoor damper space 131 and outdoor damper space 133 form the combined damper space 130 of the air economizer 100 .
- the controller 122 instructs the positions of the dampers 120 , the assignment of the dampers 120 to the indoor and outdoor intake sections 102 , 104 , and the position of the partition 110 . In doing so, the amount of air passed through the indoor damper 120 over a period of time is aligned with the size of the indoor damper space 131 , and the amount of air passed through the outdoor dampers 120 over the period of time is aligned with the size of the outdoor damper space 133 .
- align may refer to a minimization or reduction of a difference between a first ratio indicative of the relative amounts of indoor and outdoor air 103 , 105 received by the air economizer 100 and a second ratio indicative of the relative lengths of the indoor and outdoor damper space 131 , 133 noted above.
- “Matching” the first ratio indicative of the relative amounts of indoor and outdoor air 103 , 105 received by the air economizer 100 with the second ratio indicative of the relative sizes/lengths of the indoor and outdoor damper space 131 , 133 may refer to an embodiment where the first ratio between the relative amounts of indoor and outdoor air 103 , 105 received by the air economizer 100 is equal to the second ratio between the lengths of the indoor and outdoor damper space 131 , 133 .
- FIG. 7 illustrates the partition 110 positioned such that 75%, or three dampers 120 , of the damper space 130 receives the indoor air 105 , and 25%, or one damper 120 , of the damper space 130 receives the outdoor air 105 .
- FIG. 7 may correspond with an operating mode in which the controller 122 positions the three dampers 120 associated with the indoor air compartment 102 to receive 75% of the total air volume 124 , and the single damper 120 associated with the outdoor air compartment 104 to receive 25% of the total air volume 124 .
- the indoor damper space 131 of FIG. 6 forms only 25% of the total damper space 130 of FIG. 6
- the indoor damper space 131 of FIG. 7 forms 75% of the total damper space 130 of FIG. 7 .
- the assignment of the dampers 120 illustrated in FIG. 7 differs from the assignment of the dampers 120 illustrated in FIG. 6 .
- the partition 110 may be positioned by the controller 122 to assign zero dampers 120 to the indoor air compartment 102 and four dampers 120 to the outdoor air compartment 104 , one damper 120 to the indoor air compartment 102 and three dampers 120 to the outdoor air compartment 104 , two dampers 120 to the indoor air compartment 102 and two dampers 120 to the outdoor air compartment 104 , three dampers 120 to the indoor air compartment 102 and one damper 120 to the outdoor air compartment 104 , or four dampers 120 to the indoor air compartment 102 and zero dampers 120 to the outdoor air compartment 104 .
- the partition 110 includes at least five possible positions.
- the controller 122 may determine the positions of the dampers 120 to more discretely affect the amounts of indoor and outdoor air 103 , 105 as a fraction of the total air volume 124 .
- the dampers 120 may be positioned such that 20% of the total air volume 124 is the indoor air 103 , and 80% of the total air volume 124 is the outdoor air 105 .
- the controller 122 may position the partition 110 to assign 25% of the damper space 130 , or one damper 120 , to the indoor air compartment 102 and 75% of the damper space 130 , or three dampers 120 , to the outdoor air compartment 104 .
- the controller 122 may instruct the damper positions, damper assignments, and partition position to align to reduce differences between a first ratio indicative of relative volumetric flow rates and a second ratio indicative of relative compartment/damper sizing.
- aligning may refer to a minimization or reduction of a difference between the first ratio indicative of the relative amounts of indoor and outdoor air 103 , 105 received by the air economizer 100 and the second ratio indicative of the relative lengths of the indoor and outdoor damper space 131 , 133 noted above.
- “Matching” the first ratio indicative of the relative amounts of indoor and outdoor air 103 , 105 with the second ratio indicative of the relative lengths of the indoor and outdoor damper space 131 , 133 may refer to an embodiment where the first ratio is substantially equal to the second ratio. Whether the ratios are aligned or matched, the aforementioned pressure drop and/or air stratification are significantly reduced compared to traditional embodiments in which the compartment sizes and damper space are static and/or equal.
- dampers 120 may be included. Including more dampers 120 in the available damper space 130 facilitates a reduced and improved step size between available partition positions. In other words, more dampers 120 may enable a more accurate dynamic sizing of compartments 102 , 104 , as a function of segmenting the damper space 130 . Put differently, more dampers 120 may enable a more precise assignment of dampers 120 to the corresponding compartments 102 , 104 , as a function of the amounts of air 103 , 105 desired to pass through the compartments 102 , 104 , respectively. Three, four, five, six, seven, eight, nine, ten, or more dampers 120 may be included.
- the partition 110 could be positioned to assign 0% of the dampers 120 to the indoor air compartment 102 , 10% of the dampers 120 to the indoor air compartment 102 , 20% of the dampers 120 to the indoor air compartment 102 , and so on up to 100%.
- the number of available positions of the partitions 110 may be equal to the number of dampers 120 plus one.
- FIGS. 8 and 9 are cross-sectional overhead views of schematic diagrams illustrating embodiments of the air economizer 100 for use in any of the HVAC systems of FIGS. 1-4 .
- FIG. 8 includes dampers 120 having rectangular or rectilinear cross-sections from the illustrated view
- FIG. 9 includes dampers 120 having curvilinear or arcuate cross-sections from the illustrated view.
- each damper 120 includes a linear length 150
- each damper 120 includes a curvilinear or arcuate length 152 .
- the dampers 120 of a given air economizer 100 may be substantially equally sized, as shown in the illustrated embodiments.
- the anchor point 116 coupling the partition 110 with the wall 108 is translatable in the direction 118 , as previously described.
- the anchor point 116 may include an extension disposed within a slot 140 formed in the wall 108 of the air economizer 100 .
- the anchor point 116 may slide in the direction 118 within the slot 140 to provide a clearance between the partition 110 and the damper 120 over which the partition 110 passes en route to the second position 142 .
- the movement within the slot 140 may be caused by the partition 110 abutting the damper 120 en route to the second position 142 , or the motor 117 or an additional motor may be utilized to cause the anchor point 116 to slide within the slot 140 .
- the partition 110 since the movement of the partition 110 is circumferential in nature but the dampers 120 having linear lengths 150 do not form a perfectly circular or arcuate segment, the partition 110 may be drawn/pushed back or receded from the damper(s) 120 during movement between positions of the partition 110 , by way of the above described translation along direction 118 .
- dampers 120 having arcuate lengths 152 as shown in FIG.
- the dampers 120 are arranged to form a circular or arcuate segment as shown in FIG. 9 , the movement of the anchor point 116 along the direction 118 may not be utilized. In other words, the slot 140 and corresponding translation of the anchor point 116 along the direction 118 may not be included in an embodiment having dampers 120 that form flush, arcuate segments.
- FIG. 10 is a close-up view illustrating an embodiment of a coupling mechanism 160 between the partition 110 of the air economizer 100 of FIG. 5 and a contact point 162 between dampers 120 of the air economizer 100 .
- the partition 110 may merely contact, or come within close proximity to, the contact point 162 .
- the contact point 162 is illustrated in FIG. 10 as a cylindrical or circular part disposed between two dampers 120 , the contact point 162 may be an edge or edges of one or both of the dampers 120 .
- the cylindrically shaped contact point 162 includes a contact point cavity 164 into which a partition extension 166 of the partition 110 extends.
- the partition 110 may be controlled, as previously described, to move to the position having the illustrated contact point 162 , and the partition 110 may be controlled to actuate the partition extension 166 into the cavity 164 .
- the contact point 162 may include a contact point extension 168 configured to extend into a partition cavity 170 of the partition 110 .
- Other coupling mechanisms may also be used, such as fasteners, adhesives, magnetics, springs, etc.
- FIG. 12 is a flow chart illustrating an embodiment of a method 200 of operating an air economizer to dynamically size compartments therein.
- the method 200 includes detecting block 202 ambient conditions, operating conditions, conditions of the space requiring conditioning by the HVAC system, or a combination thereof, as indicated by block 202 .
- one or more sensors may be utilized to detect the conditions noted in block 202 .
- Ambient conditions may include a temperature of outdoor air, a contaminant content of outdoor air, a humidity of outdoor air, or a combination thereof.
- Conditions of the space requiring conditioning may include a temperature of indoor air, a contaminant content of indoor air, a humidity of indoor air, or a combination thereof.
- Operating conditions may include current damper positions, current partition position, or other conditions.
- the method 200 also includes determining and instructing positions/settings of the dampers, as indicated by block 204 .
- the “position of the damper” refers to the setting indicative of an extent of opening or restriction of the damper, as opposed to literal movement of the damper between locations inside the air economizer.
- the positions of the dampers may be determined and instructed by the controller, based on the sensor feedback noted in block 202 above.
- the method 200 also includes determining and instructing assignment of the dampers to the indoor air compartment and to the outdoor air compartment, as indicated by block 206 .
- certain dampers of the bank of dampers are assigned to the indoor air compartment and certain dampers of the bank of dampers are assigned to the outdoor air compartment.
- the dampers assigned to the indoor air compartment are controlled by the controller to include the desired damper positions for the indoor air compartment, and the dampers assigned to the outdoor air compartment are controlled by the controller to include the desired damper positions of the outdoor air compartment.
- the method 200 also includes determining and instruction a partition position, as indicated by block 208 .
- the dampers of the bank of dampers are assigned to the indoor air compartment and the outdoor air compartment.
- the assignments of the dampers are dependent on the position of the partition, which segments the total damper space into the indoor damper space, which includes the dampers that receive the indoor air, and the outdoor damper space, which includes the dampers that receive the outdoor air.
- the partition position and the assignment of the dampers align a first ratio indicative of the relative amounts of air flow through the indoor damper space and the outdoor damper space with a second ratio indicative of the relative lengths of the indoor damper space and outdoor damper space.
- align may refer to a minimization of a difference between the relative amounts of air and the relative lengths noted above.
- “Matching” the first ratio indicative of the relative amounts of indoor and outdoor air with the second ratio indicative of the relative lengths of the indoor and outdoor damper space may refer to an embodiment where the first ratio and the second ratio are equal.
- FIG. 13 is a cross-sectional overhead view of a schematic diagram of an embodiment of the air economizer 100 for use in any of the HVAC systems illustrated in FIGS. 1-4 .
- the air economizer 100 does not include dampers. Instead, the indoor air compartment 102 and the outdoor air compartment 104 are separated from each other by the wall 108 and the partition 110 without dampers positioned downstream from the partition 110 . Thus, the indoor air 103 received by the indoor air compartment 102 and the outdoor air 105 received by the outdoor air compartment 104 flow through an air flow space 300 , as opposed to the damper space 130 described with respect to FIGS. 5-11 .
- the air flow space 300 includes an indoor air flow space 302 which receives the indoor air 103 from the indoor air compartment 102 , and an outdoor air flow space 304 which receives the outdoor air 105 from the outdoor air compartment 104 .
- Relative sizes of the indoor air flow space 302 and the outdoor air flow space 304 are adaptable based on the position of the partition 110 .
- the position of the partition 110 in the illustrated embodiment determines sizes of the indoor and outdoor air flow spaces 302 , 304 .
- the sizes of the indoor and outdoor air flow spaces 302 , 304 may determine the amount of indoor air 103 received by the indoor air compartment 102 and the amount of outdoor air 105 received by the outdoor air compartment 104 .
- the position of the partition 110 in the illustrated embodiment may determine conditions of the air flows through the air economizer 100 , and the sizes of the compartments 102 , 104 , thereby reducing or substantially negating undesirable pressure differentials and air stratification within the air economizer 100 .
- embodiments of the present disclosure may provide one or more technical effects useful in enhancing efficiency of a heat exchanger of an HVAC system.
- embodiments of the present disclosure include an air economizer having dynamically sized or modified indoor/outdoor air compartments.
- the dynamic sizing/modification of the indoor/outdoor air compartments and corresponding control features may enable alignment of the air flow conditions through the compartments with the sizes of the compartments, thereby reducing pressure differentials and air stratification in the air economizer.
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Abstract
Description
- This application claims priority to and the benefit of U.S. Provisional Application Ser. No. 62/431,136, filed Dec. 7, 2016, entitled “DYNAMIC SIZING OF ECONOMIZER COMPARTMENTS AND CONTROLS STRATEGY,” the disclosure of which is hereby incorporated by reference in its entirety for all purposes.
- The present disclosure relates generally to heating, ventilation, and air conditioning (HVAC) systems, and, more particularly, to configurations of air intake sections of the HVAC system.
- A wide range of applications exist for HVAC systems. For example, residential, light commercial, commercial, and industrial systems are used to control temperatures and air quality in residences and buildings. Generally, HVAC systems may circulate a fluid, such as a refrigerant, through a closed loop between an evaporator coil where the fluid absorbs heat and a condenser where the fluid releases heat. The fluid flowing within the closed loop is generally formulated to undergo phase changes within the normal operating temperatures and pressures of the system so that quantities of heat can be exchanged by virtue of the latent heat of vaporization of the fluid. A fan may blow air over, or pull air across, the coils of the heat exchanger(s) in order to condition the air. The volume of air passing over the coils of the heat exchanger may include a portion of air returned from a conditioned space of the residence or building, referred to as “return air” or “indoor air”, and a portion of external or ambient air, referred to as “outdoor air,” which may be used to ventilate the indoor air.
- A traditional air economizer of a traditional HVAC system may receive the indoor air and outdoor air, combine the flows thereof, and pass the combined flow over a heat exchange coil. Traditional air economizers may include inefficiencies related to undesired pressure drops within the traditional air economizer. Accordingly, improved air economizers for HVAC systems are desired.
- The present disclosure relates to an air economizer of a heating, ventilation, and air conditioning (HVAC) system. The air economizer includes an outdoor air compartment configured to receive outdoor air and an indoor air compartment configured to receive indoor air. The air economizer also includes a partition extending between the outdoor air compartment and the indoor air compartment. The partition is configured to move between a first position and a second position such that a damper of the air economizer receives the indoor air when the partition is in the first position, and such that the damper receives the outdoor air when the partition is in the second position.
- A method of controlling an air economizer of a heating, ventilation, and air conditioning (HVAC) system includes determining, via a controller, a desired ratio between a first amount of indoor air received by an indoor air compartment of the air economizer and a second amount of outdoor air received by an outdoor air compartment of the air economizer. The method also includes instructing, via the controller and based on the desired ratio, damper settings of dampers of the air economizer. The method also includes adjusting, via the controller, a position of a partition of the air economizer extending between the indoor air compartment and the outdoor air compartment to assign a first group of the dampers to the indoor air compartment and to assign a second group of the dampers to the outdoor air compartment, such that an additional ratio between a first damper space of the first group of dampers and a second damper space of the second group of dampers is aligned with the desired ratio.
- The present disclosure also relates to a heating, ventilation, and air conditioning (HVAC) system having an air economizer. The air economizer includes an air intake having an outdoor intake section and an indoor intake section. The air economizer also includes a partition separating the outdoor intake section from the indoor intake section, where the partition is rotatable to adjust sizes of the outdoor intake section and the indoor intake section based on desired amounts of outdoor air received by the outdoor intake section and indoor air received by the indoor intake section over an operating period of time.
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FIG. 1 is an illustration of an embodiment of a commercial or industrial HVAC system, in accordance with the present techniques; -
FIG. 2 is an illustration of an embodiment of a portion of a packaged unit of the HVAC system shown inFIG. 1 , in accordance with the present techniques; -
FIG. 3 is an illustration of an embodiment of a split system of the HVAC system shown inFIG. 1 , in accordance with the present techniques; -
FIG. 4 is a schematic diagram of an embodiment of a refrigeration system of the HVAC system shown inFIG. 1 , in accordance with the present techniques; -
FIG. 5 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems ofFIGS. 1-4 and having a movable partition in a first position, in accordance with the present techniques; -
FIG. 6 is a cross-sectional overhead view of a schematic diagram of the air economizer ofFIG. 5 having the movable partition in a second position different than the first position ofFIG. 5 , in accordance with the present techniques; -
FIG. 7 is a cross-sectional overhead view of a schematic diagram of the air economizer ofFIG. 5 having the movable partition in a third position different than the first position ofFIG. 5 and the second position ofFIG. 6 , in accordance with the present techniques; -
FIG. 8 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems ofFIGS. 1-4 , in accordance with the present techniques; -
FIG. 9 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems ofFIGS. 1-4 , in accordance with the present techniques; -
FIG. 10 is a close-up view of an embodiment of a coupling mechanism between the partition of the air economizer ofFIG. 5 and a contact point between dampers of the air economizer, in accordance with the present techniques; -
FIG. 11 is a close-up view of an embodiment of a coupling mechanism between the partition of the air economizer ofFIG. 5 and a contact point between dampers of the air economizer, in accordance with the present techniques; -
FIG. 12 is a flow chart illustrating an embodiment of a method of operating an air economizer to dynamically size compartments therein, in accordance with the present techniques; and -
FIG. 13 is a cross-sectional overhead view of a schematic diagram of an embodiment of an air economizer for use in any of the HVAC systems ofFIGS. 1-4 , in accordance with the present techniques. - The present disclosure is directed toward a commercial, industrial, or residential heating, ventilation, and air conditioning system (“HVAC system”). More particularly, the present disclosure is directed toward configurations of an air economizer of the HVAC system.
- For example, a HVAC system may include an air economizer having an indoor or return air intake section or compartment configured to receive indoor air from a space conditioned by the HVAC system, and an outdoor air intake section configured to receive outdoor air from ambient. The outdoor air may be combined with the indoor air to generate a ventilated and/or cooled combined volume of air. The combined volume of air may pass over a coil of a heat exchanger, such as an evaporator coil, and a refrigerant or other fluid passing through the evaporator coil may absorb heat from the combined volume of air, thereby further coiling the combined volume of air.
- The air economizer may be configured such that the indoor air intake section and the outdoor air intake section are positioned adjacent to one another. A bank of dampers may be positioned downstream of the adjacent indoor air intake section and the outdoor air intake section, such that the bank of dampers is configured to receive the combined volume of air described above. The bank of dampers may extend across a damper opening or space. The dampers of the bank may be adjusted or positioned to facilitate an amount of indoor air through the indoor air intake section over a discrete operating period of time, such as a volumetric flow rate of indoor air, and to similarly determine a volumetric flow rate of outdoor air through the outdoor air intake section. The positions of the dampers and corresponding volumetric flow rates of indoor and outdoor air therethrough may be determined based on certain operating conditions, ambient conditions, and/or desired conditions of the space being conditioned. A controller may receive sensor feedback indicative of these conditions, and the controller may instruct positions of the dampers accordingly. For example, if the outdoor air is warmer than the space being conditioned by the HVAC system and cooling is desired, the dampers receiving the outdoor air may be positioned by the controller to reduce the volumetric flow rate of the outdoor air through the outdoor air intake section, such that the outdoor air is just enough to ventilate the indoor air but not substantially heat the indoor air. Alternatively, if the outdoor air is cooler than the space being conditioned by the HVAC system and cooling is desired, the dampers receiving the outdoor air may be positioned by the controller to increase the volumetric flow rate of the outdoor air through the outdoor air intake section to both ventilate and cool the indoor air.
- In accordance with present embodiments, a partition may extend between a portion of the indoor air intake section and a portion of the outdoor air intake section. For example, a wall may separate the indoor air intake section from the outdoor air intake section. A gap may be positioned between an end of the wall and the bank of dampers. The partition may extend within the gap from the end of the wall to the bank of dampers. The partition may be movable, based on instruction from the controller, toward the indoor air intake section and away from the outdoor air intake section in order to contract a volume of the indoor air intake section, and in order to expand a volume of the outdoor air intake section. Likewise, the partition may be movable, based on instruction from the controller, toward the outdoor air intake section and away from the indoor air intake section in order to contract the volume of the outdoor air intake section, and in order to expand the volume of the indoor air intake section. A position of the partition may be determined based on the position of the dampers, which, as described above, may be determined based on operating conditions and/or ambient or environmental conditions. A controller that instructs the damper positions and the movement of the partition may also assign which dampers correspond with the indoor air intake section and which dampers correspond with the outdoor air intake section, as assignment of the dampers to the appropriate air intake section is dependent on the position of the partition. By selectively positioning the partition based on the positions and assignments of the dampers, pressure drops within the air economizer may be reduced, and stratification of the air beyond the dampers may be reduced, thereby improving an efficiency of the air economizer. These and other features will be described in detail below.
- Turning now to the drawings,
FIG. 1 illustrates a heating, ventilating, and air conditioning (HVAC) system for building environmental management that may employ one or more HVAC units. In the illustrated embodiment, abuilding 10 is air conditioned by a system that includes anHVAC unit 12. Thebuilding 10 may be a commercial structure or a residential structure. As shown, theHVAC unit 12 is disposed on the roof of thebuilding 10; however, theHVAC unit 12 may be located in other equipment rooms or areas adjacent thebuilding 10. TheHVAC unit 12 may be a single package unit containing other equipment, such as a blower, integrated air handler, and/or auxiliary heating unit. In other embodiments, theHVAC unit 12 may be part of a split HVAC system, such as the system shown inFIG. 3 , which includes anoutdoor HVAC unit 58 and anindoor HVAC unit 56. - The
HVAC unit 12 is an air cooled device that implements a refrigeration cycle to provide conditioned air to thebuilding 10. Specifically, theHVAC unit 12 may include one or more heat exchangers across which an air flow is passed to condition the air flow before the air flow is supplied to the building. In the illustrated embodiment, theHVAC unit 12 is a rooftop unit (RTU) that conditions a supply air stream, such as environmental air and/or a return air flow from thebuilding 10. After theHVAC unit 12 conditions the air, the air is supplied to thebuilding 10 viaductwork 14 extending throughout thebuilding 10 from theHVAC unit 12. For example, theductwork 14 may extend to various individual floors or other sections of thebuilding 10. In certain embodiments, theHVAC unit 12 may be a heat pump that provides both heating and cooling to the building with one refrigeration circuit configured to operate in different modes. In other embodiments, theHVAC unit 12 may include one or more refrigeration circuits for cooling an air stream and a furnace for heating the air stream. - A
control device 16, one type of which may be a thermostat, may be used to designate the temperature of the conditioned air. Thecontrol device 16 also may be used to control the flow of air through theductwork 14. For example, thecontrol device 16 may be used to regulate operation of one or more components of theHVAC unit 12 or other components, such as dampers and fans, within thebuilding 10 that may control flow of air through and/or from theductwork 14. In some embodiments, other devices may be included in the system, such as pressure and/or temperature transducers or switches that sense the temperatures and pressures of the supply air, return air, and so forth. Moreover, thecontrol device 16 may include computer systems that are integrated with or separate from other building control or monitoring systems, and even systems that are remote from thebuilding 10. -
FIG. 2 is a perspective view of an embodiment of a portion of theHVAC unit 12. For example, the portion of theHVAC unit 12 illustrated inFIG. 2 has certain features, such as panels and an air economizer, removed for clarity. In the illustrated embodiment, theHVAC unit 12 is a single package unit that may include one or more independent refrigeration circuits and components that are tested, charged, wired, piped, and ready for installation. TheHVAC unit 12 may provide a variety of heating and/or cooling functions, such as cooling only, heating only, cooling with electric heat, cooling with dehumidification, cooling with gas heat, or cooling with a heat pump. As described above, theHVAC unit 12 may directly cool and/or heat an air stream provided to thebuilding 10 to condition a space in thebuilding 10. - As shown in the illustrated embodiment of
FIG. 2 , acabinet 24 encloses theHVAC unit 12 and provides structural support and protection to the internal components from environmental and other contaminants. In some embodiments, thecabinet 24 may be constructed of galvanized steel and insulated with aluminum foil faced insulation.Rails 26 may be joined to the bottom perimeter of thecabinet 24 and provide a foundation for theHVAC unit 12. In certain embodiments, therails 26 may provide access for a forklift and/or overhead rigging to facilitate installation and/or removal of theHVAC unit 12. In some embodiments, therails 26 may fit into “curbs” on the roof to enable theHVAC unit 12 to provide air to theductwork 14 from the bottom of theHVAC unit 12 while blocking elements such as rain from leaking into thebuilding 10. - The
HVAC unit 12 includesheat exchangers heat exchangers heat exchangers heat exchangers heat exchangers heat exchanger 28 may function as a condenser where heat is released from the refrigerant to ambient air, and theheat exchanger 30 may function as an evaporator where the refrigerant absorbs heat to cool an air stream. In other embodiments, theHVAC unit 12 may operate in a heat pump mode where the roles of theheat exchangers heat exchanger 28 may function as an evaporator and theheat exchanger 30 may function as a condenser. In further embodiments, theHVAC unit 12 may include a furnace for heating the air stream that is supplied to thebuilding 10. While the illustrated embodiment ofFIG. 2 shows theHVAC unit 12 having two of theheat exchangers HVAC unit 12 may include one heat exchanger or more than two heat exchangers. - The
heat exchanger 30 is located within acompartment 31 that separates theheat exchanger 30 from theheat exchanger 28.Fans 32 draw air from the environment through theheat exchanger 28, where theheat exchanger 28 may be framed within thecabinet 24 of theHVAC unit 12 and/orcontainers 29 below thefans 32. Air may be heated and/or cooled as the air flows through theheat exchanger 28 before being released back to the environment surrounding therooftop unit 12. Ablower assembly 34, powered by a motor hidden from view behind theblower assembly 34, draws air through theheat exchanger 30 to heat or cool the air. The heated or cooled air may be directed to thebuilding 10 by theductwork 14, which may be connected to theHVAC unit 12. Before flowing through theheat exchanger 30, the conditioned air flows through one ormore filters 38 that may remove particulates and contaminants from the air. In some embodiments, an air economizer may be disposed in anarea 33 of theHVAC unit 12 upstream of thefilters 38. Further, in certain embodiments, thefilters 38 may be disposed on the air intake side of theheat exchanger 30 to prevent contaminants from contacting theheat exchanger 30. - The
HVAC unit 12 also may include other equipment for implementing the thermal cycle.Compressors 42 increase the pressure and temperature of the refrigerant before the refrigerant enters theheat exchanger 28. Thecompressors 42 may be any suitable type of compressors, such as scroll compressors, rotary compressors, screw compressors, or reciprocating compressors. In some embodiments, thecompressors 42 may include a pair of hermetic direct drive compressors arranged in adual stage configuration 44. In the illustrated embodiment, thecompressors 42 include twodual stage configurations 44. However, in other embodiments, any number of thecompressors 42 may be provided to achieve various stages of heating and/or cooling. As may be appreciated, additional equipment and devices may be included in theHVAC unit 12, such as a solid-core filter drier, a drain pan, a disconnect switch, an economizer, pressure switches, phase monitors, and humidity sensors, among other things. - The
HVAC unit 12 may receive power through a terminal block, which is hidden from view behind the illustratedcontrol board 48. For example, a high voltage power source may be connected to the terminal block to power the equipment. The operation of theHVAC unit 12 may be governed or regulated by thecontrol board 48. Thecontrol board 48 may include control circuitry connected to a thermostat, sensors, and alarms. One or more of these components may be referred to herein separately or collectively as thecontrol device 16. The control circuitry may be configured to control operation of the equipment, provide alarms, and monitor safety switches. Wiring may connect thecontrol board 48 and the terminal block to the equipment of theHVAC unit 12. -
FIG. 3 illustrates a residential heating andcooling system 50, also in accordance with present techniques. The residential heating andcooling system 50 may provide heated and cooled air to a residential structure, as well as provide outside air for ventilation and provide improved indoor air quality (IAQ) through devices such as ultraviolet lights and air filters. In the illustrated embodiment, the residential heating andcooling system 50 is a split HVAC system. In general, aresidence 52 conditioned by a split HVAC system may includerefrigerant conduits 54 that operatively couple theindoor unit 56 to theoutdoor unit 58. Theindoor unit 56 may be positioned in a utility room, an attic, a basement, and so forth. Theoutdoor unit 58 is typically situated adjacent to a side ofresidence 52 and is covered by a shroud to protect the system components and to prevent leaves and other debris or contaminants from entering the unit. Therefrigerant conduits 54 transfer refrigerant between theindoor unit 56 and theoutdoor unit 58, typically transferring primarily liquid refrigerant in one direction and primarily vaporized refrigerant in an opposite direction. - When the system shown in
FIG. 3 is operating as an air conditioner, aheat exchanger 60 in theoutdoor unit 58 serves as a condenser for re-condensing vaporized refrigerant flowing from theindoor unit 56 to theoutdoor unit 58 via one of therefrigerant conduits 54. In these applications, aheat exchanger 62 of the indoor unit functions as an evaporator. Specifically, theheat exchanger 62 receives liquid refrigerant, which may be expanded by an expansion device, and evaporates the refrigerant before returning it to theoutdoor unit 58. - The
outdoor unit 58 draws environmental air through theheat exchanger 60 using a fan 64 and expels the air above theoutdoor unit 58. When operating as an air conditioner, the air is heated by theheat exchanger 60 within theoutdoor unit 58 and exits the unit at a temperature higher than it entered. Theindoor unit 56 includes a blower orfan 66 that directs air through or across theindoor heat exchanger 62, where the air is cooled when the system is operating in air conditioning mode. Thereafter, the air is passed throughductwork 68 that directs the air to theresidence 52. The overall system operates to maintain a desired temperature as set by a system controller. When the temperature sensed inside theresidence 52 is higher than the set point on the thermostat, or the set point plus a small amount, the residential heating andcooling system 50 may become operative to refrigerate additional air for circulation through theresidence 52. When the temperature reaches the set point, or the set point minus a small amount, the residential heating andcooling system 50 may stop the refrigeration cycle temporarily. - The residential heating and
cooling system 50 may also operate as a heat pump. When operating as a heat pump, the roles ofheat exchangers heat exchanger 60 of theoutdoor unit 58 will serve as an evaporator to evaporate refrigerant and thereby cool air entering theoutdoor unit 58 as the air passes over outdoor theheat exchanger 60. Theindoor heat exchanger 62 will receive a stream of air blown over it and will heat the air by condensing the refrigerant. - In some embodiments, the
indoor unit 56 may include afurnace system 70. For example, theindoor unit 56 may include thefurnace system 70 when the residential heating andcooling system 50 is not configured to operate as a heat pump. Thefurnace system 70 may include a burner assembly and heat exchanger, among other components, inside theindoor unit 56. Fuel is provided to the burner assembly of thefurnace 70 where it is mixed with air and combusted to form combustion products. The combustion products may pass through tubes or piping in a heat exchanger, separate fromheat exchanger 62, such that air directed by theblower 66 passes over the tubes or pipes and extracts heat from the combustion products. The heated air may then be routed from thefurnace system 70 to theductwork 68 for heating theresidence 52. -
FIG. 4 is an embodiment of avapor compression system 72 that can be used in any of the systems described above. Thevapor compression system 72 may circulate a refrigerant through a circuit starting with acompressor 74. The circuit may also include acondenser 76, an expansion valve(s) or device(s) 78, and anevaporator 80. Thevapor compression system 72 may further include acontrol panel 82 that has an analog to digital (A/D)converter 84, amicroprocessor 86, anon-volatile memory 88, and/or aninterface board 90. Thecontrol panel 82 and its components may function to regulate operation of thevapor compression system 72 based on feedback from an operator, from sensors of thevapor compression system 72 that detect operating conditions, and so forth. - In some embodiments, the
vapor compression system 72 may use one or more of a variable speed drive (VSDs) 92, amotor 94, thecompressor 74, thecondenser 76, the expansion valve ordevice 78, and/or theevaporator 80. Themotor 94 may drive thecompressor 74 and may be powered by the variable speed drive (VSD) 92. TheVSD 92 receives alternating current (AC) power having a particular fixed line voltage and fixed line frequency from an AC power source, and provides power having a variable voltage and frequency to themotor 94. In other embodiments, themotor 94 may be powered directly from an AC or direct current (DC) power source. Themotor 94 may include any type of electric motor that can be powered by a VSD or directly from an AC or DC power source, such as a switched reluctance motor, an induction motor, an electronically commutated permanent magnet motor, or another suitable motor. - The
compressor 74 compresses a refrigerant vapor and delivers the vapor to thecondenser 76 through a discharge passage. In some embodiments, thecompressor 74 may be a centrifugal compressor. The refrigerant vapor delivered by thecompressor 74 to thecondenser 76 may transfer heat to a fluid passing across thecondenser 76, such as ambient orenvironmental air 96. The refrigerant vapor may condense to a refrigerant liquid in thecondenser 76 as a result of thermal heat transfer with theenvironmental air 96. The liquid refrigerant from thecondenser 76 may flow through theexpansion device 78 to theevaporator 80. - The liquid refrigerant delivered to the
evaporator 80 may absorb heat from another air stream, such as asupply air stream 98 provided to thebuilding 10 or theresidence 52. For example, thesupply air stream 98 may include ambient or environmental air, return air from a building, or a combination of the two. The liquid refrigerant in theevaporator 80 may undergo a phase change from the liquid refrigerant to a refrigerant vapor. In this manner, theevaporator 80 may reduce the temperature of thesupply air stream 98 via thermal heat transfer with the refrigerant. Thereafter, the vapor refrigerant exits theevaporator 80 and returns to thecompressor 74 by a suction line to complete the cycle. - In some embodiments, the
vapor compression system 72 may further include a reheat coil in addition to theevaporator 80. For example, the reheat coil may be positioned downstream of the evaporator relative to thesupply air stream 98 and may reheat thesupply air stream 98 when thesupply air stream 98 is overcooled to remove humidity from thesupply air stream 98 before thesupply air stream 98 is directed to thebuilding 10 or theresidence 52. - It should be appreciated that any of the features described herein may be incorporated with the
HVAC unit 12, the residential heating andcooling system 50, or other HVAC systems. Additionally, while the features disclosed herein are described in the context of embodiments that directly heat and cool a supply air stream provided to a building or other load, embodiments of the present disclosure may be applicable to other HVAC systems as well. For example, the features described herein may be applied to mechanical cooling systems, free cooling systems, chiller systems, or other heat pump or refrigeration applications. - Further, in accordance with present techniques, a system, assembly, or apparatus for dynamically sizing compartments of an economizer of an air intake section of the
HVAC unit 12 may be incorporated into any one of the systems illustrated inFIGS. 1-4 and described above. For example, the air economizer and corresponding features described below may be disposed in thearea 33 illustrated inFIG. 2 . By dynamically sizing the compartments of the economizer of the air intake section such that the relative sizes of the compartments, or relative amounts of damper space, generally correspond with volumes of air flows therethrough, a pressure drop and air stratification within the air economizer may be reduced, which improves efficiency of theHVAC unit 12. These and other features will be described in detail below. -
FIG. 5 illustrates a cross-sectional overhead view of a schematic diagram of an embodiment of anair economizer 100 for use in any of the HVAC systems ofFIGS. 1-4 , illustrating amovable partition 110 in a first position. Theair economizer 100 may be positioned, for example, upstream of thefilter 38 and theheat exchanger 30 described above with respect toFIG. 2 . Additionally or alternatively, theair economizer 100 may be positioned between theexpansion device 78 and theevaporator 80 ofFIG. 4 . In some embodiments, theair economizer 100 may include thefilter 38 andheat exchanger 30 ofFIG. 2 disposed therein, or theair economizer 100 may include theevaporator 80 ofFIG. 4 disposed therein. In the illustrated embodiment, theair economizer 100 includes anindoor air compartment 102 configured to receive return orindoor air 103, and anoutdoor air compartment 104 configured to receiveoutdoor air 105. The indoor and outdoor air compartments 102, 104 are positioned adjacent to each other, and are separated from one another by awall 108 and theaforementioned partition 110. In the illustrated embodiment, thepartition 110 extends within agap 112 between anend 114 of thewall 108 and a bank ofdampers 120. Thepartition 110 may be coupled to thewall 108 at ananchor point 116. As will be appreciated in view of the discussion with respect toFIG. 8 , theanchor point 116 may be translatable in adirection 118 extending along the fixedwall 108 of theeconomizer 100, and/or rotatable in acircumferential direction 119 about theanchor point 116. - Continuing with the embodiment illustrated in
FIG. 5 , the bank ofdampers 120 includes fourdampers 120. Two of thedampers 120 are illustrated as receiving theindoor air 103 from theindoor air compartment 102, and two of thedampers 120 are illustrated as receiving theoutdoor air 105 from theoutdoor air compartment 104. Thedampers 120 may be independently positioned by acontroller 122 to enable a certain volumetric flow rate of air therethrough. For example, positioning of thedampers 120 may include closing or opening thedampers 120 to a certain extent to enable a certain volumetric flow rate of air therethrough. In one embodiment, if theoutdoor air 105 is warmer than the space being conditioned and cooling is desired, thedampers 120 receiving theoutdoor air 105 may be positioned to reduce the amount ofoutdoor air 105 passed through theoutdoor air compartment 104 and across the correspondingdampers 120 over an operating period of time, which may be referred to as “volumetric flow rate.” Thus, the amount ofoutdoor air 105 is just enough to ventilate theindoor air 103, without undesirably heating theindoor air 103. As noted above, thedampers 120 may be independently positioned, or positioned as parts of discrete groups, namely, indoor intake section and outdoor intake section groups. - In traditional embodiments, sizes of indoor and outdoor air compartments may be static or fixed. When the volumetric flow rate of the indoor air and outdoor air differs in a traditional embodiment, a pressure drop across the dampers may occur, since the relative amounts of air do not correspond with the amount of available damper space receiving the air. In other words, if the sizes of indoor and outdoor air compartments are equal and static, such as in traditional embodiments, a pressure drop may occur when the compartments receive relatively different volumetric flow raters of air. Air stratification across the dampers of the traditional embodiment may also occur because of these differences. Air stratification and pressure drops generally reduce an efficiency of the economizer.
- In accordance with embodiments of the present disclosure, the
partition 110 illustrated inFIG. 5 is movable to dynamically size theindoor air compartment 102 and theoutdoor air compartment 104. For example, as noted above, theindoor air compartment 102 may be positioned or set to receive a different amount ofindoor air 103, over an operating period of time, than the amount ofoutdoor air 105 theoutdoor air compartment 104 is configured to receive over the operating period of time based on its position or setting. The differences in volumetric flow rates may be determined and desired based on desired cooling and ventilation aspects. The bank ofdampers 120 may extend along a damper space 130 (e.g., damper length), which refers to the combined lengths of thedampers 120 across theair economizer 100, as opposed to a one-dimensional distance across theair economizer 100. In other words, thedamper space 130 may be a combination of rectilinear orcurvilinear lengths 150 of thedampers 120, as opposed to a one-dimensional measurement of awidth 132 of theair economizer 100 itself, since thedampers 120 may be angled in, for example, an arcuate segment through theair economizer 100. - As noted above, the
controller 122 may determine and set positions of thedampers 120, where “positions of thedamper 120” refers to an amount of opening or restriction of thedamper 120. For example, thecontroller 122 may determine and set the positions of thedampers 120 based on sensor feedback received from asensor 123 or series of sensors of theair economizer 100 or HVAC system. The sensor(s) 123 may detect, for example, ambient conditions, operating conditions, conditions of the space requiring conditioning by the HVAC system, or a combination thereof. Ambient conditions may include a temperature of theoutdoor air 105, a contaminant content ofoutdoor air 105, a humidity ofoutdoor air 105, or a combination thereof. Conditions of the space requiring conditioning may include a temperature ofindoor air 103, a contaminant content ofindoor air 103, a humidity ofindoor air 103, or a combination thereof. Operating conditions may includecurrent damper 120 positions,current partition 110 position, or other conditions. - In accordance with the present disclosure, the
controller 122 may also set the position of thepartition 110 to align sizes of the indoor and outdoor air compartments 102, 104 with the positions of thedampers 120, which may be referred to as “settings” of thedampers 120. In general, the positions/settings of thedampers 120 determine the volumetric flow rates of air through the indoor and outdoor air compartments 102, 104. For example, theanchor point 116 of thepartition 110 may be coupled to amotor 117, which is communicatively coupled with thecontroller 122. Thecontroller 122 may instruct themotor 117 to drive theanchor point 116 to rotate, which moves thepartition 110 toward an appropriate partition position. Thus, thecontroller 122 aligns the sizes of thecompartments dampers 120, but with the corresponding volumetric flow rates of theindoor air 103 andoutdoor air 105 that are dependent on the positions/settings of thedampers 120. Put differently, a percentage of the amount ofavailable damper space 130 devoted to receipt of theindoor air 103 may correspond with the percentage of the amount oftotal air volume 124 formed by the receivedindoor air 103 over an operating period of time. By extension, a percentage of the amount ofavailable damper space 130 devoted to receipt of theoutdoor air 105 may correspond with the percentage of the amount oftotal air volume 124 formed by the receivedoutdoor air 105 over the operating period of time. - Of course, because the
dampers 120 associated with theindoor air compartment 102 and theoutdoor air compartment 104 may change depending on the position of thepartition 110, thecontroller 122 determines the assignment ofcertain dampers 120 to theindoor air compartment 102 andcertain dampers 120 to theoutdoor air compartment 104. For example,FIG. 6 illustrates thepartition 110 positioned such that 25% of thedamper space 130, or onedamper 120, receives theindoor air 103, and 75% of thedamper space 130, or threedampers 120, receives theoutdoor air 105. Thus, onedamper 120 forms anindoor damper space 131, threedampers 120 form anoutdoor damper space 133, and the combinedindoor damper space 131 andoutdoor damper space 133 form the combineddamper space 130 of theair economizer 100. As noted above, thecontroller 122 instructs the positions of thedampers 120, the assignment of thedampers 120 to the indoor andoutdoor intake sections partition 110. In doing so, the amount of air passed through theindoor damper 120 over a period of time is aligned with the size of theindoor damper space 131, and the amount of air passed through theoutdoor dampers 120 over the period of time is aligned with the size of theoutdoor damper space 133. It should be noted that “align” may refer to a minimization or reduction of a difference between a first ratio indicative of the relative amounts of indoor andoutdoor air air economizer 100 and a second ratio indicative of the relative lengths of the indoor andoutdoor damper space outdoor air air economizer 100 with the second ratio indicative of the relative sizes/lengths of the indoor andoutdoor damper space outdoor air air economizer 100 is equal to the second ratio between the lengths of the indoor andoutdoor damper space -
FIG. 7 illustrates thepartition 110 positioned such that 75%, or threedampers 120, of thedamper space 130 receives theindoor air 105, and 25%, or onedamper 120, of thedamper space 130 receives theoutdoor air 105. Accordingly,FIG. 7 may correspond with an operating mode in which thecontroller 122 positions the threedampers 120 associated with theindoor air compartment 102 to receive 75% of thetotal air volume 124, and thesingle damper 120 associated with theoutdoor air compartment 104 to receive 25% of thetotal air volume 124. Thus, while theindoor damper space 131 ofFIG. 6 forms only 25% of thetotal damper space 130 ofFIG. 6 , theindoor damper space 131 ofFIG. 7 forms 75% of thetotal damper space 130 ofFIG. 7 . As noted above, the assignment of thedampers 120 illustrated inFIG. 7 differs from the assignment of thedampers 120 illustrated inFIG. 6 . - It should be noted that, in the embodiments illustrated in
FIGS. 5-7 , fourdampers 120 extend across theavailable damper space 130. Thepartition 110 may be positioned by thecontroller 122 to assign zerodampers 120 to theindoor air compartment 102 and fourdampers 120 to theoutdoor air compartment 104, onedamper 120 to theindoor air compartment 102 and threedampers 120 to theoutdoor air compartment 104, twodampers 120 to theindoor air compartment 102 and twodampers 120 to theoutdoor air compartment 104, threedampers 120 to theindoor air compartment 102 and onedamper 120 to theoutdoor air compartment 104, or fourdampers 120 to theindoor air compartment 102 and zerodampers 120 to theoutdoor air compartment 104. Thus, in the illustrated embodiment, thepartition 110 includes at least five possible positions. However, thecontroller 122 may determine the positions of thedampers 120 to more discretely affect the amounts of indoor andoutdoor air total air volume 124. In other words, for example, thedampers 120 may be positioned such that 20% of thetotal air volume 124 is theindoor air total air volume 124 is theoutdoor air 105. - Since the step size between the available positions of the
partition 110 is such that thepartition 110 may not be set, in the embodiments illustrated inFIGS. 5-7 , to assign the indoor andoutdoor damper space outdoor air air economizer 100, thecontroller 122 may position thepartition 110 to assign 25% of thedamper space 130, or onedamper 120, to theindoor air compartment 102 and 75% of thedamper space 130, or threedampers 120, to theoutdoor air compartment 104. In other words, in embodiments where the damper positions/settings are more finely tunable than the partition positions, thecontroller 122 may instruct the damper positions, damper assignments, and partition position to align to reduce differences between a first ratio indicative of relative volumetric flow rates and a second ratio indicative of relative compartment/damper sizing. Thus, “aligning” may refer to a minimization or reduction of a difference between the first ratio indicative of the relative amounts of indoor andoutdoor air air economizer 100 and the second ratio indicative of the relative lengths of the indoor andoutdoor damper space outdoor air outdoor damper space - Additionally, it should be noted that more than four
dampers 120 may be included. Includingmore dampers 120 in theavailable damper space 130 facilitates a reduced and improved step size between available partition positions. In other words,more dampers 120 may enable a more accurate dynamic sizing ofcompartments damper space 130. Put differently,more dampers 120 may enable a more precise assignment ofdampers 120 to the correspondingcompartments air compartments more dampers 120 may be included. For example, if tendampers 120 are included in theavailable damper space 130, eleven positions for thepartition 110 are possible. Indeed, thepartition 110 could be positioned to assign 0% of thedampers 120 to theindoor air compartment dampers 120 to theindoor air compartment 102, 20% of thedampers 120 to theindoor air compartment 102, and so on up to 100%. In general, the number of available positions of thepartitions 110 may be equal to the number ofdampers 120 plus one. -
FIGS. 8 and 9 are cross-sectional overhead views of schematic diagrams illustrating embodiments of theair economizer 100 for use in any of the HVAC systems ofFIGS. 1-4 .FIG. 8 includesdampers 120 having rectangular or rectilinear cross-sections from the illustrated view, whileFIG. 9 includesdampers 120 having curvilinear or arcuate cross-sections from the illustrated view. In other words, inFIG. 8 , eachdamper 120 includes alinear length 150, whereas inFIG. 9 , eachdamper 120 includes a curvilinear orarcuate length 152. Thedampers 120 of a givenair economizer 100 may be substantially equally sized, as shown in the illustrated embodiments. - In
FIG. 8 , theanchor point 116 coupling thepartition 110 with thewall 108 is translatable in thedirection 118, as previously described. For example, theanchor point 116 may include an extension disposed within aslot 140 formed in thewall 108 of theair economizer 100. As thepartition 110 moves from the middle position illustrated inFIG. 8 toward asecond position 142 illustrated inFIG. 8 by way of thecontroller 122 instruction of themotor 117, theanchor point 116 may slide in thedirection 118 within theslot 140 to provide a clearance between thepartition 110 and thedamper 120 over which thepartition 110 passes en route to thesecond position 142. The movement within theslot 140 may be caused by thepartition 110 abutting thedamper 120 en route to thesecond position 142, or themotor 117 or an additional motor may be utilized to cause theanchor point 116 to slide within theslot 140. In other words, since the movement of thepartition 110 is circumferential in nature but thedampers 120 havinglinear lengths 150 do not form a perfectly circular or arcuate segment, thepartition 110 may be drawn/pushed back or receded from the damper(s) 120 during movement between positions of thepartition 110, by way of the above described translation alongdirection 118. Whendampers 120 havingarcuate lengths 152 as shown inFIG. 9 are included in theair economizer 100, and thedampers 120 are arranged to form a circular or arcuate segment as shown inFIG. 9 , the movement of theanchor point 116 along thedirection 118 may not be utilized. In other words, theslot 140 and corresponding translation of theanchor point 116 along thedirection 118 may not be included in anembodiment having dampers 120 that form flush, arcuate segments. -
FIG. 10 is a close-up view illustrating an embodiment of acoupling mechanism 160 between thepartition 110 of theair economizer 100 ofFIG. 5 and acontact point 162 betweendampers 120 of theair economizer 100. In some embodiments, thepartition 110 may merely contact, or come within close proximity to, thecontact point 162. Further, while thecontact point 162 is illustrated inFIG. 10 as a cylindrical or circular part disposed between twodampers 120, thecontact point 162 may be an edge or edges of one or both of thedampers 120. In the illustrated embodiment, the cylindrically shapedcontact point 162 includes a contact point cavity 164 into which apartition extension 166 of thepartition 110 extends. In other words, thepartition 110 may be controlled, as previously described, to move to the position having the illustratedcontact point 162, and thepartition 110 may be controlled to actuate thepartition extension 166 into the cavity 164. - Alternatively, as shown in
FIG. 11 in a close-up view illustrating an embodiment of thecoupling mechanism 160 between thepartition 110 of theair economizer 100 and acontact point 162 betweendampers 120 of theair economizer 100, thecontact point 162 may include acontact point extension 168 configured to extend into apartition cavity 170 of thepartition 110. Other coupling mechanisms may also be used, such as fasteners, adhesives, magnetics, springs, etc. -
FIG. 12 is a flow chart illustrating an embodiment of amethod 200 of operating an air economizer to dynamically size compartments therein. In the illustrated embodiment, themethod 200 includes detectingblock 202 ambient conditions, operating conditions, conditions of the space requiring conditioning by the HVAC system, or a combination thereof, as indicated byblock 202. For example, one or more sensors may be utilized to detect the conditions noted inblock 202. Ambient conditions may include a temperature of outdoor air, a contaminant content of outdoor air, a humidity of outdoor air, or a combination thereof. Conditions of the space requiring conditioning may include a temperature of indoor air, a contaminant content of indoor air, a humidity of indoor air, or a combination thereof. Operating conditions may include current damper positions, current partition position, or other conditions. - The
method 200 also includes determining and instructing positions/settings of the dampers, as indicated byblock 204. As previously described, the “position of the damper” refers to the setting indicative of an extent of opening or restriction of the damper, as opposed to literal movement of the damper between locations inside the air economizer. The positions of the dampers may be determined and instructed by the controller, based on the sensor feedback noted inblock 202 above. - The
method 200 also includes determining and instructing assignment of the dampers to the indoor air compartment and to the outdoor air compartment, as indicated byblock 206. For example, as previously described, certain dampers of the bank of dampers are assigned to the indoor air compartment and certain dampers of the bank of dampers are assigned to the outdoor air compartment. The dampers assigned to the indoor air compartment are controlled by the controller to include the desired damper positions for the indoor air compartment, and the dampers assigned to the outdoor air compartment are controlled by the controller to include the desired damper positions of the outdoor air compartment. - The
method 200 also includes determining and instruction a partition position, as indicated byblock 208. For example, as noted above inblock 206, the dampers of the bank of dampers are assigned to the indoor air compartment and the outdoor air compartment. The assignments of the dampers are dependent on the position of the partition, which segments the total damper space into the indoor damper space, which includes the dampers that receive the indoor air, and the outdoor damper space, which includes the dampers that receive the outdoor air. The partition position and the assignment of the dampers align a first ratio indicative of the relative amounts of air flow through the indoor damper space and the outdoor damper space with a second ratio indicative of the relative lengths of the indoor damper space and outdoor damper space. It should be noted that “align” may refer to a minimization of a difference between the relative amounts of air and the relative lengths noted above. “Matching” the first ratio indicative of the relative amounts of indoor and outdoor air with the second ratio indicative of the relative lengths of the indoor and outdoor damper space may refer to an embodiment where the first ratio and the second ratio are equal. -
FIG. 13 is a cross-sectional overhead view of a schematic diagram of an embodiment of theair economizer 100 for use in any of the HVAC systems illustrated inFIGS. 1-4 . In the illustrated embodiment, theair economizer 100 does not include dampers. Instead, theindoor air compartment 102 and theoutdoor air compartment 104 are separated from each other by thewall 108 and thepartition 110 without dampers positioned downstream from thepartition 110. Thus, theindoor air 103 received by theindoor air compartment 102 and theoutdoor air 105 received by theoutdoor air compartment 104 flow through an air flow space 300, as opposed to thedamper space 130 described with respect toFIGS. 5-11 . The air flow space 300 includes an indoorair flow space 302 which receives theindoor air 103 from theindoor air compartment 102, and an outdoorair flow space 304 which receives theoutdoor air 105 from theoutdoor air compartment 104. Relative sizes of the indoorair flow space 302 and the outdoorair flow space 304 are adaptable based on the position of thepartition 110. In other words, the position of thepartition 110 in the illustrated embodiment determines sizes of the indoor and outdoorair flow spaces air flow spaces indoor air 103 received by theindoor air compartment 102 and the amount ofoutdoor air 105 received by theoutdoor air compartment 104. Thus, the position of thepartition 110 in the illustrated embodiment may determine conditions of the air flows through theair economizer 100, and the sizes of thecompartments air economizer 100. - One or more of the disclosed embodiments, alone or in combination, may provide one or more technical effects useful in enhancing efficiency of a heat exchanger of an HVAC system. For example, in general, embodiments of the present disclosure include an air economizer having dynamically sized or modified indoor/outdoor air compartments. The dynamic sizing/modification of the indoor/outdoor air compartments and corresponding control features may enable alignment of the air flow conditions through the compartments with the sizes of the compartments, thereby reducing pressure differentials and air stratification in the air economizer.
- While only certain features and embodiments of the present disclosure have been illustrated and described, many modifications and changes may occur to those skilled in the art without materially departing from the novel teachings and advantages of the subject matter recited in the claims. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the disclosure. Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not have been described. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
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US15/833,632 US20180156490A1 (en) | 2016-12-07 | 2017-12-06 | Dynamic sizing of damper sections and/or air economizer compartments |
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US15/833,632 US20180156490A1 (en) | 2016-12-07 | 2017-12-06 | Dynamic sizing of damper sections and/or air economizer compartments |
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CN111174291A (en) * | 2018-10-24 | 2020-05-19 | 青岛海尔空调器有限总公司 | Movable air conditioner and fresh air control method thereof |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4086781A (en) * | 1976-04-23 | 1978-05-02 | International Telephone & Telegraph Corporation | Variable air volume air conditioning system |
US4336748A (en) * | 1979-09-30 | 1982-06-29 | Axis Products Limited | Fluid exchanger |
US5564626A (en) * | 1995-01-27 | 1996-10-15 | York International Corporation | Control system for air quality and temperature conditioning unit with high capacity filter bypass |
US5605051A (en) * | 1991-04-26 | 1997-02-25 | Nippondenso Co., Ltd. | Automotive air conditioner having condenser and evaporator provided within air duct |
US5934994A (en) * | 1997-03-12 | 1999-08-10 | Beutler Heating & Air Conditioning | Damper apparatus including plenum and multiple damper blades |
US6009934A (en) * | 1996-10-31 | 2000-01-04 | Calsonic Corporation | Electronic climate control system for automotive vehicles |
US6450878B1 (en) * | 1999-06-30 | 2002-09-17 | Valeo Climatisation | Ventilation module |
US20070290057A1 (en) * | 2006-06-19 | 2007-12-20 | Ahmed Syed S | Damper assembly for a unit ventilator |
US7434413B2 (en) * | 2005-01-10 | 2008-10-14 | Honeywell International Inc. | Indoor air quality and economizer control methods and controllers |
US20140051345A1 (en) * | 2011-02-04 | 2014-02-20 | Robert Bosch Gmbh | Method for Operating a Ventilation System with a Mixing Chamber |
-
2017
- 2017-12-06 US US15/833,632 patent/US20180156490A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4086781A (en) * | 1976-04-23 | 1978-05-02 | International Telephone & Telegraph Corporation | Variable air volume air conditioning system |
US4336748A (en) * | 1979-09-30 | 1982-06-29 | Axis Products Limited | Fluid exchanger |
US5605051A (en) * | 1991-04-26 | 1997-02-25 | Nippondenso Co., Ltd. | Automotive air conditioner having condenser and evaporator provided within air duct |
US5564626A (en) * | 1995-01-27 | 1996-10-15 | York International Corporation | Control system for air quality and temperature conditioning unit with high capacity filter bypass |
US6009934A (en) * | 1996-10-31 | 2000-01-04 | Calsonic Corporation | Electronic climate control system for automotive vehicles |
US5934994A (en) * | 1997-03-12 | 1999-08-10 | Beutler Heating & Air Conditioning | Damper apparatus including plenum and multiple damper blades |
US6450878B1 (en) * | 1999-06-30 | 2002-09-17 | Valeo Climatisation | Ventilation module |
US7434413B2 (en) * | 2005-01-10 | 2008-10-14 | Honeywell International Inc. | Indoor air quality and economizer control methods and controllers |
US20070290057A1 (en) * | 2006-06-19 | 2007-12-20 | Ahmed Syed S | Damper assembly for a unit ventilator |
US20140051345A1 (en) * | 2011-02-04 | 2014-02-20 | Robert Bosch Gmbh | Method for Operating a Ventilation System with a Mixing Chamber |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111174291A (en) * | 2018-10-24 | 2020-05-19 | 青岛海尔空调器有限总公司 | Movable air conditioner and fresh air control method thereof |
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