WO2005073637A1 - Continuous fan control in a multi-zone hvac system - Google Patents
Continuous fan control in a multi-zone hvac system Download PDFInfo
- Publication number
- WO2005073637A1 WO2005073637A1 PCT/US2005/001632 US2005001632W WO2005073637A1 WO 2005073637 A1 WO2005073637 A1 WO 2005073637A1 US 2005001632 W US2005001632 W US 2005001632W WO 2005073637 A1 WO2005073637 A1 WO 2005073637A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zone
- airflow
- recited
- damper
- continuous
- Prior art date
Links
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
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
- F24F11/523—Indication arrangements, e.g. displays for displaying temperature data
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
-
- 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
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
-
- 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
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
- F24F3/0442—Systems in which all treatment is given in the central station, i.e. all-air systems with volume control at a constant temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- 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
-
- 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
- the present invention relates to a method and control for the continuous fan airflow delivered to each of several zones in a multi-zone HVAC system, and more particularly to a control that allows a specified continuous fan airflow to be delivered simultaneously to all zones of the system.
- Conventional multi-zone HVAC systems include temperature changing components for changing the temperature and condition of air. Indoor air handlers drive air from the temperature changing component through supply ducts to several zones within a building. Each supply duct typically includes dampers that selectively restrict airflow into each zone to achieve a desired temperature.
- the fan airflow delivered to each zone is not adjustable, and the airflow delivered to each zone is dependant on that delivered to other zones.
- each zone will receive half of the system airflow.
- the damper for zone 2 will close.
- Zone 1 will then receive the full system airflow, which would result in twice the amount of airflow as before.
- the variations in continuous fan airflow delivered to any zone may be quite large which may result in unbalanced temperature changes.
- the HVAC system of the present invention provides a control which determines the amount of airflow delivered to each zone independently of the amount of airflow delivered to the other zones within the HVAC system.
- the control determines a nominal system airflow and a relative zone size for each zone in the HVAC system.
- the control determines a nominal zone airflow delivered to each zone based upon the nominal system airflow and a relative size for each zone in the HVAC system.
- the desired continuous fan airflow delivered to each zone is based upon a proportionality constant assigned to a user selected fan airflow level for each specific zone. Once the desired continuous fan airflow for each zone is determined, the desired system airflow is determined by the summation of every zone's desired continuous fan airflow.
- a multi-zone HVAC system provides continuous fan airflow to each zone independently of the continuous fan airflow delivered to any other zone and irrespective of the relative size difference of the zones.
- Figure 1 is a schematic view of a building HVAC system.
- Figure 2 shows exemplary displays at a user interface.
- Figure 3 is a flowchart of the inventive method.
- Figure 4 is a schematic representation of the continuous fan control performed by the HVAC system of the present invention.
- a temperature changing component 22 communicates with an indoor air handler 24.
- the temperature changing component 22 changes the condition of air and typically includes an indoor unit such as a furnace or heater coil, and/or an outdoor unit such as a condensing unit or a heat pump.
- an indoor unit such as a furnace or heater coil
- an outdoor unit such as a condensing unit or a heat pump.
- a plenum 31 Associated with the indoor air handler 24 is a plenum 31.
- Supply ducts 28, 30, and 32 extend between the plenum 31 and distinct zones 1, 2, and 3.
- a damper 34a, 34b, and 34c is located within each supply duct 28, 30 and 32 respectively.
- a zone control 38a, 38b, and 38c (one shown in Figure 2) is associated with distinct zones 1, 2, and 3 respectively.
- a system control 36 communicates with each of the zone controls 38a, 38b, and 38c.
- the system control 36 is preferably a microprocessor or the like.
- the zone controls 38a, 38b, and 38c allow a user to set desired temperatures, airflows etc. for each of the distinct zones 1, 2, and 3 respectively.
- the zone controls 38a, 38b, and 38c preferably include a temperature sensor for providing an actual temperature back to the system control 36.
- the system control 36 operates the dampers 34, the temperature changing component 22, the indoor air handler 24 and also communicates with zone controls 38a, 38b, and 38c located within each of the distinct zones 1, 2, and 3.
- the data is communicated to the system control 36 which recognizes the user selected criterion and communicates with the temperature changing component 22 to change the condition of the air provided by the indoor air handler 24 accordingly.
- a user may enter fan airflow levels for any zone in the HVAC system from a single zone control 38a, 38b or 38c.
- the indoor air handler 24 communicates the air from return ducts 26a, 26b, and 26c, conditions the air, and drives the conditioned air into the plenum 31. From the plenum 31, the air enters the supply ducts 28, 30, and 32 associated with the distinct zones 1, 2, and 3.
- the flow of conditioned air communicated to each of the zones 1, 2, and 3 is controlled by the position of the damper 34a, 34b, and 34c located within each of the supply ducts 28, 30, and 32.
- the dampers 34a, 34b, and 34c may be selectively opened or closed to restrict or allow additional airflow into the zones 1, 2, and 3.
- the damper 34a, 34b, and 34c may be positioned at incremental positions between the full open and the full closed positions.
- a computational process stored within the system control 36 to determine a desired quantity of continuous fan airflow in each zone of the HVAC system is illustrated in flowchart form.
- the nominal system airflow (Anomsys) is determined.
- Anomsys represents the total system airflow normally delivered by the indoor air handler 24 to each zone with all the zone dampers 34a, 34b, and 34c open in either the cooling or heating operating modes, whichever is higher.
- the system determines the relative sizes of the duct segments associated with each zone in the system. This is shown at step B. For further understanding of the size determination of duct segments associated with a zone in an HVAC system, attention is directed to co-pending U.S. Patent Application Serial No.
- the algorithm disclosed therein relates to a determination of the sizes of the ducts 28, 30, and 32 associated with the distinct zones 1, 2, and 3 such that when any system airflow is delivered by the air handler 24 with the dampers 34a, 34b, and 34c full open, each zone 1, 2, and 3 receives an amount of the airflow in proportion to the zone's duct segment size relative to the combined size of all the zone duct segments.
- the nominal system airflow (Anomsys) value and the relative duct size (Si) information are utilized to calculate nominal zone airflow (Anomi) values.
- the nominal zone airflow for zone i represents zone i's portion of the nominal system airflow (Anomsys), based upon the relative size of each zone i in relation to the combined size of the total number of zones (zones 1, 2 and 3).
- a proportionality constant (Pi) is selected for each of zones 1, 2, and 3 in response to a user selected fan airflow level at step D.
- a user selects one of four levels of airflow for each zone: HIGH, MEDIUM, LOW, and OFF.
- the proportionality constant assigned to zone i by the system control 36 is as follows: Selected Level of Airflow Pi HIGH 100% MEDIUM 75% LOW 50% OFF 0% It should be understood that other airflow levels and associated proportionality constant (Pi) percentages may also be utilized by the present invention.
- the desired continuous fan airflow (Ai) for each zone 1, 2, and 3 is individually calculated by utilizing the nominal zone airflow (Anomi) value and the user assigned proportionality constant (Pi).
- the desired continuous fan airflow (Ai) value represents the portion of the nominal system airflow actually delivered to each zone i based upon that zone's relative size in comparison to the combined size of all the zones and the user selected fan airflow level.
- the system then proceeds to step F in which the dampers 34a, 34b, and 34c for each of zone i are modulated to a position Di as commanded by the system control 36.
- the position Di, or the percent travel of the damper blade from the fully closed to the fully open position, is equal to the proportionality constant (Pi).
- the damper 34 characteristics are linear.
- the system control 36 computes the desired system airflow (Asys) at step G.
- the desired continuous fan airflow (Ai) for each zone i is utilized in making this determination.
- the desired system airflow (Asys) represents the total amount of airflow delivered by the air handler 24 to be divided appropriately among the zones 1, 2 and 3 in relation to the relative size and the user selected fan airflow level for each zone.
- zone controls 38a, 38b, and 38c contain a zone key 42.
- the zone key 42 is utilized to select between the zones 1, 2, and 3 the level of fan airflow to be delivered by the indoor air handler 24.
- the zone controls 38a, 38b, and 38c also provide a user with the current temperature in each of the zones 1, 2, and 3.
- a multiple of zones which includes the HVAC system 20 of the present invention is illustrated in schematic form. For example only, three zones are present with zone 1 being three times the size of zone 2, and zone 3 being twice the size of zone 2.
- the relative zone duct size Si for each zone is as follows: 50% for zone 1, 17% for zone 2, and 33% for zone 3.
- the user selected fan airflow level is set at high at zone controls 38a, 38b, and 38c for zone 1, zone 2, and zone 3 respectively.
- the control of the present invention calculates the required amount of continuous airflow to be delivered by indoor air handler 24 to zone 1, zone 2 and zone 3. Because each zone is set at high, all dampers 34a, 34b, and 34c are set at full open position.
- zone 1 receives 525 cubic feet per minute of airflow
- zone 2 receives 175 cubic feet per minute of airflow
- zone 3 receives 350 cubic feet per minute of airflow.
- the full nominal system airflow of 1050 cubic feet per minute is delivered by indoor air handler 24 as commanded by the system control 36.
- zone 1 requires 525 cubic feet per minute of airflow as the user selected fan airflow level for zone 1 has not changed.
- Zone 2 requires a lower amount of airflow due to the change in the user selected fan airflow level from high to low.
- zone 2 requires half the amount of airflow than that delivered at a high fan setting as the proportionality constant for a high fan setting is 100% while the proportionality constant for the low setting is 50%.
- Zone 2 requires 87.5 cubic feet per minute of airflow.
- Zone 3 requires zero airflow as the user selected fan airflow level for zone 3 was set at off.
- the system control 36 adjusts the amount of desired system airflow delivered by the indoor air handler 24 to reflect the change in desired user inputs resulting in a delivered system airflow equal to 612.5 cubic feet per minute.
- a user adjusts the fan airflows at zone controls 38a, 38b, or 38c to a high airflow in zone 1, a low airflow in zone 2, and a medium airflow in zone 3.
- the damper 34a for zone 1 is at full open position
- the damper 34b for zone 2 is at an intermediate position allowing 50% of the nominal zone 2 airflow
- the damper 34c for zone 3 is at an intermediate position allowing 75% of the nominal zone 3 airflow.
- zone 1 requires 525 cubic feet per minute of airflow and zone 2 requires 87.5 cubic feet perm minute of airflow as the user selected fan airflow levels for these zones have not changed.
- Zone 3 requires a higher amount of airflow due to the change in the user selected fan airflow level from an off setting to a medium setting. Based on the relative size of zone 3 (33%) and the user selected fan airflow level of medium (75%), zone 3 requires 262.5 cubic feet per minute of airflow.
- the system control 36 adjusts the amount of desired system airflow delivered by indoor air handler 24 to reflect the change in desired user inputs resulting in a delivered system airflow equal to 875 cubic feet per minute.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2005208295A AU2005208295A1 (en) | 2004-01-20 | 2005-01-18 | Continuous fan control in a multi-zone HVAC system |
EP05705878A EP1709368A4 (en) | 2004-01-20 | 2005-01-18 | Continuous fan control in a multi-zone hvac system |
CN2005800026513A CN1910407B (en) | 2004-01-20 | 2005-01-18 | Continuous fan control in a multi-zone HVAC system |
HK07107748.3A HK1103434A1 (en) | 2004-01-20 | 2007-07-18 | Continuous fan control in a multi-zone hvac system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53752604P | 2004-01-20 | 2004-01-20 | |
US60/537,526 | 2004-01-20 | ||
US10/968,497 | 2004-10-19 | ||
US10/968,497 US7036743B2 (en) | 2004-01-20 | 2004-10-19 | Continuous fan control in a multi-zone HVAC system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005073637A1 true WO2005073637A1 (en) | 2005-08-11 |
Family
ID=34753091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/001632 WO2005073637A1 (en) | 2004-01-20 | 2005-01-18 | Continuous fan control in a multi-zone hvac system |
Country Status (7)
Country | Link |
---|---|
US (1) | US7036743B2 (en) |
EP (1) | EP1709368A4 (en) |
KR (1) | KR100732575B1 (en) |
CN (1) | CN1910407B (en) |
AU (1) | AU2005208295A1 (en) |
HK (1) | HK1103434A1 (en) |
WO (1) | WO2005073637A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US11384951B2 (en) | 2017-06-14 | 2022-07-12 | Joseph A. Ross | Zoning system for air conditioning (HVAC) equipment |
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2004
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2005
- 2005-01-18 WO PCT/US2005/001632 patent/WO2005073637A1/en active Application Filing
- 2005-01-18 KR KR1020067013565A patent/KR100732575B1/en not_active IP Right Cessation
- 2005-01-18 AU AU2005208295A patent/AU2005208295A1/en not_active Abandoned
- 2005-01-18 CN CN2005800026513A patent/CN1910407B/en not_active Expired - Fee Related
- 2005-01-18 EP EP05705878A patent/EP1709368A4/en not_active Withdrawn
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2007
- 2007-07-18 HK HK07107748.3A patent/HK1103434A1/en not_active IP Right Cessation
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US4549601A (en) * | 1982-06-21 | 1985-10-29 | Carrier Corporation | Variable volume multizone system |
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US11384951B2 (en) | 2017-06-14 | 2022-07-12 | Joseph A. Ross | Zoning system for air conditioning (HVAC) equipment |
Also Published As
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EP1709368A4 (en) | 2010-08-04 |
HK1103434A1 (en) | 2007-12-21 |
US20050156054A1 (en) | 2005-07-21 |
AU2005208295A1 (en) | 2005-08-11 |
EP1709368A1 (en) | 2006-10-11 |
KR100732575B1 (en) | 2007-06-27 |
KR20060111667A (en) | 2006-10-27 |
US7036743B2 (en) | 2006-05-02 |
CN1910407B (en) | 2010-12-08 |
CN1910407A (en) | 2007-02-07 |
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