EP1953473B1 - Demand control system and method for multi-type air conditioner - Google Patents

Demand control system and method for multi-type air conditioner Download PDF

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Publication number
EP1953473B1
EP1953473B1 EP08150528.1A EP08150528A EP1953473B1 EP 1953473 B1 EP1953473 B1 EP 1953473B1 EP 08150528 A EP08150528 A EP 08150528A EP 1953473 B1 EP1953473 B1 EP 1953473B1
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EP
European Patent Office
Prior art keywords
wattage consumption
air conditioner
wattage
demand control
demand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08150528.1A
Other languages
German (de)
French (fr)
Other versions
EP1953473A1 (en
Inventor
Han-Won Park
Duck-Gu Jeon
Sang-Chul Youn
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LG Electronics Inc
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LG Electronics Inc
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Filing date
Publication date
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Publication of EP1953473A1 publication Critical patent/EP1953473A1/en
Application granted granted Critical
Publication of EP1953473B1 publication Critical patent/EP1953473B1/en
Not-in-force legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • 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
    • F24F11/46—Improving electric energy efficiency or saving
    • F24F11/47—Responding to energy costs
    • 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
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/60—Energy consumption

Definitions

  • the present invention relates to a demand control system and method for a multi-type air conditioner.
  • a demand control regime for a multi-type air conditioner is a technique for controlling the consumption of electrical power by switching on/off an air conditioner randomly selected or selected among a plurality of air conditioners according to a pre-set cycle so as to control the operational efficiency of a multi-type air conditioner within the range of a permissible wattage (i.e., the amount of electrical power).
  • the demand control regime emphasizes electrical power control rather than a user's convenience, and operates to restrict the power consumption by sequentially switching off consumption loads of the electrical power.
  • the related art demand control system for a multi-type air conditioner has the following problem. That is, because the air conditioner to be provided or deprived of electrical power supply is selected without regard to the user's convenience, the user in an area where the air conditioner is forcibly controlled is located may feel substantially less comfortable.
  • DE 10 2004 029331 discloses a central control system of air conditioners and a method for operating the same, wherein the central control system includes a central control unit having a database for storing information of power consumption of a multi-type air conditioning system installed in a building, and the central control unit calculates a total power consumption of air conditioners (i.e., indoor and outdoor units) currently in operation on the basis of the information stored in the database, while performing peak power control to limit the total power consumption below a reference management power value.
  • air conditioners i.e., indoor and outdoor units
  • JP 63 046330 discloses a heat exchanger of a heat pump type wherein a controller compares the actual power consumption which is an integrated result by an integrating wattmeter at the intermediate point of a predetermined period with an interim target value set by an electric power consumption pattern setter in the intermediate point of time.
  • the present invention is directed to provide a demand control system and a demand control method for a multi-type air conditioner which is capable of enhancing a user's comfort as well as of stably maintaining an electrical power, resulting from reducing a wattage consumption by controlling an air conditioner with changing an operation mode of the air conditioner when an estimated wattage exceeds a set wattage.
  • the demand control system for a multi-type air conditioner in accordance with the present invention may include a wattage consumption sensing unit 10 for calculating an estimated wattage consumed by a plurality of air conditioners 50 of a building; and a demand control unit 20 for controlling an operational efficiency of the air conditioners 50 by changing an operation mode of at least one air conditioner 50 of the plurality of air conditioners 50 when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption exceeds the set wattage value.
  • the plurality of air conditioners 50 may each include an outdoor unit 51 and at least one indoor unit 52 connected to the outdoor unit 51.
  • the wattage consumption sensing unit 10 may receive data with respect to the wattage measured from a watt-hour meter 71 by being connected with the watt-hour meter 71 connected with the plurality of air conditioners 50 so as to estimate the consumed wattage after a certain time duration. And then, the wattage consumption sensing unit 10 may sense whether the estimated wattage exceeds a pre-set demand wattage value so that the sensed information may be transferred to the demand control unit 20.
  • the demand control unit 20 may be connected with the wattage consumption wattage sensing unit 10 and to each outdoor unit 51 and indoor unit 52 of the air conditioners 50 so that, when the estimated wattage exceeds the set wattage value, the operation mode of the air conditioners 50 may be sequentially changed so as to reduce the wattage consumption of the plurality of air conditioners 50.
  • the demand control unit 20 may switch off the outdoor units 51 of the air conditioners so that the operation mode of the indoor unit 52 in a corresponding area may be changed into a blowing (fan only) mode for reducing the wattage consumption of the air conditioners 50.
  • the demand control unit 20 may change the operation mode of the indoor units 52 into the blowing (fan only) mode by switching off the outdoor unit 51, and also into another operation mode that can reduce the power consumption by changing into a dehumidifying mode, changing a blowing amount, controlling a circulation speed of a refrigerant, or the like.
  • changing the operation mode of the air conditioners 50 for reducing the wattage consumption can prevent the temperature in each area from suddenly being changed, comparing with abruptly shutting off the electrical power supply for the air conditioners 50, and accordingly a user in the area where the forcibly controlled air conditioner 50 is located may feel comfortable for a longer time. Also, the time taken until the air conditioner 50 is restored from the forcibly controlled temperature to the prior temperature is shortened, thereby preventing unnecessary energy consumption.
  • the wattage consumption sensing unit 10 may sense whether the estimated wattage exceeds the pre-set wattage value by calculating the estimated wattage based on the information regarding the consumed wattage measured by the watt-hour meter 71, and then transfer the thusly sensed information to the demand control unit 20 (S1).
  • the demand control unit 2 may select at least one outdoor unit 51 (S2).
  • the forcibly controlled outdoor unit 51 may be excluded.
  • the demand control unit 2 changes an operation mode of at least one air conditioner of the plurality of air conditioners. For example, the demand control unit 2 switches the at least one air conditioner into a blowing mode, switches the at least one air conditioner into a dehumidifying mode, changes a blowing amount of the at least one air conditioner, or changes a circulation speed of a refrigerant of the at least one air conditioner
  • the selected outdoor unit 51 may be switched off so that the operation mode of the indoor unit(s) 52 connected with the outdoor unit 51 may be changed into the blowing (fan only) mode (S3), As such, the overall wattage consumption of the air conditioners may be reduced resulting from the switching off of the outdoor unit 51.
  • the wattage consumption sensing unit 10 may sense the information that the estimated wattage falls short of the set wattage value, and then transfer such sensed information to the demand control unit 20. Then, the demand control unit 20 may change the operation mode of the air conditioners controlled in the previous step into a cooling mode or a warming mode from the blowing mode, so that the operation mode of the air conditioners may be restored to their previous original state (S4).
  • the demand control system and the demand control method for a multi-type air conditioner in accordance with the present invention operates to control the operational efficiency of the air conditioners by changing the operation mode of the air conditioners so as to reduce the wattage consumption of the air conditioners when the estimated wattage consumption exceeds a set wattage value, thereby enabling a user in the area where the controlled air conditioner is located to feel comfortable pleasant for a longer time.
  • the time taken until the air conditioner is restored from the forcibly controlled temperature to the prior desired temperature is shortened, thereby preventing unnecessary energy consumption.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Description

  • The present invention relates to a demand control system and method for a multi-type air conditioner.
  • In general, a demand control regime for a multi-type air conditioner is a technique for controlling the consumption of electrical power by switching on/off an air conditioner randomly selected or selected among a plurality of air conditioners according to a pre-set cycle so as to control the operational efficiency of a multi-type air conditioner within the range of a permissible wattage (i.e., the amount of electrical power).
  • The demand control regime emphasizes electrical power control rather than a user's convenience, and operates to restrict the power consumption by sequentially switching off consumption loads of the electrical power.
  • However, the related art demand control system for a multi-type air conditioner has the following problem. That is, because the air conditioner to be provided or deprived of electrical power supply is selected without regard to the user's convenience, the user in an area where the air conditioner is forcibly controlled is located may feel substantially less comfortable.
  • DE 10 2004 029331 discloses a central control system of air conditioners and a method for operating the same, wherein the central control system includes a central control unit having a database for storing information of power consumption of a multi-type air conditioning system installed in a building, and the central control unit calculates a total power consumption of air conditioners (i.e., indoor and outdoor units) currently in operation on the basis of the information stored in the database, while performing peak power control to limit the total power consumption below a reference management power value.
  • JP 63 046330 discloses a heat exchanger of a heat pump type wherein a controller compares the actual power consumption which is an integrated result by an integrating wattmeter at the intermediate point of a predetermined period with an interim target value set by an electric power consumption pattern setter in the intermediate point of time.
  • The present invention is directed to provide a demand control system and a demand control method for a multi-type air conditioner which is capable of enhancing a user's comfort as well as of stably maintaining an electrical power, resulting from reducing a wattage consumption by controlling an air conditioner with changing an operation mode of the air conditioner when an estimated wattage exceeds a set wattage. This object is achieved with a system according to claim 1 and a method according to claim 6. Preferred embodiments are described in the dependent claims. The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
    • Figure 1 is a schematic block diagram showing a demand control system for a multi-type air conditioner in accordance with the present invention; and
    • Figure 2 is a flowchart showing a control method of the demand control system of Figure 1.
  • Description will now be given in detail of the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
  • As shown in Figure 1, the demand control system for a multi-type air conditioner in accordance with the present invention may include a wattage consumption sensing unit 10 for calculating an estimated wattage consumed by a plurality of air conditioners 50 of a building; and a demand control unit 20 for controlling an operational efficiency of the air conditioners 50 by changing an operation mode of at least one air conditioner 50 of the plurality of air conditioners 50 when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption exceeds the set wattage value.
  • The plurality of air conditioners 50 may each include an outdoor unit 51 and at least one indoor unit 52 connected to the outdoor unit 51.
  • The wattage consumption sensing unit 10 may receive data with respect to the wattage measured from a watt-hour meter 71 by being connected with the watt-hour meter 71 connected with the plurality of air conditioners 50 so as to estimate the consumed wattage after a certain time duration. And then, the wattage consumption sensing unit 10 may sense whether the estimated wattage exceeds a pre-set demand wattage value so that the sensed information may be transferred to the demand control unit 20.
  • The demand control unit 20 may be connected with the wattage consumption wattage sensing unit 10 and to each outdoor unit 51 and indoor unit 52 of the air conditioners 50 so that, when the estimated wattage exceeds the set wattage value, the operation mode of the air conditioners 50 may be sequentially changed so as to reduce the wattage consumption of the plurality of air conditioners 50.
  • That is, the demand control unit 20 may switch off the outdoor units 51 of the air conditioners so that the operation mode of the indoor unit 52 in a corresponding area may be changed into a blowing (fan only) mode for reducing the wattage consumption of the air conditioners 50.
  • Meanwhile, when changing the operation mode of the air conditioners 50, the demand control unit 20 may change the operation mode of the indoor units 52 into the blowing (fan only) mode by switching off the outdoor unit 51, and also into another operation mode that can reduce the power consumption by changing into a dehumidifying mode, changing a blowing amount, controlling a circulation speed of a refrigerant, or the like.
  • As such, changing the operation mode of the air conditioners 50 for reducing the wattage consumption can prevent the temperature in each area from suddenly being changed, comparing with abruptly shutting off the electrical power supply for the air conditioners 50, and accordingly a user in the area where the forcibly controlled air conditioner 50 is located may feel comfortable for a longer time. Also, the time taken until the air conditioner 50 is restored from the forcibly controlled temperature to the prior temperature is shortened, thereby preventing unnecessary energy consumption.
  • Hereafter, a method for an air conditioner in accordance with the present invention will be described with reference to Figure 2.
  • First, while performing a cooling or a warming operation with respect to a certain area of a building by the plurality of air conditioners 50 disposed in the building, the wattage consumption sensing unit 10 may sense whether the estimated wattage exceeds the pre-set wattage value by calculating the estimated wattage based on the information regarding the consumed wattage measured by the watt-hour meter 71, and then transfer the thusly sensed information to the demand control unit 20 (S1).
  • Here, if the information that the estimated wattage exceeds the set wattage value is transferred to the demand control unit 20 from the wattage consumption sensing unit 10, the demand control unit 2 may select at least one outdoor unit 51 (S2). Here, the forcibly controlled outdoor unit 51 may be excluded. In other words, when the estimated wattage consumption exceeds the set wattage value, the demand control unit 2 changes an operation mode of at least one air conditioner of the plurality of air conditioners. For example, the demand control unit 2 switches the at least one air conditioner into a blowing mode, switches the at least one air conditioner into a dehumidifying mode, changes a blowing amount of the at least one air conditioner, or changes a circulation speed of a refrigerant of the at least one air conditioner
  • And, the selected outdoor unit 51 may be switched off so that the operation mode of the indoor unit(s) 52 connected with the outdoor unit 51 may be changed into the blowing (fan only) mode (S3), As such, the overall wattage consumption of the air conditioners may be reduced resulting from the switching off of the outdoor unit 51.
  • Meanwhile, upon reducing the wattage consumption of the air conditioners 50, the wattage consumption sensing unit 10 may sense the information that the estimated wattage falls short of the set wattage value, and then transfer such sensed information to the demand control unit 20. Then, the demand control unit 20 may change the operation mode of the air conditioners controlled in the previous step into a cooling mode or a warming mode from the blowing mode, so that the operation mode of the air conditioners may be restored to their previous original state (S4).
  • As aforementioned, the demand control system and the demand control method for a multi-type air conditioner in accordance with the present invention operates to control the operational efficiency of the air conditioners by changing the operation mode of the air conditioners so as to reduce the wattage consumption of the air conditioners when the estimated wattage consumption exceeds a set wattage value, thereby enabling a user in the area where the controlled air conditioner is located to feel comfortable pleasant for a longer time.
  • Further, the time taken until the air conditioner is restored from the forcibly controlled temperature to the prior desired temperature is shortened, thereby preventing unnecessary energy consumption.

Claims (10)

  1. A demand control system for a multi-type air conditioner, comprising:
    a watt-hour meter (71) connected with a plurality of air conditioners of a building and configured to measure a wattage consumption value of the plurality of air conditioners;
    characterized in that:
    the demand control system further comprises
    a wattage consumption sensing unit (10) configured to calculate an estimated wattage consumption of a plurality of air conditioners of a building after a certain time duration based on the wattage consumption measured by the watt-hour meter (71) and further configured to compare the estimated wattage consumption with a pre-set demand wattage consumption; and
    a demand control unit (20) for changing an operation mode of at least one air conditioner and a circulation speed of a refrigerant of at least one air conditioner of the plurality of air conditioners when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption exceeds the pre-set demand wattage consumption value.
  2. The system of claim 1, wherein the demand control unit further switches at least one air conditioner into a blowing mode when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption exceeds the pre-set demand wattage consumption value.
  3. The system of claim 1, wherein the demand control unit further switches at least one air conditioner into a dehumidifying mode when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption exceeds the pre-set demand of wattage consumption value.
  4. The system of claim 1, wherein the demand control unit further changes a blowing amount of at least one air conditioner when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption exceeds the pre-set demand wattage consumption value.
  5. The system of claim 1, wherein the demand control unit restores the operation mode of the at least one air conditioner when the wattage consumption sensing unit notifies the demand control unit that the estimated wattage consumption is less than the pre-set demand wattage consumption value.
  6. A method for controlling an air conditioner, comprising:
    measuring a wattage consumption of a plurality of air conditioners;
    calculating an estimated wattage consumption of a plurality of air conditioners of a building after a certain time duration;
    comparing the estimated wattage consumption with a pre-set demand wattage consumption value;
    changing an operation mode of at least one air conditioner, and
    changing a circulation speed of a refrigerant of at least one air conditioner of the plurality of air conditioners when the the estimated wattage consumption exceeds the pre-set demand wattage consumption value.
  7. The method of claim 6, wherein changing the operation mode further comprises switching at least one air conditioner into a blowing mode.
  8. The method of claim 6, wherein changing the operation mode further comprises switching at least one air conditioner into a dehumidifying mode.
  9. The method of claim 6, wherein changing the operation mode further comprises changing a blowing amount of at least one air conditioner.
  10. The method of claim 6, further comprising restoring the operation mode of the at least one air conditioner when the estimated wattage consumption is less than the pre-set demand wattage consumption value.
EP08150528.1A 2007-01-26 2008-01-23 Demand control system and method for multi-type air conditioner Not-in-force EP1953473B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070008569A KR20080070438A (en) 2007-01-26 2007-01-26 Demand control system and demand control method of multi air conditioner

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Publication Number Publication Date
EP1953473A1 EP1953473A1 (en) 2008-08-06
EP1953473B1 true EP1953473B1 (en) 2017-07-12

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EP (1) EP1953473B1 (en)
KR (1) KR20080070438A (en)
CN (1) CN101231020A (en)

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US8290628B2 (en) * 2010-07-23 2012-10-16 Lg Electronics Inc. Air conditioner and method for controlling the same
DE102010052699A1 (en) * 2010-11-26 2012-05-31 Liebherr-Hausgeräte Ochsenhausen GmbH Method for operating a refrigerator and / or freezer and refrigerator and / or freezer
FR2976654B1 (en) * 2011-06-15 2013-07-12 Voltalis DEVICE FOR HEATING, VENTILATION AND / OR AIR CONDITIONING WITH TARGETED FEED MANAGEMENT.
JP6247990B2 (en) * 2014-04-16 2017-12-13 株式会社日立製作所 Air conditioning equipment management system
ES2976235T3 (en) * 2020-06-18 2024-07-29 Mitsubishi Electric Corp Air conditioning system and method for controlling the amount of power of the air conditioning system

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US20050097902A1 (en) * 2003-11-11 2005-05-12 Lg Electronics Inc. Central control system of air conditioners and method for operating the same
EP1698835A1 (en) * 2005-02-25 2006-09-06 LG Electronics, Inc. Central control system and control method thereof for multi-unit air conditioners

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US20080178622A1 (en) 2008-07-31
CN101231020A (en) 2008-07-30
EP1953473A1 (en) 2008-08-06
KR20080070438A (en) 2008-07-30

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