WO2021135677A1 - Procédé de commande pour commuter automatiquement le mode de fonctionnement d'une unité de refroidissement d'eau - Google Patents

Procédé de commande pour commuter automatiquement le mode de fonctionnement d'une unité de refroidissement d'eau Download PDF

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Publication number
WO2021135677A1
WO2021135677A1 PCT/CN2020/128701 CN2020128701W WO2021135677A1 WO 2021135677 A1 WO2021135677 A1 WO 2021135677A1 CN 2020128701 W CN2020128701 W CN 2020128701W WO 2021135677 A1 WO2021135677 A1 WO 2021135677A1
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Prior art keywords
mode
chiller
water
control method
setting value
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PCT/CN2020/128701
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English (en)
Chinese (zh)
Inventor
丁善达
陶慧汇
孙辉
牛晓燕
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青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021135677A1 publication Critical patent/WO2021135677A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • F24F11/64—Electronic processing using pre-stored 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
    • 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
    • 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
    • F24F11/67—Switching between heating and cooling modes
    • 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
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits

Definitions

  • the present invention relates to a method for controlling an air conditioning system, in particular to a control method for automatically switching the operation mode of a chiller.
  • Water chillers generally conduct heat through water (called refrigerant), including but not limited to water-cooled chillers and air-cooled chillers.
  • the chiller can adopt a vapor compression refrigeration cycle (for example, using a screw compressor or a scroll compressor) or an absorption refrigeration cycle.
  • the chiller using the vapor compression refrigeration cycle first uses a refrigerant (such as Freon or other substitutes) to cool (refrigerate) or heat (heat) the water to a certain temperature (called “outlet water temperature” or “water supply temperature”);
  • a refrigerant such as Freon or other substitutes
  • the cooled or heated water is then sent to the heat exchange coil of the central air conditioning system to cool or warm the air;
  • the cooled or warmed air is then sent to the space that needs cooling or heating (conditioned space), such as an office Etc.; the water that transfers heat to the air is heated or cooled to a certain temperature (called “return water temperature”) and then returned to the chiller to be cooled or heated again, thereby starting a new cooling or heating cycle.
  • Water chillers have been widely used at present, for example, they have developed into a type of central air-conditioning. At the same time, the various functions of the chiller have been gradually improved. For example, the same chiller can meet multiple requirements for refrigeration, heating, hot water production and heat recovery.
  • the user selects different functional modes through the remote control or the buttons on the user terminal. For example, when the user needs cooling, the cooling mode is selected; when the user needs hot water, the hot water heating mode is selected; when both cooling and cooling are required When making hot water, select the heat recovery mode.
  • the selection of these function modes requires the user to operate through the wire controller, so the intelligent control of the unit cannot be realized, and the convenience of operation is not enough.
  • the present invention provides a control method for automatically switching the operation mode of the chiller, the chiller having Multiple operating modes and including a water tank that provides hot water
  • the control method includes: establishing a water temperature setting value and a water tank temperature setting value of the chiller; dividing more based on the water temperature setting value and the water tank temperature setting value A load demand area, and select a corresponding operation mode for each load demand area from the multiple operation modes; measure the actual water temperature and actual water tank temperature of the chiller; based on the measured actual water temperature and actual water tank temperature Select one of the multiple load demand zones, and automatically switch the chiller to the corresponding operation mode according to the selected load demand zone.
  • the control method includes a predetermined value hysteresis control.
  • the predetermined value hysteresis control includes 2 degrees Celsius hysteresis control.
  • the multiple operation modes include a cooling mode, a heating mode, a hot water mode, a heat recovery mode, a heating priority mode, and a standby mode .
  • the control method includes a summer control mode and a winter control mode.
  • the summer control mode the cooling water temperature set value and the first Water tank temperature setting value, and dividing the multiple load demand zones based on the cooling water temperature setting value and the first water tank temperature setting value; in the winter control mode, establishing the heating water temperature setting value and the second The water tank temperature setting value, and the plurality of load demand zones are divided based on the heating water temperature setting value and the second water tank temperature setting value.
  • the set value of the cooling water temperature is 12°C
  • the set value of the hot water temperature is 45°C.
  • the set temperature of the first water tank is 40°C
  • the set temperature of the second water tank is 50°C.
  • the chiller in the summer control mode, includes a cooling mode, a hot water mode, a heat recovery mode, and a standby mode; In the winter control mode, the chiller includes a heating mode, a hot water mode, a heating priority mode, and a standby mode.
  • the summer control mode and the winter control mode can be automatically switched based on the ambient temperature or manually set.
  • the multiple load demand areas include nine load demand areas.
  • a plurality of loads are divided according to the established water temperature setting value of the water chiller and the water tank temperature setting value.
  • Demand area and select a corresponding operating mode for each load demand area.
  • the chiller When the chiller is running or in standby, measure the actual water temperature of the chiller and the actual water tank temperature. Select one of multiple load demand zones based on the measured actual water temperature and actual water tank temperature, and automatically switch the chiller to the corresponding operating mode according to the selected load demand zone.
  • This control method that automatically selects the operating mode of the chiller based on actual load demand changes not only realizes the intelligent control of the chiller, but also further improves the convenience of user operations.
  • the control method of the present invention adopts a predetermined value of hysteresis control, such as 2 degrees Celsius hysteresis control, which can avoid frequent conversion between operating modes caused by fluctuations in the water temperature of the chiller near the critical value and/or frequent startup of the chiller. Stop the problem.
  • hysteresis control such as 2 degrees Celsius hysteresis control
  • the summer control mode and the winter control mode set by the control method of the present invention can respectively meet the main needs of the user in a certain period of time, such as cooling or heating.
  • Figure 1 is a flow chart of the control method for automatically switching the operating mode of the chiller according to the present invention
  • FIG. 2 is a flowchart of an embodiment of the summer control mode of the control method for automatically switching the operation mode of the chiller of the present invention
  • Fig. 3 is a flowchart of an embodiment of the winter control mode of the control method for automatically switching the operation mode of the chiller of the present invention.
  • the present invention provides a control method for automatically switching the operation mode of the water chiller.
  • the chiller has a variety of operating modes and includes a water tank that provides hot water.
  • the control method includes: establishing the water temperature setting value and the water tank temperature setting value of the chiller (step S1); dividing a plurality of load demand areas based on the water temperature setting value and the water tank temperature setting value, and selecting from multiple operation modes Select a corresponding operating mode for each load demand zone (step S2); measure the actual water temperature and actual water tank temperature of the chiller (step S3); select the multiple load requirements based on the measured actual water temperature and actual water tank temperature According to the selected load demand area, the chiller is automatically switched to the corresponding operating mode (step S4).
  • the multiple operation modes include cooling mode, heating mode, hot water heating mode, heat recovery mode, heating priority mode, and standby mode.
  • the "cooling mode” generally refers to an operation mode in which the outdoor air-conditioning unit performs cooling operation and transfers the cold energy to the water system, and then realizes the user's indoor cooling demand through the water system.
  • the “heating mode” usually refers to the operation mode in which the outdoor air-conditioning unit performs heating operation and transfers heat to the water system, and then realizes the heating demand of the user's indoor side through the water system.
  • Hot water mode usually refers to the operation mode in which the outdoor air conditioning unit performs heating operation and transfers the heat to the water system, and then stores the hot water in the water tank to achieve the hot water demand of the user indoors.
  • Heat recovery mode usually means that the outdoor air conditioning unit performs cooling and hot water operation at the same time and transfers the heat emitted by the cooling to the water system on the hot water side, and then the hot water is stored in the water tank to achieve the indoor side of the user.
  • Simultaneous cooling and hot water demand operation mode usually refers to the state where the chiller is energized but stopped.
  • Heating priority mode usually refers to the mode that first meets the heating demand when there are both heating and hot water demand. That is, the chiller has heating priority by default, so the chiller enters the heating mode first.
  • the "set value of water temperature” mentioned in this article generally refers to the set value of the return water temperature of the chiller.
  • the actual water temperature also refers to the actual return water temperature of the chiller.
  • the water temperature set value may also be the set value of the water supply temperature of the chiller. In this case, the actual water temperature should also be the actual water supply temperature.
  • the chillers submitted in this article can be chillers using vapor compression refrigeration cycles (such as screw chillers or scroll chillers), or chillers using absorption refrigeration cycles (such as lithium bromide absorption chillers). Chillers), but not limited to these types of chillers. In addition, these chillers are equipped with water tanks for storing and supplying hot water.
  • Fig. 1 is a flowchart of a control method for automatically switching the operation mode of a chiller according to the present invention.
  • the control method first establishes the water temperature setting value of the chiller and the water tank temperature setting value.
  • the control method divides the user's load demand into multiple load demand areas based on the established water temperature set value and water tank temperature set value, and selects one for each load demand area from multiple operating modes Corresponding operating mode.
  • the chiller is running or on standby, the actual water temperature of the chiller and the actual water tank temperature are measured through step S3.
  • a load demand zone is selected from multiple load demand zones based on the measured actual water temperature and actual water tank temperature, and the chiller is automatically switched to the corresponding operating mode according to the selected load demand zone.
  • the control method of the present invention includes a summer control mode and a winter control mode.
  • the chiller can include cooling mode, hot water mode, heat recovery mode and standby mode, and can automatically switch between these modes based on load demand.
  • the chiller can include heating mode, hot water mode, heating priority mode and standby mode, and can automatically switch between these modes based on load demand.
  • the conversion between the summer control mode and the winter control mode can be automatically switched based on the outside environment temperature or manually set.
  • both the summer control mode and the winter control mode adopt predetermined value hysteresis control.
  • the predetermined value hysteresis control is the hysteresis control for the water temperature setting value and the water tank temperature setting value.
  • the predetermined value may be, for example, 2 degrees Celsius.
  • the predetermined value may also be a predetermined value lower than 2 degrees Celsius or higher than 2 degrees Celsius. This return difference control can increase the stability of the chiller and avoid frequent start and stop of the chiller.
  • the chiller when the chiller does not adopt the differential control, if the water temperature is set to 10°C, then when the water temperature of the chiller is lower than 10°C, the chiller will stop immediately; when the indoor load is high When it is large, the water temperature will quickly rise above 10°C, and the chiller will be turned on immediately, causing frequent start and stop of the chiller.
  • the chiller has a return difference of 2 degrees Celsius
  • the chiller when the water temperature is set to 10°C, the chiller will shut down when the water temperature is lower than 10°C-2°C, that is, 8°C; when the chiller is shut down, the water temperature will change It keeps rising, when it reaches 10°C+2°C, that is, 12°C, the chiller will start. Therefore, the hysteresis control method can effectively reduce the number of start and stop of the chiller, reduce energy consumption, and extend the service life of the corresponding components.
  • Fig. 2 is a flowchart of an embodiment of the summer control mode for automatically switching the operation mode of the chiller according to the present invention.
  • the chiller in the summer control mode, has multiple operation modes: cooling mode, hot water heating mode, heat recovery mode, and standby mode.
  • the control method for automatically switching the operation mode of the chiller first establishes the set value of the chilled water temperature of the chiller and the set value of the first water tank temperature (step S1').
  • step S2' multiple load demand zones are divided based on the cooling water temperature set value and the first water tank temperature set value, and a corresponding operating mode is selected for each load demand zone from the multiple operating modes.
  • step S3 when the chiller is running or on standby, the actual water temperature of the chiller and the actual water tank temperature are measured.
  • step S4 one of the multiple load demand zones is selected based on the measured actual water temperature and the actual water tank temperature, and the chiller is automatically switched to the corresponding operation mode according to the selected load demand zone.
  • nine load demand zones can be divided based on the set value of the cooling water temperature and the set value of the first water tank temperature. For example, as shown in Table 1 below, taking the water temperature of the chiller unit as the ordinate and the water tank temperature as the abscissa, through the first water tank temperature setting value, the cooling water temperature setting value and the return difference of 2 degrees Celsius, the load demand can be calculated Divided into nine load demand areas (form a nine-square grid): A1, A2, A3, B1, B2, B3, C1, C2, C3.
  • the actual water temperature of the chiller when the actual water temperature of the chiller is higher than the cooling water temperature set value +2, and the actual water tank temperature is lower than the first water tank temperature set value -2, the actual load demand will fall into the area of A1. Therefore, the actual water temperature and the actual water tank temperature change represent the actual load demand change, so that the actual load demand falls into different load demand areas.
  • the first water tank temperature setting value may be 40°C
  • the cooling water temperature setting value may be 12°C.
  • the first water tank temperature setting value and the cooling water temperature setting value may also adopt other suitable values respectively.
  • the load demand area is not limited to nine, but can be less than or more than nine according to actual needs.
  • the corresponding operating mode can be selected. For example, as shown in Table 2 below, in the load demand area A1, because the actual water temperature is high and the actual water tank temperature is low, there is a demand for cooling and hot water at the same time, so the heat recovery mode is selected for the A1 area. In other words, when the actual water temperature of the chiller is higher than the cooling water temperature set value +2, and the actual water tank temperature is lower than the first water tank temperature set value-2, the chiller will automatically switch to the heat recovery mode.
  • load demand zones A2 and A3 correspond to cooling modes
  • load demand zones B1 and C1 correspond to hot water mode
  • load demand zones B2, B3, C2, and C3 all correspond to standby mode.
  • Fig. 3 is a flowchart of an embodiment of the winter control mode for automatically switching the operation mode of the chiller according to the present invention.
  • the chiller in the winter control mode, also has multiple operation modes: a heating mode, a hot water mode, a heating priority mode, and a standby mode.
  • the control method for automatically switching the operating mode of the chiller first establishes the hot water temperature setting value of the chiller unit and the second water tank temperature setting value (step S1").
  • step S2 a plurality of load demand areas are divided based on the heating water temperature setting value and the second water tank temperature setting value, and a corresponding operation mode is selected for each load demand area from the plurality of operation modes.
  • step S3 when the chiller is running or on standby, the actual water temperature of the chiller and the actual water tank temperature are measured.
  • step S4 one of multiple load demand zones is selected based on the measured actual water temperature and actual water tank temperature, and the chiller is automatically switched to the corresponding operating mode according to the selected load demand zone.
  • nine load demand zones can also be divided based on the heating water temperature setting value and the second water tank temperature setting value. For example, as shown in Table 3 below, taking the water temperature of the chiller unit as the ordinate and the temperature of the water tank as the abscissa, through the second water tank temperature setting value, the heating water temperature setting value and the return difference of 2 degrees Celsius, you can Load demand is divided into nine load demand areas (form a nine-square grid): A1, A2, A3, B1, B2, B3, C1, C2, C3.
  • the second water tank temperature setting value may be 50°C
  • the hot water temperature setting value may be 45°C.
  • the second water tank temperature setting value and the hot water temperature setting value may also adopt other suitable values, respectively.
  • the corresponding operating mode can also be selected. For example, as shown in Table 4 below, in the load demand zone A1, because the actual water temperature is high and the actual water tank temperature is low, there is no need for heating, but there is a demand for hot water, so the system is selected for zone A1. Hot water mode. In other words, in winter, when the actual water temperature of the chiller is higher than the hot water temperature setting +2, and the actual water tank temperature is lower than the second water tank temperature setting -2, the chiller will automatically switch to the hot water mode. Similarly, the load demand zone B1 also corresponds to the hot water heating mode. Continuing to refer to Table 4, the load demand areas A2, A3, B2, and B3 all correspond to the standby mode, the load demand area C1 corresponds to the heating priority mode, and the load demand areas C2 and C3 both correspond to the heating mode.
  • the control method of the present invention can realize the intelligent operation of the chiller without manual operation of the operation mode conversion, thus effectively improving the convenience of the chiller.
  • the chiller can automatically enter the heat recovery mode (such as full heat recovery), and can also realize the recovery and utilization of the heat emitted by the chiller during cooling, thus reducing the energy consumption of the chiller and realizing the chiller Energy saving.
  • the control method of the present invention effectively avoids the frequent start and stop of the chiller when the water temperature is near the critical value through the hysteresis control, reduces the frequent actions of components, and increases the service life of the chiller.

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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)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un procédé de commande pour commuter automatiquement un mode de fonctionnement d'une unité de refroidissement d'eau. L'unité de refroidissement d'eau présente une pluralité de modes de fonctionnement et comprend un réservoir d'eau pour fournir de l'eau chaude. Le procédé de commande comprend : l'établissement d'une valeur de consigne de température d'eau et d'une valeur de consigne de température de réservoir d'eau de l'unité de refroidissement d'eau ; en fonction de la valeur de consigne de température de l'eau et de la valeur de consigne de température du réservoir d'eau, la division en une pluralité de régions de demande de charge, et la sélection, pour chaque région de demande de charge, d'un mode de fonctionnement correspondant parmi la pluralité de modes de fonctionnement ; la mesure d'une température d'eau réelle et d'une température de réservoir d'eau réelle de l'unité de refroidissement d'eau ; et la sélection de l'une de la pluralité de régions de demande de charge en fonction de la température réelle de l'eau mesurée et de la température réelle du réservoir d'eau, et en fonction de la région de demande de charge sélectionnée, la commutation automatique de l'unité de refroidissement d'eau vers le mode de fonctionnement correspondant. Le procédé de commande pour sélectionner automatiquement le mode de fonctionnement de l'unité de refroidissement d'eau selon un changement de demande de charge réelle non seulement atteint la commande intelligente de l'unité de refroidissement d'eau, mais améliore en outre la commodité d'une opération d'utilisateur.
PCT/CN2020/128701 2019-12-30 2020-11-13 Procédé de commande pour commuter automatiquement le mode de fonctionnement d'une unité de refroidissement d'eau WO2021135677A1 (fr)

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CN201911388853.6A CN113124531A (zh) 2019-12-30 2019-12-30 用于自动切换冷水机组的运行模式的控制方法

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CN114017300A (zh) * 2021-11-12 2022-02-08 广州发展南沙电力有限公司 一种空压机组智能群控方法及系统

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CN113639493A (zh) * 2021-08-13 2021-11-12 广东纽恩泰新能源科技发展有限公司 低温空气源热泵系统的模块控制方法
CN113639493B (zh) * 2021-08-13 2023-04-14 广东纽恩泰新能源科技发展有限公司 低温空气源热泵系统的模块控制方法
CN114017300A (zh) * 2021-11-12 2022-02-08 广州发展南沙电力有限公司 一种空压机组智能群控方法及系统
CN114017300B (zh) * 2021-11-12 2024-04-19 广州发展南沙电力有限公司 一种空压机组智能群控方法及系统

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