WO2022048131A1 - Système de climatisation - Google Patents

Système de climatisation Download PDF

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Publication number
WO2022048131A1
WO2022048131A1 PCT/CN2021/081678 CN2021081678W WO2022048131A1 WO 2022048131 A1 WO2022048131 A1 WO 2022048131A1 CN 2021081678 W CN2021081678 W CN 2021081678W WO 2022048131 A1 WO2022048131 A1 WO 2022048131A1
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WO
WIPO (PCT)
Prior art keywords
compressor
inverter
efficiency
torque
conditioning system
Prior art date
Application number
PCT/CN2021/081678
Other languages
English (en)
Chinese (zh)
Inventor
石靖峰
曹法立
陈强
石磊
路海滨
Original Assignee
青岛海信日立空调系统有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 青岛海信日立空调系统有限公司 filed Critical 青岛海信日立空调系统有限公司
Priority to CN202180032698.3A priority Critical patent/CN115485511A/zh
Publication of WO2022048131A1 publication Critical patent/WO2022048131A1/fr
Priority to US18/116,089 priority patent/US20230261600A1/en

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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
    • F24F11/54—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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F2140/50—Load
    • 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
    • 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 application relates to the technical field of household appliances, and in particular, to an air conditioning system with an online power consumption detection function.
  • the basis of the application of intelligent control technology and Internet technology in the air conditioning system is the online real-time monitoring of its performance.
  • the deficiencies in the actual operation process of the product are found, the main factors leading to the poor performance of the unit are identified, and the direction for the optimal design of product structure and control strategy is pointed out, and the actual operation of the product can be realized. .
  • Embodiments of the present application provide an air conditioning system, including:
  • a processor module which is configured to:
  • the efficiency ⁇ 0 of the inverter is calculated according to the current operating frequency and the current torque.
  • Figure 1 is a schematic diagram of the power consumption circuit of the air-conditioning system
  • FIG. 2 is a schematic block diagram of an air conditioning system provided by some embodiments of the present application.
  • FIG. 3 is a flowchart of the configuration of a processor module of an air conditioning system provided by some embodiments of the present application;
  • Fig. 4 is the corresponding relation function curve of the torque of the compressor and the efficiency of the frequency converter fitted when the compressor is operated at 115 Hz according to the embodiment of the present application;
  • Fig. 5 is the corresponding relation function curve of the torque of the compressor and the efficiency of the frequency converter fitted when the compressor is operated at 110z provided by the embodiment of the present application;
  • FIG. 6 is a configuration flowchart of a processor module of another air conditioning system provided by an embodiment of the present application.
  • I all is the effective current
  • I' is the current of the outdoor measuring point
  • I r is the current of the measuring point
  • PF is the corresponding power factor
  • C 1 to C 5 are fitting coefficients.
  • the air conditioning system of the present embodiment executes the refrigeration cycle of the air conditioner by controlling the compressor, the condenser, the expansion valve and the evaporator through the processor module.
  • the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to air that has been conditioned and heat-exchanged.
  • the compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas.
  • the discharged refrigerant gas flows into the condenser.
  • the condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
  • the expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant.
  • the evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low temperature and low pressure state to the compressor.
  • the evaporator can achieve the cooling effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.
  • the air conditioner regulates the temperature of the indoor space.
  • the outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger
  • the indoor unit of the air conditioner includes the indoor heat exchanger
  • the expansion valve may be provided in the indoor unit or the outdoor unit.
  • Indoor heat exchangers and outdoor heat exchangers are used as condensers or evaporators.
  • the air conditioner is used as a heater in a heating mode
  • the indoor heat exchanger is used as an evaporator
  • the air conditioner is used as a cooler in a cooling mode.
  • the air conditioning system of this embodiment further includes a frequency converter, which controls and adjusts the rotational speed of the compressor in the air conditioner, so that the compressor is always in an optimal rotational speed state, thereby saving the energy consumption of the air conditioner .
  • the basis is the ability to monitor the performance of air-conditioning systems in real time online.
  • the deficiencies in the actual operation process of the product are found, the main factors leading to the poor performance of the unit are identified, and the direction for the optimal design of product structure and control strategy is pointed out, and the actual operation of the product can be realized. .
  • the efficiency of the inverter is calculated according to the torque of the compressor and the operating frequency.
  • the operating frequency is a control output parameter, which is easy to obtain. There is no need to set up additional detection devices, which simplifies the test complexity.
  • the external detection device introduces test error, which improves the detection accuracy of the frequency converter's efficiency.
  • the input power Pr of the inverter can be calculated according to the efficiency ⁇ 0 of the inverter.
  • the input power P r of the inverter can be obtained by calculating the active power or by calculating the apparent power
  • the calculation of the input power P r of the inverter by using the active power is taken as an example for description, including:
  • the input power Pr of the frequency converter is the energy consumption of the compressor and its frequency converter.
  • the torque of the compressor is related to the discharge temperature, discharge pressure, suction temperature and suction pressure of the compressor, and the above parameters can be obtained through the air conditioning system without additional detection devices.
  • the efficiency curve of the inverter in the laboratory that is, the corresponding relationship function between the torque of the compressor and the efficiency of the inverter.
  • the method for obtaining the efficiency ⁇ 0 of the frequency converter in this embodiment is:
  • the compressor is controlled to run at different operating frequencies, and the corresponding relationship functions between the torque of the compressor and the efficiency of the inverter when running at each operating frequency are respectively fitted.
  • each operating frequency corresponds to a corresponding function between the torque of the compressor and the efficiency of the frequency converter.
  • the efficiency of the inverter at different torques and frequencies is experimentally measured, and the formula is fitted. Because the stator and rotor tooling test uses water cooling and air cooling for the inverter at the same time, the test efficiency will be higher than the actual efficiency, and the laboratory experiment will be checked later.
  • the current operating frequency can be obtained directly through the system.
  • the corresponding relationship function is to find out the corresponding relationship functions f 1 (n) and f 2 (n) between the torque of the two compressors adjacent to the current operating frequency and the efficiency of the inverter.
  • the current operating frequency of the compressor does not correspond to the corresponding function between the torque of the compressor and the efficiency of the inverter
  • the current operating frequency of the compressor if it is not located at both ends of the value, it must have two adjacent operating frequencies. frequencies n1 and n2, and the two operating frequencies are respectively fitted with the corresponding relationship functions f 1 (n) and f 2 (n) of the torque of the compressor and the efficiency of the inverter.
  • the current operating frequency of the compressor is at both ends of the value, it has an adjacent operating frequency, and the operating frequency is fitted with a function f 1 (n) corresponding to the torque of the compressor and the efficiency of the inverter.
  • the operation frequency adjacent to the current operation frequency is taken, and the operation frequency is also fitted with the corresponding relationship function between the torque of the compressor and the efficiency of the inverter, which is denoted as f 2 (n).
  • the interpolation calculation ⁇ 0 includes: calculating the efficiency ⁇ 0 of the frequency converter corresponding to the current operating frequency by using the interpolation method according to ⁇ 1 and ⁇ 2 .
  • the change of the efficiency of the inverter can be equivalent to a linear change. That is, in the step of calculating ⁇ 0 by interpolation, the efficiency ⁇ 0 of the frequency converter corresponding to the current operating frequency is calculated according to ⁇ 1 and ⁇ 2 by using a linear interpolation method.
  • Table 1 is the torque-efficiency correspondence table when the operating frequency is 115hz
  • Table 2 is the torque-efficiency correspondence table when the operating frequency is 110hz.
  • the corresponding function between the torque of the compressor and the efficiency of the frequency converter is a quadratic function.
  • the calculation is performed according to the functions of two operating frequencies adjacent to 112 Hz, 115 Hz and 110 Hz.
  • f 1 (n115) is the efficiency of the inverter whose operating frequency is 115Hz; f 2 (n110) is the efficiency of the inverter whose operating frequency is 110 Hz.
  • the value between the two collection points can be obtained by interpolation, which satisfies the following relationship:
  • the calculation method of the torque of the compressor is:
  • Torque of compressor a*(h 1 -h 2 )* ⁇ *Rpm* ⁇ /b/Rpm;
  • ⁇ is the volumetric efficiency of the compressor, which is a fixed value
  • a and b are fitting parameters.
  • the outlet enthalpy value h 1 is calculated from the discharge temperature and discharge pressure of the compressor, and the enthalpy value h 2 is calculated from the suction temperature and suction pressure of the compressor.
  • the method of outputting active power P c of the inverter is:
  • F 2i is the output power factor of the inverter, which can be obtained directly from the inverter.
  • the circuit board of the inverter contains a current sensor, which can collect the output current I of the inverter, and the output voltage U is the output control value, which can be obtained directly.
  • the efficiency ⁇ 0 of the frequency converter is calculated according to the current operating frequency f of the compressor and the current torque n of the compressor.
  • ⁇ 0 a1*f+b1*n+c1*f*n+d1*f ⁇ 2+e1*n ⁇ 2.
  • a1, b1, c1, d1 and e1 are constants, which can be set according to the actual situation.
  • the air conditioning system of this embodiment can also calculate the input power of the inverter by outputting the apparent power S 2i .
  • the processor module of this embodiment is configured as:
  • S 2i is calculated and output by the frequency converter, and ⁇ 0 can be obtained by the solution described in the first embodiment, which will not be repeated here.
  • F 2i is the output power factor of the inverter, which can be obtained directly from the inverter.
  • the efficiency of the inverter is calculated according to the torque of the compressor and the operating frequency.
  • the operating frequency is a control output parameter, which is easy to obtain.
  • the output power factor of the inverter can be directly obtained from the inverter without additional settings.
  • the detection device simplifies the test complexity, and at the same time does not introduce test errors due to external detection devices, thus improving the efficiency and detection accuracy of the frequency converter.
  • This embodiment solves the technical problems that the on-line energy consumption monitoring of the compressor frequency converter needs to set multiple measurement points to collect parameters, resulting in the use of many test devices, complex test solutions, and the introduction of many errors, resulting in low accuracy.
  • the air conditioning system of the present application which calculates the efficiency of the inverter according to the torque and operating frequency of the compressor, without the need to set up external test devices, which simplifies the test complexity and improves the detection accuracy of the inverter's efficiency.

Abstract

L'invention concerne un système de climatisation, comprenant un compresseur et un convertisseur de fréquence, et comprenant en outre : un module de processeur conçu pour acquérir respectivement la fréquence de fonctionnement actuelle du compresseur et le couple actuel du compresseur, et calculer l'efficacité alpha0 du convertisseur de fréquence en fonction de la fréquence de fonctionnement actuelle et du couple actuel.
PCT/CN2021/081678 2020-09-02 2021-03-19 Système de climatisation WO2022048131A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180032698.3A CN115485511A (zh) 2020-09-02 2021-03-19 空调系统
US18/116,089 US20230261600A1 (en) 2020-09-02 2023-03-01 Air conditioner and method for determining energy consumption of air conditioner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010909922.X 2020-09-02
CN202010909922.XA CN112032938B (zh) 2020-09-02 2020-09-02 空调系统

Related Child Applications (1)

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PCT/CN2021/081677 Continuation-In-Part WO2022083055A1 (fr) 2020-09-02 2021-03-19 Système de conversion de fréquence

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CN112032938B (zh) * 2020-09-02 2022-07-08 青岛海信日立空调系统有限公司 空调系统
CN112367003B (zh) * 2020-10-22 2022-06-28 青岛海信日立空调系统有限公司 变频系统

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CN112032938A (zh) 2020-12-04

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