CN111678240A - Operation control method of air conditioner, air conditioner and readable storage medium - Google Patents

Operation control method of air conditioner, air conditioner and readable storage medium Download PDF

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Publication number
CN111678240A
CN111678240A CN202010559573.3A CN202010559573A CN111678240A CN 111678240 A CN111678240 A CN 111678240A CN 202010559573 A CN202010559573 A CN 202010559573A CN 111678240 A CN111678240 A CN 111678240A
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air conditioning
pressure value
frequency
compressor
conditioning equipment
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CN202010559573.3A
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CN111678240B (en
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杨志华
曾远航
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Chongqing Midea General Refrigeration Equipment Co Ltd
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Chongqing Midea General Refrigeration Equipment Co Ltd
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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • F24F11/70—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
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • 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
    • F24F2140/10—Pressure
    • 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
    • F24F2140/20—Heat-exchange fluid temperature

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

Abstract

The invention provides an operation control method of air conditioning equipment, the air conditioning equipment and a readable storage medium, wherein the operation control method of the air conditioning equipment comprises the following steps: in response to a starting instruction, acquiring a chilled water temperature and a cooling water temperature of the air conditioning equipment; determining a target starting frequency according to the temperature of the chilled water and the temperature of the cooling water; and controlling a compressor of the air conditioning equipment to start running at the target starting frequency. By applying the technical scheme provided by the invention, when the air-conditioning equipment is controlled to start, the target starting frequency of the compressor during starting is determined according to the real-time chilled water temperature and the cooling water temperature, so that the starting frequency of the compressor of the air-conditioning equipment is matched with the actual working condition of the compressor, on one hand, the starting surge caused by different working conditions can be effectively avoided, on the other hand, the operating frequency of the air-conditioning equipment can be quickly increased, the time required for reaching the rated refrigerating capacity is reduced, and the operating efficiency of the air-conditioning equipment is improved.

Description

Operation control method of air conditioner, air conditioner and readable storage medium
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an operation control method of the air conditioning equipment, the air conditioning equipment and a computer readable storage medium.
Background
In the related art, when an air conditioning device with a variable-frequency centrifugal chiller is started, a fixed starting frequency is generally preset, and after a compressor is controlled to operate to the fixed starting frequency, the starting frequency is adjusted according to an operation condition.
In some cases, for example, when the temperature of the cooling water is higher than that of the freezing water, if the compressor is started at a fixed low starting frequency, a surge risk is generated, and meanwhile, the compressor can reach the rated cooling capacity after the compressor needs to be frequency-increased for a long time, so that the operation efficiency is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention proposes an operation control method of an air conditioning apparatus.
A second aspect of the present invention proposes an air conditioning apparatus.
A third aspect of the invention proposes a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides an operation control method of an air conditioning apparatus, including: in response to a starting instruction, acquiring a chilled water temperature and a cooling water temperature of the air conditioning equipment; determining a target starting frequency according to the temperature of the chilled water and the temperature of the cooling water; and controlling a compressor of the air conditioning equipment to start running at the target starting frequency.
In the technical scheme, when the air conditioning equipment receives a starting instruction and the system starts to operate, the freezing water temperature and the cooling water temperature of the air conditioning equipment are firstly obtained, the target starting frequency matched with the current system working condition is calculated and determined according to the real-time freezing water temperature and the cooling water temperature, and the compressor of the air conditioning equipment is controlled to start to operate at the target starting frequency.
By applying the technical scheme provided by the invention, when the air-conditioning equipment is controlled to start, the target starting frequency of the compressor during starting is determined according to the real-time chilled water temperature and the cooling water temperature, so that the starting frequency of the compressor of the air-conditioning equipment is matched with the actual working condition of the compressor, on one hand, the starting surge caused by different working conditions can be effectively avoided, on the other hand, the operating frequency of the air-conditioning equipment can be quickly increased, the time required for reaching the rated refrigerating capacity is reduced, and the operating efficiency of the air-conditioning equipment is improved.
In addition, the operation control method in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, the air conditioning equipment includes a condenser and an evaporator, and the step of determining the target starting frequency according to the chilled water temperature and the cooling water temperature specifically includes: determining a high pressure value corresponding to the condenser according to the temperature of the cooling water, and determining a low pressure value corresponding to the evaporator according to the temperature of the chilled water; and determining a target starting frequency according to the high-pressure value and the low-pressure value.
In the technical scheme, the high-pressure value corresponding to the condenser can be determined according to the temperature of cooling water, and the low-pressure value corresponding to the evaporator can be determined according to the temperature of chilled water. The high pressure value is a refrigerant saturation pressure value corresponding to the temperature of cooling water, and the low pressure value is a refrigerant saturation pressure value corresponding to the temperature of freezing water.
The system pressure difference and the starting pressure ratio of the compressor during starting can be obtained according to the high pressure value and the low pressure value, the target starting frequency corresponding to the current operating condition is accurately determined, and the operating efficiency of the air conditioning equipment is improved on the premise of avoiding system starting surge.
In any of the above technical solutions, the step of determining the target starting frequency according to the high pressure value and the low pressure value specifically includes: and calculating the ratio of the high-pressure value to the low-pressure value, and calculating the target starting frequency according to the ratio.
In the technical scheme, the ratio of the high pressure value to the low pressure value is calculated, and when the ratio system is started, the starting pressure ratio of the compressor is calculated. According to the starting pressure ratio of the compressor, the corresponding target starting frequency under the current working condition can be determined through function calculation, and then the compressor is controlled to start working at the target starting frequency, so that starting surge can be effectively avoided, and meanwhile, the operating efficiency of the air conditioning equipment is improved.
In any of the above technical solutions, the target starting frequency is calculated by the following formula:
fs＝f()＝a+b+c2+d3；
wherein fs is the target start-up frequency, is the ratio, and a, b, c, and d are constants.
In the technical scheme, the target starting frequency fs is related to a refrigerant saturation pressure value, namely a high pressure value, corresponding to the temperature of cooling water, and a ratio of the refrigerant saturation pressure value, namely a low pressure value, corresponding to the temperature of chilled water, namely a starting pressure ratio of a compressor. And a unitary cubic equation is formed by presetting constants a, b, c and d and the ratio, and the target starting frequency is obtained through calculation.
The preset constants a, b, c and d can be set empirically or calculated according to specific hardware parameters of the system.
In any of the above technical solutions, the step of determining the high pressure value according to the temperature of the cooling water specifically includes: according to the temperature of the cooling water, acquiring a high pressure value corresponding to the temperature of the cooling water in a preset comparison table; the step of determining the low pressure value according to the temperature of the chilled water specifically comprises the following steps: and acquiring a low pressure value corresponding to the temperature of the chilled water in a preset comparison table according to the temperature of the chilled water.
In the technical scheme, the high-pressure value is the refrigerant saturation pressure value corresponding to the temperature of the cooling water, and the low-pressure value is the refrigerant saturation pressure value corresponding to the temperature of the chilled water. After the temperature of the cooling water and the temperature of the cooling water are obtained, the high-pressure value and the low-pressure value of the corresponding system can be determined through table look-up operation, so that the calculated pressure is reduced, the system resources are saved, and the operating efficiency of the air conditioning equipment is improved.
In any of the above technical solutions, after the step of controlling the compressor of the air conditioning equipment to start operating at the target starting frequency, the control method further includes: calculating the ratio of the high pressure value to the low pressure value, and determining the corresponding surge frequency according to the ratio; acquiring the real-time running frequency of the compressor; and controlling the compressor to increase the operating frequency based on the condition that the real-time operating frequency is less than the surge frequency until the real-time operating frequency is greater than or equal to the surge frequency.
According to the technical scheme, after the air conditioning equipment is started and normally operates, the ratio of the high-pressure value to the low-pressure value is calculated in real time, namely the system pressure difference is determined, and the surge frequency corresponding to the current system working condition is further determined according to the system pressure difference. If the real-time running frequency of the compressor is less than the surge frequency, the system can generate surge, and at the moment, the compressor is controlled to increase the running frequency value to be greater than or equal to the surge frequency, so that the system surge is avoided, and the running effect of the air conditioning equipment is improved.
A second aspect of the present invention provides an air conditioning apparatus comprising an evaporator; a condenser; the first temperature measuring piece is arranged on a chilled water outlet pipeline of the evaporator and is configured to obtain the temperature of chilled water of the air conditioning equipment; the second temperature measuring part is arranged on a cooling water outlet pipeline of the condenser and is configured to obtain the temperature of cooling water of the air conditioning equipment; a memory having stored thereon a computer program; a processor configured to execute a computer program to implement the operation control method of the air conditioning apparatus provided in any one of the above-described technical solutions.
In the technical scheme, the air conditioning equipment comprises an evaporator, a condenser, a first temperature measuring piece arranged on a chilled water outlet pipeline of the evaporator and a second temperature measuring piece arranged on a cooling water outlet pipeline of the condenser. The temperature of the freezing water and the temperature of the cooling water are obtained in real time through the first temperature measurement part and the second temperature measurement part, then the target starting frequency matched with the working condition of the current system is calculated and determined according to the real-time temperature of the freezing water and the temperature of the cooling water, and the compressor of the air conditioning equipment is controlled to start to operate at the target starting frequency.
In the above technical solution, the air conditioning apparatus further includes: the first pressure detection piece is arranged on the evaporator and is configured to detect the evaporation pressure of the air conditioning equipment; and the second pressure detection piece is arranged on the condenser and is configured to detect the condensing pressure of the air conditioning equipment.
In this technical scheme, air conditioning equipment is including setting up in the first pressure detection spare of evaporimeter to and set up in the second pressure detection spare of condenser. The evaporation pressure and the condensation pressure of the air conditioning equipment are detected through the first pressure detection part and the second pressure detection part, and then specific operation parameters of the air conditioning equipment are adjusted, so that the operation safety and the stability of the air conditioning equipment are ensured on the one hand, the operation of an air conditioner is adjusted according to the real-time working condition of the air conditioning equipment on the other hand, and the operation efficiency of the air conditioning equipment is improved.
In any one of the above technical solutions, the air conditioning apparatus further includes: a compressor; a throttle member; the first end of the first flow path is connected with the evaporator, the second end of the first flow path is connected with the condenser, and the compressor is arranged on the first flow path; and a first end of the second flow path is connected with the evaporator, a second end of the second flow path is connected with the condenser, and the throttling element is arranged on the second flow path.
In this solution, the air conditioning apparatus further comprises a compression and throttle member. The compressor is connected with the evaporator and the condenser through the first flow path, and meanwhile, the evaporator and the condenser are connected through the second flow path, and the second flow path is provided with a throttling piece for controlling the flow rate and the flow speed of the refrigerant on the second flow path. The first flow path and the second flow path form an air conditioning flow path to complete refrigerant circulation in the air conditioning equipment, and refrigeration or heating is further realized through a thermodynamic principle.
In any one of the above technical solutions, the air conditioning apparatus further includes: the valve body is arranged on the first flow path and positioned between the compressor and the condenser; wherein, the valve body is communicated in a one-way from the compressor to the condenser.
In the technical scheme, the one-way valve is arranged between the compressor and the condenser of the air conditioning equipment, so that the refrigerant can only be conducted in one way from the exhaust port of the compressor to the inlet of the condenser, the refrigerant diversion is avoided, and the system stability is improved.
A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the operation control method for an air conditioning device provided in any one of the above technical solutions, and therefore, the computer-readable storage medium includes all the beneficial effects of the operation control method for an air conditioning device provided in any one of the above technical solutions, which are not described herein again.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating an operation control method of an air conditioner according to an embodiment of the present invention;
fig. 2 illustrates another flowchart of an operation control method of an air conditioner according to an embodiment of the present invention;
fig. 3 illustrates still another flowchart of an operation control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is still another flowchart illustrating an operation control method of an air conditioner according to an embodiment of the present invention;
fig. 5 shows a schematic configuration diagram of an air conditioning apparatus according to an embodiment of the present invention;
fig. 6 is still another flowchart illustrating an operation control method of an air conditioner according to an embodiment of the present invention.
Wherein, the corresponding relationship between the reference numbers and the names of the components in fig. 5 is:
500 air conditioning equipment, 502 evaporator, 504 condenser, 506 first temperature measuring piece, 508 second temperature measuring piece, 510 first pressure measuring piece, 512 second pressure measuring piece, 516 compressor, 518 throttle piece, 520 first flow path, 522 second flow path, 524 valve body.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
An operation control method of an air conditioner, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 6.
Example one
As shown in fig. 1, in one embodiment of the present invention, there is provided an operation control method of an air conditioning apparatus, including:
step S102, responding to a starting instruction, and acquiring the temperature of chilled water and the temperature of cooling water of air conditioning equipment;
step S104, determining a target starting frequency according to the temperature of the chilled water and the temperature of the cooling water;
and step S106, controlling the compressor of the air conditioning equipment to start running at the target starting frequency.
In step S102, the start instruction may be a specific electrical control signal sent to the main control system of the air conditioning equipment by a user through operating a remote controller, a control panel, a mobile phone APP (Application), a line control, an integrated switch, an upper computer, and the like, or a control signal automatically generated by the main control system of the air conditioning equipment based on a specific trigger condition, such as that the room temperature reaches a temperature threshold, reaches a preset time, detects an indoor living body signal, triggers a preset scene, and the like.
In step S104, specifically, as shown in fig. 2, the following steps are included:
step S202, determining a high pressure value corresponding to a condenser according to the temperature of cooling water;
step S204, determining a low pressure value corresponding to the evaporator according to the temperature of the chilled water;
and step S206, determining a target starting frequency according to the high-pressure value and the low-pressure value.
In step S202 and step S204, after the chilled water temperature and the chilled water temperature are obtained, the high pressure value and the low pressure value of the corresponding system can be determined through a table look-up operation by using a threshold comparison table, specifically, a comparison table of the chilled water temperature, the chilled water temperature and the corresponding refrigerant saturation pressure value, so as to calculate the pressure, thereby saving system resources and improving the operating efficiency of the air conditioning equipment.
Specifically, step S202 specifically includes: acquiring a high pressure value corresponding to the cooling water temperature in a preset comparison table according to the cooling water temperature, wherein the step S204 specifically comprises the following steps: and acquiring a low pressure value corresponding to the temperature of the chilled water in a preset comparison table according to the temperature of the chilled water.
In other embodiments, the real-time high-pressure value and the real-time low-pressure value may also be directly obtained by setting corresponding pressure sensors, and the air conditioning equipment may be controlled by the obtained real-time parameters.
In step S206, specifically, as shown in fig. 3, the following steps are included:
step S302, calculating the ratio of the high pressure value to the low pressure value;
and step S304, calculating the target starting frequency according to the ratio of the high-pressure value to the low-pressure value.
In step S304, specifically, the target start-up frequency may be calculated by the following formula:
fs＝f()＝a+b+c2+d3；
wherein fs is the target start-up frequency, is the ratio, and a, b, c, and d are constants.
In the embodiment, when the air conditioner receives a starting instruction and the system starts to operate, the freezing water temperature and the cooling water temperature of the air conditioner are firstly obtained, a target starting frequency matched with the current system working condition is calculated and determined according to the real-time freezing water temperature and the cooling water temperature, and the compressor of the air conditioner is controlled to start to operate at the target starting frequency.
The high pressure value corresponding to the condenser can be determined according to the temperature of cooling water, and the low pressure value corresponding to the evaporator can be determined according to the temperature of chilled water. The high pressure value is a refrigerant saturation pressure value corresponding to the temperature of cooling water, and the low pressure value is a refrigerant saturation pressure value corresponding to the temperature of freezing water.
Next, a ratio of the high pressure value to the low pressure value is calculated, which is a start pressure ratio of the compressor at the start of the system. And according to the starting pressure ratio of the compressor, determining the corresponding target starting frequency under the current working condition through function calculation, and further controlling the compressor to start working at the target starting frequency.
After the temperature of the cooling water and the temperature of the cooling water are obtained, the high-pressure value and the low-pressure value of the corresponding system can be determined through table look-up operation, so that the calculated pressure is reduced, the system resources are saved, and the operating efficiency of the air conditioning equipment is improved.
In the above functional formula, specifically, the target start-up frequency fs is related to a ratio of a refrigerant saturation pressure value corresponding to the cooling water temperature, i.e., a high pressure value, to a refrigerant saturation pressure value corresponding to the chilled water temperature, i.e., a low pressure value, i.e., a start-up pressure ratio of the compressor. And a unitary cubic equation is formed by presetting constants a, b, c and d and the ratio, and the target starting frequency is obtained through calculation.
The preset constants a, b, c and d can be set empirically or calculated according to specific hardware parameters of the system.
In the operation process of the air conditioning equipment, the preset constants a, b, c and d can be updated or reset in the modes of external memory input, instruction adjustment and network downloading.
It should be noted that the unitary cubic function formula is not the only function formula of the embodiment of the present invention. The function expresses the positive correlation relationship between the target starting frequency and the compressor starting pressure ratio, and the function formula can be specifically adjusted along with different values of the preset constants a, b, c and d or under the condition that more or less preset constants are set, for example, the function formula can be adjusted to be a unitary quartic function, a unitary quintic function or a logarithmic curve function and the like.
In other embodiments, the target start frequency may be further calculated in detail with reference to the opening degree of an IGV (Intake Guide Vane), so as to obtain a more accurate start control at the expense of increasing the calculation load and the product cost.
It will be appreciated that the above function may be adapted to a function formula such as a bivariate cubic function, a bivariate quartic function, etc., after introducing consideration of the IGV opening degree.
By applying the embodiment provided by the invention, when the air-conditioning equipment is controlled to start, the target starting frequency of the compressor during starting is determined according to the real-time chilled water temperature and the cooling water temperature, so that the starting frequency of the compressor of the air-conditioning equipment is matched with the actual working condition of the compressor, on one hand, the starting surge caused by different working conditions can be effectively avoided, on the other hand, the operating frequency of the air-conditioning equipment can be quickly increased, the time required for reaching the rated refrigerating capacity is reduced, and the operating efficiency of the air-conditioning equipment is improved.
Example two
As shown in fig. 4, in one embodiment of the present invention, an operation control method of an air conditioner includes:
step S402, calculating the ratio of the high pressure value to the low pressure value, and determining the corresponding surge frequency according to the ratio;
step S404, acquiring the real-time running frequency of the compressor;
and step S406, controlling the compressor to increase the operation frequency based on the condition that the real-time operation frequency is less than the surge frequency until the real-time operation frequency is greater than or equal to the surge frequency.
In this embodiment, after the start-up is completed, as the chilled water temperature decreases and the chilled water temperature increases, a system pressure differential Δ p is generated in the unitec＝pc÷peAt this time, the control system of the air conditioning equipment needs to be according to the formula (f)c＝f(Δpec) Wherein f iscFor surge frequency, Δ pecFor system pressure differential) the surge frequency is calculated.
When the current operating frequency of the compressor of the air conditioning apparatus is less than the surge frequency, the operating frequency needs to be raised to avoid the unit surge.
Specifically, after the air conditioning equipment is started and normally operates, the ratio of the high pressure value to the low pressure value is calculated in real time, the system pressure difference can be determined according to the ratio, and the surge frequency corresponding to the current system working condition is further determined according to the system pressure difference. If the real-time running frequency of the compressor is less than the surge frequency, the system can generate surge, and at the moment, the compressor is controlled to increase the running frequency value to be greater than or equal to the surge frequency, so that the system surge is avoided, and the running effect of the air conditioning equipment is improved.
EXAMPLE III
As shown in fig. 5, in one embodiment of the present invention, there is provided an air conditioning apparatus 500 including an evaporator 502; a condenser 504; the first temperature measuring element 506 is arranged on a chilled water outlet pipeline of the evaporator 502, and the first temperature measuring element 506 is configured to obtain the temperature of chilled water of the air-conditioning equipment 500; and a second temperature measuring unit 508 disposed in the cooling water outlet line of the condenser 504, wherein the second temperature measuring unit 508 is configured to obtain a temperature of the cooling water of the air conditioner 500.
A first pressure detecting member 510 provided to the evaporator 502, the first pressure detecting member 510 being configured to detect an evaporation pressure of the air conditioner 500; and a second pressure detecting member 512 disposed at the condenser 504, the second pressure detecting member 512 being configured to detect a condensing pressure of the air conditioner 500.
A compressor 516; a throttle 518; a first flow path 520, a first end of the first flow path 520 being connected to the evaporator 502, a second end of the first flow path 520 being connected to the condenser 504, and the compressor 516 being provided in the first flow path 520; in the second flow path 522, a first end of the second flow path 522 is connected to the evaporator 502, a second end of the second flow path 522 is connected to the condenser 504, and the orifice 518 is provided in the second flow path 522.
A valve body 524 provided on the first flow path 520 between the compressor 516 and the condenser 504; wherein valve body 524 is in one-way communication in the direction from compressor 516 to condenser 504.
Meanwhile, the air conditioner 500 further includes a memory on which a computer program is stored and a processor configured to implement the operation control method of the air conditioner 500 provided in the above-described embodiments when the computer program is executed.
In this embodiment, the air conditioner 500 includes an evaporator 502, a condenser 504, a first temperature measuring device 506 disposed on the outlet pipeline of the chilled water from the evaporator 502, and a second temperature measuring device 508 disposed on the outlet pipeline of the cooling water from the condenser 504. The freezing water temperature and the cooling water temperature are obtained in real time through the first temperature measuring part 506 and the second temperature measuring part 508, a target starting frequency matched with the current system working condition is calculated and determined according to the real-time freezing water temperature and the cooling water temperature, and the compressor 516 of the air conditioning equipment 500 is controlled to start to operate at the target starting frequency.
The air conditioner 500 includes a first pressure detecting member 510 provided to the evaporator 502, and a second pressure detecting member 512 provided to the condenser 504. The evaporation pressure and the condensation pressure of the air conditioning equipment 500 are detected through the first pressure detection part 510 and the second pressure detection part 512, and then specific operation parameters of the air conditioning equipment 500 are adjusted, so that the operation safety and the stability of the air conditioning equipment 500 are ensured on the one hand, the operation of an air conditioner is adjusted according to the real-time working condition of the air conditioning equipment 500 on the one hand, and the operation efficiency of the air conditioning equipment 500 is improved.
The air conditioning apparatus 500 further includes a compression and throttle member 518. The compressor 516 is connected to the evaporator 502 and the condenser 504 through a first flow path 520, and the evaporator 502 and the condenser 504 are connected through a second flow path 522, and a throttle 518 is provided in the second flow path 522 to control a flow rate and a flow rate of a refrigerant in the second flow path 522. The first flow path 520 and the second flow path 522 form an air conditioning flow path to complete a refrigerant cycle in the air conditioning equipment 500, thereby implementing cooling or heating by a thermodynamic principle.
A check valve is arranged between the compressor 516 and the condenser 504 of the air conditioning equipment 500, so that the refrigerant can only be conducted in a one-way direction from the exhaust port of the compressor 516 to the inlet of the condenser 504, the refrigerant diversion is avoided, and the system stability is improved.
The air conditioning equipment 500 provided by the embodiment of the invention can effectively avoid the starting surge caused by different working conditions on one hand, and can quickly improve the running frequency of the air conditioning equipment 500 on the other hand, reduce the time required for reaching the rated refrigerating capacity and improve the running efficiency of the air conditioning equipment 500 on the other hand.
Meanwhile, the air conditioner 500 can implement the operation control method of the air conditioner 500 provided in the above embodiments by executing the computer program stored in the memory through the processor, and therefore, the air conditioner 500 also includes all the beneficial effects of the operation control method of the air conditioner 500 provided in any of the above embodiments, which are not described herein again.
Example four
In an embodiment of the present invention, an air conditioner as shown in fig. 5 is taken as an example to specifically describe the embodiment of the present invention.
For the frequency conversion centrifugal water chilling unit, if the starting frequency (f) is set to be fixed0) To control the start of the compressor, after the start is finished, because of the temperature t of the chilled watereoLowering and cooling the water temperature tcoWhen the pressure rises, a system pressure difference (delta p) is generated in the unitec＝pc-pe) While controlling the host computer according to the formula (f)c＝f(Δpec) Wherein f iscFor surge frequency, Δ pecFor system pressure differential) to avoid unit surge due to compressor frequency being lower than surge frequency.
In the above process, if the unitCooling water temperature t in standby statecoFreezing water temperature teoIf the compressor is still at a fixed starting frequency (f)0) The operation is started even at the boost frequency (to f) since the start-up frequency is generally set lower1) Then, it remains at the surge frequency fcThere is also a risk of surge occurring. And because the starting frequency is low, the device needs to wait for a long time before loading the rated cold quantity.
Meanwhile, if the exhaust port of the compressor is provided with the check valve, the unit generates extra pressure loss delta p after operation due to the influence of the check valve0While the compressor is at a fixed frequency f0After starting up, the system pressure difference delta p is already high due to the fact that the cooling water temperature is highecWill rapidly increase to a greater value, and therefore if the energy produced by the compressor is insufficient to overcome the system pressure differential apecAnd pressure loss Δ p of check valve0The compressor air displacement is maintained in a low range, the one-way valve cannot be normally opened, the unit rapidly enters a surge state, the condenser heat load is relatively small due to the small compressor air displacement, the condensing pressure cannot be increased, the unit is caused to maintain the surge state for a long time, and finally the operation effect is poor.
In order to overcome the problems caused by adopting a fixed starting frequency, the embodiment of the invention is based on the real-time freezing water temperature t when the air conditioning equipment system is startedeoAnd real-time cooling water temperature tcoCalculating a target start-up frequency fsAnd the target starting frequency during system starting is matched with the real-time working condition of the equipment.
When the cooling water temperature of the unit is higher than the freezing water temperature in the standby state, the corresponding starting frequency fsThe working capacity of the compressor is increased, the compressor applies more work to the refrigerant gas at the moment, the refrigerant flow is also larger, the surge can be effectively avoided, and the rated cold capacity can be achieved more quickly.
Wherein, the starting process is shown in fig. 6:
step S602, responding to a starting instruction;
step S604, the control system calculates the dynamic target starting frequency fs；
Step S606, controlling the compressor to start and adjusting the frequency of the compressor to fs；
And step S608, finishing the starting.
Wherein the condenser high pressure value pcs＝psat(tco) Namely, the high pressure value is equal to the refrigerant saturation pressure value corresponding to the cooling water outlet temperature.
Low pressure value p of evaporatores＝psat(teo) I.e. the low pressure value is equal to the refrigerant saturation pressure value corresponding to the temperature of the frozen effluent.
Starting pressure ratio p of compressorcs÷pesThe target start-up frequency fs () is a + b + c2+d3。
Wherein p iscsFor high pressure values, p, corresponding to the condenseresLow pressure value, t, corresponding to evaporatorcoFor cooling the water temperature, teoFs is the target start-up frequency for chilled water temperature, and a, b, c, and d are constants for compressor start-up pressure ratio.
According to the embodiment of the invention, the target starting frequency of the compressor is dynamically adjusted according to the real-time chilled water temperature and cooling water temperature when the air conditioning equipment is started, the recording time of a unit can be shortened, the rated cold quantity can be quickly loaded, and the surge of the compressor can be avoided.
EXAMPLE five
In an embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program, when executed by a processor, implements the operation control method of the air conditioning equipment provided in any one of the above embodiments, and therefore, the computer-readable storage medium includes all the beneficial effects of the operation control method of the air conditioning equipment provided in any one of the above embodiments, and is not described herein again.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. An operation control method of an air conditioning apparatus, characterized by comprising:
acquiring a chilled water temperature and a cooling water temperature of the air conditioning equipment in response to a starting instruction;
determining a target starting frequency according to the chilled water temperature and the cooling water temperature;
and controlling a compressor of the air conditioning equipment to start running at the target starting frequency.
2. The operation control method of an air conditioning apparatus according to claim 1, wherein the air conditioning apparatus includes a condenser and an evaporator, and the step of determining a target start-up frequency from the chilled water temperature and the cooling water temperature specifically includes:
determining a high pressure value corresponding to the condenser according to the temperature of the cooling water, and determining a low pressure value corresponding to the evaporator according to the temperature of the chilled water;
and determining the target starting frequency according to the high pressure value and the low pressure value.
3. The operation control method of the air conditioning equipment according to claim 2, wherein the step of determining the target starting frequency according to the high pressure value and the low pressure value specifically comprises:
and calculating the ratio of the high pressure value to the low pressure value, and calculating the target starting frequency according to the ratio.
4. The operation control method of an air conditioning apparatus according to claim 3, characterized in that the target starting frequency is calculated by the following formula:
fs＝f()＝a+b+c2+d3；
wherein fs is the target start-up frequency, is the ratio, and a, b, c, and d are constants.
5. The operation control method of an air conditioning apparatus according to claim 2, wherein the step of determining the high pressure value according to the cooling water temperature specifically includes:
acquiring the high-pressure value corresponding to the cooling water temperature in a preset comparison table according to the cooling water temperature;
the step of determining the low pressure value according to the chilled water temperature specifically includes:
and acquiring the low-pressure value corresponding to the chilled water temperature in the preset comparison table according to the chilled water temperature.
6. The operation control method of an air conditioning apparatus according to any one of claims 2 to 5, characterized in that after the step of controlling the compressor of the air conditioning apparatus to start operating at the target starting frequency, the control method further comprises:
calculating the ratio of the high pressure value to the low pressure value, and determining the corresponding surge frequency according to the ratio;
acquiring the real-time running frequency of the compressor;
and controlling the compressor to increase the operating frequency based on the condition that the real-time operating frequency is less than the surge frequency until the real-time operating frequency is greater than or equal to the surge frequency.
7. An air conditioning apparatus, characterized by comprising:
an evaporator;
a condenser; and
the first temperature measuring piece is arranged on a chilled water outlet pipeline of the evaporator and is configured to obtain the temperature of chilled water of the air conditioning equipment;
the second temperature measuring part is arranged on a cooling water outlet pipeline of the condenser and is configured to obtain the temperature of cooling water of the air conditioning equipment;
a memory having stored thereon a computer program;
a processor configured to execute the computer program to implement the operation control method of the air conditioning apparatus according to any one of claims 1 to 6.
8. The air conditioning apparatus as claimed in claim 7, further comprising:
a first pressure detecting member provided to the evaporator, the first pressure detecting member being configured to detect an evaporation pressure of the air conditioning equipment;
and a second pressure detecting member provided to the condenser, the second pressure detecting member being configured to detect a condensing pressure of the air conditioning apparatus.
9. The air conditioning apparatus as claimed in claim 7, further comprising:
a compressor;
a throttle member; and
a first flow path having a first end connected to the evaporator and a second end connected to the condenser, the compressor being disposed on the first flow path;
and a second flow path, a first end of which is connected to the evaporator, a second end of which is connected to the condenser, and the throttle member is disposed on the second flow path.
10. The air conditioning apparatus as claimed in claim 9, further comprising:
a valve body disposed on the first flow path between the compressor and the condenser;
wherein, the valve body is communicated in a one-way direction from the compressor to the condenser.
11. A computer-readable storage medium on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements an operation control method of an air conditioning apparatus according to any one of claims 1 to 6.
CN202010559573.3A 2020-06-18 2020-06-18 Operation control method of air conditioner, air conditioner and readable storage medium Active CN111678240B (en)

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