CN111271833A - Air conditioning system, and operation control method and device of air conditioning system - Google Patents

Air conditioning system, and operation control method and device of air conditioning system Download PDF

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Publication number
CN111271833A
CN111271833A CN201811478540.5A CN201811478540A CN111271833A CN 111271833 A CN111271833 A CN 111271833A CN 201811478540 A CN201811478540 A CN 201811478540A CN 111271833 A CN111271833 A CN 111271833A
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CN
China
Prior art keywords
rotating speed
condensing pressure
current
air conditioning
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811478540.5A
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Chinese (zh)
Inventor
郭振江
万积清
位静
马亮
李大红
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Vertiv Tech Co Ltd
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Vertiv Tech Co Ltd
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Priority to CN201811478540.5A priority Critical patent/CN111271833A/en
Publication of CN111271833A publication Critical patent/CN111271833A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46Improving electric energy efficiency or saving
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • F24F2110/12Temperature of the outside air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/10Pressure
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioning system, and an operation control method and device of the air conditioning system, which aim to improve the energy efficiency of the air conditioning system. The air conditioning system comprises a compressor, a condenser, a throttling element and an evaporator which are sequentially connected through pipelines and form closed circulation; further comprising: the pressure detection module is used for detecting the condensation pressure; the temperature detection module is used for detecting the ambient temperature of the position where the condenser is located; the rotating speed detection module is used for detecting the rotating speed of the compressor; the controller is connected with the outdoor fan, the pressure detection module, the temperature detection module and the rotating speed detection module which are arranged at the compressor and the condenser respectively, and is used for: acquiring the current rotating speed of a compressor, the current ambient temperature and the current condensing pressure; determining a target condensing pressure of an air conditioning system when the air conditioning system operates at a current compressor rotating speed at a current ambient temperature; and comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.

Description

Air conditioning system, and operation control method and device of air conditioning system
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air conditioning system and an operation control method and device of the air conditioning system.
Background
In the prior art, when an air conditioning system operates, the condensing pressure of the air conditioning system is generally controlled within a preset target pressure range so as to meet the refrigeration requirement, and the condensing pressure can be adjusted by the rotating speed of an outdoor fan arranged at a condenser. Specifically, when the detected current condensing pressure is less than the lower limit value of the target pressure range, the rotation speed of the outdoor fan is controlled to be decreased, and when the detected current condensing pressure is greater than the upper limit value of the target pressure range, the rotation speed of the outdoor fan is controlled to be increased.
The prior art has the disadvantage that the target pressure range for the condensing pressure is relatively limited, and the above-mentioned solutions do not achieve or approach optimum energy efficiency over the full operating range of the air conditioning system.
Disclosure of Invention
The embodiment of the invention aims to provide an air conditioning system, and an operation control method and device of the air conditioning system, so as to improve the energy efficiency of the air conditioning system.
The air conditioning system provided by the embodiment of the invention comprises a compressor, a condenser, a throttling element and an evaporator which are sequentially connected through pipelines and form closed circulation; further comprising:
the pressure detection module is used for detecting the condensation pressure;
the temperature detection module is used for detecting the ambient temperature of the position where the condenser is located;
the rotating speed detection module is used for detecting the rotating speed of the compressor;
the controller, respectively with compressor, the outdoor fan that condenser department set up, pressure detection module, temperature detection module and rotational speed detection module are connected for: acquiring the current rotating speed of a compressor, the current ambient temperature and the current condensing pressure; determining a target condensing pressure of the air conditioning system when the air conditioning system operates at a current compressor rotation speed at a current ambient temperature; and comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.
In a particular embodiment, the controller is further configured to:
acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of a compressor, the ambient temperature and the target condensation pressure;
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
In a particular embodiment, the controller is further configured to:
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the prestored operational relationship among the compressor rotating speed, the ambient temperature and the target condensing pressure.
In a particular embodiment, the controller is specifically configured to:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling the outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with a pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with a pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to operate within the range from the first rotating speed to the second rotating speed.
In a specific embodiment, the controller is further configured to:
acquiring a rotating speed adjusting range of the outdoor fan;
when the first rotating speed is larger than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and
and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
In a specific embodiment, the controller is further configured to:
after the outdoor fan is controlled to be closed, returning to continue to execute the operation of obtaining the current compressor rotating speed and the current environment temperature; and
and after the outdoor fan is controlled to operate at the highest running rotating speed, returning to continuously obtain the current rotating speed of the compressor and the current ambient temperature.
The ambient temperature and the compressor speed at the position of the condenser both affect the condensing pressure during the operation of the air conditioning system, so that the air conditioning system has a target condensing pressure capable of realizing the optimal energy efficiency when the air conditioning system operates at different ambient temperatures at different compressor speeds. In the scheme of the embodiment of the invention, the target condensing pressure of the air conditioning system is determined when the air conditioning system operates at the current compressor rotating speed at the current environment temperature, and the rotating speed of the outdoor fan is controlled according to the comparison result between the current condensing pressure and the target condensing pressure, so that the current condensing pressure approaches the target condensing pressure more, and the energy efficiency of the air conditioning system under the current operating condition is improved. Compared with the prior art, the scheme has the advantages that the adjustment of the condensing pressure is not limited to a fixed target pressure range any more, and the air conditioning system can realize or approach the optimal energy efficiency under the operation condition when operating at any ambient temperature and at any compressor rotating speed, so that the energy efficiency of the air conditioning system is greatly improved.
Based on the same inventive concept, the embodiment of the invention also provides an operation control method of the air conditioning system, which comprises the following steps:
acquiring the current rotating speed of a compressor, the current ambient temperature and the current condensing pressure;
determining a target condensing pressure of the air conditioning system when the air conditioning system operates at a current compressor rotation speed at a current ambient temperature;
and comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.
In the scheme of the embodiment of the invention, the target condensing pressure of the air conditioning system is determined when the air conditioning system operates at the current compressor rotating speed at the current environment temperature, and the rotating speed of the outdoor fan is controlled according to the comparison result between the current condensing pressure and the target condensing pressure, so that the current condensing pressure approaches the target condensing pressure more, and the energy efficiency of the air conditioning system under the current operating condition is improved. Compared with the prior art, the scheme has the advantages that the adjustment of the condensing pressure is not limited to a fixed target pressure range any more, and the air conditioning system can realize or approach the optimal energy efficiency under the operation condition when operating at any ambient temperature and at any compressor rotating speed, so that the energy efficiency of the air conditioning system is greatly improved.
Based on the same inventive concept, an embodiment of the present invention further provides an operation control device of an air conditioning system, including:
the first acquisition unit is used for acquiring the current rotating speed of the compressor, the current ambient temperature and the current condensing pressure;
a determination unit for determining a target condensing pressure at which the air conditioning system operates at a current compressor rotational speed at a current ambient temperature;
and the control unit is used for comparing the current condensing pressure with the target condensing pressure and controlling the rotating speed of the outdoor fan according to the comparison result.
In the scheme of the embodiment of the invention, the target condensing pressure of the air conditioning system is determined when the air conditioning system operates at the current compressor rotating speed at the current environment temperature, and the rotating speed of the outdoor fan is controlled according to the comparison result between the current condensing pressure and the target condensing pressure, so that the current condensing pressure approaches the target condensing pressure more, and the energy efficiency of the air conditioning system under the current operating condition is improved. Compared with the prior art, the scheme has the advantages that the adjustment of the condensing pressure is not limited to a fixed target pressure range any more, and the air conditioning system can realize or approach the optimal energy efficiency under the operation condition when operating at any ambient temperature and at any compressor rotating speed, so that the energy efficiency of the air conditioning system is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating an operation control method of an air conditioning system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an operation control device of an air conditioning system according to an embodiment of the present invention.
Reference numerals:
10-compressor 20-condenser 30-throttling element 40-evaporator 50-outdoor fan
100-first acquisition unit 200-determination unit 300-control unit
Detailed Description
In order to improve the energy efficiency of an air conditioning system, the embodiment of the invention provides the air conditioning system, and an operation control method and device of the air conditioning system. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
As shown in fig. 1, an air conditioning system according to an embodiment of the present invention includes a compressor 10, a condenser 20, a throttling element 30, and an evaporator 40, which are sequentially connected by pipes to form a closed cycle; further comprising:
the pressure detection module is used for detecting the condensation pressure;
the temperature detection module is used for detecting the ambient temperature of the position where the condenser is located;
the rotating speed detection module is used for detecting the rotating speed of the compressor;
a controller connected to the outdoor fan 50, the pressure detection module, the temperature detection module and the rotation speed detection module respectively, and arranged at the compressor 10 and the condenser 20, for: acquiring the current rotating speed of a compressor, the current ambient temperature and the current condensing pressure; determining a target condensing pressure of an air conditioning system when the air conditioning system operates at a current compressor rotating speed at a current ambient temperature; and comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.
The specific type of the compressor 10 is not limited, and is preferably an inverter compressor; the specific type of the condenser 20 is not limited, and may be, for example, an air-cooled condenser, a plate-type condenser, or a shell-and-tube condenser; the specific type of throttling element 30 is not limited, and is preferably an electronic expansion valve; the specific type of the evaporator 40 is not limited, and may be a finned tube evaporator or a more efficient parallel flow microchannel evaporator, or a plate evaporator, a shell-and-tube evaporator, etc., which will not be described herein. Alternative types of refrigerants in the closed circulation line formed by the compressor 10, the condenser 20, the throttling element 30 and the evaporator 40 include R22, R410A, R407C, R744, R134a, R1234yf, R290 and R600a, etc.
In the embodiment of the present invention, a specific implementation scheme for determining the target condensing pressure when the air conditioning system operates at the current compressor rotation speed at the current ambient temperature is not limited. In a particular embodiment, the controller is further configured to: acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of the compressor, the ambient temperature and the target condensation pressure; and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
The target condensing pressure database may be obtained from measured data from testing an air conditioning system. Specifically, firstly, an ambient temperature change range where a condenser is located and a compressor rotation speed adjustment range are determined, an air conditioning system can be defined to operate at a certain compressor rotation speed within the compressor rotation speed adjustment range as an operating condition at a certain temperature within the ambient temperature change range, then all operating conditions of the air conditioning system are determined, under any operating condition, a condensing pressure and a COP (Coefficient of performance, COP) of the air conditioning system when an outdoor fan operates at different rotation speeds within the rotation speed adjustment range of the air conditioning system are obtained, the condensing pressure corresponding to the highest COP is a target condensing pressure under the operating condition, and finally, all operating conditions and the target condensing pressure corresponding to the operating conditions are stored to form a target condensing pressure database.
In another embodiment of the present invention, the target condensing pressure of the air conditioning system when operating at the current compressor rotation speed at the current ambient temperature may be further determined according to a pre-stored operational relationship among the compressor rotation speed, the ambient temperature, and the target condensing pressure. In this embodiment, the target condensing pressure of the air conditioning system under all the operating conditions may also be determined according to the above test method, except that after the test result is obtained, the functional operation relationship of the target condensing pressure with respect to the ambient temperature and the rotational speed of the compressor is obtained according to the data fitting method, and then the target condensing pressure at different ambient temperatures and at different rotational speeds of the compressor is obtained according to the operation relationship.
The ambient temperature and the compressor speed at the position of the condenser both affect the condensing pressure during the operation of the air conditioning system, so that the air conditioning system has a target condensing pressure capable of realizing the optimal energy efficiency when the air conditioning system operates at different ambient temperatures at different compressor speeds. In the scheme of the embodiment of the invention, the target condensing pressure of the air conditioning system is determined when the air conditioning system operates at the current compressor rotating speed at the current environment temperature, and the rotating speed of the outdoor fan is controlled according to the comparison result between the current condensing pressure and the target condensing pressure, so that the current condensing pressure approaches the target condensing pressure more, and the energy efficiency of the air conditioning system under the current operating condition is improved. Compared with the prior art, the scheme has the advantages that the adjustment of the condensing pressure is not limited to a fixed target pressure range any more, and the air conditioning system can realize or approach the optimal energy efficiency under the operation condition when operating at any ambient temperature and at any compressor rotating speed, so that the energy efficiency of the air conditioning system is greatly improved.
In an embodiment of the present invention, the controller is specifically configured to:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling an outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with the pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with the pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to the range from the first rotating speed to the second rotating speed for operation.
The corresponding relation between the condensing pressure and the rotating speed of the outdoor fan can be a function operation relation pre-stored in the controller or a mapping relation based on a database, and the rotating speed of the outdoor fan corresponding to the required condensing pressure can be obtained according to the corresponding relation. The scheme of the embodiment is actually the target condensing pressure PobjA safety return difference delta is set, and the current condensing pressure PconSatisfy Pobj-Δ≤Pcon≤Pobj+ Δ, the air conditioning system can be made to approach the optimum energy efficiency under this operating condition, that is, when the rotation speed of the outdoor fan is adjusted, as long as the current condensing pressure P is ensuredconWith a target condensing pressure PobjDifference value P ofcon-PobjWithin a predetermined range of difference [ - Δ, Δ [ - Δ [ ]]Therefore, the running state of the outdoor fan can be prevented from being adjusted repeatedly, and the stable running of the air conditioning system is facilitated. The specific value of the safety return difference Δ is not limited, and may be set according to a test result or experience, which is not described herein.
In an embodiment of the invention, the controller is further configured to:
acquiring a rotating speed adjusting range of the outdoor fan;
when the first rotating speed is greater than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
Because the outdoor fan has a fixed rotation speed adjusting range, when the difference value between the current condensing pressure and the target condensing pressure is smaller than the lower limit value of the preset difference value range, the difference value can be ensured to be within the preset difference value range only by increasing the current condensing pressure to the second condensing pressure, namely, the second rotation speed corresponding to the second condensing pressure is the highest rotation speed for ensuring that the difference value is within the preset difference value range, if the outdoor fan still operates at a certain rotation speed higher than the second rotation speed, the condensing pressure is inevitably lower than the second condensing pressure, therefore, when the second rotation speed is smaller than the lowest operation rotation speed of the rotation speed adjusting range, the condensing pressure can be increased by closing the outdoor fan, so as to avoid cold waste; similarly, when the difference between the current condensing pressure and the target condensing pressure is greater than the upper limit value of the preset difference range, at least the current condensing pressure needs to be reduced to the first condensing pressure to ensure that the difference is within the preset difference range, that is, the first rotating speed corresponding to the first condensing pressure is the lowest rotating speed for ensuring that the difference is within the preset difference range, if the outdoor fan still operates at a certain rotating speed lower than the first rotating speed, the condensing pressure is inevitably higher than the first condensing pressure, and therefore when the first rotating speed is greater than the highest operating rotating speed of the rotating speed adjusting range, the outdoor fan needs to be operated at the highest operating rotating speed to meet the indoor required cooling capacity as much as possible.
In the above embodiment, the controller is further configured to:
after the execution control outdoor fan is closed, returning to continue executing to obtain the current compressor rotating speed and the current environment temperature; and after the outdoor fan is controlled to operate at the highest operation rotating speed, returning to continuously execute the operation of obtaining the current compressor rotating speed and the current environment temperature.
The scheme of the embodiment can avoid that the condensing pressure is excessively increased due to the long-time closing of the outdoor fan or the condensing pressure is excessively reduced due to the long-time operation at the highest operation rotating speed, so that the air conditioning system can keep an operation state with high energy efficiency.
As shown in fig. 2, based on the same inventive concept, an embodiment of the present invention further provides an operation control method of an air conditioning system, including:
step 101, acquiring the current rotating speed of a compressor, the current environment temperature and the current condensing pressure;
step 102, determining a target condensing pressure of an air conditioning system when the air conditioning system operates at a current compressor rotating speed at a current ambient temperature;
and 103, comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.
In the scheme of the embodiment of the invention, the target condensing pressure of the air conditioning system is determined when the air conditioning system operates at the current compressor rotating speed at the current environment temperature, and the rotating speed of the outdoor fan is controlled according to the comparison result between the current condensing pressure and the target condensing pressure, so that the current condensing pressure approaches the target condensing pressure more, and the energy efficiency of the air conditioning system under the current operating condition is improved. Compared with the prior art, the scheme has the advantages that the adjustment of the condensing pressure is not limited to a fixed target pressure range any more, and the air conditioning system can realize or approach the optimal energy efficiency under the operation condition when operating at any ambient temperature and at any compressor rotating speed, so that the energy efficiency of the air conditioning system is greatly improved.
In a particular embodiment, determining a target condensing pressure for an air conditioning system operating at a current compressor speed at a current ambient temperature comprises:
acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of the compressor, the ambient temperature and the target condensation pressure;
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
In a particular embodiment, determining a target condensing pressure for an air conditioning system operating at a current compressor speed at a current ambient temperature comprises:
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the prestored operational relationship among the compressor rotating speed, the ambient temperature and the target condensing pressure.
In a specific embodiment, the controlling the rotation speed of the outdoor fan according to the comparison result specifically includes:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling an outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with the pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with the pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to the range from the first rotating speed to the second rotating speed for operation.
In a particular embodiment, the method further comprises:
acquiring a rotating speed adjusting range of the outdoor fan;
when the first rotating speed is greater than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and
and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
In a particular embodiment, the method further comprises:
after the step of controlling the outdoor fan to be closed is executed, returning to continuously executing the step of obtaining the current compressor rotating speed and the current environment temperature; and
and after the step of controlling the outdoor fan to operate at the highest running rotating speed is executed, returning to the step of continuously acquiring the current rotating speed of the compressor and the current ambient temperature.
As shown in fig. 3, based on the same inventive concept, an embodiment of the present invention further provides an operation control device of an air conditioning system, including:
a first obtaining unit 100, configured to obtain a current compressor rotation speed, a current ambient temperature, and a current condensing pressure;
a determination unit 200, configured to determine a target condensing pressure when the air conditioning system operates at a current compressor rotation speed at a current ambient temperature;
and a control unit 300 for comparing the current condensing pressure with the target condensing pressure and controlling the rotation speed of the outdoor fan according to the comparison result.
In the scheme of the embodiment of the invention, the target condensing pressure of the air conditioning system is determined when the air conditioning system operates at the current compressor rotating speed at the current environment temperature, and the rotating speed of the outdoor fan is controlled according to the comparison result between the current condensing pressure and the target condensing pressure, so that the current condensing pressure approaches the target condensing pressure more, and the energy efficiency of the air conditioning system under the current operating condition is improved. Compared with the prior art, the scheme has the advantages that the adjustment of the condensing pressure is not limited to a fixed target pressure range any more, and the air conditioning system can realize or approach the optimal energy efficiency under the operation condition when operating at any ambient temperature and at any compressor rotating speed, so that the energy efficiency of the air conditioning system is greatly improved.
In a specific embodiment, the determining unit 200 is further configured to:
acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of the compressor, the ambient temperature and the target condensation pressure;
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
In a specific embodiment, the determining unit 200 is further configured to:
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the prestored operational relationship among the compressor rotating speed, the ambient temperature and the target condensing pressure.
In a specific embodiment, the control unit 300 is specifically configured to:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling an outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with the pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with the pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to the range from the first rotating speed to the second rotating speed for operation.
In a specific embodiment, further comprising:
the second acquisition unit is used for acquiring the rotating speed adjusting range of the outdoor fan;
the control unit 300 is further configured to: when the first rotating speed is greater than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and
and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
In a particular embodiment, the control unit 300 is further configured to:
after the step of controlling the outdoor fan to be closed is executed, returning to continuously executing the step of obtaining the current compressor rotating speed and the current environment temperature; and
and after the step of controlling the outdoor fan to operate at the highest running rotating speed is executed, returning to the step of continuously acquiring the current rotating speed of the compressor and the current ambient temperature.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (18)

1. An air conditioning system comprises a compressor, a condenser, a throttling element and an evaporator which are sequentially connected through pipelines and form a closed cycle; it is characterized by also comprising:
the pressure detection module is used for detecting the condensation pressure;
the temperature detection module is used for detecting the ambient temperature of the position where the condenser is located;
the rotating speed detection module is used for detecting the rotating speed of the compressor;
the controller, respectively with compressor, the outdoor fan that condenser department set up, pressure detection module, temperature detection module and rotational speed detection module are connected for: acquiring the current rotating speed of a compressor, the current ambient temperature and the current condensing pressure; determining a target condensing pressure of the air conditioning system when the air conditioning system operates at a current compressor rotation speed at a current ambient temperature; and comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.
2. The air conditioning system of claim 1, wherein the controller is further configured to:
acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of a compressor, the ambient temperature and the target condensation pressure;
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
3. The air conditioning system of claim 1, wherein the controller is further configured to:
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the prestored operational relationship among the compressor rotating speed, the ambient temperature and the target condensing pressure.
4. The air conditioning system of claim 1, wherein the controller is specifically configured to:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling the outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with a pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with a pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to operate within the range from the first rotating speed to the second rotating speed.
5. The air conditioning system of claim 4, wherein the controller is further configured to:
acquiring a rotating speed adjusting range of the outdoor fan;
when the first rotating speed is larger than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and
and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
6. The air conditioning system of claim 5, wherein the controller is further configured to:
after the outdoor fan is controlled to be closed, returning to continue to execute the operation of obtaining the current compressor rotating speed and the current environment temperature; and
and after the outdoor fan is controlled to operate at the highest running rotating speed, returning to continuously obtain the current rotating speed of the compressor and the current ambient temperature.
7. An operation control method applied to the air conditioning system according to claim 1, characterized by comprising:
acquiring the current rotating speed of a compressor, the current ambient temperature and the current condensing pressure;
determining a target condensing pressure of the air conditioning system when the air conditioning system operates at a current compressor rotation speed at a current ambient temperature;
and comparing the current condensing pressure with the target condensing pressure, and controlling the rotating speed of the outdoor fan according to the comparison result.
8. The operation control method of an air conditioning system as set forth in claim 7, wherein said determining a target condensing pressure at which the air conditioning system is operated at a current compressor rotation speed at a current ambient temperature comprises:
acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of a compressor, the ambient temperature and the target condensation pressure;
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
9. The operation control method of an air conditioning system as set forth in claim 7, wherein said determining a target condensing pressure at which the air conditioning system is operated at a current compressor rotation speed at a current ambient temperature comprises:
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the prestored operational relationship among the compressor rotating speed, the ambient temperature and the target condensing pressure.
10. The operation control method of an air conditioning system according to claim 7, wherein the controlling the rotation speed of the outdoor fan according to the comparison result specifically includes:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling the outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with a pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with a pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to operate within the range from the first rotating speed to the second rotating speed.
11. The operation control method of an air conditioning system as set forth in claim 10, characterized in that the method further comprises:
acquiring a rotating speed adjusting range of the outdoor fan;
when the first rotating speed is larger than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and
and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
12. The operation control method of an air conditioning system as set forth in claim 11, characterized in that the method further comprises:
after the step of controlling the outdoor fan to be closed is executed, returning to continuously executing the step of obtaining the current compressor rotating speed and the current environment temperature; and
and after the step of controlling the outdoor fan to operate at the highest operation rotating speed is executed, returning to continuously execute the step of obtaining the current compressor rotating speed and the current environment temperature.
13. An operation control device applied to the air conditioning system according to claim 1, comprising:
the first acquisition unit is used for acquiring the current rotating speed of the compressor, the current ambient temperature and the current condensing pressure;
a determination unit for determining a target condensing pressure at which the air conditioning system operates at a current compressor rotational speed at a current ambient temperature;
and the control unit is used for comparing the current condensing pressure with the target condensing pressure and controlling the rotating speed of the outdoor fan according to the comparison result.
14. The operation control device of an air conditioning system according to claim 13, characterized in that the determination unit is further configured to:
acquiring a target condensation pressure database, wherein the target condensation pressure database stores mapping relations among the rotating speed of a compressor, the ambient temperature and the target condensation pressure;
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the target condensing pressure database.
15. The operation control device of an air conditioning system according to claim 13, characterized in that the determination unit is further configured to:
and determining the target condensing pressure of the air conditioning system when the air conditioning system operates at the current compressor rotating speed at the current ambient temperature according to the prestored operational relationship among the compressor rotating speed, the ambient temperature and the target condensing pressure.
16. The operation control device of an air conditioning system according to claim 13, wherein the control unit is specifically configured to:
when the difference value between the current condensing pressure and the target condensing pressure is within a preset difference value range, controlling the outdoor fan to maintain the current fan rotating speed; and
when the difference value between the current condensing pressure and the target condensing pressure is not within the preset difference value range, determining a first condensing pressure with a pressure value being the sum of the target condensing pressure and the upper limit value of the preset difference value range and a second condensing pressure with a pressure value being the sum of the target condensing pressure and the lower limit value of the preset difference value range, determining a first rotating speed corresponding to the first condensing pressure and a second rotating speed corresponding to the second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the rotating speed of the outdoor fan to be reduced to operate within the range from the first rotating speed to the second rotating speed.
17. The operation control device of an air conditioning system as claimed in claim 16, further comprising:
the second acquisition unit is used for acquiring the rotating speed adjusting range of the outdoor fan;
the control unit is further configured to: when the first rotating speed is larger than the highest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to operate at the highest operating rotating speed; and
and when the second rotating speed is less than the lowest operating rotating speed of the rotating speed adjusting range, controlling the outdoor fan to be closed.
18. The operation control device of an air conditioning system as claimed in claim 17, wherein the control unit is further configured to:
after the step of controlling the outdoor fan to be closed is executed, returning to continuously executing the step of obtaining the current compressor rotating speed and the current environment temperature; and
and after the step of controlling the outdoor fan to operate at the highest operation rotating speed is executed, returning to continuously execute the step of obtaining the current compressor rotating speed and the current environment temperature.
CN201811478540.5A 2018-12-05 2018-12-05 Air conditioning system, and operation control method and device of air conditioning system Pending CN111271833A (en)

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