CN112594884B - Air conditioning unit and condenser fan control method and device thereof and storage medium - Google Patents
Air conditioning unit and condenser fan control method and device thereof and storage medium Download PDFInfo
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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
- F24F11/62—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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control 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
- F24F11/77—Control 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
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Abstract
The invention provides an air conditioning unit, a method and a device for controlling a condenser fan of the air conditioning unit and a storage medium, wherein the method comprises the following steps: detecting the high-pressure and/or the compressor current of the high-pressure side of the system in the operation process of the air conditioning unit; determining the adjustment amplitude of the condenser fan frequency according to the detected high-pressure and/or the detected compressor current; and adjusting the frequency of the condenser fan according to the determined adjustment amplitude. The scheme provided by the invention can solve the problem that the air volume requirements of the condenser fan are different under different working conditions of the variable frequency air conditioning unit.
Description
Technical Field
The invention relates to the field of control, in particular to an air conditioning unit, a condenser fan control method and device thereof and a storage medium.
Background
Compared with a fixed frequency unit, the variable frequency air-cooled water chilling unit has the advantages that the frequency of the compressor and the frequency of the condenser fan can be adjusted in a stepless mode, so that the load output of the unit can be accurately controlled, and the comfort of a user is improved. At present, most air-cooled water chilling units in the market use a single air quantity control mode of a condenser, and the rotating speed of a fan is completely adjusted according to condensing temperature or high-pressure. The control mode can meet the normal heat exchange requirement of the condenser, but cannot enable the unit to operate in the state of optimal efficiency, particularly under the working condition of partial load (when the unit operates in the working condition of insufficient load), the compressor operates at different loads, and the ratio of the fan power to the compressor power is different, so that the air volume of the fan of the condenser needs to be optimally controlled according to different working conditions, and the operating efficiency of the unit is improved.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides an air conditioning unit, a condenser fan control method and device thereof and a storage medium, so as to solve the problem that the air volume requirements of condenser fans are different under different working conditions of a variable frequency air conditioning unit in the prior art.
The invention provides a condenser fan control method of an air conditioning unit, which comprises the following steps:
detecting the high-pressure and/or the compressor current of the high-pressure side of the system in the operation process of the air conditioning unit; determining the adjustment amplitude of the condenser fan frequency according to the detected high-pressure and/or the detected compressor current; and adjusting the frequency of the condenser fan according to the determined adjustment amplitude.
Optionally, determining the adjustment amplitude of the condenser fan frequency according to the detected high pressure comprises: calculating a first modulation amplitude of the condenser fan frequency according to the high pressure by the following formula (1);
K1＝k×(B-B0)×100％ (1)
wherein, B is the high pressure, B0 is a preset target high pressure, and k is an adjusting coefficient;
determining an amplitude of modulation of the condenser fan frequency based on the detected compressor current, comprising: calculating a second modulation amplitude of the condenser fan frequency according to the compressor current by the following formula (2);
K2＝(A-A0)×100％ (2)
where A is the compressor current and A0 is the compressor theoretical current value.
Optionally, determining the adjustment amplitude of the condenser fan frequency according to the detected high pressure and the detected compressor current comprises: calculating a first motor power adjusted according to the first adjusting amplitude and a second motor power adjusted according to the second adjusting amplitude through a motor power formula; determining the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude according to the calculated first motor power and the second motor power; taking the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude as the adjustment amplitude of the fan frequency of the condenser; wherein the first electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the first adjustment amplitude; and the second electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the second adjusting amplitude.
Optionally, the method further comprises: after the air conditioning system is started, controlling the condenser fan to be started according to a preset initial frequency before the compressor is started for a first preset time; and detecting the high-pressure and/or the current of the compressor at the high-pressure side of the system after controlling the condenser fan to start and operate for a second preset time according to the preset initial frequency.
In another aspect, the present invention provides a condenser fan control device for an air conditioning unit, including:
the detection unit is used for detecting the high-pressure and/or the compressor current of the high-pressure side of the system in the operation process of the air conditioning unit; the determining unit is used for determining the adjusting amplitude of the frequency of the condenser fan according to the high-pressure and/or the compressor current detected by the detecting unit; and the adjusting unit is used for adjusting the frequency of the condenser fan according to the adjusting amplitude determined by the determining unit.
Optionally, the determining unit, configured to determine the adjustment amplitude of the condenser fan frequency according to the detected high-pressure, includes: calculating a first modulation amplitude of the condenser fan frequency according to the high pressure by the following formula (1);
K1＝k×(B-B0)×100％ (1)
wherein B0 is a preset target high-pressure, and k is an adjusting coefficient;
the determining unit, which determines the adjusting amplitude of the condenser fan frequency according to the detected compressor current, comprises: calculating a second modulation amplitude of the condenser fan frequency according to the compressor current by the following formula (2);
K2＝(A-A0)×100％ (2)
where a0 is the compressor theoretical current value.
Optionally, the determining unit, configured to determine the adjustment amplitude of the condenser fan frequency according to the detected high-pressure and the detected compressor current, includes: calculating a first motor power adjusted according to the first adjusting amplitude and a second motor power adjusted according to the second adjusting amplitude through a motor power formula; determining the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude according to the calculated first motor power and the second motor power; taking the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude as the adjustment amplitude of the fan frequency of the condenser; wherein the first electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the first adjustment amplitude; and the second electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the second adjusting amplitude.
Optionally, the method further comprises: the control unit is used for controlling the condenser fan to start according to a preset initial frequency before the compressor starts for a first preset time after the air conditioning system is started; the detection unit is further configured to: and detecting the high-pressure and/or the current of the compressor at the high-pressure side of the system after controlling the condenser fan to start and operate for a second preset time according to the preset initial frequency.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
In yet another aspect, the present invention provides an air conditioning unit, including a processor, a memory, and a computer program stored in the memory and operable on the processor, wherein the processor executes the computer program to implement the steps of any of the methods described above.
In another aspect, the invention provides an air conditioning unit comprising any one of the condenser fan control devices described above.
According to the technical scheme, the adjusting amplitude of the frequency of the condenser fan is determined according to the high-pressure and/or the current of the compressor of the air conditioning unit, so that the problems of different air volume requirements of the condenser fan under different working conditions of the variable-frequency air conditioning unit, low unit energy efficiency ratio caused by single variable control and poor fan adjusting efficiency, short service life and the like caused by passive adjusting control are solved; the pressure and power dimensions of the unit are calculated and the pre-judgment is carried out preferentially, so that the adjustment load coefficient which enables the unit operation energy efficiency ratio to reach the highest is obtained, and then the actual adjustment is carried out on the fan, so that the intelligent control system is more intelligent and effective compared with a single control variable; the power is calculated to carry out pre-judgment, unnecessary adjustment of the fan is avoided, energy is saved, and the service life of the motor is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a method schematic of one embodiment of a condenser fan control method provided by the present invention;
FIG. 2 is a schematic method diagram of a condenser fan control method for an air conditioning unit according to an embodiment of the present invention;
fig. 3 is a block diagram of a condenser fan control device of an air conditioning unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a control method for a fan of a condenser of an air conditioning unit. The method is particularly suitable for controlling the condenser fan during the refrigerating operation of the variable-frequency air-cooled screw unit.
Fig. 1 is a schematic method diagram of an embodiment of a condenser fan control method provided by the present invention.
As shown in fig. 1, according to an embodiment of the present invention, the control method includes at least step S110, step S120, and step S130.
And step S110, detecting the high-pressure and/or the compressor current of the high-pressure side of the system in the operation process of the air conditioning system.
Specifically, according to characteristic curves of a compressor motor and a fan motor used by the air conditioning unit, an external characteristic curve mathematical model f (x1) about the compressor motor and an external characteristic curve mathematical model f (x2) about the fan motor are obtained through fitting, and accordingly basic logic of air conditioning unit fan operation air conditioning control is obtained. In order to ensure the normal starting of the unit, after the air conditioning system is started, controlling the condenser fan to start according to a preset initial frequency before the compressor starts for a first preset time; and detecting the high-pressure and/or the current of the compressor at the high-pressure side of the system after controlling the condenser fan to start and operate for a second preset time according to the preset initial frequency. For example, after the unit is turned on, the condenser fan is started at an initial frequency F0 (F0 is 50Hz, for example) 10 seconds before the compressor is started, and is kept running for 1 minute, and then the detection of the high pressure on the high pressure side of the system and/or the compressor current is started to enter the automatic optimization control regulation.
Alternatively, the actual high-pressure B during the operation of the unit can be detected by a pressure sensor arranged on a high-pressure side pipeline of the system, and the actual compressor current value a during the operation of the unit can be detected by a current transformer arranged on a power line of the compressor.
And step S120, determining the adjusting amplitude of the condenser fan frequency according to the detected high-pressure and/or the detected compressor current.
In one embodiment, determining the magnitude of the adjustment of the condenser fan frequency based on the sensed high pressure comprises: calculating a first modulation amplitude K1 of the condenser fan frequency according to the high pressure B by the following formula (1);
K1＝k×(B-B0)×100％ (1)
where B0 is a target high pressure set according to the unit design pressure, for example 800kPa, and k is an adjustment coefficient, which can be obtained through a plurality of tests, for example 0.03. The above formula (1) obtains the adjustment amplitude (i.e. the frequency adjustment percentage) of the condenser fan frequency according to the deviation between the actual high pressure B of the unit and the target high pressure B0.
Determining an amplitude of modulation of the condenser fan frequency based on the detected compressor current, comprising: calculating a second modulation amplitude K2 of the condenser fan frequency from the compressor current by the following equation (2);
K2＝(A-A0)×100％ (2)
wherein, A0 is compressor theoretical current value, which can be obtained by the controller according to the compressor actual frequency in f (x1) automatic fitting calculation. The above equation (2) obtains the adjustment amplitude (i.e. the frequency adjustment percentage) of the condenser fan frequency according to the deviation of the compressor actual current value a and the compressor theoretical current value a 0.
Preferably, after a first regulation amplitude is calculated according to the high-pressure and a second regulation amplitude is calculated according to the compressor current, pre-regulation is carried out according to the first regulation amplitude and the second regulation amplitude to obtain the preferred regulation amplitude of the condenser fan frequency.
Specifically, a first motor power adjusted according to the first adjustment amplitude and a second motor power adjusted according to the second adjustment amplitude are calculated through a motor power formula (i.e., pre-adjusted); determining the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude according to the calculated first motor power and the second motor power; and taking the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude as the adjustment amplitude of the frequency of the condenser fan. Wherein the first electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the first adjustment amplitude; and the second electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the second adjusting amplitude.
More specifically, a sum P1 of powers of the compressor motor and the condenser fan motor adjusted according to the first adjustment range is calculated from a motor power formula P ═ n × T)/9550 according to an external characteristic curve of the compressor motor and an external characteristic curve of the condenser fan motor, and a sum P2 of powers of the compressor motor and the condenser fan motor adjusted according to the second adjustment range is calculated from a motor power formula P ═ n × T)/9550 according to an external characteristic curve of the compressor motor and an external characteristic curve of the condenser fan motor. N is the motor rotating speed, the compressor motor rotating speed can be obtained according to the first adjusting amplitude and the current frequency of the condensation fan motor, the condensation fan motor rotating speed can be obtained according to the second adjusting amplitude and the current frequency of the condensation fan motor, and T is the torque of the motor at the corresponding rotating speed and is obtained according to the external characteristic curve of the compressor motor and the compressor motor rotating speed or is obtained according to the external characteristic curve of the condenser fan motor and the condensation fan motor rotating speed; n, P and T are the relation quantity of the external characteristic curve of the motor, and the values are in one-to-one correspondence according to the curve.
And S130, adjusting the frequency of the condenser fan according to the determined adjusting amplitude.
For example, the frequency of the condenser fan is adjusted according to the determined adjustment amplitude with the minimum motor power.
According to the embodiment of the invention, the pressure and power dimensions of the unit are calculated and pre-judged preferentially, so that the adjustment load coefficient which enables the unit operation energy efficiency ratio to reach the highest is obtained, and then the actual adjustment is carried out on the fan, so that the method is more intelligent and effective compared with a single control variable; the power is calculated to carry out pre-judgment, unnecessary adjustment of the fan is avoided, energy is saved, and the service life of the motor is prolonged.
In order to clearly illustrate the technical solution of the present invention, an implementation flow of the method for controlling a condenser fan of an air conditioning unit according to the present invention is described below with an embodiment.
Fig. 2 is a schematic method diagram of a method for controlling a condenser fan of an air conditioning unit according to an embodiment of the present invention. As shown in fig. 2:
according to the characteristic curve designed by the compressor motor and the fan motor used by the air conditioning unit, an external characteristic curve mathematical model f (x1) about the compressor motor and an external characteristic curve mathematical model f (x2) about the fan motor are obtained through fitting, and accordingly basic logic of air conditioning control of the operation of the fan of the air conditioning unit is obtained.
And step S1, after the unit is selected to be started, the fan of the condenser of the air conditioning unit is started and operated for 1 minute according to the initial frequency F0 10 seconds before the compressor is started, and then automatic optimization control adjustment is carried out. Detecting and obtaining actual high-pressure B in the running process of the unit through a pressure sensor arranged on a high-pressure side pipeline of the system; and detecting the actual current value A of the compressor in the operation process of the unit through a current transformer arranged on a power line of the compressor.
Step S2, calculating according to the high-pressure B in the running process of the unit and through a formula K1 which is K x (B-B0) x 100% to obtain a frequency adjusting stride K1 of the condenser fan; where B0 is the target high pressure (e.g., 800kPa) set according to the unit design pressure.
Step S3, calculating according to the compressor current A in the running process of the unit by a formula K2 ═ A-A0 x 100% to obtain a frequency adjustment stride K2 of the condenser fan; wherein A0 is compressor theoretical current value, and can be obtained by automatic fitting calculation in f (x1) according to compressor actual frequency by a controller.
In step S4, the controller pre-adjusts the frequency of the condenser fan according to the K1 value obtained in step S2, that is, according to the external characteristic curve of the compressor and the fan, the pre-adjusted power is calculated by the motor power formula P ═ n × T)/9550, and the sum P1 of the power is obtained.
In step S5, the controller pre-adjusts the frequency of the condenser fan according to the K2 value obtained in step S3, that is, according to the external characteristic curve of the compressor and the fan, the pre-adjusted power is calculated by the motor power formula P ═ n × T)/9550, and the sum P2 of the power is obtained.
And step S6, judging the sizes of P1 and P2 in the two adjusting modes according to the P1 and the P2 obtained in the step S4 and the step S5, taking the minimum value Pmin (P1 and P2) to obtain an adjusting mode with smaller power, outputting a corresponding fan frequency adjusting step, and finally finishing the fan frequency adjustment.
The invention also provides a fan control device of the condenser of the air conditioning unit. The device is particularly suitable for controlling the fan of the condenser during the refrigerating operation of the variable-frequency air-cooled screw unit.
Fig. 3 is a block diagram of a condenser fan control device of an air conditioning unit according to an embodiment of the present invention. As shown in fig. 3, the control apparatus 100 includes a detection unit 110, a determination unit 120, and an adjustment unit 130.
The detection unit 110 is used to detect the high-pressure and/or the compressor current on the high-pressure side of the system during the operation of the air conditioning unit.
Specifically, according to characteristic curves of a compressor motor and a fan motor used by the air conditioning unit, an external characteristic curve mathematical model f (x1) about the compressor motor and an external characteristic curve mathematical model f (x2) about the fan motor are obtained through fitting, and accordingly basic logic of air conditioning unit fan operation air conditioning control is obtained.
The device 100 further includes a control unit (not shown), for ensuring normal start of the unit, the control unit controls the condenser fan to start at a preset initial frequency before the compressor starts for a first preset time after the air conditioning system is started; after the control unit controls the condenser fan to start and operate for a second preset time according to the preset initial frequency, the detection unit 110 detects the high-pressure and/or the compressor current on the high-pressure side of the system. For example, after the unit is turned on, the condenser fan is started at an initial frequency F0 (F0 is 50Hz, for example) 10 seconds before the compressor is started, and is kept running for 1 minute, and then the detection of the high pressure on the high pressure side of the system and/or the compressor current is started to enter the automatic optimization control regulation.
Alternatively, the detecting unit 110 may detect an actual high-pressure B during the operation of the unit through a pressure sensor disposed in the high-pressure side pipeline of the system, and detect an actual compressor current value a during the operation of the unit through a current transformer disposed in the power line of the compressor.
The determination unit 120 is configured to determine an adjustment magnitude of the condenser fan frequency according to the high pressure and/or the compressor current detected by the detection unit 110. The adjusting unit 130 is configured to perform frequency adjustment on the condenser fan according to the adjusting amplitude determined by the determining unit 120.
In a specific embodiment, the determining unit 120 determines the adjustment amplitude of the condenser fan frequency according to the high pressure detected by the detecting unit 110, and includes: calculating a first modulation amplitude K1 of the condenser fan frequency according to the high pressure B by the following formula (1);
K1＝k×(B-B0)×100％ (1)
where B0 is a target high pressure set according to the unit design pressure, for example 800kPa, and k is an adjustment coefficient, which can be obtained through a plurality of tests, for example 0.03. The above formula (1) obtains the adjustment amplitude (i.e. the frequency adjustment percentage) of the condenser fan frequency according to the deviation between the actual high pressure B of the unit and the target high pressure B0.
The determining unit 120 determines the adjustment amplitude of the condenser fan frequency according to the compressor current detected by the detecting unit 110, including: calculating a second modulation amplitude K2 of the condenser fan frequency from the compressor current by the following equation (2);
K2＝(A-A0)×100％ (2)
wherein, A0 is compressor theoretical current value, which can be obtained by the controller according to the compressor actual frequency in f (x1) automatic fitting calculation. The above equation (2) obtains the adjustment amplitude (i.e. the frequency adjustment percentage) of the condenser fan frequency according to the deviation of the compressor actual current value a and the compressor theoretical current value a 0.
Preferably, after the determining unit 120 calculates a first adjustment amplitude according to the high-pressure and calculates a second adjustment amplitude according to the compressor current, the determining unit performs pre-adjustment according to the first adjustment amplitude and the second adjustment amplitude to obtain a preferred adjustment amplitude of the condenser fan frequency.
Specifically, a first motor power adjusted according to the first adjustment amplitude and a second motor power adjusted according to the second adjustment amplitude are calculated through a motor power formula (i.e., pre-adjusted); determining the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude according to the calculated first motor power and the second motor power; and taking the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude as the adjustment amplitude of the frequency of the condenser fan. Wherein the first electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the first adjustment amplitude; and the second electric power is the sum of the powers of the compressor motor and the fan motor after being adjusted according to the second adjusting amplitude.
More specifically, a sum P1 of powers of the compressor motor and the condenser fan motor adjusted according to the first adjustment range is calculated from a motor power formula P ═ n × T)/9550 according to an external characteristic curve of the compressor motor and an external characteristic curve of the condenser fan motor, and a sum P2 of powers of the compressor motor and the condenser fan motor adjusted according to the second adjustment range is calculated from a motor power formula P ═ n × T)/9550 according to an external characteristic curve of the compressor motor and an external characteristic curve of the condenser fan motor. N is the motor rotating speed, the compressor motor rotating speed can be obtained according to the first adjusting amplitude and the current frequency of the condensation fan motor, the condensation fan motor rotating speed can be obtained according to the second adjusting amplitude and the current frequency of the condensation fan motor, and T is the torque of the motor at the corresponding rotating speed and is obtained according to the external characteristic curve of the compressor motor and the compressor motor rotating speed or is obtained according to the external characteristic curve of the condenser fan motor and the condensation fan motor rotating speed; n, P and T are the relation quantity of the external characteristic curve of the motor, and the values are in one-to-one correspondence according to the curve.
According to the embodiment of the invention, the pressure and power dimensions of the unit are calculated and pre-judged preferentially, so that the adjustment load coefficient which enables the unit operation energy efficiency ratio to reach the highest is obtained, and then the actual adjustment is carried out on the fan, so that the method is more intelligent and effective compared with a single control variable; the power is calculated to carry out pre-judgment, unnecessary adjustment of the fan is avoided, energy is saved, and the service life of the motor is prolonged.
The invention also provides a storage medium corresponding to the control method of the condenser fan of the air conditioning unit, and a computer program is stored on the storage medium, and when the program is executed by a processor, the steps of any one of the methods are realized.
The invention also provides an air conditioner corresponding to the condenser fan control method of the air conditioning unit, which comprises a processor, a memory and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.
The invention also provides an air conditioner corresponding to the condenser fan control device of the air conditioning unit, which comprises any one of the condenser fan control devices.
According to the scheme provided by the invention, the adjusting amplitude of the frequency of the condenser fan is determined according to the high-pressure and/or the current of the compressor of the air conditioning unit, so that the problems of different air volume requirements of the condenser fan under different working conditions of the variable-frequency air conditioning unit, low unit energy efficiency ratio caused by single variable control and poor fan adjusting efficiency, service life attenuation and the like caused by passive adjusting control are solved; the pressure and power dimensions of the unit are calculated and the pre-judgment is carried out preferentially, so that the adjustment load coefficient which enables the unit operation energy efficiency ratio to reach the highest is obtained, and then the actual adjustment is carried out on the fan, so that the intelligent control system is more intelligent and effective compared with a single control variable; the power is calculated to carry out pre-judgment, unnecessary adjustment of the fan is avoided, energy is saved, and the service life of the motor is prolonged.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. A method for controlling a condenser fan of an air conditioning unit is characterized by comprising the following steps:
detecting high-pressure and compressor current of a high-pressure side of a system in the operation process of the air conditioning unit;
determining the adjusting amplitude of the fan frequency of the condenser according to the detected high-pressure and the detected compressor current;
adjusting the frequency of the condenser fan according to the determined adjusting amplitude;
determining an amplitude of modulation of the condenser fan frequency based on the detected high pressure, comprising:
calculating a first modulation amplitude of the condenser fan frequency according to the high pressure by the following formula (1);
K1＝k×(B-B0)×100％ (1)
wherein, B is the high pressure, B0 is a preset target high pressure, and k is an adjusting coefficient;
determining an amplitude of modulation of the condenser fan frequency based on the detected compressor current, comprising:
calculating a second modulation amplitude of the condenser fan frequency according to the compressor current by the following formula (2);
K2＝(A-A0)×100％ (2)
wherein A is the compressor current, and A0 is the compressor theoretical current value;
determining an amplitude of modulation of condenser fan frequency based on the detected high pressure and compressor current, comprising:
calculating a first motor power adjusted according to the first adjusting amplitude and a second motor power adjusted according to the second adjusting amplitude through a motor power formula;
determining the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude according to the calculated first motor power and the second motor power;
taking the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude as the adjustment amplitude of the fan frequency of the condenser;
the power of the first motor is the sum of the power of the compressor motor and the power of the condenser fan motor after being adjusted according to the first adjusting amplitude; and the power of the second motor is the sum of the power of the compressor motor and the power of the condenser fan motor after being adjusted according to the second adjusting amplitude.
2. The method of claim 1, further comprising:
after the air conditioning system is started, controlling the condenser fan to be started according to a preset initial frequency before the compressor is started for a first preset time;
and after controlling the condenser fan to start and operate for a second preset time according to the preset initial frequency, detecting the high-pressure and the compressor current of the high-pressure side of the system.
3. The utility model provides an air conditioning unit's condenser fan controlling means which characterized in that includes:
the detection unit is used for detecting the high-pressure and the compressor current of the high-pressure side of the system in the operation process of the air conditioning unit;
the determining unit is used for determining the adjusting amplitude of the frequency of the condenser fan according to the high-pressure and the compressor current detected by the detecting unit;
the adjusting unit is used for adjusting the frequency of the condenser fan according to the adjusting amplitude determined by the determining unit;
the determining unit determines the adjustment amplitude of the frequency of the condenser fan according to the detected high-pressure, and comprises:
calculating a first modulation amplitude of the condenser fan frequency according to the high pressure by the following formula (1);
K1＝k×(B-B0)×100％ (1)
wherein, B is the high pressure, B0 is a preset target high pressure, and k is an adjusting coefficient;
the determining unit, which determines the adjusting amplitude of the condenser fan frequency according to the detected compressor current, comprises:
calculating a second modulation amplitude of the condenser fan frequency according to the compressor current by the following formula (2);
K2＝(A-A0)×100％ (2)
wherein A is the compressor current, and A0 is the compressor theoretical current value;
the determining unit determines the adjustment amplitude of the frequency of the condenser fan according to the detected high-pressure and the detected compressor current, and comprises the following steps:
calculating a first motor power adjusted according to the first adjusting amplitude and a second motor power adjusted according to the second adjusting amplitude through a motor power formula;
determining the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude according to the calculated first motor power and the second motor power;
taking the adjustment amplitude with the minimum motor power in the first adjustment amplitude and the second adjustment amplitude as the adjustment amplitude of the fan frequency of the condenser;
the power of the first motor is the sum of the power of the compressor motor and the power of the condenser fan motor after being adjusted according to the first adjusting amplitude; and the power of the second motor is the sum of the power of the compressor motor and the power of the condenser fan motor after being adjusted according to the second adjusting amplitude.
4. The apparatus of claim 3, further comprising:
the control unit is used for controlling the condenser fan to start according to a preset initial frequency before the compressor starts for a first preset time after the air conditioning system is started;
the detection unit is further configured to: and detecting the high-pressure and the current of the compressor at the high-pressure side of the system after the control unit controls the condenser fan to start and operate for a second preset time according to the preset initial frequency.
5. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1-2.
6. An air conditioning assembly comprising a processor, a memory and a computer program stored on the memory and operable on the processor to perform the steps of the method of any of claims 1 to 2 or comprising the condenser fan control apparatus of any of claims 3 to 4 when the program is executed by the processor.
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| CN113639444B (en) * | 2021-08-24 | 2022-11-04 | 宁波奥克斯电气股份有限公司 | Control method and control device for improving comfort of air conditioner and air conditioner |
| CN114279049A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Refrigerating unit and control method for automatically optimizing frequency of variable frequency fan of refrigerating unit |
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