CN110260492B - Fan and compressor control method under refrigeration mode of variable frequency air conditioner - Google Patents
Fan and compressor control method under refrigeration mode of variable frequency air conditioner Download PDFInfo
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- CN110260492B CN110260492B CN201910458553.4A CN201910458553A CN110260492B CN 110260492 B CN110260492 B CN 110260492B CN 201910458553 A CN201910458553 A CN 201910458553A CN 110260492 B CN110260492 B CN 110260492B
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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
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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Abstract
The invention relates to the technical field of refrigeration of variable frequency air conditioners, in particular to a fan and compressor control method under a refrigeration mode of a variable frequency air conditioner, which comprises the following steps of a, calculating a refrigeration demand Q; step b, the fan and the compressor are logically controlled according to the refrigeration demand Q, compared with the prior art, the refrigeration demand Q is accurately calculated, so that the frequency of the compressor is periodically adjusted according to the refrigeration demand Q and the rotating speed of the fan is periodically adjusted in stages according to the refrigeration demand Q, when the refrigeration demand changes or the refrigeration demand is low, the air supply temperature of an air conditioner cannot be suddenly raised or lowered due to instantaneous overshoot of the system, frequent starting and stopping of the compressor are reduced, the rotating speed of the fan can also be adjusted according to actual demands, an energy-saving state is kept, and both the control precision and the service life of the unit can be effectively improved.
Description
Technical Field
The invention relates to the technical field of variable frequency air conditioner refrigeration, in particular to a fan and a compressor control method in a variable frequency air conditioner refrigeration mode.
Background
The control modes of a fan and a compressor of the existing frequency conversion machine room air conditioner in a refrigeration mode are roughly divided into two modes. First, the compressor frequency is adjusted according to the refrigeration demand Q, and the fan speed remains unchanged. It has the following disadvantages: the rotating speed of the fan is unchanged, and when the compressor is in low load, the frequency of the compressor is reduced to the lowest, the air volume is large, the suction pressure is increased, the exhaust pressure is reduced, the compression ratio is low, the suction superheat degree is large, the compressor runs in an overload mode, the stability and the reliability of the compressor are reduced, meanwhile, the power consumption of the fan is increased, the rotating speed of the fan is unchanged, the heat generated by a motor per se can neutralize the cold energy generated by evaporation under low frequency, and the energy conservation is not facilitated. And secondly, the frequency of the compressor and the rotating speed of the fan are synchronously adjusted according to the refrigeration demand Q. The disadvantages are that: the rotation speed of a fan and the frequency of a compressor are synchronously adjusted, under the condition of medium-low thermal load, the compressor and the fan simultaneously reduce output in a short control period along with the reduction of the thermal load, the temperature of an air outlet of an air conditioner can quickly fall below a normal set value due to the hysteresis of the pressure and temperature change of an evaporator, the change of cold output by the evaporator is not large in a short time, the air quantity is quickly reduced, the system can control the compressor to be closed, the room temperature actually does not reach the set value at the moment, the compressor can be opened again, the actions are repeated, and the compressor is frequently started and stopped and the temperature fluctuation is large.
Above two kinds of refrigeration modes, when low thermal load or thermal load reduce, air conditioner fan high-speed operation can cause compressor overload and energy consumption height under the low thermal load, still can cause the compressor to frequently open the stop problem because the fan mismatches with the compressor rotational speed.
Disclosure of Invention
The invention aims to provide a control method of a fan and a compressor in a refrigeration mode of an inverter air conditioner aiming at the defects in the prior art, and the control method can solve the problem of high energy consumption.
The purpose of the invention is realized by the following technical scheme: the control method comprises the following steps of a, setting a shutdown requirement W, setting a starting requirement P, setting a maximum refrigeration requirement Qmax, setting a minimum refrigeration requirement Qmin and calculating a refrigeration requirement Q;
and b, respectively carrying out the following logic control on the fan and the compressor according to the refrigeration demand Q:
i. when the refrigeration demand Q is less than the shutdown demand W, the compressor is closed;
when the shutdown demand W is less than or equal to the refrigeration demand Q and less than the system starting demand P, the compressor keeps the current state and the running frequency is unchanged;
when the system starting demand P is less than or equal to the refrigeration demand Q and less than 100 percent, the compressor is started, and the running frequency of the compressor is increased along with the increase of the refrigeration demand Q or is reduced along with the reduction of the refrigeration demand Q;
when the refrigeration demand Q is more than or equal to 100%, the compressor keeps the highest frequency operation;
when any compressor is started, the fan needs to be switched to the highest rotating speed of the fan to operate for at least 2S, timing is started after the compressor is started, and the fan operates according to the following logic after the fan is started for maintaining time S1:
i. when the refrigeration demand Q is larger than or equal to Qmax, the fan increases the rotating speed by the fan speed regulation step length L, and the rotating speed change in each demand calculation period
Until the rotating speed of the fan reaches the highest rotating speed, wherein T1 is a target rotating speed, T0 is a current rotating speed, and M is a fan speed regulating ratio;
when the refrigeration demand Q is less than or equal to Qmin, the fan reduces the rotating speed by the fan speed regulation step length L, and the rotating speed change in each demand calculation period
Until the rotating speed of the fan reaches the lowest rotating speed, wherein T1 is a target rotating speed, T0 is a current rotating speed, and M is a fan speed regulating ratio;
when the refrigeration demand Q is between Qmin and Qmax, the rotating speed of the fan is increased along with the increase of the refrigeration demand Q or decreased along with the decrease of the refrigeration demand Q until the rotating speed reaches the target rotating speed for operation, and the rotating speed in each demand calculation period is changed
Wherein, T1 is the target rotation speed, T0 is the current rotation speed, M is the fan speed ratio.
In step a, the refrigeration demand Q is calculated as follows according to the temperature sensor detection value Td, the temperature control return difference value T β, the set temperature setting value Ts, and the temperature control accuracy Tc:
in the step b, after the compressor is started, the compressor keeps running for 2min at the starting frequency fz, then the frequency is adjusted according to the refrigeration requirement Q, and the minimum running time of the compressor is not less than 6 min.
In step b, the fan start-up maintaining time S1 is 5 min.
Wherein, in the step b, each demand calculation period is 10s-20 s.
The invention has the beneficial effects that: according to the fan and the compressor control method under the refrigeration mode of the variable frequency air conditioner, the refrigeration demand Q is accurately calculated, so that the frequency of the compressor is periodically adjusted according to the refrigeration demand Q and the rotating speed of the fan is periodically adjusted in stages according to the refrigeration demand Q, when the refrigeration demand changes or is lower, the air supply temperature of the air conditioner cannot be overlooked due to instantaneous overshoot of the system, frequent starting and stopping of the compressor are reduced, the rotating speed of the fan can also be adjusted according to actual demands, an energy-saving state is kept, and both the control precision and the service life of the unit can be effectively improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a fan and a compressor in a refrigeration mode of an inverter air conditioner according to the present invention.
Fig. 2 is a table comparing the refrigeration demand Q with the output frequency of the compressor.
FIG. 3 is a table comparing cooling demand Q to target fan speed.
Reference numerals: compressor 1, fan 2, temperature sensor 3, evaporimeter 4, controller 5, expansion valve 6.
Detailed Description
The invention is further described with reference to the following examples.
The specific implementation of the fan and compressor control method in the refrigeration mode of the inverter air conditioner of the invention is illustrated by taking a more conventional inverter air conditioning system as an example as shown in fig. 1, wherein an indoor unit system comprises an evaporator 4, a compressor 1 and an expansion valve 6 which are sequentially communicated, the evaporator 4 is provided with a fan 2, and one side of the fan 2, at which air is discharged, is provided with a temperature sensor 3; the indoor unit system further comprises a controller 5, and the compressor 1, the fan 2, the temperature sensor 3 and the expansion valve 6 are respectively electrically connected with the controller 5 and controlled by the controller 5.
In the method for controlling a fan and a compressor in a refrigeration mode of a variable frequency air conditioner, step a includes setting a shutdown requirement W, setting a start requirement P, setting a maximum refrigeration requirement Qmax, setting a minimum refrigeration requirement Qmin, and calculating a refrigeration requirement Q, specifically, calculating the refrigeration requirement Q requires a detection value Td of a temperature sensor 3, a temperature control return difference value T β, a set temperature setting value Ts, and a temperature control precision Tc, and calculating the refrigeration requirement Q as follows:
step b, logically controlling the compressor according to the shutdown demand W, the start demand P and the refrigeration demand Q, please refer to FIG. 2, where FIG. 2 is a comparison table of the refrigeration demand Q and the output frequency of the compressor, and the control is as follows:
i. and when the refrigeration demand Q is less than the shutdown demand W, the compressor is closed.
And ii, when the shutdown demand W is less than or equal to the refrigeration demand Q < the system starting demand P, the compressor keeps the current state and the running frequency is unchanged.
And iii, when the system starting demand P is less than or equal to the refrigeration demand Q and less than 100%, please refer to FIG. 2, wherein FIG. 2 is a comparison table of the refrigeration demand Q and the output frequency of the compressor, the compressor is started, and the operation frequency of the compressor is increased along with the increase of the refrigeration demand Q or is reduced along with the reduction of the refrigeration demand Q.
And iii, when the refrigeration demand Q is more than or equal to 100%, the compressor keeps the highest frequency operation.
In the control of the compressor, after the compressor has been started, the compressor is operated at its starting frequency fzAnd after the operation is kept for 2min, the frequency is adjusted according to the refrigeration demand Q, and the minimum operation time of the compressor is not less than 6 min. Wherein the starting frequency fzA preferred value of (c) may be 50% of the highest frequency of the compressor.
Referring to fig. 3, fig. 3 is a graph illustrating a cooling demand Q and a target rotation speed of a fan, in this embodiment, the fan is controlled as follows: before any compressor of the multiple systems is started, the fan needs to be switched to the highest rotating speed of the fan to operate for at least 2S, timing is started after the compressor is started, and after the fan is started and operated for the maintaining time S1 (the optimal value is 5min), the fan operates according to the following logic: the maximum refrigeration demand Qmax and the minimum refrigeration demand Qmin are set.
i. When the refrigeration demand Q is larger than or equal to Qmax, the fan increases the rotating speed by a fan speed regulation step L, wherein the speed regulation step L (the speed regulation step L is the highest rotating speed/100 per second) can be set at will, and the rotating speed change in each demand calculation period
And until the rotating speed of the fan reaches the highest rotating speed, wherein T1 is the target rotating speed, T0 is the current rotating speed, M is the fan speed regulating ratio, and M is 5-20. The relationship between the target rotational speed of the fan and the refrigeration demand Q is shown in fig. 3; the target speed of the fan is adjusted in real time with the refrigeration demand Q, for example: the target rotating speed is adjusted in real time along with the refrigeration requirement. For example: and M is 5, the rotating speed of the fan is 2000 at the moment, the maximum rotating speed of the fan is 6000, the target rotating speed corresponding to the calculation Q is 3000, the speed regulating step length L is 6000/100, 60/second, the rotating speed change is (3000 + 2000)/5 is 200, the rotating speed of the fan only needs to reach 2200 within 10 seconds of the calculation period of the demand, the rotating speed is expected to reach the 4 th second of the calculation period, the rotating speed is kept 2200 for 6 seconds, the refrigerating demand Q is recalculated, and the fan and the compressor are linked to operate.
When the refrigerating demand Q is less than or equal to Qmin, the fan reduces the rotating speed by a fan speed regulating step length L (the speed regulating step length L is the highest rotating speed/100 per second), and the rotating speed change in each demand calculation period
And until the rotating speed of the fan reaches the lowest rotating speed, wherein T1 is the target rotating speed, T0 is the current rotating speed, M is the fan speed regulating ratio, and M is 5-20.
When the refrigeration demand Q is between Qmin and Qmax, the rotating speed of the fan is increased along with the increase of the refrigeration demand Q or decreased along with the decrease of the refrigeration demand Q until the rotating speed reaches the target rotating speed for operation, and the rotating speed in each demand calculation period is changed
Where T1 is the target rotation speed, T0 is the current rotation speed, M is the fan speed ratio, and M is 5-20, for example: each demand calculation period takes 10 s.
Suppose that: the temperature detected by the temperature sensor detection value Td is 33, the return air temperature set value Ts is set to 30, the refrigeration temperature return difference value T β is 2, the temperature control accuracy Tc is 0.89, and the refrigeration demand Q is:
due to refrigeration demand Q>100%, the system enters a refrigeration mode, and all parts operate according to the refrigeration mode.
According to the fan and the compressor control method under the refrigeration mode of the variable frequency air conditioner, the refrigeration demand Q is accurately calculated, so that the frequency of the compressor is periodically adjusted according to the refrigeration demand Q and the rotating speed of the fan is periodically adjusted according to the refrigeration demand Q in a step length mode, when the refrigeration demand changes or is low, the air supply temperature of the air conditioner cannot be suddenly raised or lowered due to instantaneous overshoot of the system, frequent starting and stopping of the compressor are reduced, the rotating speed of the fan can also be adjusted according to actual demands, an energy-saving state is kept, and both the control precision and the service life of a unit can be effectively improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A fan and compressor control method under the refrigeration mode of a frequency conversion air conditioner is characterized by comprising the following steps of a, setting a shutdown demand W, setting a starting demand P, setting a maximum refrigeration demand Qmax, setting a minimum refrigeration demand Qmin and calculating a refrigeration demand Q;
and b, respectively carrying out the following logic control on the fan and the compressor according to the refrigeration demand Q:
i. when the refrigeration demand Q is less than the shutdown demand W, the compressor is closed;
when the shutdown demand W is less than or equal to the refrigeration demand Q and less than the system starting demand P, the compressor keeps the current state and the running frequency is unchanged;
when the system starting demand P is less than or equal to the refrigeration demand Q and less than 100 percent, the compressor is started, and the running frequency of the compressor is increased along with the increase of the refrigeration demand Q or is reduced along with the reduction of the refrigeration demand Q;
when the refrigeration demand Q is more than or equal to 100%, the compressor keeps the highest frequency operation;
when any compressor is started, the fan needs to be switched to the highest rotating speed of the fan to operate for at least 2S, timing is started after the compressor is started, and the fan operates according to the following logic after the fan is started for maintaining time S1:
i. when the refrigeration demand Q is larger than or equal to Qmax, the fan increases the rotating speed by the fan speed regulation step length L, and the rotating speed change in each demand calculation period
Until the rotating speed of the fan reaches the highest rotating speed, wherein T1 is a target rotating speed, T0 is a current rotating speed, and M is a fan speed regulating ratio;
when the refrigeration demand Q is less than or equal to Qmin, the fan reduces the rotating speed by the fan speed regulation step length L, and the rotating speed change in each demand calculation period
Until the rotating speed of the fan reaches the lowest rotating speed, wherein T1 is a target rotating speed, T0 is a current rotating speed, and M is a fan speed regulating ratio;
when the refrigeration demand Q is between Qmin and Qmax, the rotating speed of the fan is increased along with the increase of the refrigeration demand Q or decreased along with the decrease of the refrigeration demand Q until the rotating speed reaches the target rotating speed for operation, and the rotating speed in each demand calculation period is changed
Wherein T1 is the target rotation speed, and T0 is whenAnd the front rotating speed and M are fan speed regulating ratios.
2. The method for controlling the fan and the compressor in the refrigeration mode of the inverter air conditioner according to claim 1, wherein the method comprises the following steps: in step a, the refrigeration demand Q is calculated as follows from the temperature sensor detection value Td, the temperature control return difference value T β, the set temperature set value Ts, and the temperature control accuracy Tc:
3. the method for controlling the fan and the compressor in the refrigeration mode of the inverter air conditioner according to claim 1, wherein the method comprises the following steps: in the step b, after the compressor is started, the compressor keeps running for 2min at the starting frequency fz, then the frequency is adjusted according to the refrigeration requirement Q, and the minimum running time of the compressor is not less than 6 min.
4. The method for controlling the fan and the compressor in the refrigeration mode of the inverter air conditioner according to claim 1, wherein the method comprises the following steps: in step b, the fan start-up maintaining time S1 is 5 min.
5. The method for controlling the fan and the compressor in the refrigeration mode of the inverter air conditioner according to claim 4, wherein the method comprises the following steps: in step b, each demand calculation period is 10s-20 s.
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| CN110779171B (en) * | 2019-10-31 | 2021-11-05 | 广东海悟科技有限公司 | Air source heat pump unit control method, electronic equipment and computer readable storage medium |
| CN112856748B (en) * | 2021-01-21 | 2021-11-09 | 深圳市英威腾网能技术有限公司 | Cold output control method and device, machine room air conditioner and storage medium |
| CN114264029A (en) * | 2021-11-19 | 2022-04-01 | 科华数据股份有限公司 | Method for controlling air conditioner, air conditioner and storage medium |
| CN115143611B (en) * | 2022-07-22 | 2024-07-05 | 广东欧科空调制冷有限公司 | Distribution control method and system for multi-connected air conditioner combined module system |
| CN116208031A (en) * | 2023-03-03 | 2023-06-02 | 湖北惠洋电器制造有限公司 | BLDC motor rotating speed control method |
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