CN115654646A - Control method and control device of air conditioner and air conditioner - Google Patents
Control method and control device of air conditioner and air conditioner Download PDFInfo
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Abstract
The invention relates to an air conditioner control method, an air conditioner control device and an air conditioner. The control method comprises the following steps: in a refrigeration mode, the running time of the compressor when the indoor environment temperature reaches the shutdown temperature is judged in advance; comparing the running time of the compressor with a set value of the running time of the compressor to judge whether the indoor heat load is in a low-load condition; if yes, switching to a low-load refrigeration mode; and in the low-load refrigeration mode, the rotating speed of the indoor fan is reduced according to the running time of the compressor so as to reduce the refrigerating capacity of the air conditioner. Under the condition of low load, the invention takes the running time of the compressor reaching the shutdown temperature point as a control target, reduces the refrigerating capacity of the fixed-frequency compressor by reducing the rotating speed of the inner fan, and prolongs the running time of the compressor, thereby solving the problem of frequent start and stop of the fixed-frequency compressor in a machine room.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method and a control device of an air conditioner and the air conditioner.
Background
The IT equipment of the data center machine room runs uninterruptedly, and the air conditioner of the machine room is required to run uninterruptedly and stably for 365 days and 24 hours. Even in winter, the corresponding refrigeration needs to be supplied, so the heat load difference of the equipment in the machine room is large.
The variable frequency compressor adapts to different heat load refrigeration requirements by adjusting the frequency, and can meet the heat load change requirement of a machine room. However, the price of the inverter compressor is high, the inverter driving circuit is complex, and the reliability and EMC performance are difficult to meet the requirements, so that the data center and the machine room still use the constant-frequency compressor machine room air conditioner with high reliability, long service life and low price.
The temperature change of the machine room is large all the year round, when the outside temperature is low or the IT equipment operation quantity is small, the heat load of the machine room is small, and the refrigerating capacity of the machine room air conditioner is obviously higher than that of the machine room. When T (T) is not less than T set The compressor is cooled and operated at + Tm, the heat load is quickly removed, and the temperature of the machine room is quickly reduced to T set Below Tm, the compressor stops cooling. The heat productivity of IT equipment causes the temperature of a machine room to rise to T set Above + Tm, the compressor starts, and such circulation causes frequent start and stop of the compressor, which is not favorable for long-term operation reliability of the compressor.
The related technology discloses a method for controlling a fixed-frequency air conditioner without stopping, which adjusts the operation quantity of indoor heat exchangers and outdoor heat exchangers and the operation quantity of indoor fans and outdoor fans according to heat load.
Disclosure of Invention
In view of the above, the invention discloses a control method and a control device for an air conditioner and the air conditioner, which are used for solving the problem that a fixed-frequency compressor is frequently started and stopped under the condition of low load of a machine room.
In order to solve the above technical problems, a first aspect of the present invention provides a control method for an air conditioner, the air conditioner includes a compressor, the compressor is a fixed-frequency compressor, the air conditioner is provided with a cooling mode and a low-load cooling mode, the control method includes:
predicting an indoor ring in a cooling modeCompressor run time t when ambient temperature reaches shutdown temperature run_cal ；
Running the compressor for a time t run_cal With compressor run time setpoint t run_Set Comparing to judge whether the indoor heat load is a low-load condition;
if yes, switching to a low-load refrigeration mode;
in the low-load refrigeration mode, according to the compressor running time t run_cal The rotating speed of the indoor fan is reduced to reduce the refrigerating capacity of the air conditioner.
Further optionally, the compressor running time t when the indoor ambient temperature reaches the shutdown temperature is predicted run_cal The method comprises the following steps:
after the compressor runs for a first preset time, calculating the temperature reduction rate of the indoor environment temperature;
predicting compressor run time t based on temperature ramp down rate run_cal 。
Further alternatively, the compressor operation time t is calculated using the following formula run_cal ：
Ec(t)＝(T(t2)-T(t))/(t-t2)；
t run_cal ＝t+(T(t)-(T set -Tm))/Ec(t)；
Where Ec (T) represents the temperature decrease rate at time T, T (T2) represents the indoor ambient temperature at time T2, T (T) represents the indoor ambient temperature at time T, T set The temperature indicates the indoor set temperature, and Tm indicates the temperature accuracy.
Further optionally, running the compressor for a time t run_cal With compressor run time setpoint t run_Set Comparing to determine whether the indoor thermal load condition is low, comprising:
judging t run_cal Whether or not t is satisfied run_cal ＜a×t run_Set ；
If yes, judging that the indoor heat load is in a low-load condition;
wherein a is a coefficient, a is more than 0 and less than 1, t run_Set Indicating a compressor run time set point.
Further optionallyAccording to the compressor running time t run_cal Reduce indoor fan rotational speed, include:
judging whether T (T) satisfies T (T) less than or equal to T set + k × Tm, where T (T) represents the indoor ambient temperature at time T, tm represents temperature accuracy, k is a coefficient, 0 < k < 1;
if yes, judging the running time t of the compressor run_cal The range in which it is located;
and reducing the rotating speed of the indoor fan to different degrees according to different ranges.
Further optionally, the rotating speed of the indoor fan is reduced to different degrees according to different ranges, including:
when t is run_cal ＜a×t run_Set When the indoor fan is started, reducing the rotating speed of the indoor fan by a first regulating quantity;
when t is run_cal ＜b×t run_Set When the indoor fan is started, reducing the rotating speed of the indoor fan by a second regulating quantity;
wherein a is more than 0 and less than b and less than 1, and the first regulating quantity is more than the second regulating quantity.
Further optionally, the control method further includes:
judging whether the reduced rotating speed of the indoor fan is less than or equal to a first preset wind speed or not;
if yes, adjusting the opening of the electronic expansion valve according to the first target superheat degree;
if not, adjusting the opening of the electronic expansion valve by using a second target superheat degree;
wherein the first target superheat degree is greater than the second target superheat degree.
Further optionally, after adjusting the opening of the electronic expansion valve, the control method further includes:
judging whether the indoor environment temperature is less than or equal to the shutdown temperature;
if yes, the compressor is controlled to stop, and the rotating speed of the indoor fan is kept to be operated at the current rotating speed.
Further optionally, after the compressor is stopped and restarted, the control method further comprises:
prejudging the running time t 'of the compressor when the indoor environment temperature reaches the shutdown temperature' run_cal ；
Judging t' run_cal Whether or not t 'is satisfied' run_cal ≥c×t run_Set ，c＞1；
If so, increasing the rotating speed of the indoor fan by the third regulating quantity so as to increase the refrigerating capacity of the air conditioner.
Further optionally, characterized by, if t' run_cal T 'is not satisfied' run_cal ≥c×t run_Set And c is more than 1, and the control method further comprises the following steps:
judging whether the rotating speed of the indoor fan is greater than or equal to a second preset wind speed or not;
if not, judging the range of the rotating speed of the indoor fan;
acquiring a corresponding target superheat degree according to the range of the rotating speed of the indoor fan;
and adjusting the opening of the electronic expansion valve according to the target superheat degree.
Further optionally, the obtaining of the corresponding target superheat degree according to the range of the rotating speed of the indoor fan includes:
when the rotating speed of the indoor fan is greater than the first preset wind speed and less than the second preset wind speed, the target superheat degree is a second target superheat degree;
when the rotating speed of the indoor fan is smaller than or equal to a first preset wind speed, the target superheat degree is a first target superheat degree.
Further optionally, when the rotating speed of the indoor fan is judged to be greater than or equal to the second preset wind speed, the cooling mode is switched.
Further optionally, the control method further includes:
judging whether the indoor environment temperature is less than or equal to the shutdown temperature;
if yes, the compressor is controlled to stop, and the indoor fan keeps running at the current rotating speed.
A second aspect of the present invention provides a control apparatus for an air conditioner, comprising one or more processors and a non-transitory computer-readable storage medium storing program instructions, the one or more processors being configured to implement the method of any one of the first aspects when the program instructions are executed by the one or more processors.
A third aspect of the invention provides an air conditioner using the method of any one of the first aspect or comprising the control device of the second aspect.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
under the condition of low load, the invention takes the running time of the compressor reaching the stop temperature point as a control target, reduces the refrigerating capacity of the fixed-frequency compressor by reducing the rotating speed of the inner fan, and prolongs the running time of the compressor, thereby solving the problem of frequent start and stop of the fixed-frequency compressor in a machine room.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, 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 without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 illustrates a flowchart of a control method of an air conditioner according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In the description of the present invention, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to solve the problem that the fixed-frequency compressor of the machine room is frequently started and stopped, the embodiment provides the control method of the air conditioner, the refrigerating capacity of the compressor can be dynamically adjusted under the low-load condition, the frequent starting and stopping of the compressor are avoided, the reduction of the indoor temperature fluctuation of the machine room is facilitated, and the service life of the compressor is prolonged.
Specifically, the air conditioner comprises a compressor and an indoor fan, wherein the compressor is a fixed-frequency compressor, the indoor fan is preferably a direct current brushless motor (EC fan), and the air conditioner is provided with a refrigeration mode and a low-load refrigeration mode.
The following describes a control method of the air conditioner according to the present embodiment with reference to the drawings.
Referring to the flow chart of fig. 1, the control method includes S1 to S4, where:
s1, in the refrigeration mode, the running time t of the compressor when the indoor environment temperature reaches the shutdown temperature is judged in advance run_cal ；
S2, running time t of the compressor run_cal With compressor run time setpoint t run_Set Comparing to judge whether the indoor heat load is a low-load condition; if yes, executing S3;
s3, switching to a low-load refrigeration mode;
s4, in the low-load refrigeration mode, according to the running time t of the compressor run_cal The rotating speed of the indoor fan is reduced to reduce the refrigerating capacity of the air conditioner.
Normal refrigeration control mode of the machine room air conditioner: when the indoor environment temperature T (T) is more than or equal to T set And + Tm, starting the compressor, keeping the rotating speed of the inner fan unchanged, keeping the initial opening degree of the electronic expansion valve at 200, and gradually stabilizing the refrigeration system after 3 minutes. The electronic expansion valve is adjusted according to the suction superheat degree every 1 minute: Δ U (T) = T evaporation-T into-SH target, SH target =2 ℃. The rotating speed of the inner fan is deviated from the set temperature according to the indoor environment e (T) = T (T) -T set And delta E (T) = e (T) -e (T-1) = T (T) -T (T-1) indoor environment temperature change at the front time and the rear time for incremental PID adjustment, wherein delta R (T) = KP delta e (T) + KIe (T) + KD [ [ delta e (T) - [ delta e (T-1) ]]. The rotating speed of the outdoor condensing fan is adjusted according to the condensing pressure, and the reasonable condensing pressure is kept.
When T (T) is less than or equal to T set And when Tm reaches a shutdown temperature point and the minimum running time of the compressor is up to 6 minutes, the compressor is turned off, the inner fan keeps the current rotating speed, indoor air convection is maintained, the heat productivity of IT equipment in the machine room is blown away, and the IT equipment is prevented from generating local hot spots.
In this embodiment, in the normal refrigeration process of the air conditioner in the machine room, preferably, after the refrigeration system is gradually stabilized, the operation time of the compressor when the indoor environment temperature reaches the shutdown temperature is pre-determined, the operation time of the compressor is used for determining the condition of the indoor thermal load, and when the indoor thermal load is low, the operation time trun _ cal of the compressor is used as a control target, the refrigeration capacity of the compressor is reduced by reducing the rotating speed of the inner fan, the operation time of the compressor is prolonged, and therefore the frequent start and stop of the fixed-frequency compressor in the machine room can be avoided.
Refrigerating capacity = Q of air conditioner in machine room m C pa (h a1 －h a2 )/V' n (1+W n )；
Wherein Q is m Air volume h a1 : enthalpy of return air, h a2 : air enthalpy, V 'of ventilation' n : specific heat capacity of humid air at nozzle, W n : wet air moisture content at the nozzle. The refrigerating capacity is the product of air quantity and enthalpy difference, so that the rotating speed of the internal fan is reduced,the air quantity is reduced, and the refrigerating capacity can be effectively reduced.
Further alternatively, in conjunction with the flow chart of fig. 2, the compressor operation time t when the indoor ambient temperature reaches the shutdown temperature is predicted in step S1 run_cal Comprising S11 to S12, wherein:
s11, calculating the temperature reduction rate of the indoor environment temperature after the compressor runs for a first preset time;
s12, pre-judging the running time t of the compressor according to the temperature reduction rate run_cal 。
After the compressor runs for the first preset time, the refrigerating system is gradually stabilized, the temperature drop rate of the indoor environment temperature is calculated at the moment, and the calculation result is more accurate. On the basis of the above, the compressor running time t when the indoor ambient temperature reaches the shutdown temperature is calculated run_cal And the calculation result is more accurate. The first preset time period is generally 3-6min, and preferably 3min in the embodiment.
Further alternatively, the compressor operation time t is calculated using the following formula run_cal ：
Ec(t)＝(T(t2)-T(t))/(t-t2)；
Wherein, T (T2) represents the indoor environment temperature at the time T2, T (T) represents the indoor environment temperature at the time T, ec (T) represents the temperature decrease rate at the time T, which is a positive value representing a temperature decrease, which is a negative value representing a temperature increase, in units of ℃/min;
t run_cal ＝t+(T(t)-(T set -Tm))/Ec(t)；
wherein, T set Represents an indoor set temperature, i.e., a user set temperature; tm represents temperature accuracy, and in the present embodiment, the value range thereof is preferably: greater than or equal to 1 ℃ and less than or equal to 5 ℃.
When the indoor heat load is low, the temperature drops quickly, the temperature change rate Ec is quick, so the compressor running time calculated value t run_cal Is small. When the indoor heat load becomes large, the temperature drop is slow, the temperature change rate Ec (t) is slow, and the compressor operation time calculated value t run_cal Is large. Thus by calculating the compressor run time t to the shutdown temperature run_cal And compressor run time setpoint t run_Set In comparison, the level of the indoor heat load can be determined. When the indoor heat load is lower, the refrigerating capacity of the air conditioner in the machine room is reduced, the temperature change rate Ec can be reduced, the refrigerating operation time of the compressor is prolonged, and therefore frequent starting and stopping of the fixed-frequency air conditioner in the machine room are avoided.
Further optionally, with reference to the flowchart of fig. 2, step S2 includes S21 to S22, where:
s21, judging t run_cal Whether or not t is satisfied run_cal ＜a×t run_Set (ii) a If yes, executing S22;
s22, judging that the indoor heat load is in a low-load condition;
wherein a is a coefficient, a is more than 0 and less than 1, t run_Set Representing the compressor run time set point.
Specifically, when t is run_cal Satisfy t run_cal ＜a×t run_Set When the indoor heat load is a low-load condition, the refrigerating capacity of the air conditioner in the machine room is reduced, the temperature change rate Ec can be reduced, and the refrigerating operation time of the compressor is prolonged.
Specifically, in order to ensure that the heat productivity of IT equipment is removed quickly, the air conditioner of the machine room is designed according to high indoor heat load, and the speed regulation range of the rotating speed of an indoor fan is 80-100% during normal refrigeration control. When the indoor heat load is low, the rotating speed of the indoor fan is reduced to 40% -70%, the refrigerating capacity can be effectively reduced, and the refrigerating operation time of the compressor is prolonged, so that the compressor is prevented from being started and stopped frequently.
Further alternatively, in conjunction with the flow diagram of fig. 2, the operation time t of the compressor is determined in step S4 run_cal Reducing the rotating speed of an indoor fan, comprising S41-S43, wherein:
s41, judging whether T (T) meets the condition that T (T) is less than or equal to T set + k × Tm; if yes, executing S42;
wherein T (T) represents the indoor environment temperature at the time T, tm represents the temperature precision, k is a coefficient, and k is more than 0 and less than 1;
s42, judging the running time t of the compressor run_cal The range in which it is located;
and S43, reducing the rotating speed of the indoor fan to different degrees according to different ranges.
The air conditioner in the machine room requires that the environmental temperature is controlled within the temperature precision range [ Tset-Tm, tset + Tm ], and the rotating speed of the inner fan is not reduced before the Tset + kXTm is reached, so that the requirement of quick cooling of the machine room is met.
Further optionally, with reference to the flowchart of fig. 2, taking two ranges as examples, S42 includes S421 to S422, where:
s421, when t is run_cal ＜a×t run_Set When the indoor fan is started, reducing the rotating speed of the indoor fan by a first regulating quantity;
s422, when t is run_cal ＜b×t run_Set When the indoor fan is started, reducing the rotating speed of the indoor fan by a second regulating quantity;
wherein a is more than 0 and less than b and less than 1 run_Set Representing a compressor run time setpoint, the first adjustment amount being greater than the second adjustment amount.
Specifically, in conjunction with the flow diagram of FIG. 3, a is preferably 0.5, b is preferably 0.75, when t is run_cal <0.5t run_Set The indoor heat load is very small, and the rotating speed of the inner fan is reduced by 20 percent; for example, the current inner fan rotating speed is reduced to 60 percent when 80 percent of the current inner fan rotating speed is reached, and when t is reached run_cal <0.75t run_Set The indoor heat load is small, and the rotating speed of the inner fan is reduced by 10 percent; for example, the current inner fan rotation speed is 80%, the current inner fan rotation speed is reduced to 70%, the cooling capacity ↓, the temperature change rate ↓, t run_cal ↑, compressor run time will be greater than 0.75t run_Set Thus lengthening the compressor run time.
Further optionally, with reference to the flowchart of fig. 2, the control method further includes S51 to S53, where:
s51, judging whether the reduced rotating speed of the indoor fan is less than or equal to a first preset wind speed or not; if yes, executing S52, if not, executing S53;
s52, adjusting the opening of the electronic expansion valve according to the first target superheat degree;
s53, adjusting the opening degree of the electronic expansion valve at a second target superheat degree;
wherein the first target superheat degree is greater than the second target superheat degree.
In this embodiment, when the electronic expansion valve adjusts its opening according to the suction superheat, its control principle is the same as that in the conventional refrigeration mode, that is, the electronic expansion valve adjusts according to the suction superheat at intervals (for example, one minute): Δ U (T) = T Evaporate out -T Is evaporated into -SH Target . Specifically, when the indoor fan rotation speed is less than or equal to the first preset wind speed, i.e. when the indoor fan rotation speed is low (generally 40% -70%), the target superheat degree is increased, and at this time, SH is preferably selected Target =5 ℃, so that the opening increment of the electronic expansion valve can be reduced, the refrigerant flow is reduced, the refrigerant sucked by the compressor is reduced, the power consumption of the compressor is reduced, and the refrigerating capacity is also reduced. On the contrary, when the rotating speed of the indoor fan is greater than the first preset wind speed, the target superheat degree does not need to be increased, the original target superheat degree is used for adjustment, and at the moment, SH is preferably selected Target ＝2℃。
Further optionally, with reference to the flowchart of fig. 2, the control method further includes S6 to S7, where:
s6, judging whether the indoor environment temperature is less than or equal to the shutdown temperature; if yes, executing S7;
and S7, controlling the compressor to stop, and keeping the rotating speed of the indoor fan to be in the current rotating speed operation.
When the monitored T (T) is less than or equal to T set And when the Tm reaches a shutdown temperature point, the compressor is turned off, the indoor fan keeps the current rotating speed, indoor air convection is maintained, the heat productivity of the IT equipment in the machine room is blown away, and the IT equipment is prevented from generating local hot spots.
Further optionally, with reference to the flowchart of fig. 2, after the compressor is stopped and restarted, the control method further includes S81 to S83, where:
s81, judging the running time t 'of the compressor when the indoor environment temperature reaches the shutdown temperature in advance' run_cal ；
S82, judging t' run_cal Whether or not to satisfy t' run_cal ≥c×t run_Set C > 1; if yes, executing S83;
and S83, increasing the rotating speed of the indoor fan by a third adjustment amount to increase the refrigerating capacity of the air conditioner.
Specifically, after the air conditioner enters low-load refrigeration control, under the condition that the indoor heat load is increased: the compressor is restarted, the refrigerating system is gradually stabilized after 3 minutes, the temperature reduction rate is calculated, and the stop temperature (T) is calculated set -Tm) compressor run time t run_cal T =6 minutes was selected for the judgment. When t is run_cal ≥1.5t run_Set The indoor heat load is obviously higher than the current refrigerating capacity, and the rotating speed of the indoor fan is increased by a third increment, for example, the rotating speed of the indoor fan is increased by 10%, so that the refrigerating capacity is immediately increased, and the situation that the temperature control precision range is not reached for a long time is avoided. When t is run_cal <1.5t run_Set And the indoor fan maintains the current control, the rotating speed of the inner fan is automatically increased through the increment PID adjustment of the inner fan, and the refrigerating capacity is improved.
Further optionally, referring to the schematic flow chart of FIG. 2, if' run_cal T 'is not satisfied' run_cal ≥c×t run_Set And c is more than 1, the control method further comprises S91-S94, wherein:
s91, judging whether the rotating speed of the indoor fan is greater than or equal to a second preset wind speed; if not, executing S92;
s92, judging the range of the rotating speed of the indoor fan;
s93, acquiring a corresponding target superheat degree according to the range of the rotating speed of the indoor fan;
and S94, adjusting the opening of the electronic expansion valve according to the target superheat degree.
Further optionally, with reference to the flowchart of fig. 4, taking two ranges as examples, S93 includes S931 to S932, where:
s931, when the rotating speed of the indoor fan is larger than a first preset wind speed and smaller than a second preset wind speed, the corresponding target superheat degree is a second target superheat degree;
s931, when the rotating speed of the indoor fan is smaller than or equal to a first preset air speed, the corresponding target superheat degree is a first target superheat degree;
the first target superheat is greater than the second target superheat.
Specifically, the electronic expansion valve is adjusted at every 1 minute according to the suction superheat degree: Δ U (T) = T Evaporate out -T Is evaporated into -SH Target When the rotating speed of the indoor fan is less than or equal to a first preset wind speed, namely the rotating speed of the indoor fan is lower (generally 40-70%), the target superheat SH is improved Target =5 ℃, the opening increment of the expansion valve is reduced, the refrigerant flow is reduced, and the refrigerant sucked by the compressor is reduced, so the power consumption of the compressor is reduced, and the cooling capacity is also reduced. On the contrary, when the rotating speed of the indoor fan is greater than the first preset wind speed and less than the second preset wind speed, the SH is Target ＝2℃。
Further optionally, when the rotating speed of the indoor fan is judged to be greater than or equal to the second preset wind speed, the cooling mode is switched.
Referring to the flow diagram of fig. 4, if the rotation speed of the indoor fan is greater than or equal to 90%, it indicates that the indoor heat load is very high, and the normal refrigeration control mode is resumed. In the normal refrigeration control mode, the opening degree of the electronic expansion valve is preferably adjusted at the second target superheat degree of 2 ℃.
Further optionally, the control method further includes:
judging whether the indoor environment temperature is less than or equal to the shutdown temperature;
if so, the compressor is controlled to stop, and the current indoor fan rotating speed is kept unchanged.
When the monitored T (T) is less than or equal to T set And when the Tm reaches a shutdown temperature point, the compressor is turned off, the inner fan keeps the current rotating speed, indoor air convection is maintained, the heat productivity of the IT equipment in the machine room is blown away, and the IT equipment is prevented from generating local hot spots.
In a second embodiment of the present invention, a control device for an air conditioner is provided, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, where the program instructions are executed by the one or more processors, and the one or more processors are configured to implement the method of any one of the first embodiments.
In an embodiment of a third aspect of the present invention, there is provided an air conditioner that employs the method of any one of the embodiments of the first aspect, or includes the control apparatus of the embodiment of the second aspect.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various embodiments or some parts of the embodiments.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (15)
1. A control method of an air conditioner is characterized in that the air conditioner comprises a compressor, the compressor is a fixed-frequency compressor, the air conditioner is provided with a refrigeration mode and a low-load refrigeration mode, and the control method comprises the following steps:
predicting a compressor operation time t when an indoor ambient temperature reaches a shutdown temperature in the cooling mode run_cal ；
Running the compressor for a time t run_cal With compressor run time setpoint t run_Set Comparing to judge whether the indoor heat load is a low-load condition;
if yes, switching to the low-load refrigeration mode;
in the low-load refrigeration mode, according to the compressor running time t run_cal And reducing the rotating speed of the indoor fan so as to reduce the refrigerating capacity of the air conditioner.
2. Control method according to claim 1, characterized in that the compressor running time t when the indoor ambient temperature reaches the shutdown temperature is pre-determined run_cal The method comprises the following steps:
after the compressor runs for a first preset time, calculating the temperature drop rate of the indoor environment temperature;
predicting the compressor running time t according to the temperature drop rate run_cal 。
3. Control method according to claim 2, characterized in that the compressor running time t is calculated using the formula run_cal ：
Ec(t)＝(T(t2)-T(t))/(t-t2)；
t run_cal ＝t+(T(t)-(T set -Tm))/Ec(t)；
Where Ec (T) represents the temperature decrease rate at time T, T (T2) represents the indoor ambient temperature at time T2, T (T) represents the indoor ambient temperature at time T, T set The temperature indicates the indoor set temperature, and Tm indicates the temperature accuracy.
4. Control method according to claim 1, characterized in that the compressor is run for a time t run_cal And compressor run time set point t run_Set Comparing to judge whether the indoor heat load is a low load condition, comprising:
judging t run_cal Whether or not t is satisfied run_cal ＜a×t run_Set ；
If yes, judging that the indoor heat load is in a low-load condition;
wherein a is a coefficient, a is more than 0 and less than 1, t run_Set Representing the compressor run time set point.
5. Control method according to claim 1, characterized in that the compressor run time t is dependent on run_cal Reduce indoor fan rotational speed, include:
judging whether T (T) satisfies T (T) less than or equal to T set + k × Tm, where T (T) represents the indoor ambient temperature at time T, tm represents temperature accuracy, k is a coefficient, 0 < k < 1;
if yes, judging the running time t of the compressor run_cal The range in which it is located;
and reducing the rotating speed of the indoor fan to different degrees according to different ranges.
6. The control method of claim 5, wherein reducing the indoor fan speed to different degrees according to different ranges comprises:
when t is run_cal ＜a×t run_Set When the indoor fan is started, reducing the rotating speed of the indoor fan by a first regulating quantity;
when t is run_cal ＜b×t run_Set When the indoor fan is started, reducing the rotating speed of the indoor fan by a second regulating quantity;
wherein a is more than 0 and less than b and less than 1, and the first regulating quantity is more than the second regulating quantity.
7. The control method according to claim 1, characterized by further comprising:
judging whether the reduced rotating speed of the indoor fan is less than or equal to a first preset wind speed or not;
if yes, adjusting the opening of the electronic expansion valve according to the first target superheat degree;
if not, adjusting the opening of the electronic expansion valve by using a second target superheat degree;
wherein the first target degree of superheat is greater than the second target degree of superheat.
8. The control method according to any one of claims 1 to 7, characterized by further comprising:
judging whether the indoor environment temperature is less than or equal to the shutdown temperature;
if yes, the compressor is controlled to stop, and the indoor fan keeps running at the current rotating speed.
9. The control method according to claim 8, further comprising, after the compressor is stopped and restarted:
prejudging the running time t 'of the compressor when the indoor environment temperature reaches the shutdown temperature' run_cal ；
Judging t' run_cal Whether or not t 'is satisfied' run_cal ≥c×t run_Set ，c＞1；
And if so, increasing the rotating speed of the indoor fan by a third regulating quantity so as to increase the refrigerating capacity of the air conditioner.
10. Control method according to claim 9, characterized in that if t' run_cal T 'is not satisfied' run_cal ≥c×t run_Set And c is greater than 1, the control method further comprises the following steps:
judging whether the rotating speed of the indoor fan is greater than or equal to a second preset wind speed or not;
if not, judging the range of the rotating speed of the indoor fan;
acquiring a corresponding target superheat degree according to the range of the rotating speed of the indoor fan;
and adjusting the opening of the electronic expansion valve according to the target superheat degree.
11. The control method according to claim 10, wherein obtaining the corresponding target superheat degree according to the range of the indoor fan rotation speed includes:
when the rotating speed of the indoor fan is larger than a first preset wind speed and smaller than a second preset wind speed, the corresponding target superheat degree is a second target superheat degree;
and when the rotating speed of the indoor fan is less than or equal to the first preset wind speed, the target superheat degree is a first target superheat degree.
12. The control method according to claim 10, characterized in that when it is determined that the indoor fan rotation speed is greater than or equal to the second preset wind speed, the mode is switched to the cooling mode.
13. The control method according to claim 9, characterized by further comprising:
judging whether the indoor environment temperature is less than or equal to the shutdown temperature;
if yes, the compressor is controlled to stop, and the indoor fan keeps running at the current rotating speed.
14. A control apparatus of an air conditioner, characterized in that it comprises one or more processors and a non-transitory computer-readable storage medium storing program instructions, which when executed by the one or more processors, are configured to implement the method according to any one of claims 1 to 13.
15. An air conditioner characterised in that it employs the method of any one of claims 1 to 13 or includes the control apparatus of claim 14.
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| CN116123638A (en) * | 2023-03-29 | 2023-05-16 | 浙江中广电器集团股份有限公司 | Heat pump air conditioner and operation control method thereof |
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