WO2021169060A1

WO2021169060A1 - Method for controlling air-cooling module unit

Info

Publication number: WO2021169060A1
Application number: PCT/CN2020/091308
Authority: WO
Inventors: 马东; 赵雷; 孙辉
Original assignee: 青岛海尔中央空调有限公司; 海尔智家股份有限公司
Priority date: 2020-02-28
Filing date: 2020-05-20
Publication date: 2021-09-02
Also published as: CN113324318B; CN113324318A

Abstract

Provided is a method for controlling an air-cooling module unit. The air-cooling module unit comprises a plurality of module machines that are arranged in parallel and can be connected to a plurality of tail ends. The control method comprises: inputting a designed water output temperature To, a target water output temperature Tset, a designed ambient temperature Te, the total number N of module machines and the total number M of tail ends of an air-cooling module unit; measuring a real-time ambient temperature Te' of the air-cooling module unit, and determining the number M' of tail ends that are turned-on in real time; calculating a real-time capacity attenuation coefficient L of the air-cooling module unit on the basis of the designed water output temperature To, the target water output temperature Tset, the designed ambient temperature Te and the real-time ambient temperature Te'; calculating a real-time load F of the air-cooling module unit on the basis of the real-time capacity attenuation coefficient L, the total number M of tail ends and the number M' of tail ends that are turned-on in real time; on the basis of the real-time load F and the total number N of module machines, calculating the number N' of module machines that are turned-on; and starting the module machines on the basis of the calculated number N' of module machines that are turned-on. Not only can the technical problems of large fluctuations of a water output temperature of an air-cooling module unit and a reduction in the energy efficiency of the unit be solved, the frequent starting-stopping of the unit can also be avoided.

Description

Control method of air-cooled modular unit

Priority claim

This application claims the priority rights of a Chinese invention patent application filed on February 28, 2020, with the title of "Control Method for Air-cooled Module Units" and the Application Number "202010130038.6", the entire content of which is incorporated into this application by reference middle.

Technical field

The invention relates to a control method of a central air-conditioning system, in particular to a control method of an air-cooled modular unit.

Background technique

Air-cooled modular units generally refer to central air-conditioning equipment based on modular technology, using air as the cold (heat) medium and as both cold (heat) sources. Air-cooled modular units can be divided into single-cooling type and heat pump type air-cooled modular units. Single refrigeration type and heat pump type air-cooled modular units are usually composed of multiple air-cooled modular units (hereinafter referred to as "module units") connected in parallel and can be connected to multiple air conditioners or user terminals (hereinafter referred to as "terminals") in order to be able to Realize large area cooling and/or heating needs. Each modular machine contains an independent refrigeration system, that is, each has a compressor, a condenser, an evaporator and an expansion device. Therefore, any abnormal situation in any refrigeration circuit will not affect the normal operation of other refrigeration circuits, thereby ensuring the relatively stable working performance of the unit.

In the prior art, the start and stop of the air-cooled modular unit with multiple interconnected modular units are controlled according to the outlet water temperature, and the load change is not effectively considered. When the load of the air-cooled module unit is small, the temperature of its outlet water will fluctuate relatively greatly. Therefore, only controlling the air-cooled module unit based on the outlet water temperature will not only cause frequent start and stop of the unit, but also reduce the energy efficiency of the unit, and the frequent start and stop of the unit will also affect the reliability of the compressor.

Correspondingly, a new technical solution is needed in this field to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problems of large fluctuations in the outlet water temperature and low energy efficiency of the air-cooled module unit when the load is small, the present invention provides a control method of the air-cooled module unit. The modular unit includes multiple parallel modular computers and can be connected to multiple terminals, and the control method includes:

Input the design outlet temperature To, target outlet temperature Tset, and design ambient temperature Te of the air-cooled module unit, the total number N of the module units, and the total number M of the terminals;

Measure the real-time ambient temperature Te' of the air-cooled module unit and determine the real-time opening quantity M'of the terminal;

Calculate the real-time capacity attenuation coefficient L of the air-cooled module unit based on the design water temperature To, the target water temperature Tset, the design ambient temperature Te, and the real-time ambient temperature Te';

Calculate the real-time load F of the air-cooled module unit based on the real-time capacity attenuation coefficient L, the total number M of the terminals, and the real-time opening number M';

Based on the real-time load F and the total number N of the modular computers, calculate the number of openings N'of the modular computers; and

The modular machine is activated based on the calculated opening number N'.

In the above-mentioned preferred technical solution of the control method of the air-cooled modular unit, in the step of starting the modular machine based on the calculated opening number N', it further includes the following steps:

Compare the calculated opening number N'with the total number N of said modular machines;

When the calculated opening number N'is less than the total number N of the modular machines, start the modular machines one by one according to the calculated opening number N'; and

When the calculated opening number N'is greater than or equal to the total number N of the modular machines, all the modular machines are started one by one.

In the preferred technical solution of the control method of the above-mentioned air-cooled modular unit, after the modular units are started one by one according to the calculated opening number N', the control method further includes:

Analyzing _{the operation} of the operation time T cooled module unit exceeds a first predetermined period Tp1 of;

If the run time T _run does not exceed a first predetermined period Tp1, the module continues to run at the calculated opening amount N 'operation; and

If the operating time T _runs beyond the first predetermined time period Tp1, the real-time capacity attenuation coefficient L'and the real-time load F'are recalculated, and based on the recalculated real-time capacity attenuation coefficient L'and The real-time load F'determines the amount of change n of the open quantity of the modular machine, where when -1<n<1, the number of activated modules of the modular machine remains unchanged; when n≥1, one by one Start the n modules in the standby state; and when n≤-1, shut down the n modules in the running state one by one.

In the above-mentioned preferred technical solution of the control method of the air-cooled modular unit, the control method further includes:

Cooled module unit when the operation time T reaches a second predetermined _operating period Tp2, the real-time determination of the temperature of the water cooled module unit has reached the target temperature Tset is water, wherein said second predetermined period of time Tp2 Longer than the first predetermined time period Tp1;

If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, shut down the air-cooled module unit; and

If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet temperature Tset, return to the step of recalculating the real-time capacity attenuation coefficient L'and the real-time load R'.

In a preferred aspect of the method of controlling the air unit modules, the modules all start the machine one by one, when the cooled module unit operation _run time T reaches a second predetermined period of time Tp2 when determining the cooled module Whether the real-time outlet water temperature of the unit reaches the target outlet water temperature Tset;

If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, shut down the air-cooled module unit;

If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet temperature Tset, the real-time capacity attenuation coefficient L'and the real-time load R'are recalculated, and based on the recalculated real-time capacity attenuation coefficient L'and the real-time load R'determine the amount of change n of the open quantity of the modular machine, where -N<n<1; and

When the absolute value of the change amount n is less than 1, all the modular machines continue to remain in the open state; and when -N<n≤-1, the n modules in the running state are turned off one by one.

In a preferred aspect of the method of controlling the air-cooling unit of the module, all the modules in the state machine will remain on or off one by one n-th of the machine module in an operating state, when the cooled module unit operation _run time T When the second predetermined time period Tp2 is reached, the step of judging whether the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset is re-entered.

In the preferred technical solution of the control method of the air-cooled modular unit, the real-time capacity attenuation coefficient L of the air-cooled modular unit is calculated based on the following formula:

L={[A*(Tset/To)] ² +[B*(Te'/Te)] ² } ^1/2 , (Formula 1)

Among them, both A and B are constants.

In the preferred technical solution of the control method of the air-cooled module unit, the real-time load F is calculated based on the following formula:

F=L*M’/M (Formula 2).

In the preferred technical solution of the control method of the air-cooled modular unit described above, the opening number N'of the modular unit is calculated based on the following formula:

N’=F*N, (Formula 3)

Among them, N'takes the integer value of F*N+1.

In the preferred technical solution of the control method of the air-cooled module unit, the change amount n is calculated based on the following formula:

n=F’*N-N’ (Formula 4).

Those skilled in the art can understand that in the technical solution of the control method of the air-cooled module unit of the present invention, in order to avoid the large fluctuation of the outlet water temperature of the air-cooled module unit and the technical problems of low energy efficiency, the control method collects the air-cooled module The design water temperature To, the target water temperature Tset, and the design ambient temperature Te of the unit, the total number of modules N, and the total number of terminals M, and measure the real-time ambient temperature Te' to calculate the real-time air-cooled module unit based on these parameters Capacity attenuation coefficient L; calculate the real-time load F of the air-cooled module unit based on the total number of terminals M, the number of terminals real-time open M'and the real-time capacity attenuation coefficient L; calculate the module machine needs to be turned on based on the real-time load F and the total number of modules The number N'; and then start the module machine based on the calculated number N'. This way, by judging the end load change to control the number of start and stop of the module units of the air-cooled module unit, that is, when the ambient temperature is high or the unit load is small, only part of the module units are started to maintain a stable water outlet temperature, which can not only solve the problem of air cooling The technical problems of the large fluctuation of the outlet water temperature of the modular unit and the reduction of the unit's energy efficiency, and the frequent start and stop of the unit can also be avoided.

Preferably, during the operation of the air-cooled module unit, according to changes in ambient temperature and/or load, the real-time capacity attenuation coefficient L'and real-time load F'of the air-cooled module unit are recalculated to adjust the number of modules to be turned on in real time. So as to ensure the stability of the outlet water temperature.

Preferably, the formula 1 "L={[A*(Tset/To)] ² +[B*(Te'/Te)] ² } ^1/2 "represents the capacity attenuation coefficient curve of the air-cooled module unit, and the air-cooled module The real-time capacity attenuation coefficient of the unit is determined according to the capacity attenuation coefficient curve. Therefore, based on the real-time capability attenuation coefficient, the start and stop of the air-cooled module unit can be controlled more accurately.

Description of the drawings

The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

Fig. 1 is an example of a system of an air-cooled modular unit to which the control method of an air-cooled modular unit of the present invention can be applied;

Figure 2 is a flow chart of the control method of the air-cooled modular unit of the present invention;

Fig. 3 is a flowchart of an embodiment of the control method of the air-cooled modular unit of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

In order to solve the technical problems of large water temperature fluctuations and insufficient energy efficiency of the existing air-cooled modular units, the present invention provides a control method of an air-cooled modular unit. The air-cooled modular unit includes multiple parallel modular units and can be connected to multiple At the end, the control method includes:

Measuring the real-time ambient temperature Te' of the air-cooled module unit and determining the real-time opening number M'of the terminal;

Based on the real-time load F and the total number N of the modular machines, calculate the number N'of opening the modular machines; and

The modular machine is started based on the calculated opening number N'.

The designed water temperature To and the designed ambient temperature Te refer to the parameters based on the design and selection of air-cooled modular units. The target outlet water temperature Tset refers to the target outlet water temperature of the unit selected by the user based on specific operating conditions when the air-cooled module unit is running.

Fig. 1 is an example of an air-cooled modular unit system to which the control method of the air-cooled modular unit of the present invention can be applied. As shown in FIG. 1, the air-cooled modular unit has a number of N multiple air-cooled modular machines 11 connected in parallel with each other and is connected to a number of M multiple terminals 12 in fluid communication through pipes. Each modular machine 11 has an independent heat pump refrigeration system. These modular machines 11 can provide cold water and/or hot water for part or all of the terminals 12 as required to meet the cooling and heating load requirements of users. The control method of the air-cooled module unit of the present invention can be applied to the air-cooled module unit, so as to control the number of start and stop of the module unit 11 of the air-cooled module unit by judging the load change of the terminal 12 according to changes in the environment and/or load , So as to ensure a stable water temperature, and avoid frequent start and stop of the unit, thereby improving the energy efficiency ratio of the unit.

Fig. 2 is a flow chart of the control method of the air-cooled modular unit of the present invention. The control method of the air-cooled modular unit of the present invention includes steps S1, S2, S3, S4, S5, and S6. In step S1, input the design outlet temperature To of the air-cooled module unit, the target outlet temperature Tset, the design ambient temperature Te, the total number of modules N, and the total number of terminals M. In step S2, the real-time ambient temperature Te' of the air-cooled module unit is measured, and the real-time opening number M'of the terminal is determined. In step S3, the real-time capacity attenuation coefficient L of the air-cooled module unit is calculated based on the design outlet water temperature To, the target outlet water temperature Tset, the design environment temperature Te, and the real-time environment temperature Te'. In one or more embodiments, the real-time capability attenuation coefficient L is calculated using formula 1, namely:

L={[A*(Tset/To)] ² +[B*(Te'/Te)] ² } ^1/2 ,

Among them, A and B are constants related to the air-cooled module unit, which can be determined according to experiments. In step S4, the real-time load F of the air-cooled module unit is calculated based on the real-time capacity attenuation coefficient L, the total number of terminals M and the real-time opening number M'. In one or more embodiments, the real-time load of the air-cooled module unit is F=L*M'/M (Equation 2). In step S5, based on the real-time load F and the total number of modular computers N, the number of open modular computers N'is calculated. In one or more embodiments, N'=F*N (Equation 3), where N'takes the integer value of F*N+1. In step S6, the module machine is started based on the calculated number of openings N'. Unless explicitly stated to the contrary, there is no restriction on the order of execution of these steps. For example, steps S1 and S2 can be executed at the same time.

Fig. 3 is a flowchart of an embodiment of the control method of the air-cooled modular unit of the present invention. As shown in Figure 3, in one or more embodiments, the control method of the air-cooled module unit of the present invention includes steps S1-S5, so as to obtain the real-time capacity attenuation coefficient of the air-cooled unit by using formulas 1, 2 and 3, respectively. L, real-time load L, and the number N'that the module needs to be turned on.

In one or more embodiments, after calculating the number N'that the module needs to be turned on in step S5, the control method may proceed to step S7. As shown in Fig. 3, in step S7, the calculated opening number N'is compared with the total number N of modular machines. When the calculated opening number N'is less than the total number N of modular machines, the control method proceeds to step S8, that is, the modular machines are started one by one according to the calculated starting number N'. When the calculated opening number N'is greater than or equal to N, the control method proceeds to step S15 to start all N modular machines one by one. There is a time interval between the module machines being started one by one, for example, every 3 minutes (other suitable time intervals can be selected according to needs) to start a module machine in order to reduce the circuit load at the start.

After the start of N'modular machines in step S8 is completed, the control method proceeds to step S9 to determine whether the unit operating time T _runs beyond the first time interval Tp1. In one or more embodiments, the first time interval Tp1=N'*3+10, and the unit is minutes, where "3" is the startup interval of the module machine 3 minutes. In other embodiments, the activation time interval may be longer or shorter than 3 minutes.

If the run time T _run does not exceed a first predetermined period Tp1, the control method returns to step S8, start one by one after the holding operation N 'station module or boot unit. If the run time T _run exceeds a first predetermined period Tp1, the control method proceeds to step S10, the real-time according to the measured ambient temperature Te 'real ability to recalculate damping coefficient L' and real-time load F '. In one or more embodiments, the calculation formulas used are Formula 1 and Formula 2 respectively. Then, the control method proceeds to step S11, in which step S11 determines the change amount n of the open number of the module based on the recalculated real-time capacity attenuation coefficient L'and real-time load F'. The control method then proceeds to step S12 to determine whether the amount of change n is -1<n<1. If so, it means that the number of modules that have been activated does not need to be changed, for example, continue to operate with the calculated opening number N'until the operating time of the air-cooled module unit reaches the second predetermined time period Tp2, for example, 30 minutes (step S16). The second predetermined time period Tp2 should be longer than the first predetermined time period Tp2. Then, the control method proceeds to step S17 to determine whether the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset. If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, the air-cooled module unit stops running (step S18), and the control flow ends. If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet water temperature Tset, the control method returns to step S10 to recalculate the real-time capacity attenuation coefficient L'and the real-time load F'.

As shown in Figure 3, when n≥1, it means that the total capacity of the activated modules is not enough to meet the actual load demand, and more modules need to be activated. Therefore, the control method proceeds to step S13, and the modules in the standby state are activated one by one. n modular machines. On the contrary, when n≤-1, it means that the total capacity of the running module machines exceeds the actual load demand. Therefore, the control method proceeds to step S14, and the n modules in the running state are shut down one by one. There is also a time interval between the module machines being closed one by one, for example, every 3 minutes (other suitable time intervals can be selected according to the needs) to shut down a module machine. Then, cooled module unit to start timing operation until it reaches a second predetermined time T _run period Tp2 of, for example, 30 minutes (step S16). When the second predetermined period of time Tp2, cooled module unit operation control method of _operation time T reaches also proceeds to step S17, cooled module unit is determined in real time whether the water temperature reaches the target water temperature Tset. If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, the air-cooled module unit stops running (step S18), and the control flow ends. If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet water temperature Tset, the control method returns to step S10 to recalculate the real-time capacity attenuation coefficient L'and the real-time load F'.

With continued reference to FIG. 3, in one or more embodiments, after the start of all N sets of machine modules one by one in step S15, start timing cooled module unit can also run time T _run until it reaches a second predetermined period of time Tp2 of, For example, 30 minutes (step S16). When cooled module unit operation _run time T reaches a second predetermined period Tp2, the control method proceeds to step S17, and then determines the temperature of the water cooled module unit reaches the target water temperature Tset. If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, the air-cooled module unit stops running (step S18), and the control flow ends. If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet water temperature Tset, the control method returns to step S10 to recalculate the real-time capacity attenuation coefficient L'and the real-time load F'using the measured real-time ambient temperature Te'. Then, the control method proceeds to step S11, based on the recalculated real-time capacity attenuation coefficient L'and real-time load F'to determine the amount of change n of the opening number of the modular machine. In the case that all modules have been started, the actual value range of n should be -N<n<1, that is, there is no need to start a new module. Thus, if -1 <n <1, the control method proceeds to step S16, i.e., cooled module unit to start timing operation until it reaches a second predetermined time T _run period Tp2 of, for example, 30 minutes. If -N<n≤-1, it means that the total capacity of the running module machine exceeds the actual load demand, so it is necessary to shut down the n running module machines. Correspondingly, the control method proceeds to step S14. Then, control proceeds to step S16, i.e., cooled module unit to start timing operation until it reaches a second predetermined time T _run period Tp2 of, for example, 30 minutes, or to meet the needs of the other longer or shorter period of time. When cooled module unit operation _run time T reaches a second predetermined period Tp2, the control method proceeds to step S17, and then determines in real time the temperature of the water cooled module unit reaches the target water temperature Tset. If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, the air-cooled module unit stops running (step S18), and the control flow ends. If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet water temperature Tset, the control method also returns to step S10 to recalculate the real-time capacity attenuation coefficient L'and the real-time load F'.

During the operation of the air-cooled modular unit of the present invention, the control method of the air-cooled modular unit can measure the load changes under different working conditions according to the performance attenuation curve of the unit, and can adjust in real time according to the real-time changes of ambient temperature and/or load The operating quantity of the modular units ensures the stable supply of the outlet water temperature of the air-cooled modular units, avoids frequent start and stop of the compressors, and improves the energy efficiency ratio of the air-cooled modular units.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

A control method of an air-cooled modular unit, characterized in that, the air-cooled modular unit includes multiple modular computers connected in parallel and can be connected to multiple terminals, and the control method includes:

Input the design outlet temperature To, target outlet temperature Tset, and design ambient temperature Te of the air-cooled module unit, the total number N of the module units, and the total number M of the terminals;

Measure the real-time ambient temperature Te' of the air-cooled module unit and determine the real-time opening quantity M'of the terminal;

Calculate the real-time capacity attenuation coefficient L of the air-cooled module unit based on the design water temperature To, the target water temperature Tset, the design ambient temperature Te, and the real-time ambient temperature Te';

Calculate the real-time load F of the air-cooled module unit based on the real-time capacity attenuation coefficient L, the total number M of the terminals, and the real-time opening number M';

Based on the real-time load F and the total number N of the modular computers, calculate the number of openings N'of the modular computers; and

The modular machine is activated based on the calculated opening number N'.
The control method of the air-cooled modular unit according to claim 1, wherein the step of starting the modular unit based on the calculated opening number N'further comprises the following steps:

Compare the calculated opening number N'with the total number of modules N,

When the calculated opening number N'is less than the total number N of the modular machines, start the modular machines one by one according to the calculated opening number N'; and

When the calculated opening number N'is greater than or equal to the total number N of the modular machines, all the modular machines are started one by one.
The control method of the air-cooled modular unit according to claim 2, characterized in that, after the modular units are started one by one according to the calculated opening number N', the control method further comprises:

Analyzing the operation of the operation time T cooled module unit exceeds a first predetermined period Tp1 of;

If the run time T run does not exceed a first predetermined period Tp1, the module continues to run at the calculated opening amount N 'operation; and

If the operating time T runs beyond the first predetermined time period Tp1, the real-time capacity attenuation coefficient L'and the real-time load F'are recalculated, and based on the recalculated real-time capacity attenuation coefficient L'and The real-time load F'determines the amount of change n of the open quantity of the modular machine, where when -1<n<1, the number of activated modules of the modular machine remains unchanged; when n≥1, one by one Start the n modules in the standby state; and when n≤-1, shut down the n modules in the running state one by one.
The control method of the air-cooled modular unit according to claim 3, wherein the control method further comprises:

Cooled module unit when the operation time T reaches a second predetermined operating period Tp2, the real-time determination of the temperature of the water cooled module unit has reached the target temperature Tset is water, wherein said second predetermined period of time Tp2 Longer than the first predetermined time period Tp1;

If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, shut down the air-cooled module unit; and

If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet temperature Tset, return to the step of recalculating the real-time capacity attenuation coefficient L'and the real-time load R'.
The control method of claim 2 cooled module unit as claimed in claim, characterized in that, after starting all modules in the machine one by one, when the operation of the air-cooling operation time T module unit reaches a second predetermined period of time Tp2, it is determined that Whether the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset;

If the real-time outlet water temperature of the air-cooled module unit reaches the target outlet water temperature Tset, shut down the air-cooled module unit;

If the real-time outlet water temperature of the air-cooled module unit does not reach the target outlet temperature Tset, the real-time capacity attenuation coefficient L'and the real-time load R'are recalculated, and based on the recalculated real-time capacity attenuation coefficient L'and the real-time load R'determine the amount of change n of the open quantity of the modular machine, where -N<n<1; and

When the absolute value of the change amount n is less than 1, all the modular machines continue to remain in the open state; and when -N<n≤-1, the n modules in the running state are turned off one by one.
The control method of the air-cooled modular unit according to claim 5, characterized in that, after all the modular units continue to be turned on or the n units of the modular units in the running state are turned off one by one, when the air-cooled modular unit run run time T reaches a second predetermined period Tp2, the real-time re-enter the water temperature of the cooled module unit determining whether the step of the target outlet temperature Tset is reached.
The control method of the air-cooled modular unit according to claim 1, wherein the real-time capacity attenuation coefficient L of the air-cooled modular unit is calculated based on the following formula:

L={[A*(Tset/To)] 2 +[B*(Te'/Te)] 2 } 1/2 ,

Among them, both A and B are constants.
The control method of the air-cooled modular unit according to claim 1, wherein the real-time load F is calculated based on the following formula:

F=L*M’/M.
The control method of the air-cooled modular unit according to claim 1, characterized in that the open number N'of the modular unit is calculated based on the following formula:

N’=F*N,

Among them, N'takes the integer value of F*N+1.
The control method of an air-cooled modular unit according to claim 3 or 5, wherein the change amount n is calculated based on the following formula:

n=F'*N-N'.