A control method for a virtual air valve

Abstract

This invention relates to the field of air conditioning system technology, specifically to a control method for a virtual air valve, comprising the following steps: taking several measurement points; starting the running fan and recording the measured operating power; then starting the shut-off fan; adjusting different output powers of the shut-off fan; measuring the wind speed value at each measurement point; obtaining the optimal adjustment power of the shut-off fan based on the wind speed value at each measurement point; obtaining a mapping relationship between the running fan and the shut-off fan based on the operating power of the running fan and the optimal adjustment power of the shut-off fan; and the shut-off fan operating according to the mapping relationship. This invention, by obtaining the mapping relationship between the running fan and the shut-off fan, enables the shut-off fan to start according to the operating power of the running fan, thereby offsetting the pressure difference between the inlet and outlet of the shut-off fan. This prevents the shut-off fan from reversing, preventing high-temperature gas from being re-entered into the room, thus affecting the overall cooling effect and increasing overall reliability.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and specifically to a control method for a virtual air valve. Background Technology

[0002] For air conditioners with multiple cooling systems, the following problems exist during operation:

[0003] For the outdoor side, if some exhaust fans are off (i.e., only some fans corresponding to the refrigeration system are on), the airflow will cause partial cross-flow of air to the outdoor condenser due to pressure differences, resulting in reverse heat exchange and severely affecting the cooling capacity. This is especially true in low-temperature seasons when the refrigerant pump mode is used, and the cooling capacity mainly relies on the exhaust fans.

[0004] For the indoor side, if some supply fans are off (i.e., only part of the cooling system is on or a supply fan has malfunctioned and stopped), the pressure difference will cause the supply fans to reverse. This means that when there is a need to start them (or the fault is cleared), the supply fans cannot start normally in reverse (the reverse speed is lower than the normal speed), reducing the overall airflow and affecting the cooling capacity. Furthermore, if some cooling systems are not on, the power provided by the fan reversal will cause the high-temperature return air from the indoor unit to pass through the evaporator, which has no cooling effect, and be sent back into the room, resulting in increased supply air temperature and reduced reliability. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a virtual air valve control method that can prevent the fan in a closed system from reversing.

[0006] The objective of this invention is achieved through the following technical solution: a control method for a virtual air valve, comprising an operating state system and a closed state system; the operating state system includes an operating fan and an operating heat exchanger; the closed state system includes a closed fan and a closed heat exchanger; the operating fan is located at the operating heat exchanger, and the closed fan is located at the closed heat exchanger.

[0007] The control method for the virtual air valve also includes the following steps:

[0008] S1. Take several measurement points while the heat exchanger is closed;

[0009] S2. Start the fan and record the measured operating power of the fan;

[0010] S3. Start and shut down the fan at the measured operating power of the fan;

[0011] S4. Adjust the output power of the fan to shut down at different speeds;

[0012] S5. Measure the wind speed at each measurement point with the fan turned off at different output power levels;

[0013] S6. Obtain the optimal adjustment power to shut down the fan based on the wind speed value at each measurement point;

[0014] S7. Obtain the mapping relationship between the operating fan and the shut-off fan based on the operating power of the operating fan and the optimal adjustment power of the shut-off fan;

[0015] S8. Shut down the fan. The operation is based on the mapping relationship.

[0016] The present invention is further configured such that the mapping relationship is: The N A The actual operating power of the fan; the N B The target operating power for shutting down the fan; a, b, and c are all conventional coefficients.

[0017] The present invention is further configured such that the measuring points are evenly arranged in the closed heat exchanger.

[0018] The present invention is further configured such that there are multiple operating fans; the N A This represents the average actual operating power of multiple operating fans.

[0019] The present invention is further configured such that there are multiple fans being shut down; the N B The target operating power for each shut-down fan.

[0020] The present invention is further configured such that, in step S7, the method for obtaining the mapping relationship between the operating fan and the shut-off fan based on the operating power of the operating fan and the optimal adjustment power of the shut-off fan specifically includes the following steps:

[0021] A1. Change the measured operating power of the operating fan and record the new measured operating power;

[0022] A2. Start and shut down the fan to different output powers under the new measured operating power of the fan;

[0023] A3. Measure the wind speed at each measurement point with the fan turned off at different output power levels;

[0024] A4. Obtain the optimal adjustment power to shut down the fan based on the wind speed value at each measurement point;

[0025] A5. Repeat step A1 to obtain different optimal adjustment powers for shutting down the fan under different measured operating power of the fan.

[0026] The present invention is further configured to include the following steps:

[0027] A6. Establish a coordinate system with the measured operating power of the fan and the optimal adjustment power for shutting down the fan as the coordinate axes;

[0028] A7. Draw a trend line based on the measured operating power of the running fan and the optimal adjustment power for shutting down the fan;

[0029] A8. The mapping relationship is obtained by fitting the trend line.

[0030] The present invention is further configured such that, in step A7, a trend line of a quadratic equation is formed based on the measured operating power of the running fan and the optimal adjustment power for shutting down the fan.

[0031] The present invention is further configured such that, in step A8, the trend line is fitted using the least squares curve fitting method.

[0032] The present invention is further configured such that, in step S5, a wind speed meter is used to measure the wind speed value at each measurement point.

[0033] The beneficial effects of this invention are as follows: By obtaining the mapping relationship between the running fan and the shut-off fan, this invention enables the shut-off fan to start according to the operating power of the running fan, thereby offsetting the pressure difference between the inlet and outlet of the shut-off fan. This prevents the shut-off fan from reversing, prevents high-temperature gas from being sent into the room again, thus affecting the overall cooling effect and increasing the overall reliability. Attached Figure Description

[0034] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0035] Figure 1 This is a system flowchart of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the present invention;

[0037] Among them: 1. Operating status system; 2. Shutdown status system; 3. Running fan; 4. Shutdown fan; 5. Shutdown heat exchanger; 6. Running heat exchanger. Detailed Implementation

[0038] The present invention will be further described in conjunction with the following embodiments.

[0039] Depend on Figures 1 to 2As can be seen, the virtual air valve control method described in this embodiment includes an operating state system 1 and a closed state system 2; the operating state system 1 is provided with an operating fan 3 and an operating heat exchanger 6; the closed state system 2 is provided with a closing fan 4 and a closing heat exchanger 5; the operating fan 3 is located at the operating heat exchanger 6, and the closing fan 4 is located at the closing heat exchanger 5; wherein the operating state system 1 refers to the air conditioning system in normal cooling state, and the closed state system 2 refers to the air conditioning system in a non-cooling state.

[0040] The control method for the virtual air valve also includes the following steps:

[0041] S1. Take several measurement points in the closed heat exchanger 5;

[0042] S2. Start and run fan 3, and record the measured operating power of fan 3;

[0043] S3. Start and shut down fan 4 under the measured operating power of fan 3;

[0044] S4. Adjust the different output power of the shut-off fan 4;

[0045] S5. Measure the wind speed at each measurement point with different output power of fan 4 turned off;

[0046] S6. Obtain the optimal adjustment power for shutting down fan 4 based on the wind speed value at each measurement point;

[0047] S7. Obtain the mapping relationship between the operating power of the operating fan 3 and the optimal adjustment power of the shut-off fan 4;

[0048] S8, shut down fan 4. Works according to the mapping relationship.

[0049] Specifically, the virtual air valve control method described in this embodiment requires, firstly, obtaining the mapping relationship between the running fan 3 and the shut-off fan 4, so that the shut-off fan 4 is started according to the operating power of the running fan 3, in order to offset the pressure difference between the inlet and outlet of the shut-off fan 4, thereby achieving the function of a virtual air valve. This prevents the shut-off fan 4 from reversing, prevents high-temperature gas from being sent into the room again, thus affecting the overall cooling effect, increasing the overall reliability, and also prevents the shut-off fan 4 from being in a reverse state and unable to start directly when it restarts.

[0050] The virtual air valve control method described in this embodiment has the following mapping relationship: The N A The actual operating power of fan 3; the N BThe target operating power for shutting down fan 4; a, b, and c are all conventional coefficients. Specifically, through the above settings, this embodiment enables the shut-down fan 4 to directly obtain the target operating power based on the actual operating power of the operating fan 3. This allows the shut-down fan 4 to be adjusted to the target operating power, thereby offsetting the pressure difference between the inlet and outlet of the shut-down fan 4, achieving the function of a virtual air valve. This prevents the shut-down fan 4 from reversing, preventing high-temperature gas from being sent back into the room, thus affecting the overall cooling effect, increasing overall reliability, and preventing the shut-down fan 4 from being in a reverse state and unable to start directly when restarted.

[0051] This embodiment describes a control method for a virtual air valve, wherein the measurement points are evenly arranged within the closed heat exchanger 5. This arrangement improves the stability of the mapping relationship measurement.

[0052] This embodiment describes a virtual air valve control method, in which multiple operating fans 3 are present; the N A This is the average of the actual operating power of multiple operating fans 3. In this embodiment, a virtual air valve control method is described, wherein multiple fans 4 are shut down; the N... B The target operating power for each shut-down fan 4.

[0053] Specifically, in an environment with multiple air conditioning systems, each air conditioning system is equipped with a fan. The fan of the air conditioning system in normal cooling state is the running fan 3; the fan of the air conditioning system in non-cooling state is the shut-off fan 4. Through the above settings, each shut-off fan 4 can be adjusted to the target operating power according to the average value of the total actual operating power of the running fan 3, thereby preventing the shut-off fan 4 from reversing.

[0054] The virtual air valve control method described in this embodiment, in step S7, the method for obtaining the mapping relationship between the operating fan 3 and the shut-off fan 4 based on the operating power of the operating fan 3 and the optimal adjustment power of the shut-off fan 4 specifically includes the following steps:

[0055] A1. Change the measured operating power of the operating fan 3 and record the new measured operating power;

[0056] A2. Start and shut down fan 4 to a different output power under the new measured operating power of fan 3;

[0057] A3. Measure the wind speed at each measurement point with different output power of fan 4 turned off;

[0058] A4. Obtain the optimal adjustment power for shutting down fan 4 based on the wind speed value at each measurement point;

[0059] Specifically, such as Figure 2As shown, measurement points D1-D9 are obtained in the shut-down heat exchanger 5 of system 2 in the shut-down state. The measured operating power of the running fan 3 is set to 90%. Under the 90% measured operating power of the running fan 3, the output power of the shut-down fan 4 is changed. Here, the output power of the shut-down fan 4 is measured at 10%, 20%, 30%, 40%, 50%, and 60% respectively. The wind speed values ​​at measurement points D1-D9 are measured at different output power, where the positive or negative sign of the wind speed value represents the wind direction. The following table is obtained:

[0060]

[0061]

[0062] As can be seen from the table above, when the measured operating power of fan 3 is 90% and the output power of fan 4 is 30%, the wind speed values ​​at measurement points D1-D9 are all zero. This indicates that in this state, fan 4 will not reverse when it is turned off and is in the most energy-saving state. Therefore, an output power of 30% is the optimal adjustment power when fan 4 is turned off and the measured operating power of fan 3 is 90%.

[0063] A5. Repeat step A1 to obtain different optimal adjustment powers for shutting down fan 4 under different measured operating power of fan 3. After adjusting the measured operating power of fan 3 to 90%, 80%, 70%, 60%, 50%, 40%, 30%, and 20%, repeat the above steps to obtain the optimal adjustment power for shutting down fan 4 at these measured operating power levels. The results are shown in the table below.

[0064] A (x-axis) 90 80 70 60 50 40 30 20 B (y-axis) 30 b2 b3 b4 b5 b6 b7 b8

[0065] A6. Establish a coordinate system based on the table above, with the measured operating power of fan 3 and the optimal adjustment power for shutting down fan 4 as the coordinate axes;

[0066] A7. A trend line is formed based on the measured operating power of fan 3 and the optimal adjustment power for shutting down fan 4;

[0067] A8. The mapping relationship is obtained by fitting the trend line.

[0068] In the virtual air valve control method described in this embodiment, in step A7, a trend line of a quadratic equation is formed based on the measured operating power of the running fan 3 and the optimal adjustment power of the shut-off fan 4; specifically, the curve of the quadratic equation is smoother and more suitable for adjusting the target operating power of the shut-off fan 4.

[0069] In the virtual damper control method described in this embodiment, step A8 employs a least-squares curve fitting method to fit the trend line. Specifically, this setting allows for a more accurate deriving of the quadratic equation, thereby obtaining the mapping relationship. The conventional coefficient values ​​of a, b, and c.

[0070] In the virtual air valve control method described in this embodiment, step S5 involves using an anemometer to measure the wind speed at each measurement point. This setup improves the accuracy of the mapping relationship obtained by the virtual air valve control method.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A control method for a virtual air valve, characterized in that: It includes an operating status system and a shutdown status system; the operating status system is equipped with an operating fan and an operating heat exchanger; the shutdown status system is equipped with a shutdown fan and a shutdown heat exchanger; the operating fan is located at the operating heat exchanger, and the shutdown fan is located at the shutdown heat exchanger; The control method for the virtual air valve also includes the following steps: S1. Take several measurement points while the heat exchanger is closed; S2. Start the fan and record the measured operating power of the fan; S3. Start and shut down the fan at the measured operating power of the fan; S4. Adjust the output power of the fan to shut down at different speeds; S5. Measure the wind speed at each measurement point with the fan turned off at different output power levels; S6. Obtain the optimal adjustment power to shut down the fan based on the wind speed value at each measurement point; S7. Obtain the mapping relationship between the operating fan and the shut-off fan based on the operating power of the operating fan and the optimal adjustment power of the shut-off fan; S8. Shut down the fan and operate according to the mapping relationship.

2. The control method for a virtual air valve according to claim 1, characterized in that: The mapping relationship is as follows: The N A The actual operating power of the fan; the N B The target operating power for shutting down the fan; a, b, and c are all conventional coefficients.

3. The control method for a virtual air valve according to claim 1, characterized in that: The measurement points are evenly arranged in the closed heat exchanger.

4. The control method for a virtual air valve according to claim 2, characterized in that: There are multiple operating fans; the N A This represents the average actual operating power of multiple operating fans.

5. The control method for a virtual air valve according to claim 2, characterized in that: There are multiple shut-off fans; the N B The target operating power for each shut-down fan.

6. The control method for a virtual air valve according to claim 1, characterized in that: In step S7, the method for obtaining the mapping relationship between the operating fan and the shut-off fan based on the operating power of the operating fan and the optimal adjustment power of the shut-off fan specifically includes the following steps: A1. Change the measured operating power of the operating fan and record the new measured operating power; A2. Start and shut down the fan to different output powers under the new measured operating power of the fan; A3. Measure the wind speed at each measurement point with the fan turned off at different output power levels; A4. Obtain the optimal adjustment power to shut down the fan based on the wind speed value at each measurement point; A5. Repeat step A1 to obtain different optimal adjustment powers for shutting down the fan under different measured operating power of the fan.

7. The control method for a virtual air valve according to claim 6, characterized in that: It also includes the following steps: A6. Establish a coordinate system with the measured operating power of the fan and the optimal adjustment power for shutting down the fan as the coordinate axes; A7. Draw a trend line based on the measured operating power of the running fan and the optimal adjustment power for shutting down the fan; A8. The mapping relationship is obtained by fitting the trend line.

8. The control method for a virtual air valve according to claim 7, characterized in that: In step A7, a trend line of a quadratic equation is formed based on the measured operating power of the running fan and the optimal adjustment power for shutting down the fan.

9. The control method for a virtual air valve according to claim 7, characterized in that: In step A8, the trend line is fitted using the least squares curve fitting method.

10. The control method for a virtual air valve according to claim 1, characterized in that: In step S5, an anemometer is used to measure the wind speed at each measurement point.

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