Optimization control method and terminal for heat dissipation fan

Abstract

This invention discloses an optimized control method and terminal for a cooling system's heat dissipation fan. By detecting relevant parameters of the external environment, specifically detecting the actual air pressure at the air inlet and calculating an air pressure correction coefficient, it avoids changes in the internal gas flow rate of the fan due to altitude, thus affecting the actual heat exchange efficiency of the fan. Simultaneously, it detects the actual wind speed of the heat dissipation fan and calculates a wind speed correction coefficient to prevent deviations in wind speed caused by mechanical wear or malfunctions of the heat dissipation fan, thereby affecting the actual heat exchange efficiency of the fan. Furthermore, it corrects the operating frequency of the heat dissipation fan based on a preset heat exchange target, combined with the air pressure correction coefficient and the wind speed correction coefficient, thereby eliminating the influence of external operating conditions on the open system.

Description

[0001] This case is a divisional application based on the invention patent filed on April 11, 2024, with application number 202410430624.0 and titled "An Optimized Control Method and Terminal for a Cooling System's Heat Dissipation Fan". Technical Field

[0002] This invention relates to the field of cooling, and in particular to an optimized control method and terminal for a cooling system's heat dissipation fan. Background Technology

[0003] The control parameter settings for the air cooling side (including condenser and unit) of the water-cooled unit mainly rely on the factory settings based on theoretical calculations. For example, the required air-side heat exchange is calculated based on the high pressure value of the refrigerant system, and then the fan frequency required to achieve that heat exchange is calculated based on this heat exchange. The fan frequency and the high pressure value of the refrigerant system correspond one-to-one, and the air cooling side parameters are fixed.

[0004] However, unlike closed water systems and refrigerant systems, the air cooling side is an open system. While closed systems are largely unaffected by external factors, the air cooling side of open systems is significantly influenced by the external environment. Cooling systems can be used in low-altitude plains or high-altitude mountainous areas; they can be used in islands with excellent air quality or in areas with severe air pollution. These different environments will cause varying performance changes in the air cooling side of the water-cooled unit. If the impact of the external environment on the air cooling side of the water-cooled unit is not considered, it will be difficult to achieve an optimal match between the cooling requirements of the water-cooled unit and the energy storage system. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an optimized control method and terminal for the cooling fan of a cooling system, so as to solve the problem of interference of external operating conditions on the cooling fan.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] An optimized control method for a cooling system's heat dissipation fan, comprising the following steps:

[0008] S1. Detect the actual air pressure value at the air inlet of the cooling fan and calculate the air pressure correction coefficient;

[0009] S2. Detect the actual wind speed of the cooling fan and calculate the wind speed correction coefficient;

[0010] S3. Based on the air pressure correction coefficient and the wind speed correction coefficient, and with a preset heat exchange target, correct the operating frequency of the fan.

[0011] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows:

[0012] An optimized control terminal for a cooling system's heat dissipation fan includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it performs the following steps:

[0013] S1. Detect the actual air pressure value at the air inlet of the cooling fan and calculate the air pressure correction coefficient;

[0014] S2. Detect the actual wind speed of the cooling fan and calculate the wind speed correction coefficient;

[0015] S3. Based on the air pressure correction coefficient and the wind speed correction coefficient, and with a preset heat exchange target, correct the operating frequency of the fan.

[0016] The beneficial effects of this invention are as follows: It provides an optimized control method and terminal for a cooling system's heat dissipation fan. By detecting relevant parameters of the external environment, specifically detecting the actual air pressure value at the air inlet and calculating the air pressure correction coefficient, it avoids changes in the internal gas flow of the fan due to altitude issues, thereby affecting the actual heat exchange efficiency of the fan. At the same time, it also detects the actual wind speed of the heat dissipation fan and calculates the wind speed correction coefficient, avoiding deviations in wind speed due to mechanical wear or malfunctions of the heat dissipation fan, thereby affecting the actual heat exchange efficiency of the fan. In addition, it corrects the operating frequency of the heat dissipation fan by using a preset heat exchange target and combining the air pressure correction coefficient and the wind speed correction coefficient, thereby eliminating the influence of external operating conditions on the open system. Attached Figure Description

[0017] Figure 1 This is a flowchart of an optimized control method for a cooling system's heat dissipation fan according to Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the heat transfer curve in the low-noise mode of the optimized control method for the cooling fan of a cooling system in Embodiment 4 of the present invention.

[0019] Figure 3 This is a flowchart illustrating the optimized control method for a cooling system's heat dissipation fan in Embodiment 4 of the present invention.

[0020] Figure 4 This is a schematic diagram of an optimized control terminal for a cooling system's heat dissipation fan, as shown in Embodiment 4 of the present invention.

[0021] Label Explanation:

[0022] 1. Terminal; 2. Memory; 3. Processor. Detailed Implementation

[0023] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0024] Please refer to Figure 1 An optimized control method for a cooling system's heat dissipation fan, comprising the following steps:

[0025] S1. Detect the actual air pressure value at the air inlet of the cooling fan and calculate the air pressure correction coefficient;

[0026] S2. Detect the actual wind speed of the cooling fan and calculate the wind speed correction coefficient;

[0027] S3. Based on the pressure correction coefficient and the wind speed correction coefficient, and with the preset heat exchange as the target, correct the operating frequency of the fan.

[0028] As can be seen from the above description, the beneficial effects of the present invention are as follows: By detecting relevant parameters of the external environment, specifically detecting the actual air pressure value at the air inlet and calculating the air pressure correction coefficient, the changes in the internal gas flow of the fan due to altitude issues are avoided, thus affecting the actual heat exchange efficiency of the fan; at the same time, the actual wind speed of the cooling fan is also detected and the wind speed correction coefficient is calculated, thus avoiding deviations in wind speed due to mechanical wear or malfunctions of the cooling fan, thereby affecting the actual heat exchange efficiency of the fan; in addition, the operating frequency of the cooling fan is corrected by using a preset heat exchange target and combining the air pressure correction coefficient and the wind speed correction coefficient, thereby eliminating the influence of external operating conditions on the open system.

[0029] In an embodiment of the present invention, step S2 specifically comprises:

[0030] S21. Calculate the preset target wind speed based on the preset heat exchange rate;

[0031] S22. Detect the actual wind speed of the cooling fan, and use the ratio of the preset target wind speed to the actual wind speed as the wind speed correction coefficient.

[0032] As described above, the operating frequency of the cooling fan needs to be adjusted according to the actual working conditions. To meet different heat exchange requirements, the operating frequency needs to be adjusted, thereby changing the operating speed of the cooling fan. Therefore, in this example, the preset target air speed is initially anchored by preset heat exchange. Specifically, the preset target air speed can be calculated based on the cooling fan's factory information. Subsequently, by detecting the actual air speed of the cooling fan, the ratio of the preset target air speed to the actual air speed is used as the air speed correction coefficient, thereby eliminating the influence of the actual operating conditions of the cooling fan on the fan and ensuring the stable execution of the heat dissipation work.

[0033] In an embodiment of the present invention, step S22 is followed by step S23:

[0034] The wind speed correction coefficient is compared with a preset threshold. If the wind speed correction coefficient is greater than the preset threshold, a cooling fan blockage warning is issued.

[0035] As can be seen from the above description, the air speed of the cooling fan is a direct reflection of the fan's working status. When the fan is running normally but the air speed is still lower than expected, it is considered that a blockage has occurred. The air speed correction coefficient calculated based on the above steps is the ratio of the preset standard air speed to the actual air speed. When the air speed correction coefficient is greater than the preset threshold related to the blockage condition, it means that the fan is blocked at this time, and then a cooling fan blockage warning is issued.

[0036] In an embodiment of the present invention, step S1 specifically comprises:

[0037] The actual air pressure at the air inlet of the cooling fan is detected, the actual air density is calculated based on the actual air pressure, and the ratio of the actual air density to the preset air density is used as the air pressure correction coefficient.

[0038] It should be noted that for fluids, q = cρQΔT, where q is heat, c is the specific heat capacity of the fluid, ρ is the fluid density, and Q is the fluid flow rate. Ignoring other factors, the air density at an altitude of 3000m is approximately 75% of that at 0m. This means that the higher the altitude, the lower the air pressure and the lower the air density; therefore, for the same fluid flow rate, less heat is carried away. Based on this, and utilizing the one-to-one correspondence between air pressure and air density, the inventors proposed using the ratio of the actual air pressure at the air inlet to a preset air density as an air pressure correction coefficient. This corrects for the impact of air density on heat dissipation efficiency, thereby addressing the influence of altitude changes on the operation of the fan in an open system.

[0039] Please refer to Figure 2 In an embodiment of the present invention, step S3 further includes the step of:

[0040] Determine whether the cooling fan is in low-noise mode. If yes, use the first preset frequency as the operating frequency; otherwise, use the second preset frequency as the operating frequency.

[0041] The first preset frequency is less than the second preset frequency.

[0042] As can be seen from the above description, since the fan will generate noise during operation, for environments with noise control requirements, it is necessary to control the operating frequency of the cooling fan. Therefore, in this example, it is determined whether the fan is in low noise mode, thereby limiting the initial operating frequency of the fan. If the fan is in low noise mode, the first preset frequency is selected as the operating frequency; otherwise, the second preset frequency, which is greater than the first preset frequency, is selected as the operating frequency.

[0043] Specifically, when the fan is in low-noise mode, the fan operating frequency decreases, which reduces the heat dissipation effect in the cooling system. To solve this problem, the condenser in the cooling system of this example is equipped with two cooling branches, a and b. Branch a is the main branch with a cooling capacity of 70%, and branch b is the auxiliary cooling branch with a cooling capacity of 30%. When in non-low-noise mode, since the fan operating frequency is high, only branch a needs to be turned on to complete the heat exchange. When in low-noise mode, both branches a and b are turned on to meet the heat exchange requirements, and heat exchange is carried out through the cooling fan.

[0044] Please refer to Figure 4 An optimized control terminal for a cooling system's heat dissipation fan is characterized by comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it completes the steps in the optimized control method for the cooling system's heat dissipation fan, i.e., a carrier executes the steps in the above method. When executing the above steps, the operating frequency of the heat dissipation fan is corrected by taking a preset heat exchange rate as the target and combining the air pressure correction coefficient and the wind speed correction coefficient, thereby eliminating the influence of external operating conditions on the open system.

[0045] The present invention provides an optimized control method and terminal for a cooling system's heat dissipation fan, which is mainly used to eliminate the influence of external operating conditions on the fan performance. The following is a detailed description with reference to the embodiments.

[0046] Please refer to Figure 1 Embodiment 1 of the present invention is as follows:

[0047] An optimized control method for a cooling system's heat dissipation fan, comprising the following steps:

[0048] S1. Detect the actual air pressure value at the air inlet of the cooling fan and calculate the air pressure correction coefficient to avoid changes in the internal gas flow of the fan due to altitude, which would affect the actual heat exchange efficiency of the fan.

[0049] S2. Detect the actual wind speed of the cooling fan and calculate the wind speed correction coefficient to avoid wind speed deviation due to mechanical wear or failure of the cooling fan, which would affect the actual heat exchange efficiency of the fan.

[0050] S3. Based on the pressure correction coefficient and wind speed correction coefficient, with the preset heat exchange as the target, correct the operating frequency of the fan to eliminate the influence of external operating conditions on the cooling fan.

[0051] Preferably, step S1 specifically includes:

[0052] The actual air pressure at the air inlet of the cooling fan is detected, the actual air density is calculated based on the actual air pressure, and the ratio of the actual air density to the preset air density is used as the air pressure correction coefficient.

[0053] Embodiment 2 of the present invention is as follows:

[0054] Based on Example 1, step S2 specifically includes:

[0055] S21. Calculate the preset target wind speed based on the preset heat exchange rate;

[0056] S22. Detect the actual wind speed of the cooling fan and use the ratio of the preset standard wind speed to the actual wind speed as the wind speed correction coefficient.

[0057] S23. Compare the wind speed correction coefficient with the preset threshold. If the wind speed correction coefficient is greater than the preset threshold, issue a warning of blocked cooling fan.

[0058] In this implementation, the operating frequency of the cooling fan needs to be adjusted according to the actual working conditions. Different heat exchange requirements require adjustment of the operating frequency, which in turn changes the operating speed of the cooling fan. Therefore, in this example, the preset target air speed is initially anchored by preset heat exchange. Subsequently, the actual air speed of the cooling fan is detected, and the ratio of the preset target air speed to the actual air speed is used as the air speed correction coefficient. This eliminates the influence of the actual operating conditions of the cooling fan on the fan and ensures the stable execution of the heat dissipation work.

[0059] In addition, the airflow speed of the cooling fan is a direct reflection of the fan's working status. When the fan is running normally but the airflow speed is still lower than expected, it is considered that a blockage has occurred. The airflow correction coefficient calculated based on the above steps is the ratio of the preset standard airflow speed to the actual airflow speed. When the airflow correction coefficient is greater than the preset threshold related to the blockage condition, it means that the fan is blocked at this time, and a cooling fan blockage warning is issued.

[0060] Please refer to Figure 2 Embodiment 3 of the present invention is as follows:

[0061] Based on Embodiment 1, step S3 further includes the following step:

[0062] Determine whether the cooling fan is in low-noise mode. If yes, use the first preset frequency as the operating frequency; otherwise, use the second preset frequency as the operating frequency.

[0063] The first preset frequency is less than the second preset frequency.

[0064] Because the fan generates noise during operation, the operating frequency of the cooling fan needs to be controlled in environments with noise control requirements. Therefore, in this example, it is determined whether the fan is in low-noise mode to limit the initial operating frequency of the fan. If the fan is in low-noise mode, a first preset frequency is selected as the operating frequency; otherwise, a second preset frequency higher than the first preset frequency is selected as the operating frequency. Specifically, when the fan is in low-noise mode, the fan operating frequency decreases, and the heat dissipation effect in the cooling system will decrease. To solve the above problem, the condenser in the cooling system of this example is equipped with two cooling branches, a and b. Branch a is the main branch, accounting for 70% of the cooling capacity, and branch b is the auxiliary cooling branch, accounting for 30% of the cooling capacity. When in non-low-noise mode, since the fan operating frequency is higher, only branch a needs to be turned on to complete the heat exchange. When in low-noise mode, both branches a and b are turned on to meet the heat exchange requirements, and heat exchange is carried out through the cooling fan.

[0065] Please refer to Figure 3 Embodiment four of the present invention is as follows:

[0066] The specific application of the optimized control method for the cooling system's heat dissipation fans is as follows:

[0067] Based on the fan performance, the following parameters are obtained for the frequency, wind speed, noise level, and heat exchange capacity of a fan with a rated heat exchange capacity of 15kW:

[0068]

[0069] Based on the above parameter table and tests, the relationship between the fan operating frequency y and the wind speed v is as follows:

[0070] y = 4.51343v 2 +5.39919v +13.27427

[0071] The formula for correcting the operating frequency of the wind turbine is as follows:

[0072]

[0073] Where y1 is the corrected fan operating frequency; y0 is the preset fan operating frequency; k1 is the air pressure correction coefficient; k2 is the wind speed correction coefficient; and c and d are constants.

[0074] (1) Low-noise mode: Normal mode is when only branch a of the condenser conducts heat; low-noise mode is when both branches a and b are conducting heat. Figure 2 As shown, when the required heat exchange is 10kW, the noise level is 75dB in normal mode and 65dB in low-noise mode.

[0075] (2) Air Pressure Correction: When the equipment is located in an environment at an altitude of 3000m with an air pressure of 70kPa, the required heat exchange is 10kW. According to the table above, the preset fan frequency y0 = 50% and the wind speed v = 2.28m / s. By detecting the air pressure value, the air density ρ0 at 3000m and 20℃ is calculated to be 0.0833kg / m³. 3 The air density at an altitude of 0m and a temperature of 20℃ is ρ1 = 1.204 kg / m³. 3 At this time, the pressure correction coefficient k1 = ρ0 / ρ1 = 1.445.

[0076] If the fan frequency is not corrected, based on air density, wind speed, and heat exchange, the provided heat exchange is approximately 6.1 kW, which is far from sufficient. To meet the 10 kW heat exchange requirement, the fan frequency needs to be corrected by increasing the wind speed. At this point, the wind speed v1 = 2.28 m / s × 1.445 = 3.32 m / s, resulting in a corrected frequency y1 = 80%.

[0077] (3) Wind speed correction: When the heat exchange is required to be 10kw, when the air inlet and outlet of the equipment are slightly blocked, when 0.9 times the preset wind speed ≤ actual wind speed ≤ 1.1 times the preset wind speed, the wind speed correction coefficient is regarded as 1, that is, when the actual wind speed is in this range, the wind speed does not need to be corrected.

[0078] When the preset fan frequency is 50%, according to Table 1, the corresponding preset wind speed v1 = 2.28 m / s. When operating at this frequency, the actual wind speed v2 is detected to be 2 m / s, which is lower than 90% of the preset wind speed. Therefore, the wind speed needs to be corrected. The wind speed correction coefficient k2 = v1 / v2 = 1.15. Substituting into the formula, we get that the corrected fan frequency is 59.

[0079] (4) Blockage warning reminder: According to the table above, select the corresponding preset wind speed v1 = 2.3m / s. When running at this frequency, the actual wind speed v2 is detected to be 1.5m / s. At this time, the wind speed correction coefficient is 1.5, which is greater than the preset threshold of 1.4. Therefore, the wind speed needs to be corrected. The correction coefficient is 1.5. Substituting into the above formula, we get that the corrected fan frequency is 85, and a blockage warning reminder is uploaded.

[0080] Please refer to Figure 4 Embodiment five of the present invention is as follows:

[0081] An optimized control terminal 1 for a cooling system's heat dissipation fan includes a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3. When the processor 3 executes the computer program, it completes the steps in the optimized control method for the heat dissipation fan of any of the cooling systems described in embodiments one to four above.

[0082] In summary, the present invention provides an optimized control method and terminal for a cooling system's heat dissipation fan. By detecting relevant parameters of the external environment, specifically detecting the actual air pressure at the air inlet and calculating the air pressure correction coefficient, it avoids changes in the internal gas flow rate of the fan due to altitude issues, thus affecting the actual heat exchange efficiency of the fan. Simultaneously, it detects the actual wind speed of the heat dissipation fan and calculates the wind speed correction coefficient to prevent deviations in wind speed caused by mechanical wear or malfunctions of the heat dissipation fan, thereby affecting the actual heat exchange efficiency of the fan. Furthermore, by using a preset heat exchange target and combining the air pressure correction coefficient and the wind speed correction coefficient, it corrects the operating frequency of the heat dissipation fan, thereby eliminating the influence of external operating conditions on the open system.

[0083] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An optimized control method for a cooling system's heat dissipation fan, characterized in that: Including the following steps: S1. Detect the actual air pressure value at the air inlet of the cooling fan, calculate the actual air density based on the actual air pressure value, and use the ratio of the actual air density to the preset air density as the air pressure correction coefficient. S2. Detect the actual wind speed of the cooling fan and calculate the wind speed correction coefficient; When 0.9 times the preset wind speed ≤ actual wind speed ≤ 1.1 times the preset wind speed, the wind speed correction coefficient is considered to be 1; S3. Based on the air pressure correction coefficient and the wind speed correction coefficient, and with a preset heat exchange target, correct the operating frequency of the fan; The rated heat exchange capacity of the cooling fan is 15kW, and the preset relationship between the fan operating frequency y and the wind speed v is as follows: ; The operating frequency correction formula for the fan is as follows: ； Where y1 is the corrected fan operating frequency; y0 is the preset fan operating frequency; k1 is the air pressure correction coefficient; k2 is the wind speed correction coefficient; c and d are constants; Step S2 specifically involves: S21. Calculate the preset target wind speed based on the preset heat exchange rate; S22. Detect the actual wind speed of the cooling fan, and use the ratio of the preset target wind speed to the actual wind speed as the wind speed correction coefficient. Step S23 is included after step S22: The wind speed correction coefficient is compared with a preset threshold. If the wind speed correction coefficient is greater than the preset threshold, a cooling fan blockage warning is issued.

2. The optimized control method for a cooling system's heat dissipation fan according to claim 1, characterized in that: Step S3 further includes the following steps: Determine whether the cooling fan is in low-noise mode. If yes, use the first preset frequency as the operating frequency; otherwise, use the second preset frequency as the operating frequency. The first preset frequency is less than the second preset frequency.

3. An optimized control terminal for a cooling system's heat dissipation fan, characterized in that: Includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs the following steps: S1. Detect the actual air pressure value at the air inlet of the cooling fan, calculate the actual air density based on the actual air pressure value, and use the ratio of the actual air density to the preset air density as the air pressure correction coefficient. S2. Detect the actual wind speed of the cooling fan and calculate the wind speed correction coefficient; When 0.9 times the preset wind speed ≤ actual wind speed ≤ 1.1 times the preset wind speed, the wind speed correction coefficient is considered to be 1; S3. Based on the air pressure correction coefficient and the wind speed correction coefficient, and with a preset heat exchange target, correct the operating frequency of the fan; The rated heat exchange capacity of the cooling fan is 15kW, and the preset relationship between the fan operating frequency y and the wind speed v is as follows: ; The operating frequency correction formula for the fan is as follows: ； Where y1 is the corrected fan operating frequency; y0 is the preset fan operating frequency; k1 is the air pressure correction coefficient; k2 is the wind speed correction coefficient; c and d are constants; Step S2 specifically involves: S21. Calculate the preset target wind speed based on the preset heat exchange rate; S22. Detect the actual wind speed of the cooling fan, and use the ratio of the preset target wind speed to the actual wind speed as the wind speed correction coefficient; Step S23 is included after step S22: The wind speed correction coefficient is compared with a preset threshold. If the wind speed correction coefficient is greater than the preset threshold, a warning of blockage of the cooling fan is issued.

4. The optimized control terminal for the cooling system's heat dissipation fan according to claim 3, characterized in that: Step S3 further includes the following steps: Determine whether the cooling fan is in low-noise mode. If yes, use the first preset frequency as the operating frequency; otherwise, use the second preset frequency as the operating frequency. The first preset frequency is less than the second preset frequency.

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