Temperature control system control method, device and storage medium under low air volume working condition

Abstract

The present application relates to the technical field of data processing, and discloses a temperature control system control method, equipment and storage medium under a low air volume working condition. The method comprises the following steps: obtaining a plurality of rotating speed sample combinations, controlling a closed cycle temperature control system to operate according to each rotating speed sample combination, obtaining corresponding air volume test combinations, thereby constructing a first fitting relationship between the air volume before a heat exchanger and the rotating speed of a bypass air fan and the rotating speed of a main air fan, and a second fitting relationship between the air volume of a main air duct and the rotating speed of a bypass air fan and the rotating speed of a main air fan through each rotating speed sample combination and the corresponding air volume test combination, and then obtaining a corresponding bypass air fan rotating speed demand value in combination with the air volume demand value before the heat exchanger and the air volume demand value of the main air duct, thereby improving the heat exchange capacity of the heat exchanger under the low air volume working condition without changing the air volume of the main air duct, and by determining the minimum demand of the bypass air fan, the overall energy consumption of the system is reduced, and the service life of the main air fan is improved.

Description

Technical Field

[0001] This invention relates to the field of data processing technology, and in particular to a temperature control system control method, device and storage medium under low airflow conditions. Background Technology

[0002] In a temperature control system, the overall surface heat transfer coefficient of an air-to-water heat exchanger is affected by both the air-side and water-side heat transfer coefficients. When the required heat exchange is large, the opening of the coolant flow regulating valve in the temperature control system will increase due to the influence of the control system itself. However, when the temperature control system needs to control the airflow, especially under low airflow conditions, the heat exchanger's heat exchange capacity will be significantly limited by the air-side heat transfer coefficient, resulting in a substantial reduction in the heat exchanger's heat exchange capacity.

[0003] In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a temperature control system method, device, and storage medium for low airflow conditions. This improves the heat exchanger's capacity under low airflow conditions without altering the main airflow, and reduces the output of the bypass fan, thereby reducing overall system energy consumption and extending the main fan's lifespan.

[0005] This invention provides a method for controlling a temperature control system under low airflow conditions, applied to a closed-loop temperature control system. The closed-loop temperature control system includes a main fan, a bypass fan, and a heat exchanger. The method includes:

[0006] Multiple speed sample combinations are obtained, wherein the speed sample combination includes the bypass fan speed sample value and the main fan speed sample value;

[0007] For each of the speed sample combinations, the closed-loop temperature control system is controlled based on the speed sample combination to obtain the corresponding air volume test combination, wherein the air volume test combination includes the air volume test value before the heat exchanger and the air volume test value of the main air duct.

[0008] Based on the various speed sample combinations and the corresponding air volume test combinations, a first fitting relationship between the air volume in front of the heat exchanger and the speed of the bypass fan and the speed of the main fan is constructed, as well as a second fitting relationship between the air volume in the main duct and the speed of the bypass fan and the speed of the main fan.

[0009] The required air volume values ​​before the heat exchanger and the required air volume values ​​of the main air duct are obtained. Based on the first fitting relationship, the second fitting relationship, the required air volume values ​​before the heat exchanger and the required air volume values ​​of the main air duct, the required speed value of the bypass fan is determined. The bypass fan is controlled by the required speed value of the bypass fan so that the heat exchanger meets the heat exchanger requirements corresponding to the required air volume values ​​of the main air duct.

[0010] This invention provides a temperature control system control device for low airflow conditions. The temperature control system control device for low airflow conditions includes a controller and a closed-loop temperature control system. The closed-loop temperature control system includes a main fan, a bypass fan, and a heat exchanger.

[0011] The heat exchanger is used to exchange heat with the input air;

[0012] The bypass fan is used to draw the air output from the heat exchanger back into the heat exchanger;

[0013] The main fan is used to provide the power source required for air flow in the closed-loop temperature control system, so that the air volume and flow direction of the main air duct of the closed-loop temperature control system meet the set requirements.

[0014] The controller is used to control the closed-loop temperature control system according to the steps of the temperature control system control method under low air volume conditions described in any embodiment, so as to obtain the bypass fan speed requirement value corresponding to the air volume requirement value in front of the heat exchanger and the air volume requirement value in the main air duct.

[0015] This invention provides a computer-readable storage medium that stores a program or instructions that cause a computer to execute the steps of the temperature control system control method under low airflow conditions described in any embodiment.

[0016] The embodiments of the present invention have the following technical effects:

[0017] By acquiring multiple speed sample combinations, and controlling the operation of the closed-loop temperature control system according to each speed sample combination, corresponding airflow test combinations are obtained. Thus, through each speed sample combination and its corresponding airflow test combination, a first fitting relationship is constructed between the airflow before the heat exchanger and the speeds of the bypass fan and main fan; a second fitting relationship is constructed between the airflow in the main duct and the speeds of the bypass fan and main fan. Furthermore, by combining the required airflow before the heat exchanger and the required airflow in the main duct, the corresponding required bypass fan speed is obtained, thereby determining the heat exchange parameters in the system. The operation of the bypass fan can be controlled by determining its required speed, thus ensuring that the heat exchanger meets the corresponding requirements. This method improves the heat exchanger's heat exchange capacity under low airflow conditions by drawing the air flowing through the heat exchanger back to the front of the heat exchanger through the bypass fan, without changing the airflow of the main air duct. Furthermore, a fitting relationship is constructed using sample values ​​and corresponding measurements to calculate the minimum requirement of the bypass fan, thereby minimizing the bypass fan output, reducing the overall energy consumption of the system, and extending the service life of the main fan. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a temperature control system control method under low airflow conditions provided by an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of a closed-loop temperature control system provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram illustrating the relationship between air-side flow velocity and total surface heat transfer coefficient according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] Figure 1 This is a flowchart illustrating a temperature control system control method under low airflow conditions, provided by an embodiment of the present invention. This method can be applied to a closed-loop temperature control system, which includes a main fan, a bypass fan, and a heat exchanger. See also... Figure 1 The specific control method for the temperature control system under low airflow conditions includes:

[0025] S110. Obtain multiple speed sample combinations, wherein the speed sample combination includes the bypass fan speed sample value and the main fan speed sample value.

[0026] In this embodiment of the invention, the closed-loop temperature control system can be composed of a main fan, a bypass fan, and a heat exchanger. The heat exchanger exchanges heat with the incoming air; the main fan provides the power source required for airflow in the closed-loop temperature control system, ensuring that the airflow volume and direction in the main duct meet set requirements (e.g., requirements for airflow volume and direction); the bypass fan can draw the air output from the heat exchanger back into the heat exchanger for further heat exchange.

[0027] For example, Figure 2 This is a schematic diagram of a closed-loop temperature control system provided in an embodiment of the present invention. The closed-loop temperature control system includes a main fan 1, a bypass fan 2, and a heat exchanger 3. To achieve temperature control, the system may also include a platinum resistance temperature measuring point 4. By controlling the operation of the closed-loop temperature control system, the temperature measured by the platinum resistance temperature measuring point is made to meet the expected target temperature. When the system is used for bench testing, it may also include a front-end heat exchanger 5. The front-end heat exchanger 5 serves as the test object, such as the heat exchanger under test in the bench test, or equipment with requirements for the operating environment. The front-end heat exchanger 5 generally has specific requirements for the temperature and airflow of the air entering it, and the temperature of the air generally changes after flowing through the front-end heat exchanger 5.

[0028] See Figure 2 The airflow direction in the closed-loop temperature control system is shown by the arrows in the figure. Taking one cycle of the airflow in this system as an example, the system is explained as follows: In one cycle, the airflow flows out from the main fan 1 at the set temperature and volume, passes through the front-end heat exchanger 5, and undergoes a temperature change after heat exchange with the front-end heat exchanger 5 (for example, the airflow was controlled at a set temperature of 30℃ by heat exchanger 3 before flowing through the front-end heat exchanger 5; the front-end heat exchanger 5 heats up due to the external heat source it is connected to, causing the airflow to rise from 30℃ to 35℃). Further, the airflow with the changed temperature flows to heat exchanger 3, undergoes heat exchange there, and the temperature is restored to the set temperature. During this process, the airflow in the main duct remains unchanged. Heat exchanger 3 is an air-to-water heat exchanger. The internal coolant can be connected to a constant-temperature water tank. A valve controls the flow rate of the coolant in the constant-temperature water tank to provide a cooling effect, while an electric heater in the pipeline adjusts the power to provide a heating effect.

[0029] At this point, the airflow temperature changes after passing through heat exchanger 3. Considering that the main fan 1 can provide variable air volume control, its air volume control range is approximately 300-15000 m³ / h. 3 Between / h, different air volumes have a significant impact on the air-side heat exchange performance of heat exchanger 3. A typical example is the heat exchange effect on the air side of a louvered heat exchanger, as shown in the following equation:

[0030] The Nusselt number of the air-side heat transfer surface of the louver fins is:

[0031] ;

[0032] The heat transfer coefficient of the louver fins on the air-side heat transfer surface is:

[0033] ;

[0034] In the formula, The Reynolds number on the air side of the fin. For fin thickness, The heat transfer factor for the air-side fins can be obtained by fitting an empirical formula. The spacing between the blinds. The Prandtl number on the air side of the fin. The thermal conductivity of air.

[0035] As can be seen from the above formula, the air velocity affects the Nusselt number by influencing the Reynolds number, and thus affects the heat transfer coefficient of the air side surface.

[0036] Furthermore, the overall surface heat transfer coefficient of an air-to-water heat exchanger is affected by both the air-side heat transfer coefficient and the water-side heat transfer coefficient, as shown in the following formula:

[0037] ;

[0038] In the formula, The total surface heat transfer coefficient is . The heat transfer coefficient of the heat transfer surface of the medium. The hydraulic diameter of the radiator flat tube. The hydraulic diameter of the radiator fin channels. denoted as the heat transfer coefficient of the air-side heat transfer surface.

[0039] When the required heat exchange is large, the opening of the coolant flow regulating valve of the temperature control system will be increased due to the influence of its own control system. However, at this time, the air volume may be low, and the heat exchanger's heat exchange capacity is greatly limited by the air-side heat transfer coefficient.

[0040] Figure 3 This is a schematic diagram illustrating the relationship between air-side flow velocity and total surface heat transfer coefficient provided in an embodiment of the present invention. Figure 3This demonstrates the influence of the air-side heat transfer coefficient on the total surface heat transfer coefficient of the heat exchanger under a constant flow rate. When the wind speed reaches a certain level, the heat exchanger's capacity is mainly affected by the water flow rate, especially when the wind speed is less than 1 m / s, at which point the heat exchange capacity will significantly decrease. Therefore, the function of the bypass fan 2 is to draw the air flowing through the heat exchanger 3 back to the front of the heat exchanger 3 when the main fan 1 has a low airflow. At this time, the forward airflow of the heat exchanger 3 equals the airflow of the main fan plus the airflow of the bypass fan. This way, the airflow in the main duct remains unchanged while improving the heat exchanger's capacity when the airflow in the main duct is low.

[0041] Therefore, it can be seen that after the airflow passes through the heat exchanger 3, if the current operating condition is a low wind speed, the bypass fan 2 can draw the airflow back to the heat exchanger 3 for heat exchange, thereby enhancing the air-side heat exchange capacity of the heat exchanger 3.

[0042] However, because the bypass fan 2 controls the airflow in a different direction than the main fan 1, the bypass fan 2 becomes an additional load on the main fan 1, requiring the main fan 1 to operate at a higher speed to provide the same airflow. If the bypass airflow provided by the bypass fan 2 is too large, it will reduce the service life of the main fan 1 and is also not conducive to saving equipment energy. At the same time, an excessively large bypass airflow has limited effect on improving the heat exchanger 3's heat exchange capacity, as it is mainly limited by the heat exchanger's water-side heat exchange capacity. In the initial stage of equipment selection, the selection of the bypass fan is also difficult to determine because the overall air pressure of the temperature control system duct is hard to predict.

[0043] Therefore, in this embodiment of the invention, in order to improve the heat exchange capacity of the heat exchanger by using a bypass fan while minimizing the output of the bypass fan, thereby reducing the overall energy consumption of the system and increasing the service life of the fan, the method provided in this embodiment of the invention can be used to determine the required speed value of the bypass fan, that is, to obtain the minimum speed requirement of the bypass fan.

[0044] Specifically, in this embodiment of the invention, multiple debugging schemes, i.e. multiple speed sample combinations, can be obtained by sampling to obtain the air volume test value of the bypass fan and the air volume test value of the main fan under each debugging scheme.

[0045] In one specific implementation, obtaining multiple speed sample combinations includes: determining the speed range of the bypass fan and the speed range of the main fan; and obtaining multiple speed sample combinations by Latin hypercube sampling based on the speed range of the bypass fan and the speed range of the main fan.

[0046] In this process, after determining the speed range of the bypass fan and the speed range of the main fan, multiple sample values ​​can be extracted from the speed range of the bypass fan and the speed range of the main fan using Latin hypercube sampling, and then combined to obtain multiple speed sample combinations.

[0047] Optionally, based on the speed range of the bypass fan and the speed range of the main fan, multiple speed sample combinations are obtained through Latin hypercube sampling, including: obtaining multiple bypass fan speed sample values ​​at equal intervals within the speed range of the bypass fan, and obtaining multiple main fan speed sample values ​​at equal intervals within the speed range of the main fan; arranging the multiple bypass fan speed sample values ​​in order of speed to obtain a bypass fan speed list, and randomly arranging the multiple main fan speed sample values ​​to obtain a main fan speed list; and combining the bypass fan speed sample values ​​in the bypass fan speed list and the main fan speed sample values ​​in the main fan speed list in pairs to obtain multiple speed sample combinations.

[0048] The sampling intervals within the bypass fan's speed range and within the main fan's speed range can be determined based on the number of commissioning schemes. Specifically, multiple bypass fan speed samples can be taken at equal intervals, starting from the minimum value within the bypass fan's speed range, and multiple main fan speed samples can be taken at equal intervals, starting from the minimum value within the main fan's speed range. It should be noted that the number of bypass fan speed samples is the same as the number of main fan speed samples.

[0049] Furthermore, the bypass fan speed sample values ​​can be sorted in ascending order to obtain a bypass fan speed list. Additionally, the main fan speed sample values ​​can be randomly arranged to obtain a main fan speed list. The speed sample values ​​at the same position in the bypass fan speed list and the main fan speed list can be combined to obtain multiple speed sample combinations.

[0050] Through the above implementation method, sampling of the bypass fan speed sample value and the main fan speed sample value is realized, and then combined to obtain multiple debugging schemes, namely speed sample combinations, which ensures the diversity of debugging schemes and thus guarantees the accuracy of the fitting relationship.

[0051] It should be noted that the sampling method is not limited to the Latin hypercube sampling described above; other sampling methods can also be used, and the embodiments of the present invention do not limit this. For example, other sampling methods, such as the Monte Carlo method, the optimized Latin hypercube method, or the orthogonal array method, can also be used to construct a sample distribution map of the bypass fan speed and the main fan speed, and then determine multiple speed sample combinations through the sample distribution map.

[0052] S120. For each speed sample combination, control the operation of the closed-loop temperature control system based on the speed sample combination to obtain the corresponding air volume test combination. The air volume test combination includes the air volume test value before the heat exchanger and the air volume test value of the main air duct.

[0053] Specifically, for each speed sample combination, the main fan in the closed-loop temperature control system can be controlled to operate according to the main fan speed sample value in the speed sample combination, and the bypass fan can be controlled to operate according to the bypass fan speed sample value in the speed sample combination, so as to obtain the test value of the air volume in front of the heat exchanger and the test value of the air volume in the main air duct under that speed sample combination.

[0054] The air volume before the heat exchanger can be the air volume input to the heat exchanger, specifically the sum of the main fan air volume and the bypass fan air volume. The main duct air volume can be understood as the main fan air volume.

[0055] S130. Based on the sample combinations of various rotation speeds and the corresponding air volume test combinations, construct the first fitting relationship between the air volume in front of the heat exchanger and the rotation speed of the bypass fan and the main fan, and the second fitting relationship between the air volume in the main duct and the rotation speed of the bypass fan and the main fan.

[0056] Specifically, based on each combination of rotational speed samples and the corresponding combination of airflow tests, a first fitting relationship can be established between the airflow before the heat exchanger and the rotational speed of the bypass fan and the rotational speed of the main fan. Furthermore, a second fitting relationship can be established between the airflow in the main duct and the rotational speed of the bypass fan and the rotational speed of the main fan.

[0057] In one example, based on each combination of rotational speed samples and the corresponding combination of airflow tests, a first fitting relationship is constructed between the airflow before the heat exchanger and the rotational speed of the bypass fan and the rotational speed of the main fan. This includes: taking the airflow before the heat exchanger as the first dependent variable, and taking the rotational speed of the bypass fan and the rotational speed of the main fan as the first and second variables, respectively; constructing a first response surface between the first dependent variable and the first and second variables based on the test values ​​of the airflow before the heat exchanger in each airflow test combination, and the sample values ​​of the bypass fan rotational speed and the main fan rotational speed in each combination of rotational speed samples; and determining the quadratic relationship between the first dependent variable and the first and second variables based on the first response surface to obtain the first fitting relationship.

[0058] That is, the air volume before the heat exchanger can be taken as the first dependent variable, and the test value of the air volume before the heat exchanger in each air volume test combination is the various values ​​of the first dependent variable; the bypass fan speed can be taken as the first variable, and the main fan speed can be taken as the second variable, and the sample value of the bypass fan speed in each speed sample combination is the various values ​​of the first variable, and the sample value of the main fan speed is the various values ​​of the second variable.

[0059] Furthermore, based on the measured airflow values ​​before each heat exchanger, the sample values ​​of the rotational speeds of each bypass fan, and the sample values ​​of the rotational speeds of each main fan, the first response surface can be fitted using the response surface model fitting method to obtain the first response surface between the first dependent variable and the first and second variables. Thus, the quadratic relationship between the first dependent variable and the first and second variables can be obtained based on the first response surface, thereby obtaining the first fitting relationship.

[0060] In one example, based on each combination of rotational speed samples and the corresponding combination of airflow tests, a second fitting relationship is constructed between the main duct airflow and the bypass fan speed and the main fan speed. This includes: taking the main duct airflow as the second dependent variable, constructing a second response surface between the second dependent variable and the first and second variables based on the main duct airflow test values ​​in each airflow test combination, and the bypass fan speed sample values ​​and the main fan speed sample values ​​in each combination of rotational speed samples; and determining the quadratic relationship between the second dependent variable and the first and second variables based on the second response surface to obtain the second fitting relationship.

[0061] That is, the air volume of the main air duct can be used as the second dependent variable, and the test value of the air volume of the main air duct in each air volume test combination is the various values ​​of the second dependent variable.

[0062] Furthermore, based on the test values ​​of the air volume of each main air duct, the sample values ​​of the rotational speed of each bypass fan, and the sample values ​​of the rotational speed of each main fan, the second response surface can be fitted using the response surface model fitting method to obtain the second response surface between the second dependent variable and the first and second variables. Thus, the quadratic relationship between the second dependent variable and the first and second variables can be obtained from the second response surface, thereby obtaining the second fitting relationship.

[0063] In the example above, the fitting relationship is obtained by fitting the response surface between the test value and the sample value, which ensures the accuracy of the fitting relationship and facilitates the accurate determination of the bypass fan speed requirement.

[0064] S140. Obtain the required air volume value before the heat exchanger and the required air volume value of the main air duct. Based on the first fitting relationship, the second fitting relationship, the required air volume value before the heat exchanger and the required air volume value of the main air duct, determine the required speed value of the bypass fan. Control the bypass fan through the required speed value of the bypass fan so that the heat exchanger meets the heat exchanger requirements corresponding to the required air volume value of the main air duct.

[0065] The required airflow before the heat exchanger can be the minimum airflow before the heat exchanger determined based on the heat exchange requirements. The required airflow in the main duct can be the minimum airflow in the main duct determined based on the airflow requirements of the upstream heat exchanger.

[0066] Specifically, after obtaining the required air volume in front of the heat exchanger and the required air volume in the main duct corresponding to the current heat exchange demand, the required air volume in front of the heat exchanger can be obtained by combining the first fitting relationship between the air volume in front of the heat exchanger and the speed of the bypass fan and the speed of the main fan, and the second fitting relationship between the air volume in the main duct and the speed of the bypass fan and the speed of the main fan.

[0067] Optionally, based on the first fitting relationship, the second fitting relationship, the air volume requirement value before the heat exchanger, and the air volume requirement value of the main air duct, the bypass fan speed requirement value is determined, including: substituting the air volume requirement value before the heat exchanger and the air volume requirement value of the main air duct into the quadratic relationship corresponding to the first fitting relationship and the second fitting relationship; solving the quadratic relationship after substitution to obtain the solution results of the first variable and the second variable; and determining the bypass fan speed requirement value based on the solution result of the first variable.

[0068] Specifically, the required airflow before the heat exchanger and the required airflow in the main duct can be used as known quantities of the first and second dependent variables, respectively. These are substituted into the quadratic equations corresponding to the first and second fitting relationships, and the resulting equations are solved to obtain the solutions for the first and second variables. The solution for the first variable is then used as the required bypass fan speed. This optional implementation method allows for the accurate determination of the required bypass fan speed.

[0069] The bypass fan speed requirement can be the minimum speed of the bypass fan under the heat exchange requirement corresponding to the air volume requirement in front of the heat exchanger; the bypass fan speed requirement can be in rpm or in % (i.e., the percentage between the bypass fan speed requirement and the maximum value in the speed range).

[0070] Furthermore, after obtaining the required speed value of the bypass fan, the operation of the bypass fan in the closed-loop temperature control system can be controlled based on this required speed value. For example, it can be operated according to the required speed value of the bypass fan (in engineering applications, the margin can be slightly increased, i.e., slightly higher than the required speed value of the bypass fan). At this time, the heat exchanger can meet the heat exchanger requirements corresponding to the required air volume of the main air duct.

[0071] Optionally, there are multiple required air volume values ​​before the heat exchanger, and different required air volume values ​​before the heat exchanger correspond to different heat exchange requirements.

[0072] In this embodiment of the invention, different air volume requirements for the heat exchanger can be obtained for different heat exchange needs, and then the corresponding bypass fan speed requirements can be determined respectively, so as to determine the minimum speed of the bypass fan in the closed-loop temperature control system in the bench test under different heat exchange needs.

[0073] Through the above process, the minimum rotational speed of the bypass fan under different heat exchange requirements is calibrated. This can be applied to heat dissipation system test benches or other closed-loop temperature control systems (including main fans, bypass fans, and heat exchangers) with airflow control functions. This enables the heat exchanger to have sufficient air-side heat exchange capacity even under low airflow conditions. At the same time, it can reduce the rotational speed of the main fan when it outputs the same airflow, reduce the impact of the bypass fan on the energy consumption of the main fan, and extend the service life of the main fan.

[0074] This invention has the following technical effects: By acquiring multiple speed sample combinations, and controlling the operation of a closed-loop temperature control system according to each speed sample combination, a corresponding airflow test combination is obtained. Then, through each speed sample combination and the corresponding airflow test combination, a first fitting relationship is constructed between the airflow before the heat exchanger and the speed of the bypass fan and the main fan, and a second fitting relationship is constructed between the airflow in the main duct and the speed of the bypass fan and the main fan. Furthermore, by combining the required airflow before the heat exchanger and the required airflow in the main duct, the corresponding required speed value of the bypass fan is obtained. This required speed value of the bypass fan can be used to control the operation of the bypass fan, ensuring that the heat exchanger meets the corresponding requirements. This method, by determining the required speed of the bypass fan, draws the air flowing through the heat exchanger back to the front of the heat exchanger through the bypass fan, improving the heat exchange capacity of the heat exchanger under low airflow conditions without changing the airflow in the main duct. Furthermore, by constructing a fitting relationship through sample values ​​and corresponding measured values, the minimum requirement of the bypass fan is calculated, minimizing the output of the bypass fan, thereby reducing the overall energy consumption of the system and increasing the service life of the main fan.

[0075] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0076] This invention also provides a temperature control system control device for low air volume conditions. The temperature control system control device for low air volume conditions includes a controller and a closed-loop temperature control system. The closed-loop temperature control system includes a main fan, a bypass fan, and a heat exchanger.

[0077] The heat exchanger is used to exchange heat with the input air;

[0078] The bypass fan is used to draw the air output from the heat exchanger back into the heat exchanger;

[0079] The main fan is used to provide the power source required for air flow in the closed-loop temperature control system, so that the air volume and flow direction of the main air duct of the closed-loop temperature control system meet the set requirements.

[0080] The controller is used to control the closed-loop temperature control system according to the steps of the temperature control system control method under low air volume conditions provided in any of the above embodiments, so as to obtain the bypass fan speed requirement value corresponding to the air volume requirement value in front of the heat exchanger and the air volume requirement value in the main air duct.

[0081] Optionally, the closed-loop temperature control system also includes a front-end heat exchanger and a platinum resistance temperature measuring point, wherein: the front-end heat exchanger is a heat exchanger with specific requirements for the air and airflow in front, used to exchange heat with the air passing through; the platinum resistance temperature measuring point is used to measure the temperature of the air before passing through the front-end heat exchanger, so that it meets the temperature requirements of the front-end heat exchanger for the air in front.

[0082] The controller in the temperature control system control device under low air volume conditions in the above embodiments can implement the corresponding temperature control system control method under low air volume conditions in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0083] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. For example... Figure 4 As shown, the electronic device 400 includes one or more processors 401 and memory 402.

[0084] The processor 401 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 400 to perform desired functions.

[0085] The memory 402 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 401 may execute the program instructions to implement the temperature control system control method under low airflow conditions in any embodiment of the present invention described above, and / or other desired functions. Various contents such as initial external parameters and thresholds may also be stored in the computer-readable storage medium.

[0086] In one example, the electronic device 400 may further include an input device 403 and an output device 404, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown). The input device 403 may include, for example, a keyboard, a mouse, etc. The output device 404 may output various information to the outside, including warning messages, braking force, etc. The output device 404 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0087] Of course, for the sake of simplicity, Figure 4 Only some of the components of the electronic device 400 relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device 400 may include any other suitable components depending on the specific application.

[0088] In addition to the methods and devices described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps of the temperature control system control method under low airflow conditions provided in any embodiment of the present invention.

[0089] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0090] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the temperature control system control method under low airflow conditions provided in any embodiment of the present invention.

[0091] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0092] It should be noted that the terminology used in this invention is for describing specific embodiments only and is not intended to limit the scope of this application. As shown in this specification, unless the context clearly indicates otherwise, words such as "a," "an," "an," and / or "the" do not specifically refer to the singular and may include the plural. The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element.

[0093] It should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a temperature control system under low airflow conditions, characterized in that, The method is applied to a closed-loop temperature control system, which includes a main fan, a bypass fan, and a heat exchanger. Multiple speed sample combinations are obtained, wherein the speed sample combination includes the bypass fan speed sample value and the main fan speed sample value; For each of the speed sample combinations, the closed-loop temperature control system is controlled based on the speed sample combination to obtain the corresponding air volume test combination, wherein the air volume test combination includes the air volume test value before the heat exchanger and the air volume test value of the main air duct. Based on the various speed sample combinations and the corresponding air volume test combinations, a first fitting relationship between the air volume in front of the heat exchanger and the speed of the bypass fan and the speed of the main fan is constructed, as well as a second fitting relationship between the air volume in the main duct and the speed of the bypass fan and the speed of the main fan. The required air volume in front of the heat exchanger and the required air volume in the main air duct are obtained. Based on the first fitting relationship, the second fitting relationship, the required air volume in front of the heat exchanger and the required air volume in the main air duct, the required speed of the bypass fan is determined. The bypass fan is controlled by the required speed of the bypass fan so that the heat exchanger meets the heat exchanger requirements corresponding to the required air volume in the main air duct. The acquisition of multiple speed sample combinations includes: Determine the speed range of the bypass fan and the speed range of the main fan; Multiple sample values ​​of the rotational speed of the bypass fan are obtained at equal intervals within the rotational speed range of the bypass fan, and multiple sample values ​​of the rotational speed of the main fan are obtained at equal intervals within the rotational speed range of the main fan. The sample values ​​of multiple bypass fan speeds are arranged sequentially according to their rotational speed to obtain a list of bypass fan speeds. The sample values ​​of multiple main fan speeds are then randomly arranged to obtain a list of main fan speeds. The sample values ​​of the bypass fan speed in the bypass fan speed list and the sample values ​​of the main fan speed in the main fan speed list are combined in pairs to obtain multiple speed sample combinations.

2. The method according to claim 1, characterized in that, The first fitting relationship between the airflow before the heat exchanger and the bypass fan speed and main fan speed is constructed based on each of the speed sample combinations and the corresponding airflow test combinations, including: The air volume in front of the heat exchanger is taken as the first dependent variable, and the speed of the bypass fan and the speed of the main fan are taken as the first and second variables, respectively. Based on the air volume test values ​​in front of the heat exchanger in each air volume test combination, and the sample values ​​of the bypass fan speed and the main fan speed in each speed sample combination, a first response surface is constructed between the first dependent variable and the first variable and the second variable. Based on the first response surface, the quadratic relationship between the first dependent variable and the first and second variables is determined, and the first fitting relationship is obtained.

3. The method according to claim 2, characterized in that, Based on the aforementioned speed sample combinations and corresponding airflow test combinations, a second fitting relationship is constructed between the main duct airflow and the bypass fan speed and the main fan speed, including: Using the main air duct air volume as the second dependent variable, and based on the main air duct air volume test value in each of the air volume test combinations, and the bypass fan speed sample value and main fan speed sample value in each of the speed sample combinations, a second response surface is constructed between the second dependent variable and the first and second variables. Based on the second response surface, the quadratic relationship between the second dependent variable and the first and second variables is determined, and the second fitting relationship is obtained.

4. The method according to claim 3, characterized in that, The step of determining the bypass fan speed requirement based on the first fitting relationship, the second fitting relationship, the air volume requirement value before the heat exchanger, and the air volume requirement value of the main air duct includes: Substitute the required air volume in front of the heat exchanger and the required air volume in the main air duct into the quadratic relational expressions corresponding to the first and second fitting relations; Solve the quadratic relation after substitution to obtain the solution results for the first variable and the second variable. Determine the required speed value of the bypass fan based on the solution result of the first variable.

5. The method according to claim 1, characterized in that, There are multiple required airflow values ​​before the heat exchanger, and different required airflow values ​​before the heat exchanger correspond to different heat exchange requirements.

6. A temperature control system control device for low airflow conditions, characterized in that, The temperature control system control equipment under low air volume conditions includes a controller and a closed-loop temperature control system. The closed-loop temperature control system includes a main fan, a bypass fan, and a heat exchanger. The heat exchanger is used to exchange heat with the input air; The bypass fan is used to draw the air output from the heat exchanger back into the heat exchanger; The main fan is used to provide the power source required for air flow in the closed-loop temperature control system, so that the air volume and flow direction of the main air duct of the closed-loop temperature control system meet the set requirements. The controller is used to control the closed-loop temperature control system according to the steps of the temperature control system control method under low air volume conditions according to any one of claims 1 to 5, and to obtain the bypass fan speed requirement value corresponding to the air volume requirement value in front of the heat exchanger and the air volume requirement value in the main air duct.

7. The device according to claim 6, characterized in that, The closed-loop temperature control system also includes a front-end heat exchanger and platinum resistance temperature measuring points, wherein; The aforementioned front-end heat exchanger is a heat exchanger with specific requirements for the air and airflow in front, used to exchange heat with the passing air. The platinum resistance temperature measuring point is used to measure the temperature of the air before it passes through the front-end heat exchanger, so that it meets the temperature requirements of the front-end heat exchanger for the air in front.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program or instructions that cause a computer to perform the steps of the temperature control system control method under low airflow conditions as described in any one of claims 1 to 5.

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