Anti-frosting control method, system and controller for a climatic wind tunnel

Abstract

This invention discloses a method, system, and controller for preventing frost formation in a climate wind tunnel. The climate wind tunnel includes a heat exchanger and a fan. The method includes: detecting the lowest surface temperature of the heat exchanger; when the lowest surface temperature is greater than or equal to a preset temperature threshold, controlling the fan to gradually cool the heat exchanger; and when the lowest surface temperature is less than the preset temperature threshold, controlling the fan to lower the wind tunnel temperature to the target experimental temperature. This method, by gradually cooling the heat exchanger and using constant-temperature, strong-air dehumidification when the lowest surface temperature is greater than or equal to the preset temperature threshold, dehumidifies the inside of the wind tunnel before frost forms. When the lowest surface temperature is less than the preset temperature threshold, the wind tunnel temperature is lowered to the target experimental temperature. This method prevents ice buildup on the heat exchanger and solves the problems of frost formation and blockage on the heat exchanger fins in the climate wind tunnel.

Description

Technical Field

[0001] This invention relates to the field of meteorological environment artificial simulation technology, and in particular to a climate wind tunnel anti-frost control method, system and controller. Background Technology

[0002] A climate wind tunnel is a low-speed wind tunnel device that can simulate meteorological conditions such as high and low temperatures, freezing rain, snowfall, and icing. The simulation of low temperatures, freezing rain, snowfall, and icing inside the tunnel requires a recirculation wind tunnel mode, where circulating air is continuously cooled through a heat exchanger.

[0003] The heat exchanger is typically located before the stable contraction section and after the power section fan. When the initial relative humidity of the wind tunnel is high, or during snowfall tests, the air reaching the heat exchanger is usually saturated and humid. After being cooled by the heat exchanger fins, a thick frost layer forms on the fin surface, clogging the heat exchanger, increasing the pressure difference across the heat exchanger, and increasing the fan load. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to propose a method for preventing frost formation in climate wind tunnels, which avoids ice buildup on heat exchangers and solves the problems of frost formation and blockage on the surface of climate wind tunnel heat exchanger fins.

[0005] The second objective of this invention is to provide a climate wind tunnel anti-frost control system.

[0006] The third objective of this invention is to provide a controller.

[0007] To achieve the above objectives, a first aspect of the present invention provides a method for preventing frost formation in a climate wind tunnel. The climate wind tunnel includes a heat exchanger and a fan. The method includes: detecting the lowest surface temperature of the heat exchanger; when the lowest surface temperature is greater than or equal to a preset temperature threshold, controlling the fan to gradually cool the heat exchanger; and when the lowest surface temperature is less than the preset temperature threshold, controlling the fan to reduce the wind tunnel temperature of the climate wind tunnel to a target experimental temperature.

[0008] According to the climate wind tunnel anti-frost control method of the present invention, when the lowest surface temperature of the heat exchanger is greater than or equal to a preset temperature threshold, the heat exchanger is gradually cooled and subjected to constant-temperature strong airflow for dehumidification, so that the heat exchanger completes the dehumidification of the wind tunnel interior before frost forms. When the lowest surface temperature of the heat exchanger is less than the preset temperature threshold, the wind tunnel temperature is reduced to the target experimental temperature. The method of the present invention does not cause icing on the heat exchanger, solving the problems of frost formation and blockage on the surface of the heat exchanger fins in the climate wind tunnel.

[0009] In addition, the climate wind tunnel anti-frost control method proposed in the above embodiments of the present invention may also have the following additional technical features:

[0010] According to one embodiment of the present invention, controlling the fan to gradually cool the heat exchanger includes: controlling the fan to run at a first preset speed to perform micro-air pre-cooling of the heat exchanger; whenever the minimum surface temperature decreases by a preset temperature, controlling the fan to run at a second preset speed for a preset time to perform constant temperature strong air drainage of the heat exchanger, and returning to the step of controlling the fan to run at the first preset speed, wherein the second preset speed is greater than the first preset speed.

[0011] According to one embodiment of the present invention, the second preset rotational speed is a fan speed that makes the wind tunnel wind speed at the wind tunnel nozzle greater than the preset wind tunnel wind speed, and the preset wind tunnel wind speed is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area.

[0012] According to one embodiment of the present invention, the preset time is determined by the wind tunnel wind speed and the total flow path length of the climate wind tunnel.

[0013] According to one embodiment of the present invention, controlling the wind tunnel temperature of the climate wind tunnel to drop to the target experimental temperature includes: controlling the fan to run at a third preset speed for low-temperature precooling.

[0014] According to one embodiment of the present invention, the first preset rotational speed is the fan speed that makes the wind speed at the wind tunnel nozzle less than 2.5 m / h.

[0015] To achieve the above objectives, a second aspect of the present invention provides a climate wind tunnel anti-frost control system. The climate wind tunnel includes a heat exchanger and a fan. The system includes: a temperature sensor array disposed on the surface of the heat exchanger for collecting the surface temperature of the heat exchanger; and a controller connected to the temperature sensors for obtaining a minimum surface temperature based on the surface temperature, and controlling the fan speed to gradually cool the climate wind tunnel when the minimum surface temperature is greater than or equal to a preset temperature threshold, and controlling the fan speed to reduce the wind tunnel temperature to a target experimental temperature when the minimum surface temperature is less than the preset temperature threshold.

[0016] In addition, the climate wind tunnel anti-frost control system proposed in the above embodiments of the present invention may also have the following additional technical features:

[0017] According to one embodiment of the present invention, the controller is configured to: control the fan to run at a first preset speed for heat exchanger pre-cooling by a light breeze; whenever the minimum surface temperature decreases by a preset temperature, control the fan to run at a second preset speed for a preset time for heat exchanger constant temperature strong air drainage, and return to the step of controlling the fan to run at the first preset speed, wherein the second preset speed is greater than the first preset speed.

[0018] According to one embodiment of the present invention, the system further includes: a wind speed sensor, connected to the controller and located at the wind tunnel nozzle of the climate wind tunnel, for collecting the wind tunnel wind speed of the climate wind tunnel; a timer, connected to the controller and located at the wind tunnel nozzle of the climate wind tunnel, for calculating the duration during which the wind tunnel wind speed at the wind tunnel nozzle is greater than or equal to a preset wind tunnel wind speed; the second preset rotational speed is the fan speed at which the wind tunnel wind speed at the wind tunnel nozzle is greater than the preset wind tunnel wind speed, the preset wind tunnel wind speed being determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area; the preset time being determined by the wind tunnel wind speed and the total flow length of the climate wind tunnel.

[0019] To achieve the above objectives, a third aspect of the present invention provides a controller, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the climate wind tunnel anti-frost control method as proposed in the first aspect of the present invention.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is a flowchart of a climate wind tunnel anti-frost control method according to an embodiment of the present invention;

[0022] Figure 2 This is a flowchart of a control fan for step-by-step cooling of a heat exchanger according to an embodiment of the present invention;

[0023] Figure 3 This is a flowchart of a specific embodiment of the climate wind tunnel anti-frost control method of the present invention;

[0024] Figure 4 This is a schematic diagram of a climate wind tunnel anti-frost control system according to an embodiment of the present invention;

[0025] Figure 5 This is a structural block diagram of the controller according to an embodiment of the present invention. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is in conjunction with the instruction manual appendix. Figure 1-5 The present invention provides a detailed description of the climate wind tunnel anti-frost control method, system, and controller according to specific implementation methods.

[0028] The anti-frost control method for climate wind tunnels according to embodiments of the present invention is used in climate wind tunnels, which may include heat exchangers and fans.

[0029] Figure 1 This is a flowchart of a climate wind tunnel anti-frost control method according to an embodiment of the present invention. Figure 1 As shown, the methods for preventing frost formation in climate wind tunnels include:

[0030] S101, detects the lowest surface temperature of the heat exchanger.

[0031] It is feasible to install a temperature sensor matrix on the surface of the heat exchanger and use the temperature sensor matrix to collect the surface temperature of the heat exchanger. Based on the surface temperature of the heat exchanger collected by the temperature sensor matrix, the minimum surface temperature of the heat exchanger can be determined.

[0032] In this embodiment of the invention, the lowest surface temperature of the heat exchanger is taken as the characteristic surface temperature of the heat exchanger, which can effectively prevent ice formation at any point on the surface of the heat exchanger.

[0033] S102, when the lowest surface temperature is greater than or equal to the preset temperature threshold, controls the fan to gradually cool the heat exchanger.

[0034] To prevent the formation of a thick frost layer on the surface of the heat exchanger fins after the saturated humid air cools down during snowfall tests due to high initial relative humidity in the wind tunnel, and to prevent ice buildup on the heat exchanger, this invention employs a step-by-step cooling process and constant-temperature forced-air dehumidification when the lowest surface temperature of the heat exchanger is greater than or equal to a preset temperature threshold. This ensures that the heat exchanger dehumidifies the saturated humid air inside the wind tunnel before frost forms.

[0035] S103, when the lowest surface temperature is less than the preset temperature threshold, control the fan to reduce the wind tunnel temperature of the climate wind tunnel to the target experimental temperature.

[0036] Since the absolute humidity inside the wind tunnel has been reduced to a very small value when the minimum surface temperature of the heat exchanger is greater than or equal to the preset temperature threshold, when the minimum surface temperature of the heat exchanger is less than the preset temperature threshold, lowering the wind tunnel temperature of the climate wind tunnel to the target experimental temperature will basically not cause ice formation on the heat exchanger, thus solving the problem of frost formation and blockage on the surface of the heat exchanger fins in the climate wind tunnel.

[0037] In this embodiment of the invention, the preset temperature threshold can be set according to work requirements.

[0038] In one embodiment of the present invention, such as Figure 2 As shown, controlling the fan to cool the heat exchanger in stages can include:

[0039] S201, control the fan to run at the first preset speed to perform micro-air pre-cooling of the heat exchanger;

[0040] S202, whenever the minimum surface temperature decreases by a preset temperature, the control fan runs at a second preset speed for a preset time to perform constant temperature forced air drainage of the heat exchanger, and then returns to the step of controlling the fan to run at a first preset speed, wherein the second preset speed is greater than the first preset speed.

[0041] To dehumidify the saturated humid air inside the wind tunnel, this embodiment of the invention performs step-by-step cooling with gentle breeze pre-cooling and constant-temperature strong-wind dehumidification on the heat exchanger.

[0042] Specifically, the fan is controlled to operate at a first preset speed. The heat exchanger exchanges heat with the saturated humid air at this wind tunnel speed, and a light pre-cooling effect is applied to the heat exchanger fins, allowing a water film to form. To prevent frost formation on the heat exchanger fins, the minimum surface temperature of the heat exchanger is monitored to determine if it has decreased below a preset temperature. If the preset temperature has not decreased, it indicates that frost will not form on the heat exchanger fins under these conditions, and the fan can continue operating at the first preset speed. If the preset temperature has decreased, to prevent frost formation, the fan is controlled to operate at a second preset speed for a preset time to provide constant-temperature, strong-air dehumidification of the heat exchanger surface. This cycle is repeated to dehumidify the saturated humid air inside the wind tunnel.

[0043] In one embodiment of the present invention, the first preset rotational speed is the fan speed that makes the wind speed at the wind tunnel nozzle less than 2.5 m / h.

[0044] It is feasible to operate the fan at a speed that keeps the wind speed at the wind tunnel nozzle below 2.5 m / h, so as to pre-cool the heat exchanger with a light breeze, form a water film on the surface of the heat exchanger fins, and further conduct constant temperature strong wind drainage on the heat exchanger according to whether the preset temperature is lowered based on the lowest surface temperature, so as to prevent the formation of a frost layer on the surface of the heat exchanger fins.

[0045] In one embodiment of the present invention, the second preset rotational speed is the fan speed at which the wind tunnel wind speed at the wind tunnel nozzle is greater than the preset wind tunnel wind speed. The preset wind tunnel wind speed is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area.

[0046] In one embodiment of the present invention, the preset time is determined by the wind tunnel wind speed and the total flow length of the climate wind tunnel.

[0047] In this embodiment of the invention, the preset wind tunnel velocity is the wind tunnel velocity required to achieve hydrophobicity on the heat exchanger surface. The preset wind tunnel velocity is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area. The preset time is determined by the wind tunnel velocity and the total flow path length of the climate wind tunnel, ensuring that the heat exchanger surface does not cool down when the fan operates at a second preset speed (a fan speed at the wind tunnel nozzle where the wind tunnel velocity is greater than the preset wind tunnel velocity) for a preset time.

[0048] Specifically, the wind tunnel wind speed V (m / s) for each drainage process is determined by the following formula:

[0049]

[0050] Where d is the heat exchanger fin spacing (m), A n Let A be the area of ​​the wind tunnel nozzle. ex For heat exchanger area, This is to preset the wind tunnel wind speed.

[0051] Specifically, the preset time t(s) is determined by the following formula:

[0052]

[0053] Where V is the wind tunnel wind speed (m / s) and L is the total length of the wind tunnel (m).

[0054] As can be seen from the formula for the preset time t, when the fan operates at the second preset speed for the preset time, the humid air in the climate wind tunnel does not circulate around the entire climate wind tunnel, thus achieving constant temperature, strong wind, and water drainage in the heat exchanger.

[0055] In one embodiment of the present invention, controlling the wind tunnel temperature to drop to the target experimental temperature may include:

[0056] The fan is controlled to run at the third preset speed for low-temperature precooling.

[0057] Specifically, the fan is controlled to run at a third preset speed, and the heat exchanger is further cooled to reduce the wind tunnel temperature to a lower target experimental temperature.

[0058] As a specific embodiment, such as Figure 3As shown, the lowest surface temperature of the heat exchanger is detected. If the lowest surface temperature is ≥ -5℃ (preset temperature threshold), the fan is controlled to run at a first preset speed, initiating a gradual cooling pre-cooling stage for the heat exchanger. Simultaneously, the lowest surface temperature is monitored to ensure it is decreasing below the preset temperature. For every 1℃ decrease in surface temperature from the initial temperature (preset temperature), a constant-temperature, strong-air drainage process is initiated, i.e., the fan is controlled to run at a second preset speed for a preset time to perform constant-temperature, strong-air drainage. If the lowest surface temperature is < -5℃, the system enters the low-temperature subcooling stage. In the low-temperature subcooling stage (lowest surface temperature < -5℃), the heat exchanger is further cooled by controlling the fan to run at a third preset speed, lowering the wind tunnel temperature to an even lower target experimental temperature.

[0059] The climate wind tunnel low-temperature start-up anti-frost control method of this invention includes a start-up process comprising a heat exchanger stage of gradual cooling with gentle airflow pre-cooling, a stage of constant temperature and strong airflow for each heat exchanger stage, and a low-temperature subcooling stage. When the surface temperature of the heat exchanger is above -5°C, a gradual cooling with gentle airflow and a strong airflow for the heat exchanger are alternately cyclical, completing the dehumidification of the wind tunnel interior before frost forms. When the surface temperature of the heat exchanger is below -5°C, low-temperature subcooling is performed to lower the wind tunnel temperature to an even lower experimental temperature. At this point, the absolute humidity inside the wind tunnel has been reduced to a very low level due to the previous dehumidification, and ice formation on the heat exchanger is virtually eliminated, thus solving the problem of frost formation and blockage on the surface of the climate wind tunnel heat exchanger fins.

[0060] The climate wind tunnel anti-frost control method of this invention involves gradually cooling the heat exchanger and applying constant-temperature strong airflow for dehumidification when the lowest surface temperature of the heat exchanger is greater than or equal to a preset temperature threshold. This dehumidifies the interior of the wind tunnel before frost forms. When the lowest surface temperature of the heat exchanger is less than the preset temperature threshold, the wind tunnel temperature is reduced to the target experimental temperature. This method eliminates the problem of ice buildup on the heat exchanger, thus solving the issues of frost formation and blockage on the heat exchanger fins in climate wind tunnels.

[0061] This invention provides a climate wind tunnel anti-frost control system.

[0062] The climate wind tunnel anti-frost control system of this invention is used in a climate wind tunnel, which may include a heat exchanger and a fan.

[0063] Figure 4 This is a schematic diagram of a climate wind tunnel anti-frost control system according to an embodiment of the present invention. Figure 4 As shown, the climate wind tunnel anti-frost control system 100 may include:

[0064] Temperature sensor array 10 is disposed on the surface of the heat exchanger to collect the surface temperature of the heat exchanger;

[0065] The controller 20 is connected to the temperature sensor and is used to obtain the minimum surface temperature based on the surface temperature. When the minimum surface temperature is greater than or equal to a preset temperature threshold, the controller controls the fan speed to gradually cool the climate wind tunnel. When the minimum surface temperature is less than the preset temperature threshold, the controller controls the fan speed to reduce the wind tunnel temperature to the target experimental temperature.

[0066] It is feasible to install a temperature sensor matrix on the surface of the heat exchanger and use the temperature sensor matrix to collect the surface temperature of the heat exchanger. Based on the surface temperature of the heat exchanger collected by the temperature sensor matrix, the minimum surface temperature of the heat exchanger can be determined.

[0067] In this embodiment of the invention, the lowest surface temperature of the heat exchanger is taken as the characteristic surface temperature of the heat exchanger, which can effectively prevent ice formation at any point on the surface of the heat exchanger.

[0068] To prevent the formation of a thick frost layer on the surface of the heat exchanger fins after the saturated humid air cools down during snowfall tests due to high initial relative humidity in the wind tunnel, and to prevent ice buildup on the heat exchanger, this invention employs a step-by-step cooling process and constant-temperature forced-air dehumidification when the lowest surface temperature of the heat exchanger is greater than or equal to a preset temperature threshold. This ensures that the heat exchanger dehumidifies the saturated humid air inside the wind tunnel before frost forms.

[0069] Since the absolute humidity inside the wind tunnel has been reduced to a very small value when the minimum surface temperature of the heat exchanger is greater than or equal to the preset temperature threshold, when the minimum surface temperature of the heat exchanger is less than the preset temperature threshold, lowering the wind tunnel temperature of the climate wind tunnel to the target experimental temperature will basically not cause ice formation on the heat exchanger, thus solving the problem of frost formation and blockage on the surface of the heat exchanger fins in the climate wind tunnel.

[0070] In one embodiment of the present invention, the controller 20 is configured to control the fan to run at a first preset speed for pre-cooling the heat exchanger with a gentle breeze; whenever the minimum surface temperature decreases by a preset temperature, control the fan to run at a second preset speed for a preset time for constant temperature and strong air drainage of the heat exchanger, and return to the step of controlling the fan to run at the first preset speed, wherein the second preset speed is greater than the first preset speed.

[0071] To dehumidify the saturated humid air inside the wind tunnel, this embodiment of the invention performs step-by-step cooling with gentle breeze pre-cooling and constant-temperature strong-wind dehumidification on the heat exchanger.

[0072] Specifically, the fan is controlled to operate at a first preset speed. The heat exchanger exchanges heat with the saturated humid air at this wind tunnel speed, and a light pre-cooling effect is applied to the heat exchanger fins, allowing a water film to form. To prevent frost formation on the heat exchanger fins, the minimum surface temperature of the heat exchanger is monitored to determine if it has decreased below a preset temperature. If the preset temperature has not decreased, it indicates that frost will not form on the heat exchanger fins under these conditions, and the fan can continue operating at the first preset speed. If the preset temperature has decreased, to prevent frost formation, the fan is controlled to operate at a second preset speed for a preset time to provide constant-temperature, strong-air dehumidification of the heat exchanger surface. This cycle is repeated to dehumidify the saturated humid air inside the wind tunnel.

[0073] In one embodiment of the present invention, the climate wind tunnel anti-frost control system 100 further includes:

[0074] The wind speed sensor 30 is connected to the controller and is located at the wind tunnel nozzle of the climate wind tunnel to collect the wind speed of the climate wind tunnel.

[0075] Timer 40, connected to the controller, is set at the wind tunnel nozzle of the climate wind tunnel to calculate the duration for which the wind tunnel wind speed at the wind tunnel nozzle is greater than or equal to the preset wind tunnel wind speed.

[0076] The second preset speed is the fan speed that makes the wind tunnel wind speed at the wind tunnel nozzle greater than the preset wind tunnel wind speed. The preset wind tunnel wind speed is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area.

[0077] The preset time is determined by the wind tunnel wind speed and the total flow length of the climate wind tunnel.

[0078] It is feasible to install wind speed sensors and timers at the wind tunnel nozzles. These sensor signals are input in real time to the wind tunnel power system control system and the wind tunnel cryogenic control system to control the precooling, dewatering, and subcooling stages according to the control logic.

[0079] In this embodiment of the invention, the preset wind tunnel velocity is the wind tunnel velocity required to achieve hydrophobicity on the heat exchanger surface. The preset wind tunnel velocity is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area. The preset time is determined by the wind tunnel velocity and the total flow path length of the climate wind tunnel, ensuring that the heat exchanger surface does not cool down when the fan operates at a second preset speed for a preset time.

[0080] Specifically, the wind tunnel wind speed V (m / s) for each drainage process is determined by the following formula:

[0081]

[0082] Where d is the heat exchanger fin spacing (m), A n Let A be the area of ​​the wind tunnel nozzle. exFor heat exchanger area, This is to preset the wind tunnel wind speed.

[0083] Specifically, the preset time t(s) is determined by the following formula:

[0084]

[0085] Where V is the wind tunnel wind speed (m / s) and L is the total length of the wind tunnel (m).

[0086] As can be seen from the formula for the preset time t, when the fan operates at the second preset speed for the preset time, the humid air in the climate wind tunnel does not circulate around the entire climate wind tunnel, thus achieving constant temperature, strong wind, and water drainage in the heat exchanger.

[0087] In one embodiment of the present invention, the controller 20 is used to control the fan to run at a third preset speed for low-temperature precooling.

[0088] Specifically, the fan is controlled to run at a third preset speed, and the heat exchanger is further cooled to reduce the wind tunnel temperature to a lower experimental temperature.

[0089] The climate wind tunnel anti-frost control system of this invention, when the lowest surface temperature of the heat exchanger is greater than or equal to a preset temperature threshold, performs step-by-step cooling and constant-temperature strong airflow dehumidification on the heat exchanger, thus completing the dehumidification of the wind tunnel interior before frost forms. When the lowest surface temperature of the heat exchanger is less than the preset temperature threshold, the wind tunnel temperature is reduced to the target experimental temperature. The method of this invention prevents icing on the heat exchanger, solving the problems of frost formation and blockage on the surface of the climate wind tunnel heat exchanger fins.

[0090] This invention provides a controller.

[0091] In this embodiment, the controller may include a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the climate wind tunnel anti-frost control method as described above.

[0092] Figure 5 This is a structural block diagram of the controller according to an embodiment of the present invention.

[0093] like Figure 5 As shown, the controller 500 includes a processor 501 and a memory 503. The processor 501 and the memory 503 are connected, for example, via a bus 502. Optionally, the controller 500 may also include a transceiver 504. It should be noted that in practical applications, the transceiver 504 is not limited to one, and the structure of the controller 500 does not constitute a limitation on the embodiments of the present invention.

[0094] Processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. Processor 501 may also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0095] Bus 502 may include a pathway for transmitting information between the aforementioned components. Bus 502 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 502 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0096] The memory 503 stores a computer program corresponding to the climate wind tunnel anti-frost control method of the above embodiments of the present invention. This computer program is controlled and executed by the processor 501. The processor 501 executes the computer program stored in the memory 503 to implement the content shown in the foregoing method embodiments.

[0097] The controller 500 includes, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), and in-vehicle terminals (such as in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 5 The controller 500 shown is merely an example and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.

[0098] The controller in this embodiment of the invention utilizes the above-mentioned climate wind tunnel anti-frost control method, which prevents ice buildup on the heat exchanger and solves the problems of frost formation and blockage on the surface of the climate wind tunnel heat exchanger fins.

[0099] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0100] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0101] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0102] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0103] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0104] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0105] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0106] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preventing frost formation in a climate wind tunnel, characterized in that, The climate wind tunnel includes a heat exchanger and a fan, and the method includes: Detect the lowest surface temperature of the heat exchanger; When the lowest surface temperature is greater than or equal to a preset temperature threshold, the fan is controlled to gradually cool the heat exchanger. When the minimum surface temperature is less than the preset temperature threshold, the fan is controlled to reduce the wind tunnel temperature of the climate wind tunnel to the target experimental temperature. The step of controlling the fan to cool the heat exchanger in stages includes: controlling the fan to run at a first preset speed to perform micro-air pre-cooling of the heat exchanger; whenever the minimum surface temperature decreases by a preset temperature, controlling the fan to run at a second preset speed for a preset time to perform constant temperature strong air drainage of the heat exchanger, and returning to the step of controlling the fan to run at the first preset speed, wherein the second preset speed is greater than the first preset speed.

2. The climate wind tunnel anti-frost control method according to claim 1, characterized in that, The second preset rotational speed is the fan speed at which the wind tunnel wind speed at the wind tunnel nozzle is greater than the preset wind tunnel wind speed. The preset wind tunnel wind speed is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area.

3. The climate wind tunnel anti-frost control method according to claim 2, characterized in that, The preset time is determined by the wind tunnel wind speed and the total flow path length of the climate wind tunnel.

4. The climate wind tunnel anti-frost control method according to claim 1, characterized in that, The control of the fan to reduce the wind tunnel temperature of the climate wind tunnel to the target experimental temperature includes: The fan is controlled to run at a third preset speed for low-temperature precooling.

5. The method for preventing frost formation in a climate wind tunnel according to claim 1, characterized in that, The first preset rotational speed is the fan speed at which the wind speed at the wind tunnel nozzle is less than 2.5 m / h.

6. A climate wind tunnel anti-frost control system, characterized in that, The climate wind tunnel includes a heat exchanger and a fan, and the system includes: A temperature sensor array is disposed on the surface of the heat exchanger for collecting the surface temperature of the heat exchanger; The controller, connected to the temperature sensor, is used to obtain the minimum surface temperature based on the surface temperature, and when the minimum surface temperature is greater than or equal to a preset temperature threshold, control the speed of the fan to gradually cool the climate wind tunnel, and when the minimum surface temperature is less than the preset temperature threshold, control the speed of the fan to reduce the wind tunnel temperature to the target experimental temperature. The controller is configured to: control the fan to run at a first preset speed for pre-cooling the heat exchanger with a gentle breeze; whenever the minimum surface temperature decreases by a preset temperature, control the fan to run at a second preset speed for a preset time for constant temperature and strong airflow to drain the heat exchanger, and return to the step of controlling the fan to run at the first preset speed, wherein the second preset speed is greater than the first preset speed.

7. The climate wind tunnel anti-frost control system according to claim 6, characterized in that, The system also includes: A wind speed sensor, connected to the controller, is located at the wind tunnel nozzle of the climate wind tunnel and is used to collect the wind speed of the climate wind tunnel. A timer, connected to the controller, is located at the wind tunnel nozzle of the climate wind tunnel and is used to calculate the duration for which the wind tunnel wind speed at the wind tunnel nozzle is greater than or equal to a preset wind tunnel wind speed. The second preset rotational speed is the fan speed at which the wind tunnel velocity at the wind tunnel nozzle is greater than the preset wind tunnel velocity. The preset wind tunnel velocity is determined by the fin spacing of the heat exchanger and the ratio of the wind tunnel nozzle area to the heat exchanger area. The preset time is determined by the wind tunnel wind speed and the total flow path length of the climate wind tunnel.

8. A controller, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the computer program is executed by the processor, it implements the climate wind tunnel anti-frost control method as described in any one of claims 1-5.

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