Climate wind tunnel two-stage heat exchange system, its control method, device and storage medium

Abstract

This invention discloses a two-stage heat exchange system for a climate wind tunnel, along with its control method, apparatus, and storage medium. The system includes a first heat exchanger, a second heat exchanger, a refrigerant reservoir, and a refrigerant branch distribution valve located between the first heat exchanger and the refrigerant reservoir. The method includes: acquiring the inlet air temperature and relative humidity of the first heat exchanger; acquiring an opening adjustment signal for the refrigerant branch distribution valve based on the inlet air temperature and relative humidity; and controlling the refrigerant branch distribution valve according to the opening adjustment signal to prevent frost formation on the second heat exchanger. Thus, before the climate wind tunnel return air enters the second heat exchanger, the first heat exchanger performs primary cooling to reduce the air humidity saturation, and the second heat exchanger performs secondary cooling, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel heat exchange system technology, and in particular to a control method for a climate wind tunnel two-stage heat exchange system, a computer-readable storage medium, a control device for a climate wind tunnel two-stage heat exchange system, and a climate wind tunnel two-stage heat exchange system. 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. It typically uses a recirculation wind tunnel mode to continuously cool the circulating air through a main heat exchanger to simulate the low temperature, freezing rain, snowfall, and icing conditions inside the tunnel.

[0003] However, the problem with this technology is that the main heat exchanger is usually located before the stable contraction section and after the power section fan. If the initial relative humidity of the wind tunnel is very high, or if the air reaching the main heat exchanger during snowfall testing is saturated humid air, then after being cooled by the heat exchanger fins, a thick frost layer will form on the fin surface, causing the heat exchanger to become clogged, which reduces the stability and reliability of the climate wind tunnel device. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for a two-stage heat exchange system for a climate wind tunnel. This method enables the return air from the climate wind tunnel to undergo primary cooling via a first heat exchanger before entering the second heat exchanger, reducing the air humidity saturation. The return air is then further cooled via the second heat exchanger, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0005] A second objective of this invention is to provide a computer-readable storage medium.

[0006] The third objective of this invention is to provide a control device for a two-stage heat exchange system for a climate wind tunnel.

[0007] The fourth objective of this invention is to propose a two-stage heat exchange system for a climate wind tunnel.

[0008] To achieve the above objectives, a first aspect of the present invention provides a control method for a two-stage heat exchange system in a climate wind tunnel. The system includes a first heat exchanger, a second heat exchanger, a refrigerant storage tank, and a refrigerant branch distribution valve. The refrigerant branch distribution valve is located between the first heat exchanger and the refrigerant storage tank. The method includes: acquiring the inlet temperature and relative humidity of the first heat exchanger; acquiring an opening adjustment signal for the refrigerant branch distribution valve based on the inlet temperature and relative humidity of the first heat exchanger; and controlling the refrigerant branch distribution valve according to the opening adjustment signal to prevent frost formation on the second heat exchanger.

[0009] According to the control method of the two-stage heat exchange system of the climate wind tunnel according to an embodiment of the present invention, the inlet air temperature and relative humidity of the first heat exchanger are obtained, and the opening adjustment signal of the refrigerant branch distribution valve is obtained based on the inlet air temperature and relative humidity of the first heat exchanger. The refrigerant branch distribution valve is then controlled according to the opening adjustment signal to prevent frost formation on the second heat exchanger. Thus, before the climate wind tunnel return air enters the second heat exchanger, the first heat exchanger performs primary cooling on the climate wind tunnel return air to reduce the air humidity saturation, and the second heat exchanger performs secondary cooling on the climate wind tunnel return air, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0010] In addition, the control method for the climate wind tunnel two-stage heat exchange system according to the above embodiments of the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, obtaining the opening adjustment signal of the refrigerant branch distribution valve includes: if the inlet temperature of the first heat exchanger is greater than the preset temperature threshold, and the relative humidity of the inlet air of the first heat exchanger is greater than or equal to the preset humidity threshold, then obtaining the first dew point temperature based on the inlet temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger; obtaining the outlet temperature of the first heat exchanger, and obtaining the difference between the outlet temperature of the first heat exchanger and the first dew point temperature; determining the valve opening percentage corresponding to the opening adjustment signal based on the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and feeding back the difference between the outlet temperature of the first heat exchanger and the first dew point temperature to the remote wind tunnel temperature and humidity host computer.

[0012] In some embodiments of the present invention, the valve opening percentage corresponding to the opening adjustment signal is determined by the following formula: OP = 0.3 (dt < 0); where OP is the valve opening percentage corresponding to the opening adjustment signal, dt is the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and C is the first dew point temperature.

[0013] In some embodiments of the present invention, obtaining the opening adjustment signal of the refrigerant branch distribution valve further includes: if the inlet temperature of the first heat exchanger is greater than the preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is less than the preset humidity threshold, then determining that the valve opening percentage corresponding to the opening adjustment signal is 0.

[0014] In some embodiments of the present invention, the method further includes: obtaining a second dew point temperature based on the first heat exchanger inlet temperature and the first heat exchanger inlet relative humidity; obtaining the second heat exchanger inlet temperature and obtaining the difference between the second heat exchanger inlet temperature and the second dew point temperature; feeding back the difference between the second heat exchanger inlet temperature and the second dew point temperature to a remote wind tunnel temperature and humidity control computer, so that the remote wind tunnel temperature and humidity control computer controls the refrigerant branch distribution valve based on the difference between the second heat exchanger inlet temperature and the second dew point temperature.

[0015] In some embodiments of the present invention, the method further includes: obtaining the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger; feeding back the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger to the remote wind tunnel temperature and humidity host computer, so that the remote wind tunnel temperature and humidity host computer controls the refrigerant branch distribution valve according to the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger.

[0016] In some embodiments of the present invention, the method further includes: if the inlet temperature of the first heat exchanger is less than or equal to the preset temperature threshold, then determining that the valve opening percentage corresponding to the opening adjustment signal is 0.

[0017] To achieve the above objectives, a computer-readable storage medium is provided in the second aspect of the present invention, on which a control program for a two-stage heat exchange system of a climate wind tunnel is stored. When the control program of the two-stage heat exchange system of the climate wind tunnel is executed by a processor, the control method of the two-stage heat exchange system of the climate wind tunnel described in the embodiments of the present invention is implemented.

[0018] According to an embodiment of the present invention, a computer-readable storage medium, by executing a control program of a climate wind tunnel two-stage heat exchange system stored thereon, can perform primary cooling of the climate wind tunnel return air through a first heat exchanger before the climate wind tunnel return air enters the second heat exchanger, thereby reducing the air humidity saturation, and then perform secondary cooling of the climate wind tunnel return air through the second heat exchanger, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0019] To achieve the above objectives, a third aspect of the present invention provides a control device for a two-stage heat exchange system in a climate wind tunnel. The system includes a first heat exchanger, a second heat exchanger, a refrigerant storage tank, and a refrigerant branch distribution valve. The refrigerant branch distribution valve is disposed between the first heat exchanger and the refrigerant storage tank. The device includes: a first acquisition module for acquiring the inlet temperature and relative humidity of the first heat exchanger; a second acquisition module for acquiring an opening adjustment signal of the refrigerant branch distribution valve based on the inlet temperature and relative humidity of the first heat exchanger; and a control module for controlling the refrigerant branch distribution valve according to the opening adjustment signal to prevent frost formation on the second heat exchanger.

[0020] According to an embodiment of the present invention, the control device of the climate wind tunnel two-stage heat exchange system acquires the inlet temperature and relative humidity of the first heat exchanger through a first acquisition module, and acquires the opening adjustment signal of the refrigerant branch distribution valve based on the inlet temperature and relative humidity of the first heat exchanger through a second acquisition module. Furthermore, the control module controls the refrigerant branch distribution valve according to the opening adjustment signal to prevent frost formation on the second heat exchanger. Thus, before the climate wind tunnel return air enters the second heat exchanger, the first heat exchanger performs primary cooling on the climate wind tunnel return air to reduce its humidity saturation, and the second heat exchanger performs secondary cooling on the climate wind tunnel return air, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0021] To achieve the above objectives, the fourth aspect of the present invention provides a climate wind tunnel two-stage heat exchange system, which includes the control device of the climate wind tunnel two-stage heat exchange system described in the above embodiment of the present invention.

[0022] According to an embodiment of the present invention, the climate wind tunnel two-stage heat exchange system, by employing the aforementioned control device for the climate wind tunnel two-stage heat exchange system, can perform primary cooling of the climate wind tunnel return air through the first heat exchanger before the climate wind tunnel return air enters the second heat exchanger, thereby reducing the air humidity saturation, and then perform secondary cooling of the climate wind tunnel return air through the second heat exchanger, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0023] 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

[0024] Figure 1 This is a schematic diagram of the structure of a two-stage heat exchange system for a climate wind tunnel according to an embodiment of the present invention;

[0025] Figure 2This is a schematic flowchart of a control method for a two-stage heat exchange system in a climate wind tunnel according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic flowchart of a control method for a climate wind tunnel two-stage heat exchange system according to an embodiment of the present invention;

[0027] Figure 4 This is a flowchart illustrating a control method for a two-stage heat exchange system in a climate wind tunnel according to another embodiment of the present invention.

[0028] Figure 5 This is a flowchart illustrating the control method of a two-stage heat exchange system for a climate wind tunnel according to yet another embodiment of the present invention.

[0029] Figure 6 This is a block diagram of the control device for a climate wind tunnel two-stage heat exchange system according to an embodiment of the present invention.

[0030] Figure 7 This is a block diagram of a two-stage heat exchange system for a climate wind tunnel according to an embodiment of the present invention. Detailed Implementation

[0031] 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.

[0032] The following description, with reference to the accompanying drawings, describes a control method for a two-stage heat exchange system in a climate wind tunnel, a computer-readable storage medium, a control device for a two-stage heat exchange system in a climate wind tunnel, and the climate wind tunnel two-stage heat exchange system itself, according to embodiments of the present invention.

[0033] First, the system architecture of the climate wind tunnel two-stage heat exchange system according to embodiments of the present invention will be described accordingly. Specifically, in some embodiments of the present invention, such as... Figure 1 As shown, the climate wind tunnel two-stage heat exchange system includes: a first heat exchanger (located after the power section fan and before the third corner guide vane), a second heat exchanger (located after the third corner guide vane and before the stable contraction section), a refrigerant storage tank, and a refrigerant branch distribution valve (used to regulate the refrigerant flow to the first heat exchanger and the refrigerant flow to the second heat exchanger).

[0034] It should be noted that in the above embodiments of the present invention, the first heat exchanger is a finned tube heat exchanger with a large gap between the fins (20mm to 50mm), so that the droplets generated after the first heat exchanger cools the saturated humid air cannot condense on the fin surface. The second heat exchanger is a finned tube heat exchanger with a small gap between the fins (5mm to 20mm). The refrigerant source of the second heat exchanger is a refrigerant storage tank. The first heat exchanger uses a refrigerant branch as the circulating working fluid, and a refrigerant branch distribution valve is provided between the first heat exchanger and the refrigerant storage tank.

[0035] Figure 2 This is a schematic flowchart of the control method for a two-stage heat exchange system in a climate wind tunnel according to an embodiment of the present invention.

[0036] Specifically, in some embodiments of the present invention, such as Figure 2 As shown, the control method for the two-stage heat exchange system of the climate wind tunnel includes:

[0037] S101, obtain the inlet temperature and relative humidity of the first heat exchanger.

[0038] It is understood that, in this embodiment of the present invention, a temperature and humidity sensor array (at least 16 measuring points are evenly arranged on the entire heat exchanger surface) can be set at the air inlet and outlet (within 500mm) of the first heat exchanger to obtain the air inlet temperature and relative humidity of the first heat exchanger, and the air inlet temperature and relative humidity of the first heat exchanger can be fed back to the host computer controller of the anti-frost system.

[0039] S102, based on the inlet air temperature and relative humidity of the first heat exchanger, obtain the opening adjustment signal of the refrigerant branch distribution valve.

[0040] It is understood that, in this embodiment of the present invention, after the host computer controller of the anti-frost system receives the inlet air temperature and relative humidity of the first heat exchanger, it can obtain the corresponding opening adjustment signal of the refrigerant branch distribution valve for different climate wind tunnel return air humidity, thereby controlling the refrigerant branch distribution valve in real time.

[0041] S103 controls the refrigerant branch distribution valve according to the opening adjustment signal to prevent frost formation on the second heat exchanger.

[0042] It is understood that, in this embodiment of the present invention, the heat exchange capacity of the first heat exchanger and the second heat exchanger can be adjusted in real time by controlling the refrigerant branch distribution valve through the host computer controller of the anti-frost system, thereby ensuring that the humidity of the climate wind tunnel return air entering the second heat exchanger is less than or equal to 100%RH, thus preventing the second heat exchanger from frosting.

[0043] Furthermore, in some embodiments of the present invention, such as Figure 3 As shown, acquiring the opening adjustment signal of the refrigerant branch distribution valve includes:

[0044] S201, if the inlet temperature of the first heat exchanger is greater than the preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is greater than or equal to the preset humidity threshold, then the first dew point temperature is obtained based on the inlet temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger.

[0045] It is understood that in this embodiment of the present invention, when the inlet air temperature of the first heat exchanger is greater than a preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is greater than or equal to a preset humidity threshold, it can be considered that the humidity of the return air of the climate wind tunnel is too high, and the second heat exchanger is at risk of condensation and / or frosting. At this time, it is necessary to obtain the first dew point temperature under the current temperature and humidity conditions based on the inlet air temperature and the relative humidity of the inlet air of the first heat exchanger, so as to use the first dew point temperature to pre-cool and dehumidify the return air of the climate wind tunnel.

[0046] Optionally, in the above embodiments of the present invention, the preset temperature threshold and the preset humidity threshold can be set according to the actual climate simulation scenario. For example, the preset temperature threshold can preferably be 95°C and the preset humidity threshold can preferably be 5%.

[0047] S202, obtain the outlet temperature of the first heat exchanger, and obtain the difference between the outlet temperature of the first heat exchanger and the first dew point temperature.

[0048] It is understood that, in this embodiment of the present invention, the outlet temperature of the first heat exchanger can be obtained by the aforementioned temperature and humidity sensor array. In addition, if the difference between the outlet temperature of the first heat exchanger and the first dew point temperature is greater than 0, it is considered that the second heat exchanger has a high risk of condensation and / or frosting. Conversely, if the difference between the outlet temperature of the first heat exchanger and the first dew point temperature is less than or equal to 0, it is considered that the second heat exchanger has a low risk of condensation and / or frosting.

[0049] S203 determines the valve opening percentage corresponding to the opening adjustment signal based on the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and feeds back the difference between the outlet temperature of the first heat exchanger and the first dew point temperature to the remote wind tunnel temperature and humidity host computer.

[0050] It is understood that in this embodiment of the invention, the host computer controller of the anti-frost system determines the valve opening percentage corresponding to the opening adjustment signal based on the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, so as to control the refrigerant branch distribution valve to open to the corresponding opening degree, so that the climate wind tunnel two-stage heat exchange system enters the circulating dehumidification state. In the circulating dehumidification state, the first heat exchanger can pre-cool and dehumidify the climate wind tunnel return air (that is, reduce the temperature of the climate wind tunnel return air to below the first dew point temperature), and then generate condensate or frost on the fin surface of the first heat exchanger to reduce the absolute humidity (moisture content) of the climate wind tunnel return air. Furthermore, due to the change in the valve opening degree of the refrigerant branch distribution valve, the surface temperature of the fins of the second heat exchanger is similar to that of the first heat exchanger. Therefore, after the pre-cooled and dehumidified climate wind tunnel return air enters the second heat exchanger, condensation and / or frost will not form on the fin surface of the second heat exchanger.

[0051] Furthermore, in this embodiment of the invention, the host computer controller of the anti-frost system can also feed back the difference between the outlet temperature of the first heat exchanger and the first dew point temperature to the remote wind tunnel temperature and humidity host computer, so that the experimenters can realize real-time monitoring and adjustment of the climate wind tunnel two-stage heat exchange system.

[0052] Furthermore, in some embodiments of the present invention, the valve opening percentage corresponding to the opening adjustment signal is determined by the following formula:

[0053]

[0054] OP = 0.3 (dt ≤ 0);

[0055] Where OP is the valve opening percentage corresponding to the opening adjustment signal, dt is the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and C is the first dew point temperature.

[0056] It is understood that, in the embodiments of the present invention, when the difference between the outlet temperature of the first heat exchanger and the first dew point temperature is greater than 0, the valve opening percentage corresponding to the opening adjustment signal can increase as the difference between the outlet temperature of the first heat exchanger and the first dew point temperature increases, so as to adaptively adjust the pre-cooling and dehumidification capacity of the first heat exchanger for the climate wind tunnel return air, thereby ensuring that the temperature of the climate wind tunnel return air entering the second heat exchanger is lower than the first dew point temperature, preventing the second heat exchanger from frosting. Furthermore, when the difference between the outlet temperature of the first heat exchanger and the first dew point temperature is less than or equal to 0, the valve opening percentage corresponding to the opening adjustment signal can be determined to be 0.3, thereby reducing the energy consumption of the first heat exchanger while ensuring that the temperature of the climate wind tunnel return air entering the second heat exchanger is lower than the first dew point temperature, preventing the second heat exchanger from frosting.

[0057] Furthermore, in some embodiments of the present invention, obtaining the opening adjustment signal of the refrigerant branch distribution valve further includes: if the inlet temperature of the first heat exchanger is greater than a preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is less than a preset humidity threshold, then determining that the valve opening percentage corresponding to the opening adjustment signal is 0.

[0058] It is understood that in this embodiment of the present invention, when the inlet air temperature of the first heat exchanger is greater than the preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is less than the preset humidity threshold, it can be considered that the humidity of the return air of the climate wind tunnel is in an unsaturated state, and the second heat exchanger has no risk of condensation and / or frosting. At this time, the valve opening percentage corresponding to the opening adjustment signal can be determined to be 0, so that the climate wind tunnel two-stage heat exchange system enters the unsaturated humid air cooling state. In the unsaturated humid air cooling state, the first heat exchanger does not work, and the return air of the climate wind tunnel directly enters the second heat exchanger for cooling. At the same time, the fin surface temperature of the second heat exchanger can be controlled so that the outlet temperature of the second heat exchanger is higher than the first dew point temperature, ensuring that condensation does not form on the fin surface of the second heat exchanger.

[0059] Furthermore, in some embodiments of the present invention, such as Figure 4 As shown, the control method for the two-stage heat exchange system of the climate wind tunnel also includes:

[0060] S301, the second dew point temperature is obtained based on the inlet air temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger.

[0061] It is understood that in this embodiment of the present invention, when the inlet temperature of the first heat exchanger is greater than the preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is less than the preset humidity threshold, the second dew point temperature under the current temperature and humidity state is obtained according to the inlet temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger, so as to use the second dew point temperature to determine whether the climate wind tunnel return air needs to be pre-cooled and dehumidified.

[0062] S302, obtain the inlet temperature of the second heat exchanger, and obtain the difference between the inlet temperature of the second heat exchanger and the second dew point temperature.

[0063] It is understood that, in this embodiment of the present invention, if the difference between the inlet temperature of the second heat exchanger and the second dew point temperature is greater than 0, the second heat exchanger is considered to have a risk of condensation and / or frosting; and if the difference between the inlet temperature of the second heat exchanger and the second dew point temperature is less than or equal to 0, the second heat exchanger is considered to have no risk of condensation and / or frosting.

[0064] S303 feeds back the difference between the inlet temperature of the second heat exchanger and the second dew point temperature to the remote wind tunnel temperature and humidity host computer, so that the remote wind tunnel temperature and humidity host computer can control the refrigerant branch distribution valve according to the difference between the inlet temperature of the second heat exchanger and the second dew point temperature.

[0065] It is understood that, in this embodiment of the present invention, the host computer controller of the anti-frost system can feed back the difference between the inlet temperature of the second heat exchanger and the second dew point temperature to the remote wind tunnel temperature and humidity host computer, providing data reference for the experimenters to adjust the refrigerant branch distribution valve in real time.

[0066] Furthermore, in some embodiments of the present invention, such as Figure 5 As shown, the control method for the two-stage heat exchange system of the climate wind tunnel also includes:

[0067] S401, obtain the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger.

[0068] Understandably, the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger can be used to characterize the degree of pre-cooling and dehumidification of the climate wind tunnel return air by the first heat exchanger.

[0069] S402 feeds back the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger to the remote wind tunnel temperature and humidity host computer, so that the remote wind tunnel temperature and humidity host computer controls the refrigerant branch distribution valve according to the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger.

[0070] It is understood that, in this embodiment of the present invention, the host computer controller of the anti-frost system can feed back the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger to the remote wind tunnel temperature and humidity host computer, providing data reference for the experimenters to adjust the refrigerant branch distribution valve in real time.

[0071] Furthermore, in some embodiments of the present invention, the control method of the climate wind tunnel two-stage heat exchange system further includes: if the inlet temperature of the first heat exchanger is less than or equal to a preset temperature threshold, then determining that the valve opening percentage corresponding to the opening adjustment signal is 0.

[0072] It is understood that in this embodiment of the present invention, when the inlet air temperature of the first heat exchanger is less than or equal to the preset temperature threshold, the return air of the climate wind tunnel is considered to be in a low temperature state, and the second heat exchanger has no risk of condensation and / or frosting. At this time, the valve opening percentage corresponding to the opening adjustment signal can be determined to be 0, so that the climate wind tunnel two-stage heat exchange system enters the dry air cooling state. In the dry air cooling state, the first heat exchanger does not work, and the return air of the climate wind tunnel directly enters the second heat exchanger for cooling until the return air of the climate wind tunnel is reduced to the experimental target temperature.

[0073] In summary, the control method of the two-stage heat exchange system for the climate wind tunnel according to an embodiment of the present invention acquires the inlet air temperature and relative humidity of the first heat exchanger, and acquires the opening adjustment signal of the refrigerant branch distribution valve based on the inlet air temperature and relative humidity of the first heat exchanger. Furthermore, the refrigerant branch distribution valve is controlled according to the opening adjustment signal to prevent frost formation on the second heat exchanger. Thus, before the climate wind tunnel return air enters the second heat exchanger, the first heat exchanger performs primary cooling on the climate wind tunnel return air, reducing the air humidity saturation, and the second heat exchanger performs secondary cooling on the climate wind tunnel return air, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0074] Based on the control method of the climate wind tunnel two-stage heat exchange system in the above embodiments of the present invention, the present invention also proposes a computer-readable storage medium storing a control program of the climate wind tunnel two-stage heat exchange system thereon. When the control program of the climate wind tunnel two-stage heat exchange system is executed by a processor, it implements the control method of the climate wind tunnel two-stage heat exchange system in the above embodiments of the present invention.

[0075] It should be understood that the specific implementation of the computer-readable storage medium in the embodiments of the present invention can be found in the specific implementation of the control method of the climate wind tunnel two-stage heat exchange system in the foregoing embodiments of the present invention. To reduce redundancy, it will not be described again here.

[0076] In summary, according to the computer-readable storage medium of the present invention, by executing the control program of the climate wind tunnel two-stage heat exchange system stored thereon, the climate wind tunnel return air can be initially cooled by the first heat exchanger before entering the second heat exchanger, thereby reducing the air humidity saturation, and then the climate wind tunnel return air can be cooled a second time by the second heat exchanger, thereby preventing the second heat exchanger from frosting and improving the system stability and reliability.

[0077] Figure 6 This is a block diagram of the control device for a climate wind tunnel two-stage heat exchange system according to an embodiment of the present invention.

[0078] Specifically, in some embodiments of the present invention, such as Figure 6 As shown, the control device 1000 of the climate wind tunnel two-stage heat exchange system includes: a first acquisition module 10, a second acquisition module 20, and a control module 30.

[0079] The first acquisition module 10 is used to acquire the inlet air temperature and relative humidity of the first heat exchanger; the second acquisition module 20 is used to acquire the opening adjustment signal of the refrigerant branch distribution valve based on the inlet air temperature and relative humidity of the first heat exchanger; and the control module 30 is used to control the refrigerant branch distribution valve according to the opening adjustment signal to prevent the second heat exchanger from frosting.

[0080] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is further configured to: if the inlet temperature of the first heat exchanger is greater than a preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is greater than or equal to a preset humidity threshold, then acquire the first dew point temperature based on the inlet temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger; acquire the outlet temperature of the first heat exchanger and acquire the difference between the outlet temperature of the first heat exchanger and the first dew point temperature; determine the valve opening percentage corresponding to the opening adjustment signal based on the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and feed back the difference between the outlet temperature of the first heat exchanger and the first dew point temperature to the remote wind tunnel temperature and humidity host computer.

[0081] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is further configured to determine the valve opening percentage corresponding to the opening adjustment signal using the following formula: OP = 0.3 (dt < 0); where OP is the valve opening percentage corresponding to the opening adjustment signal, dt is the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and C is the first dew point temperature.

[0082] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is further configured to determine that the valve opening percentage corresponding to the opening adjustment signal is 0 if the inlet temperature of the first heat exchanger is greater than a preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is less than a preset humidity threshold.

[0083] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is further configured to: acquire a second dew point temperature based on the first heat exchanger inlet temperature and the first heat exchanger inlet relative humidity; acquire the second heat exchanger inlet temperature and acquire the difference between the second heat exchanger inlet temperature and the second dew point temperature; and feed back the difference between the second heat exchanger inlet temperature and the second dew point temperature to the remote wind tunnel temperature and humidity host computer, so that the remote wind tunnel temperature and humidity host computer controls the refrigerant branch distribution valve based on the difference between the second heat exchanger inlet temperature and the second dew point temperature.

[0084] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is further configured to acquire the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger; and to feed back the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger to the remote wind tunnel temperature and humidity host computer, so that the remote wind tunnel temperature and humidity host computer controls the refrigerant branch distribution valve according to the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger.

[0085] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is also used to determine that the valve opening percentage corresponding to the opening adjustment signal is 0 if the inlet temperature of the first heat exchanger is less than or equal to a preset temperature threshold.

[0086] It should be understood that the specific implementation methods of the control device for the climate wind tunnel two-stage heat exchange system in the embodiments of the present invention correspond one-to-one with the specific implementation methods of the control method for the climate wind tunnel two-stage heat exchange system in the embodiments of the present invention. To reduce redundancy, they will not be repeated here.

[0087] In summary, the control device for the climate wind tunnel two-stage heat exchange system according to an embodiment of the present invention acquires the inlet air temperature and relative humidity of the first heat exchanger through a first acquisition module, and acquires the opening adjustment signal of the refrigerant branch distribution valve based on the inlet air temperature and relative humidity of the first heat exchanger through a second acquisition module. Furthermore, the control module controls the refrigerant branch distribution valve based on the opening adjustment signal to prevent frost formation on the second heat exchanger. Thus, before the climate wind tunnel return air enters the second heat exchanger, the first heat exchanger performs primary cooling to reduce the air humidity saturation, and the second heat exchanger performs secondary cooling, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0088] Figure 7 This is a block diagram of a two-stage heat exchange system for a climate wind tunnel according to an embodiment of the present invention.

[0089] Specifically, in some embodiments of the present invention, such as Figure 7 As shown, the climate wind tunnel two-stage heat exchange system 2000 includes the control device 1000 of the climate wind tunnel two-stage heat exchange system described in the above embodiment of the present invention.

[0090] It should be understood that the specific implementation of the climate wind tunnel two-stage heat exchange system in the embodiments of the present invention can be found in the specific implementation of the control method of the climate wind tunnel two-stage heat exchange system in the foregoing embodiments of the present invention. To reduce redundancy, it will not be described again here.

[0091] In summary, the climate wind tunnel two-stage heat exchange system according to the present invention, by employing the aforementioned control device for the climate wind tunnel two-stage heat exchange system, can perform primary cooling of the climate wind tunnel return air through the first heat exchanger before the climate wind tunnel return air enters the second heat exchanger, thereby reducing the air humidity saturation, and then perform secondary cooling of the climate wind tunnel return air through the second heat exchanger, thereby preventing frost formation on the second heat exchanger and improving system stability and reliability.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 control method for a two-stage heat exchange system in a climate wind tunnel, characterized in that, The system includes a first heat exchanger, a second heat exchanger, a refrigerant storage tank, and a refrigerant branch distribution valve. The refrigerant branch distribution valve is located between the first heat exchanger and the refrigerant storage tank. The method includes: Obtain the inlet air temperature and relative humidity of the first heat exchanger; The opening adjustment signal of the refrigerant branch distribution valve is obtained based on the inlet air temperature and relative humidity of the first heat exchanger. The refrigerant branch distribution valve is controlled according to the opening adjustment signal to prevent frost formation on the second heat exchanger; The step of obtaining the opening adjustment signal of the refrigerant branch distribution valve includes: If the inlet temperature of the first heat exchanger is greater than a preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is greater than or equal to a preset humidity threshold, then the first dew point temperature is obtained based on the inlet temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger. Obtain the outlet temperature of the first heat exchanger, and obtain the difference between the outlet temperature of the first heat exchanger and the first dew point temperature; The valve opening percentage corresponding to the opening adjustment signal is determined based on the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and the difference between the outlet temperature of the first heat exchanger and the first dew point temperature is fed back to the remote wind tunnel temperature and humidity host computer.

2. The control method for the two-stage heat exchange system of the climate wind tunnel according to claim 1, characterized in that, The valve opening percentage corresponding to the opening adjustment signal is determined by the following formula: (dt>0); (dt<0); in, This represents the valve opening percentage corresponding to the opening adjustment signal. This is the difference between the outlet temperature of the first heat exchanger and the first dew point temperature. This is the first dew point temperature.

3. The control method for the two-stage heat exchange system of the climate wind tunnel according to claim 1, characterized in that, Acquiring the opening adjustment signal of the refrigerant branch distribution valve further includes: If the inlet air temperature of the first heat exchanger is greater than the preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is less than the preset humidity threshold, then the valve opening percentage corresponding to the opening adjustment signal is determined to be 0.

4. The control method for the two-stage heat exchange system of the climate wind tunnel according to claim 3, characterized in that, The method further includes: The second dew point temperature is obtained based on the inlet air temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger. Obtain the inlet temperature of the second heat exchanger, and obtain the difference between the inlet temperature of the second heat exchanger and the second dew point temperature; The difference between the inlet temperature of the second heat exchanger and the second dew point temperature is fed back to the remote wind tunnel temperature and humidity control computer, so that the remote wind tunnel temperature and humidity control computer controls the refrigerant branch distribution valve according to the difference between the inlet temperature of the second heat exchanger and the second dew point temperature.

5. The control method for the two-stage heat exchange system of the climate wind tunnel according to claim 4, characterized in that, The method further includes: Obtain the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger; The difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger is fed back to the remote wind tunnel temperature and humidity control computer, so that the remote wind tunnel temperature and humidity control computer controls the refrigerant branch distribution valve according to the difference between the inlet temperature of the second heat exchanger and the outlet temperature of the first heat exchanger.

6. The control method for the two-stage heat exchange system of the climate wind tunnel according to claim 3, characterized in that, The method further includes: If the inlet temperature of the first heat exchanger is less than or equal to the preset temperature threshold, then the valve opening percentage corresponding to the opening adjustment signal is determined to be 0.

7. A computer-readable storage medium, characterized in that, It stores a control program for a two-stage heat exchange system of a climate wind tunnel. When the control program of the two-stage heat exchange system of the climate wind tunnel is executed by the processor, it implements the control method of the two-stage heat exchange system of the climate wind tunnel as described in any one of claims 1-6.

8. A control device for a two-stage heat exchange system in a climate wind tunnel, characterized in that, The system includes a first heat exchanger, a second heat exchanger, a refrigerant storage tank, and a refrigerant branch distribution valve. The refrigerant branch distribution valve is located between the first heat exchanger and the refrigerant storage tank. The device includes: The first acquisition module is used to acquire the inlet air temperature and relative humidity of the first heat exchanger. The second acquisition module is used to acquire the opening adjustment signal of the refrigerant branch distribution valve based on the inlet air temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger. The control module is used to control the refrigerant branch distribution valve according to the opening adjustment signal to prevent the second heat exchanger from frosting. The second acquisition module is further configured to: if the inlet temperature of the first heat exchanger is greater than a preset temperature threshold and the relative humidity of the inlet air of the first heat exchanger is greater than or equal to a preset humidity threshold, then acquire a first dew point temperature based on the inlet temperature of the first heat exchanger and the relative humidity of the inlet air of the first heat exchanger; acquire the outlet temperature of the first heat exchanger and acquire the difference between the outlet temperature of the first heat exchanger and the first dew point temperature; determine the valve opening percentage corresponding to the opening adjustment signal based on the difference between the outlet temperature of the first heat exchanger and the first dew point temperature, and feed back the difference between the outlet temperature of the first heat exchanger and the first dew point temperature to the remote wind tunnel temperature and humidity host computer.

9. A two-stage heat exchange system for a climate wind tunnel, characterized in that, The climate wind tunnel two-stage heat exchange system includes the control device for the climate wind tunnel two-stage heat exchange system as described in claim 8.

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