Distributed semi-atomization cooling system

Abstract

The invention provides a distributed type semi-atomization cooling system. The system comprises a temperature and humidity detection module, a water pump control module, a water pump and a semi-atomization module. Wherein the detection module can detect the temperature and humidity of a condenser of an air conditioner outdoor unit; the water pump control module can compare the temperature and humidity obtained by the detection module with the water pump triggering temperature and humidity to judge whether the water pump is started or not; the water pump can convey water to the semi-atomization module after being started; the semi-atomization module comprises a plurality of spray heads, the spray heads can spray a plurality of small water drops, and the size of the small water drops is larger than or equal to 0.1 mm. According to the water drop requirement of semi-atomization spraying and the spraying coverage range, a proper spray head arrangement mode is designed, and a more effective spraying cooling effect is obtained; the temperature and humidity of each air conditioner outdoor unit can be checked through an APP anytime and anywhere by utilizing the Internet of Things technology, and the triggering temperature and humidity are modified; the temperature and humidity of at least 100 air conditioner outdoor units can be detected and adjusted at the same time, and the requirements of different machine rooms can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning cooling, and in particular to a distributed semi-atomizing cooling system. Background Art

[0003] Since communication equipment is the main heat source in the computer room, in order to ensure that the environment of the computer room meets the requirements, the air conditioner in the computer room is required to run continuously for a long time. However, the outdoor units of the air conditioners are placed too densely, the ambient temperature rises year by year, and the heat dissipation environment temperature is high. Some air conditioners with large loads have large working currents when working in high temperature environments, and often trip at high voltage, causing the air conditioner to shut down. Therefore, the telecommunications industry will install pure water semi-atomization energy-saving devices on the outdoor units of air conditioners to reduce the temperature of the air on the air inlet side of the condenser, increase the heat dissipation efficiency on the cooling side, and improve the economic performance of the air conditioner.

[0004] Considering the relationship between the spray distance and droplet size of semi-atomized water in actual use, it is necessary to select appropriate nozzle shape, size and layout method to achieve the best cooling effect; at the same time, the current mainstream air-conditioning outdoor unit spray cooling device directly controls parameters on site and starts the adjustment device to achieve the purpose of cooling the air outdoor unit condenser. Both control and maintenance are time-consuming and labor-intensive, and the current application scenarios of Internet of Things technology are relatively common; therefore, this system proposes a distributed spray cooling solution based on LORA to achieve better energy saving and emission reduction effects. Summary of the invention

[0005] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a distributed semi-atomization cooling system.

[0007] The system includes: a temperature and humidity detection module, a water pump control module, a water pump and a semi-atomization module; wherein the detection module can obtain the temperature and humidity of the condenser of the air conditioner outdoor unit; the water pump control module can compare the temperature and humidity detected by the detection module with the water pump triggering temperature and humidity to determine whether to turn on the water pump; after the water pump is turned on, it can transport water to the semi-atomization module; the semi-atomization module includes a plurality of nozzles, which can spray out multiple small water droplets, and the size of the small water droplets is ≥0.1mm.

[0008] Optionally, the system further comprises a power supply and a main control module, wherein the main control module can transmit the modified water pump triggering temperature and humidity to the water pump control module by means of LORA wireless transmission;

[0009] Optionally, the server can acquire and store the temperature and humidity data detected by the detection module.

[0010] The system also includes a user end, which can obtain temperature and humidity data from the server; the user end can also modify the water pump triggering temperature and humidity and transmit them to the server, and the server can transmit the modified water pump triggering temperature and humidity to the main control module.

[0011] Optionally, the nozzle of the nozzle is a special-shaped structure; the cross-section of the special-shaped structure is a rectangular structure, including two parallel long sides and two symmetrical arc-shaped short sides, the distance between the two long sides is 1.2mm~1.8mm, the long side size is 2.5mm~3.6mm, and the arc-shaped short side corresponds to the center angle of the circle of 45~60 degrees.

[0012] Optionally, the nozzle has a first cavity, a second cavity, a third cavity and a fourth cavity which are connected in sequence along the direction of liquid flow; wherein the radial dimensions of the first cavity and the second cavity are constant, and the radial dimension of the first cavity is smaller than the radial dimension of the second cavity; the radial dimension of the third cavity gradually decreases, and the maximum radial dimension of the third cavity is smaller than the radial dimension of the second cavity; the fourth cavity is the cavity of the nozzle.

[0013] Optionally, the first cavity and the second cavity are cylindrical.

[0014] Optionally, the shape of the end where the third cavity is connected to the fourth cavity is the same as the rectangular structure.

[0015] Optionally, the size of the water droplets sprayed by the nozzle is determined by the following formula:

[0016]

[0017] Among them, the parameters in the formula are dimensionless parameters and are taken in corresponding units; d is the diameter of the water droplet, corresponding to the unit mm; X is the circumference of the water flow section of the nozzle, corresponding to the unit mm; S is the water flow section area of ​​the nozzle, corresponding to the unit mm 2 ; p is the pressure of the water pump, corresponding to the unit of MPa; x is the distance between the water droplet and the nozzle, corresponding to the unit of m.

[0018] Optionally, the semi-atomization module includes a plurality of nozzles, the nozzle elevation angle is 15° to 20°, and the vertical distance between the nozzle and the air conditioner outdoor unit is 12 to 18 cm.

[0019] Optionally, the water pump pressure is 0.3-0.4 MPa, such as 0.31, 0.35, or 0.39 MPa.

[0020] Optionally, the minimum spray distance and the maximum spray distance of the nozzle are determined according to the following formula:

[0021]

[0022] Among them, Zmax and Z min Respectively represent the maximum and minimum distances between the nozzle and the air conditioner outdoor unit for longitudinal spraying; θ y is the value corresponding to the nozzle elevation angle, dimensionless; L A It is the vertical distance between the nozzle and the air conditioner outdoor unit, the value is 12-18, the unit is cm.

[0023] Optionally, the diameter of the water droplets falling on the heat sink is 0.18 mm to 0.22 mm.

[0024] Optionally, when the difference between the maximum and minimum spraying distances is greater than the size of the heat sink, the nozzles are arranged unilaterally.

[0025] Optionally, when the difference between the maximum and minimum longitudinal spraying distances is smaller than the size of the heat sink, the nozzles are arranged in opposite directions.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0027] (1) The present invention utilizes Internet of Things technology (GSMGPRS) to view the temperature and humidity of each air conditioner outdoor unit through an APP anytime and anywhere, and modify the trigger temperature and humidity.

[0028] (2) The present invention can simultaneously detect and adjust the temperature and humidity of at least 100 air-conditioning outdoor units, and can meet the requirements of different computer rooms.

[0029] (3) The present invention designs a suitable nozzle layout method based on the water droplet requirements and spray coverage range of the semi-atomized spray to obtain a more effective spray cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0031] Figure 1 A schematic diagram showing the connection relationship of each module of the present invention.

[0032] Figure 2 The figure shows the connection diagram between the LORA module and the STM32 microcontroller.

[0033] Figure 3 The figure shows the connection diagram between the GSMGPRS module and the STM32 microcontroller.

[0034] Figure 4 The figure shows the connection diagram between the DHT module and the STM32 microcontroller.

[0035] Figure 5 The figure shows the connection diagram between STM32 microcontroller and relay module.

[0036] Fig. 6A A schematic longitudinal section of the nozzle is shown.

[0037] Figure 6B A schematic diagram of a transverse cross section of the nozzle is shown.

[0038] Figure 7 A comparison chart of the endothermic evaporation rates of water droplets with radii of 0.5 mm, 1 mm and 2 mm under non-isothermal conditions is shown.

[0039] Figure 8 A schematic diagram of the spray range of a single nozzle is shown.

[0040] Fig. 9 A schematic diagram of the spraying effect of an inclined nozzle is shown.

[0041] Fig.10 A schematic diagram showing the single-sided arrangement of the nozzles is shown.

[0042] Fig.11 A schematic diagram showing the opposing arrangement of nozzles is shown.

[0043] Description of main reference numerals:

[0044] A-nozzle, B-heat sink area, C-air conditioner outdoor unit, D-ground. DETAILED DESCRIPTION

[0045] Hereinafter, the distributed semi-atomization cooling system of the present invention will be described in detail in conjunction with exemplary embodiments.

[0046] Exemplary Embodiment 1

[0047] The distributed semi-atomized cooling system of the present invention is a distributed spray cooling system based on LORA. The specific technical scheme includes: firstly, the temperature and humidity information of the air conditioner outdoor unit is obtained through the temperature and humidity sensor, and the water pump control module compares the obtained temperature and humidity according to the set trigger temperature and humidity. If the current temperature and humidity are higher than the set trigger temperature and humidity, the single-chip microcomputer turns on the relay to energize the low-pressure water pump, and the distributed nozzle system performs spray cooling; at the same time, the water pump control module sends the current temperature and humidity data to the main control module through the LORA module in real time, and the main control module sends the current temperature and humidity data to the server through the GSMGPRS module. The server can be accessed through the APP to view the temperature and humidity of each air conditioner outdoor unit, and the trigger temperature and humidity can also be modified through the APP. The present invention can cool down one or more air conditioner outdoor units. For example, it can simultaneously detect and adjust the temperature and humidity of several, dozens, tens, or hundreds of air conditioner outdoor units to meet the requirements of different computer rooms.

[0048] The following is a further description with reference to the accompanying drawings.

[0049] The distributed semi-atomization cooling system comprises: a temperature and humidity detection module, a water pump control module, a water pump and a semi-atomization module.

[0050] The detection module can detect the temperature and humidity of the air conditioner outdoor unit condenser;

[0051] The water pump control module can compare the temperature and humidity detected by the detection module with the water pump triggering temperature and humidity to determine whether to turn on the water pump; after the water pump is turned on, it can deliver water to the semi-atomization module;

[0052] The semi-atomization module includes several nozzles, which can spray out multiple small water droplets, and the size of the small water droplets is ≥0.1mm.

[0053] In this embodiment, the system further includes: Figure 1 The main control microcontroller (i.e. main control module), LORA module and GSMGPRS module are shown.

[0054] The main control microcontroller may include an STM32 microcontroller. The main control module can send the temperature and humidity detected by the detection module to the server, and / or transmit the modified water pump triggering temperature and humidity to the water pump control module through the LORA module.

[0055] Figure 2 The connection diagram of the LORA module and the STM32 microcontroller pins is shown. The LORA module can also be called the LORA wireless serial port module. The module is 115200baud, no parity check, the packet length is 240bytes, the power is dBm, there are up to 65535 addresses and 255 frequency channels; the output and input interfaces can accept 5V input. The STM32 microcontroller is the host in the serial port protocol, and the LORA wireless serial port module is regarded as a slave; the RX1 of the host is connected to the TX1 of the slave, TX1 is connected to RX1, and the high and low levels of IO1 and IO2 control the working mode of the LORA wireless serial port module. The wireless communication between the master control and the water pump control module can be realized through the LORA module.

[0056] Figure 3 The schematic diagram of the connection between the GSMGPRS module and the STM32 single-chip microcomputer is shown. The GSMGPRS module can be ATK-SIM800C. The GSMGPRS module, i.e., the Internet of Things module, is an important part of the entire design. It is necessary to consider the requirements such as power consumption and processing speed in the selection. Therefore, the present invention selects the GSMGPRS module, which has the characteristics of low power consumption and low cost, and is suitable for communication between the server and the power supply and the main control module single-chip microcomputer. The USART serial communication mode is adopted between the STM32 single-chip microcomputer and the GSMGPRS module, and data transmission is performed through AT instructions.

[0057] In this embodiment, the temperature and humidity detection module may include a DHT module, specifically a DHT11 temperature and humidity sensor. Figure 4 The schematic diagram of the connection between the STM32 single-chip microcomputer and the DHT module is shown. Since the temperature and humidity detection near the condenser of the air conditioner outdoor unit needs to consider factors such as response speed and noise sensitivity, the present invention uses the DHT11 temperature and humidity sensor. The DHT11 temperature and humidity sensor consists of a resistive humidity sensing element and an NTC temperature measuring element, and adopts a digital output of a single bus protocol. The temperature measurement range is between -10°C and 60°C, and the humidity measurement range is within 20%-95%. The DHT module can be used to measure the temperature and humidity of the condenser of the air conditioner outdoor unit, and it can be used to determine whether it is necessary to turn on the low-pressure water pump for spraying and cooling.

[0058] In this embodiment, the water pump control module may include a relay module. Figure 5 The connection diagram of STM32 single chip microcomputer and relay module is shown. The module is mainly used to control the switch of low pressure water pump spraying. For example, the single chip microcomputer can turn on the relay module to power on the water pump to start spraying and cooling. The present invention can use YL-78 as the relay module, but due to power supply reasons, it is necessary to provide a separate 5V power supply for the relay. The connection method is as follows Figure 5 shown.

[0059] Each water pump can supply water to a sprinkler, and the water pump control module can control the opening and closing of one or more water pumps.

[0060] In this embodiment, the system may further include a power supply. As an option of the present invention, the power supply may include an AC-DC adapter and a DC-DC converter, such as Figure 1 220V AC to 12V DC adapter, 12V to 3.3V and 5.5V DC-DC converter shown.

[0061] In this embodiment, as an option of the present invention, the APP obtains the current temperature and humidity of the air conditioner outdoor unit from the server, and can also modify the settings of the trigger temperature and humidity of the spray cooling. The server transmits the setting data of the trigger temperature and humidity to the main control module. After receiving the data, the main control module transmits the data to the water pump control module via LORA transmission. After the water pump control module updates the setting data, the trigger temperature and humidity of the water pump are compared with the current temperature and humidity of the air conditioner outdoor unit condenser to determine whether to turn on the low-pressure water pump for spray cooling. At the same time, the temperature and humidity information of the air conditioner outdoor unit condenser is transmitted to the main control module via LORA.

[0062] In this embodiment, Fig. 6A A longitudinal cross-sectional schematic diagram of the nozzle is shown. Figure 6B A right side view of the nozzle is shown, with dimensions in mm.

[0063] The nozzle comprises a first cavity, a second cavity, a third cavity and a fourth cavity which are sequentially connected along the liquid flow direction (ie from left to right).

[0064] The first cavity is cylindrical, and the diameter may be 2.50-2.80 mm, for example, 2.64 mm.

[0065] The second cavity is also cylindrical, and the diameter may be 5.60-6.20 mm, such as 5.94 mm, and the axial dimension may be 3.95-4.30 mm, such as 4.16 mm.

[0066] The radial dimension of the third cavity is gradually reduced, and the maximum radial dimension can be 2.80 to 3.15 mm, for example, 2.97 mm. The shape of the end where the third cavity is connected to the fourth cavity is the same as the quasi-rectangular structure. The shape of the radial cross section of the third cavity is similar to the structure of the radial cross section of the nozzle, wherein the radial cross section of the left end of the third cavity (i.e., the end connected to the second cavity) is similar to the radial cross section of the nozzle, but there is no difference between the long and short sides. From left to right, the radial cross section of the third cavity is finally consistent with the radial cross section of the fourth cavity during the change process.

[0067] The fourth cavity is the cavity of the nozzle, such as Figure 6B As shown, the special-shaped structure is a quasi-rectangular structure, including two long sides and two arc-shaped short sides. The size of the long side can be 2.5 to 3.6 mm, for example, 3 mm, the distance between the two long sides can be 1.2 to 1.8 mm, for example, 1.5 mm, and the angle corresponding to the radian (π / 4 to π / 3 radians) of the two arc-shaped short sides can be 45 to 60 degrees, for example, 45 degrees (π / 4 radians). The axial size of the nozzle cavity can be 0.85 to 1.30 mm, for example, 1.00 mm.

[0068] In this embodiment, the nozzle sprays a plurality of small water droplets, the size of the small water droplets is ≥ 0.1 mm, and the size of the small water droplets is determined by the following formula:

[0069]

[0070] It should be noted that all parameters in the above formula are dimensionless, but each parameter must be taken in corresponding units. For example, p is the value of pressure, but this value must be taken in MPa.

[0071] Where d is the diameter of the water droplet, and the corresponding unit is mm. For example, if d=0.2 is calculated, the diameter of the water droplet is 0.2 mm;

[0072] X is the circumference of the water-passing section of the nozzle, the corresponding unit is mm; S is the water-passing section area of ​​the nozzle, the corresponding unit is mm 2; p is the pressure, the corresponding unit is MPa, that is, the pressure of the water pump, which can be checked on the water pump manual or instrument label; x is the linear distance of the water droplet from the nozzle, the corresponding unit is m. In the above formula, the present invention takes into account the influence of the nozzle shape on the water droplet diameter.

[0073] Compared with ordinary circular nozzles, the heterogeneous nozzles of the present invention have flat and uniform jets, and have better jet density. The most obvious advantage is that the lateral spray range is 1.3-1.8 times larger than that of ordinary circular nozzles of the same area, which can reduce the layout density of the nozzles, save costs, and reduce energy consumption and water consumption of atomized spraying.

[0074] In this embodiment, Figure 7 The endothermic evaporation rate of water droplets with different radii on a copper sheet with a radius of 10 mm and a thickness of 1 mm is obtained by simulation under the same conditions of the total volume of water droplets. The temperature difference between the water droplet and the copper sheet is 15°C. In the simulation calculation, the gas-liquid two-phase flow follows the mass conservation equation, momentum conservation equation and energy conservation equation:

[0075]

[0076] In the above formula, ρ is the density of the corresponding material, represents the flow velocity, p is the pressure, μ is the viscosity coefficient, is the momentum source term, C p represents isobaric heat capacity, Q is the energy source term, and Q includes the latent heat of vaporization of water, i.e., the evaporation endothermic term. In the formula, k is the thermal conductivity. In addition, the mass conservation equation needs to consider the two-phase problem, that is, there is a gas phase and a liquid phase conservation equation, and the mass source term caused by phase change should be added to the right side of the equation.

[0077] In terms of mesh and heat transfer, this model considers: two-phase laminar flow (moving mesh to track water-air interface, fluid-fluid interface including evaporation mass flow); heat transfer in solids and fluids (non-isothermal flow, temperature-dependent saturated vapor density at water droplet interface, latent heat of evaporation, substrate heating effect)

[0078] Figure 7 The faster the evaporation rate, the higher the heat absorption and cooling efficiency. Figure 7 It can be seen that when the total volume is the same, the evaporation and heat absorption rate of multiple small water droplets is much higher than that of a single large water droplet; therefore, under the same total water volume, the cooling efficiency of the spray system for the air conditioner radiator basically depends on the size of a single water droplet. The larger the water droplet size, the higher the cooling efficiency. However, there are other problems in actual situations. For example, the movement of water droplets that are too small in size in the air will be affected by the Brownian effect, which will cause the water droplets to fail to reach the radiator surface. The size of the Brownian motion particles is less than or equal to 10 -2mm, therefore, the size of the water droplets cannot be less than 0.1 mm.

[0079] In this embodiment, the semi-atomization module includes several nozzles. The nozzle elevation angle is 15° to 20°, the vertical distance between the nozzle and the air conditioner outdoor unit is 12 to 18 cm, and the water pump pressure is 0.3 to 0.4 MPa. Under this condition, the minimum spray distance and maximum spray distance of the nozzle can be determined according to the following formula:

[0080]

[0081] Among them, Z max and Z min Respectively represent the maximum and minimum distances between the nozzle and the air conditioner outdoor unit for longitudinal spraying; θ y is the value corresponding to the nozzle elevation angle, dimensionless, ranging from 15 to 20. For example, if the elevation angle is 18°, then θ y Take 18; L A It is the vertical distance between the nozzle and the air conditioner outdoor unit, the value is 12-18, the unit is cm.

[0082] Figure 8 The figure is a schematic diagram of the spray range of a single nozzle, where the water pump pressure is 0.35MPa, the nozzle is the above-mentioned special-shaped structure, the vertical distance between the nozzle and the air conditioner outdoor unit is 12-18cm, and when the nozzle elevation angle changes from 15° to 20°, the maximum spray distance in the longitudinal direction (parallel to the heat sink) changes from about 70cm to 100cm, and the spray range in the transverse direction (perpendicular to the heat sink) is about 45-60cm. Figure 8 As shown in the figure, the nozzle has a range when spraying. It cannot spray at places that are too far away, and it cannot spray at places that are too close. The 20-30cm in the figure is the area that cannot be sprayed at a distance that is too close. For example, if the vertical distance between the nozzle and the air conditioner outdoor unit is 15cm and the nozzle elevation angle is 15°, the actual spray range can be calculated from the above formula to be 30cm to 98cm.

[0083] Fig. 9 The figure is a schematic diagram of the spraying effect, where A represents the nozzle, B represents the heat sink area, C represents the air conditioner outdoor unit, and D represents the ground. In this embodiment, the nozzle is installed 15 cm below the air conditioner outdoor unit, and the oblique shadow part represents the location of the heat sink. Taking the nozzle elevation angle of 15° as an example, according to the calculation results of formula (1) and formula (3), the diameter of the water droplets at 30 cm (i.e., the minimum longitudinal spray distance) is about 0.18 mm, and the diameter of the water droplets at 98 cm (i.e., the maximum longitudinal spray distance) is 0.22 mm. Both are semi-atomized spray droplets in the millimeter to sub-millimeter range and are not affected by the Brownian effect. In the spraying, the two long sides of the nozzle are parallel to the horizontal plane.

[0084] In actual use, if the nozzle elevation angle is too small, a large number of water droplets will not be able to reach the heat sink due to gravity. If the elevation angle is too large, the spray distance will be insufficient and the heat sink at the far end cannot be fully sprayed and cooled. The sizes of large precision air conditioner outdoor units vary greatly. For some rectangular outdoor units, the nozzle layout can be unilateral, such as Fig.10 As shown in the figure, under the premise of selecting a 50cm horizontal spacing between the nozzles, the unilateral layout method can basically cover the entire heat sink area, and the water droplet diameter meets the semi-atomized spray requirements. The circular diameter of the heat sink area in the figure is 70cm, the width of the air conditioner outdoor unit is 180cm, and the height is 100cm. Therefore, when the semi-atomized spray conditions are met, when the difference between the maximum and minimum longitudinal spray distances is greater than the heat sink size, the Fig.10 Single-sided arrangement shown.

[0085] Some large precision air conditioner outdoor units are square in shape or larger in size, exceeding 110 cm. In this case, two nozzles need to be arranged in opposite directions in the longitudinal direction. The spray cooling effect can be improved by arranging the two nozzles in opposite directions in the longitudinal direction. The horizontal spacing between the nozzles is also set to about 50 cm. Fig.11 For example, if the size of the air conditioner outdoor unit is 190cm and the heat sink area is a circle with a diameter of 150cm, the opposite layout method can cover the entire heat sink area, and the water droplet diameter meets the semi-atomized spray requirements. Therefore, when the semi-atomized spray conditions are met, when the difference between the maximum and minimum longitudinal spray distances is less than the heat sink size, the opposite layout method can be used. Fig.11 The opposite arrangement (double-sided arrangement) is shown.

[0086] Although the present invention has been described above in conjunction with the exemplary embodiments and the accompanying drawings, it should be apparent to those skilled in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims

1. A distributed semi-atomization cooling system, characterized in that: The system includes: a temperature and humidity detection module, a water pump control module, a water pump and a semi-atomization module; wherein, The detection module can detect the temperature and humidity of the air conditioner outdoor unit condenser; The water pump control module can compare the temperature and humidity obtained by the detection module with the water pump trigger temperature and humidity to determine whether to turn on the water pump; After the water pump is turned on, it can deliver water to the semi-atomizing module; The semi-atomization module includes several nozzles, which can spray out multiple small water droplets, and the size of the small water droplets is ≥0.1mm.

2. The distributed semi-atomization cooling system according to claim 1 is characterized in that: The system also includes a power supply and a main control module, wherein the main control module can transmit the modified water pump triggering temperature and humidity to the water pump control module via LORA wireless transmission.

3. The distributed semi-atomization cooling system according to claim 2 is characterized in that: The server can obtain and store the temperature and humidity data detected by the detection module; The system also includes a user end, which can obtain temperature and humidity data from the server; the user end can also modify the water pump triggering temperature and humidity and transmit them to the server, and the server can transmit the modified water pump triggering temperature and humidity to the main control module.

4. The distributed semi-atomization cooling system according to claim 1 is characterized in that: The nozzle of the nozzle is a special-shaped structure; the cross-section of the special-shaped structure is a rectangular structure, including two parallel long sides and two symmetrical arc-shaped short sides, the distance between the two long sides is 1.2mm~1.8mm, the long side size is 2.5mm~3.6mm, and the corresponding angle of the arc-shaped short side is 45~60 degrees.

5. The distributed semi-atomization cooling system according to claim 4 is characterized in that: The nozzle has a first cavity, a second cavity, a third cavity and a fourth cavity which are sequentially connected along the liquid flow direction; wherein, The radial dimensions of the first cavity and the second cavity are constant, and the radial dimension of the first cavity is smaller than the radial dimension of the second cavity; The radial dimension of the third cavity gradually decreases, and the maximum radial dimension of the third cavity is smaller than the radial dimension of the second cavity; The fourth cavity is the cavity of the nozzle.

6. The distributed semi-atomization cooling system according to claim 2 is characterized in that: The first cavity and the second cavity are cylindrical, and the shape of one end where the third cavity is connected to the fourth cavity is the same as the rectangular structure.

7. The distributed semi-atomization cooling system according to claim 1 is characterized in that: The size of the water droplets sprayed by the nozzle is determined by the following formula: Among them, the parameters in the formula are dimensionless parameters and are taken in corresponding units; d is the diameter of the water droplet, corresponding to the unit mm; X is the circumference of the water flow section of the nozzle, corresponding to the unit mm; S is the water flow section area of ​​the nozzle, corresponding to the unit mm 2 ; p is the pressure of the water pump, corresponding to the unit of MPa; x is the distance between the water droplet and the nozzle, corresponding to the unit of m.

8. The distributed semi-atomization cooling system according to claim 1 is characterized in that: The semi-atomization module includes several nozzles, the nozzle elevation angle is 15° to 20°, the vertical distance between the nozzle and the air conditioner outdoor unit is 12 to 18 cm; the water pump pressure is 0.3 to 0.4 MPa; The diameter of the water droplets falling on the heat sink is 0.18 mm to 0.22 mm.

9. The distributed semi-atomization cooling system according to claim 8, characterized in that: The minimum spray distance and the maximum spray distance of the nozzle are determined according to the following formula: Among them, Z max and Z min Respectively represent the maximum and minimum distances between the nozzle and the air conditioner outdoor unit for longitudinal spraying; θ y is the value corresponding to the nozzle elevation angle, dimensionless; L A It is the vertical distance between the nozzle and the air conditioner outdoor unit, with a value of 12 to 18 in cm.

10. The distributed semi-atomization cooling system according to claim 8, characterized in that: When the difference between the maximum and minimum spray distances is greater than the size of the heat sink, the nozzles are arranged unilaterally; When the difference between the maximum and minimum longitudinal spraying distances is smaller than the size of the heat sink, the nozzles are arranged in opposite directions.

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