A temperature control method and device for outdoor electric control cabinet based on recycled water cooling

Abstract

This application relates to a temperature control method for outdoor electrical control cabinets based on reclaimed water cooling, belonging to the field of electrical control cabinet temperature control technology. It includes the following steps: acquiring internal cabinet temperature parameters and external ambient temperature parameters; preset internal cabinet temperature thresholds and external ambient temperature thresholds; determining the temperature control mode of the electrical control cabinet based on the comparison results of the internal cabinet temperature parameters and the internal cabinet temperature thresholds, and the comparison results of the external ambient temperature parameters and the external ambient temperature thresholds; controlling the operation of the corresponding temperature control unit according to the determined temperature control mode to control the temperature of the electrical control cabinet; the temperature control mode includes at least one of natural air cooling mode, forced air cooling mode, water cooling mode, and combined air-water cooling mode; the cooling water in the water cooling mode and the combined air-water cooling mode uses reclaimed water from a sewage treatment plant. This application has the effect of prioritizing the use of lower energy consumption temperature control methods while meeting the temperature control requirements of the electrical control cabinet, thereby reducing the system's operating energy consumption.

Description

Technical Field

[0001] This application relates to the field of temperature control technology for electrical control cabinets, and in particular to a method and device for temperature control of outdoor electrical control cabinets based on reclaimed water cooling. Background Technology

[0002] Wastewater treatment plants possess a wealth of usable reclaimed water resources. Compared to ambient temperatures, reclaimed water typically exhibits a temperature characteristic of being warm in winter and cool in summer, serving as a relatively stable natural cold or heat source. On the other hand, wastewater treatment plants house numerous electrical control cabinets, which typically operate continuously year-round and are mostly installed outdoors. Influenced by solar radiation and the continuous heating of electrical components within the cabinets, the internal temperature can easily rise significantly, reaching high levels in severe cases. If heat accumulates over a long period, causing the internal temperature to exceed the rated temperature range of the components, it can lead to decreased insulation performance, shortened component lifespan, and even malfunctions such as burnout or tripping, thereby affecting the stability and safety of the wastewater treatment system. Therefore, achieving economical, efficient, and reliable temperature control for outdoor electrical control cabinets in wastewater treatment plants is of significant practical importance.

[0003] In existing technologies, common heat dissipation methods for electrical control cabinets mainly include: natural heat dissipation, forced air cooling by fans, heat sink cooling, water cooling, and heat pipe cooling. While all of these methods can improve the heat dissipation conditions of electrical control cabinets to some extent, they all have certain limitations. Natural heat dissipation mainly relies on natural air convection, resulting in limited heat dissipation capacity, and is generally only suitable for applications with low heat loads. Forced air cooling, although relatively simple in structure, experiences a significant decrease in heat dissipation efficiency under high outdoor temperatures, and long-term continuous operation can lead to high fan loads. Furthermore, dust in the air can easily enter the cabinet and clog the air inlet or filter components. Heat sink cooling mainly relies on increasing the heat dissipation area, but its overall heat dissipation capacity is limited by materials, shape, and installation conditions, resulting in limited improvement. Water cooling, while having strong heat dissipation capacity, usually requires a dedicated circulating water system, which has a complex structure, poses a risk of leakage, and has high equipment and maintenance costs. Heat pipe cooling, while possessing good heat transfer performance, requires a large initial investment, and its installation is constrained by space constraints.

[0004] To address the heat dissipation problem of electrical control cabinets in wastewater treatment plants, some improvement solutions have been proposed in existing technologies. For example, Patent 1 (Application No.: CN202210712965.8, A Cooling Device for Electrical Control Cabinets in Wastewater Treatment Plants and Its Usage Method) proposes using wastewater as a cold source, removing heat from the cabinet through circulating water cooling pipes, and further combining a compressor refrigeration circuit and a fan to enhance heat dissipation, thereby achieving multi-stage cooling. Although this solution improves heat dissipation capacity, it requires the configuration of multiple components such as circulating pumps, compressors, and condensers, resulting in a complex overall system structure and high energy consumption.

[0005] Patent 2 (CN202410964575.9, A heat dissipation structure for an electrical control cabinet and an electrical control cabinet) proposes to improve the heat dissipation effect by automatically cleaning the dust in the air intake slot and adjusting the spacing of the internal heat dissipation plates. However, it introduces multiple motors and corresponding drive structures, which increases the complexity of the system and the energy consumption.

[0006] Therefore, the existing technologies mainly have the following problems: First, some solutions mainly rely on a single heat dissipation method, which makes it difficult to meet the temperature control requirements under different ambient temperatures and different heat load conditions inside the cabinet; Second, although existing solutions also use a combination of multiple heat dissipation methods, they generally have the problems of complex system structure, many additional devices, and high energy consumption. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a method and apparatus for temperature control of an outdoor electrical control cabinet based on reclaimed water cooling.

[0008] The outdoor electrical control cabinet temperature control method based on reclaimed water cooling provided in this application adopts the following technical solution: A method for temperature control of an outdoor electrical control cabinet based on reclaimed water cooling includes the following steps: Obtain the internal temperature parameters and the external ambient temperature parameters of the cabinet; Preset cabinet internal temperature threshold and cabinet external ambient temperature threshold; Based on the comparison results of the cabinet internal temperature parameters and the cabinet internal temperature threshold, and the comparison results of the cabinet external ambient temperature parameters and the cabinet external ambient temperature threshold, the temperature control mode of the electrical control cabinet is determined. According to the determined temperature control mode, the corresponding temperature control unit is controlled to operate in order to control the temperature of the electrical control cabinet; The temperature control mode includes at least one of the following: natural air cooling mode, forced air cooling mode, water cooling mode, and combined air and water cooling mode; The cooling water used in the water-cooling mode and the combined air-water cooling mode is recycled water from the sewage treatment plant.

[0009] By adopting the above technical solution, the internal temperature parameters and external ambient temperature parameters of the cabinet are obtained simultaneously. Combined with the preset internal temperature threshold and external ambient temperature threshold, the current operating condition of the electrical control cabinet is judged. Thus, the temperature control mode that matches the current operating condition is selected from natural air cooling mode, forced air cooling mode, water cooling mode and air-water combined cooling mode. This avoids the problem that a single heat dissipation method cannot take into account different ambient temperatures and different heat load conditions, and can improve the pertinence and rationality of the selection of temperature control mode. Meanwhile, the present invention does not always use a high-energy-consuming cooling method, but selects an appropriate temperature control mode according to the temperature state inside and outside the cabinet. Under the premise of meeting the temperature control requirements of the electrical control cabinet, it prioritizes the use of a lower-energy-consuming temperature control method, which helps to reduce the energy consumption of the system operation. This invention utilizes reclaimed water from wastewater treatment plants as cooling water in both water-cooling and combined air-water cooling modes. This fully utilizes existing reclaimed water resources in wastewater treatment plants, reduces dependence on external cooling sources, achieves resource recycling, and exhibits excellent energy efficiency. Optionally, the cabinet temperature threshold includes a first preset value, a second preset value, and a third preset value, wherein the first preset value is less than the second preset value, and the second preset value is less than the third preset value; The external ambient temperature threshold includes a high-temperature preset value; When the internal temperature parameter is less than the first preset temperature and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the natural air cooling mode. When the internal temperature parameter is less than the first preset temperature and the external temperature parameter is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the water cooling mode. When the internal temperature parameter is greater than or equal to the first preset temperature and less than the second preset temperature, and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the forced air cooling mode. When the internal temperature parameter is greater than or equal to the first preset temperature and less than the second preset temperature, and the external temperature parameter is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the water cooling mode. When the internal temperature parameter is greater than or equal to the second preset temperature and less than the third preset temperature, and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the water cooling mode. When the internal temperature parameter of the cabinet is greater than or equal to the second preset temperature and less than the third preset temperature, and the external temperature of the electrical control cabinet is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the combined air-water cooling mode. An alarm is triggered when the temperature parameter inside the cabinet is greater than or equal to the third preset temperature.

[0010] By adopting the above technical solution, when the temperature inside the cabinet is low and the ambient temperature outside the cabinet has not reached the high temperature preset value, the natural air cooling mode can ensure that the temperature of the cabinet meets the working requirements without generating energy consumption due to heat dissipation. When the temperature inside the cabinet rises but has not yet reached a higher temperature range, forced air cooling mode or water cooling mode can be selected according to the ambient temperature outside the cabinet. This avoids using a high-energy-consuming cooling method too early when the ambient temperature is low, and also avoids continuing to use a low-efficiency air cooling method under high ambient temperature conditions, which helps to improve the rationality of temperature control method selection. When the temperature inside the cabinet rises further and the ambient temperature outside the cabinet is high, the combined air-water cooling mode is adopted. This mode can utilize both air cooling and reclaimed water cooling to improve heat dissipation capacity, thereby more effectively coping with the combined conditions of high heat load and high ambient temperature, and ensuring the temperature control effect of the electrical control cabinet. An alarm is triggered when the temperature inside the cabinet reaches or exceeds the third preset value. This can promptly prompt maintenance or manual intervention under abnormal high-temperature conditions, thereby improving the safety of system operation and reducing the risk of damage to components inside the electrical control cabinet caused by continuous accumulation of high temperature.

[0011] Optionally, after the current temperature control mode has been running for a preset time, the internal temperature parameters and external ambient temperature parameters are reacquired. Based on the comparison results of the reacquired internal temperature parameters and the internal temperature threshold, and the comparison results of the reacquired external ambient temperature parameters and the external ambient temperature threshold, the temperature control mode is re-determined.

[0012] By adopting the above technical solution, after the current temperature control mode has been running for a preset time, the internal temperature parameters and external ambient temperature parameters of the cabinet are re-acquired, and the temperature control mode is re-determined based on the re-acquired parameters. This enables the temperature control strategy of the electrical control cabinet to be dynamically adjusted according to the changes in the internal thermal state and external ambient state of the cabinet, avoiding the problem of the temperature control mode being fixed for a long time after it is determined, which leads to a mismatch with the actual working conditions.

[0013] When the temperature inside or outside the cabinet changes, this invention can promptly reassess and switch to a temperature control mode that is more suitable for the current operating conditions, thereby helping to ensure that the electrical control cabinet is always in a more reasonable temperature control state and improving the stability and adaptability of the temperature control effect.

[0014] At the same time, by periodically reassessing the temperature control mode, it is possible to avoid continuing to maintain an unnecessary high-energy-consuming operating mode after changes in environmental conditions, thereby helping to reduce the overall energy consumption of the system.

[0015] Optionally, during the operation of the temperature control unit, the heat load value of the electrical control cabinet is calculated in real time; Determine the current cooling load value based on the heat load value; In the water-cooling mode and the combined air-water cooling mode, the regenerated water flow rate is adjusted in real time according to the cooling load value; In the forced air cooling mode, the fan speed is adjusted in real time according to the cooling load.

[0016] By adopting the above technical solution, when the heat load of the electrical control cabinet increases, the regenerated water flow rate and / or fan speed can be increased in a timely manner to ensure the temperature control effect; when the heat load of the electrical control cabinet decreases, the regenerated water flow rate and / or fan speed can be reduced accordingly, thereby further reducing the operating energy consumption of water pumps and fans while ensuring that the heat dissipation requirements are met.

[0017] Optionally, the real-time and cumulative power consumption of each of the temperature control units can be collected and stored, and combined with the current cooling load value, real-time and cumulative calculations can be performed to obtain the real-time system energy efficiency value and cumulative system energy efficiency value of each of the temperature control units. In the combined air-water cooling mode, the reclaimed water flow rate and fan speed are adjusted according to the real-time system energy efficiency value; The cabinet temperature threshold is optimized and adjusted based on the accumulated system energy efficiency value.

[0018] By adopting the above technical solution, the regenerated water flow rate and fan speed are adjusted according to the real-time system energy efficiency value, so that the synergy between air cooling and water cooling in the combined cooling mode can better meet the current actual heat dissipation needs, thereby avoiding unnecessary energy consumption caused by the simultaneous high-load operation of fans and water pumps. Meanwhile, the cabinet temperature threshold is optimized and adjusted based on the accumulated system energy efficiency value. Based on the actual operating results over a period of time, the cabinet temperature threshold and the external ambient temperature threshold can be subsequently corrected, making the subsequent temperature control mode selection more in line with the actual working conditions and energy-saving needs. This avoids the problem of switching the temperature control mode too early or too late or using the high-energy-consumption mode too much due to unreasonable preset threshold settings, and further reduces energy consumption.

[0019] This application also provides an outdoor electrical control cabinet device based on reclaimed water cooling, which adopts the following technical solution.

[0020] An outdoor electrical control cabinet device based on reclaimed water cooling includes a cabinet, a fan installed inside the cabinet, a heat exchange coil installed on the inner wall of the cabinet, a reclaimed water inlet pipe connected to the water inlet end of the heat exchange coil, a reclaimed water outlet pipe connected to the water outlet end of the heat exchange coil, and a control system installed in the cabinet. The control system is used to preset values, collect parameters and calculate, and judge and control the operating status of the fan and pump body based on the collected information.

[0021] By adopting the above technical solution, this invention, through the installation of a fan, heat exchange coil, and reclaimed water inlet and outlet pipes within the cabinet, and the control system controlling the operation status of the fan and pump, can achieve coordinated temperature control of air cooling and water cooling for the electrical control cabinet, thereby improving the heat dissipation capacity of the electrical control cabinet in outdoor environments. At the same time, using reclaimed water as a cooling medium is beneficial for the effective utilization of reclaimed water resources in wastewater treatment plants and reduces the need for additional cooling sources.

[0022] Optionally, the control system includes a model calculation module, a data acquisition and storage module, a data processing module, a criterion formation module, and an execution module; Both the reclaimed water outlet pipe and the reclaimed water inlet pipe are equipped with valves, flow meters, pressure gauges, and thermometers; An internal temperature sensor is installed inside the cabinet, and an external temperature sensor is installed outside the cabinet. The model calculation module includes a heat exchange equipment thermal calculation model and a system energy efficiency calculation model; The data acquisition and storage module can acquire and store the data required by the thermal calculation model of the heat exchange equipment and the energy efficiency calculation model of the system; The data processing module can perform calculations based on the collected and stored data, according to the thermal calculation model of the heat exchange equipment and the energy efficiency calculation model of the system. The criterion forming module can compare the data obtained by the calculation model module, the data acquisition and storage module, and the data processing module with the cabinet internal temperature threshold and the cabinet external ambient temperature threshold, and at the same time compare and calculate the system energy efficiency under each operating mode to form a criterion for the system to execute the optimized operating mode. The execution module can optimize and switch the system's operating mode based on the criteria obtained by the criteria forming module.

[0023] By adopting the above technical solution, the present invention, through setting up a model calculation module, a data acquisition and storage module, a data processing module, a criterion formation module, and an execution module, can realize parameter acquisition, data processing, criterion formation, and execution control of the operating status of the electrical control cabinet. This enables the system to automatically select and switch the temperature control mode according to the environmental parameters inside and outside the cabinet and the operating parameters, thereby improving the automation level and operational stability of the system control.

[0024] Optionally, the air outlet of the cabinet is located at its top, and both the air outlet and the air inlet of the cabinet are equipped with air filters. Differential pressure sensors are installed on the air inlet side and the windward side of the air filters.

[0025] By adopting the above technical solution, the invention places the air outlet at the top of the cabinet and installs air filters at both the air outlet and the air inlet. This ensures airflow and heat dissipation while reducing dust entering the cabinet. At the same time, the differential pressure sensor can promptly reflect the blockage of the air filter, thus facilitating maintenance and replacement of the filter, ensuring the unobstructed flow of the air-cooling channel and the heat dissipation effect, and improving the reliability of the system operation.

[0026] Optionally, the outer surface of the control cabinet is provided with a radiation cooling coating.

[0027] By adopting the above technical solutions, the radiation cooling coating can reduce the transfer of solar radiation heat to the inside of the cabinet, thereby reducing the adverse effects of the external environment on the temperature rise of the electrical control cabinet; on this basis, it helps to reduce the heat dissipation burden of the air-cooled and water-cooled systems, and further reduce the system's operating energy consumption.

[0028] Optionally, the data collected and stored by the data acquisition and storage module includes the inverter parameters and operating status inside the electrical control cabinet, the allowable operating temperature range of the electrical control cabinet, the internal temperature of the electrical control cabinet, the external ambient temperature of the electrical control cabinet, the fan speed, the flow rate and velocity of reclaimed water, the inlet and outlet temperatures of reclaimed water, the power consumption of the fan, the energy consumption of the equipment for conveying reclaimed water, the structural parameters of the indirect heat exchange equipment, and the operating time of the electrical control cabinet.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention constructs a multi-level progressive energy-saving temperature control mechanism. First, by preset internal cabinet temperature thresholds and external ambient temperature thresholds, and combining these with the internal and external ambient temperature parameters, a temperature control scheme matching the current operating conditions is selected from natural air cooling, forced air cooling, water cooling, and combined air-water cooling modes. This avoids the problem of high energy consumption and poor adaptability of a single heat dissipation method under different operating conditions, prioritizing the selection of the lower energy consumption temperature control mode while ensuring heat dissipation effect. Furthermore, based on the determined temperature control mode, the regenerated water flow rate and fan speed can be adjusted in real time according to the current cooling load value, so that the operating intensity of the water pump and fan matches the current actual heat dissipation demand, avoiding energy waste caused by fixed high flow rate or fixed high speed operation. Further still, the internal cabinet temperature threshold can be optimized and adjusted according to the accumulated system energy efficiency value and / or total power consumption, making subsequent temperature control mode switching more in line with actual operating conditions and energy-saving requirements, thus forming a multi-level energy-saving control system from mode selection, in-mode adjustment to threshold optimization. 2. This invention fully utilizes the abundant reclaimed water resources already present in the wastewater treatment plant, directly using reclaimed water as cooling water. Compared to traditional temperature control methods that rely on additional artificial cooling sources, this reduces the investment and operating costs of additional refrigeration equipment, achieving the recycling of reclaimed water resources and demonstrating good energy-saving and environmental protection effects. Furthermore, the reclaimed water temperature is relatively stable, especially in summer when it is typically lower than the ambient temperature, which is more conducive to improving the cooling effect of the electrical control cabinet. Simultaneously, the residual pressure of the reclaimed water is utilized as much as possible during transportation, reducing or eliminating the need for transportation equipment, resulting in near-zero energy consumption. 3. This invention, by applying a radiative cooling coating to the outer surface of the electrical control cabinet, can weaken the heating effect of solar radiation on the cabinet, reduce the transfer of external heat, thereby reducing the heat dissipation burden on subsequent air-cooling and water-cooling systems, and further reducing the overall energy consumption of the system. Simultaneously, the overall structure of this invention is relatively simple, mainly utilizing reclaimed water, the radiative cooling coating, and the pipeline heat exchange structure to achieve temperature control, eliminating the need for complex traditional refrigeration equipment. This helps reduce system complexity, construction costs, and maintenance costs. Furthermore, it can be used for new equipment development and is easy to modify existing electrical control cabinets, demonstrating good engineering applicability and promotional value. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram illustrating the structure of the heat exchange coil in an embodiment of this application.

[0032] Figure 3 This is a data chart used in the embodiments of this application to illustrate meteorological conditions.

[0033] Figure 4 This is a data graph used in the embodiments of this application to illustrate the cooling load value.

[0034] Figure 5 This is a flowchart illustrating the temperature control method in an embodiment of this application.

[0035] Explanation of reference numerals in the attached diagram: 1. Cabinet; 11. Air outlet; 12. Louver; 13. Fan; 16. Differential pressure sensor; 21. Heat exchange coil; 22. Reclaimed water inlet pipe; 23. Reclaimed water outlet pipe; 24. Valve; 25. Flow meter; 26. Press; 27. Thermometer. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0037] This application discloses an outdoor electrical control cabinet temperature control device based on reclaimed water cooling.

[0038] like Figure 1 and Figure 2 The outdoor electrical control cabinet temperature control device based on reclaimed water cooling includes a cabinet 1. Air outlets 11 are located on both sides of the top of the cabinet 1, and louvers 12 are installed at the air outlets 11. Air inlets for the cabinet 1 are located on both sides of its bottom. With this design, no external power is required. The natural circulation caused by the temperature difference between the inside and outside of the cabinet—hot air rising and cold air sinking—drives natural convection between the air inside and outside the cabinet, thereby carrying away the heat generated by the components inside the cabinet and achieving temperature control.

[0039] A receiving opening is provided at the center of the top inner wall of the cabinet 1, and a fan 13 is installed thereon. The fan 13 can create a negative pressure ventilation environment inside the cabinet 1, and form a directional cooling airflow from bottom to top inside the cabinet, which can efficiently remove the heat generated by the components and improve the temperature control efficiency of the electrical control cabinet.

[0040] Furthermore, air filters are installed at the air outlet 11 of cabinet 1, the receiving port of fan 13, and the air inlet of cabinet 1. Differential pressure sensors 16 are installed on both the air inlet and exhaust sides of the air filters. The differential pressure sensor 16 can be a wind pressure probe or a differential pressure gauge to monitor the pressure difference of air passing through the air filter, and automatically remind the user to replace the air filter based on the magnitude of the pressure difference.

[0041] The inner wall of the cabinet 1 is equipped with a heat exchange coil 21. Specifically, the cabinet 1 adopts a three-sided maintenance structure with a cabinet door. The heat exchange coil 21 is fixed to the three inner side walls of the cabinet 1. Since the cabinet 1 needs to be opened for routine maintenance of the equipment inside, the heat exchange coil 21 is not installed inside the cabinet door. The water inlet of the heat exchange coil 21 is located at the bottom of one side wall of the cabinet 1, and the water outlet of the heat exchange coil 21 is located at the top of the other side wall of the cabinet 1. The water inlet of the heat exchange coil is connected to a reclaimed water inlet pipe 22, and the water outlet of the heat exchange coil is connected to a reclaimed water outlet pipe 23. Both the reclaimed water inlet pipe 22 and the reclaimed water outlet pipe 23 are equipped with valves 24, flow meters 25, pressure gauges, and thermometers 27. In this embodiment, valve 24 is a proportional regulating valve. In this embodiment, in the reclaimed water conveyance system of the wastewater treatment plant, the industrial pipeline has had its pressure parameters optimized through hydraulic calculations during the design phase. The excess pressure (surplus pressure) generated during normal operation is usually sufficient to meet the conveyance requirements of reclaimed water to the heat exchange coil 21. No additional auxiliary equipment such as booster pumps is needed to maintain continuous system operation. Of course, if the reclaimed water excess pressure is insufficient, a pipeline pump can be added; the specific requirement needs to be determined through resistance calculations after design. Considering the corrosiveness of the reclaimed water, the heat exchange coil 21 is made of stainless steel.

[0042] Reclaimed water flows inside the heat exchange coil 21, creating a cold radiant surface on the inner surface to provide radiant cooling to the control cabinet and convective heat exchange with the air inside the cabinet. Utilizing the wastewater treatment plant's abundant reclaimed water resources, this method directly uses reclaimed water as a cooling source. Compared to traditional temperature control methods, it eliminates the need for other artificial cooling sources, resulting in energy savings, environmental friendliness, and significantly reduced costs, while achieving wastewater utilization. Furthermore, the reclaimed water temperature from the wastewater treatment plant is stable, especially in summer when it is much lower than the ambient temperature. Using reclaimed water for cooling the electrical control cabinet provides excellent cooling, keeping the internal temperature within its permissible normal operating range, meeting the temperature control and energy-saving requirements of the control cabinet, extending its service life, and ensuring stable operation of the internal circuitry. Additionally, the residual pressure of the reclaimed water during transportation can be utilized, reducing or eliminating the need for transportation equipment, resulting in near-zero energy consumption.

[0043] A radiative cooling coating is applied to the outer surface and door of cabinet 1 to reduce the transfer of external heat, thereby reducing the heat dissipation burden on subsequent air-cooling and water-cooling systems and further reducing the overall energy consumption of the system. The radiative cooling coating includes a polymer matrix and radiative cooling functional fillers dispersed in the polymer matrix; the polymer matrix can be one or more of acrylic resin, silicone resin, PMMA, and PVDF; the radiative cooling functional fillers can be one or more of barium sulfate, calcium carbonate, silica, alumina, titanium dioxide, yttrium oxide, glass microspheres, or hollow microspheres.

[0044] The above design employs three heat dissipation modes. The first is the fan 13 installed in cabinet 1, which removes heat from the control cabinet by replacing the high-temperature air inside with ambient air, and through natural or forced convection heat exchange between the air and the surface of the heating element. The second is the radiative cooling coating on the outer surface of cabinet 1 and the cabinet door, which prevents outdoor solar radiation energy from entering the control cabinet, thereby reducing the heat gain inside. The third is the heat exchange coil 21 installed on the inner wall of the cabinet, through which a refrigerant (in this invention, a natural refrigerant, i.e., reclaimed water from a wastewater treatment plant, is used; other natural refrigerants can also be used) flows. The refrigerant creates a cold surface, removing heat from the control cabinet through radiative and convective heat exchange. These three heat dissipation modes are integrated into one unit, working together to remove heat from the control cabinet while preventing external heat from entering.

[0045] Taking the control cabinet of an outdoor submersible pump at a sewage treatment plant in Nanjing as an example, the basic data obtained after consulting the relevant materials is as follows; Specific parameters of submersible pump control cabinet 1 power supply Three-phase 380V 2 frequency 50Hz 3 Operating ambient temperature -5℃-40℃ 4 Operating relative humidity 20%-85% 5 Altitude Below 1000m 6 Motor power 20kW 7 thermal conductivity of the shell <![CDATA[5.5W / m 2 •K]]> 8 Power loss of internal components 800W 9 Protection level IP54 10 Length, width and height 900mm x 654mm x 1500mm Combined with local meteorological data, such as Figure 3 As shown, the electrical control cabinet can be calculated as follows: Figure 4 The hourly cooling load required for the cooling is shown. Based on heat load data and electrical control cabinet structural parameters, the dimensions of fan 13, heat exchange coil 21, air inlet, and air outlet 11 are designed using a thermal calculation model of the heat exchange equipment, determining the heat exchange capacity and heat exchange area of ​​the indirect heat exchanger. According to the specific structure and heat exchanger heat exchange area, parameters such as pipe material, inner and outer diameters, and spacing are determined. The structural parameters of the heat exchange equipment are calculated as follows: Specific parameters of submersible pump control cabinet 11 Heat exchanger type serpentine single tube 12 Pipes 304 stainless steel 13 thermal conductivity <![CDATA[16W / m 2 •K]]> 14 Pipe diameter 12mm 15 Pipe spacing 24mm 16 Bending radius 48mm 17 pipe chief 22.2m 18 Effective heat exchange area of ​​the coil 0.84m² 19 Fan type Axial flow fan 20 Fan design air volume 300~500 m³ / h 21 Fan rated power 30～60W 22 Air inlet size 300mm × 120mm 23 Air outlet size 2, 300mm × 300mm 24 Design flow rate of reclaimed water 0.2~0.6 m³ / h 25 Design flow rate of reclaimed water 0.5~1.5 m / s The above design method is a conventional design. For specific thermal calculation models of heat exchange equipment, please refer to the methods disclosed in [Yang Shiming, Tao Wenquan. Heat Transfer [M], Higher Education Press, 2019.] and [Tan Wei, Wang Qiuwang. Heat Exchanger Design Manual [M], Chemical Industry Press, 2021.].

[0046] Considering that there are two main heat sources in the electrical control cabinet during operation: one is the internal heat source (the heat generated by the equipment inside the control cabinet); the other is the external heat source (the heat from the air and solar radiation transmitted from the external environment through the control cabinet's enclosure structure). The internal heat source is related to the type of equipment inside and its operating conditions, while the external heat source is related to the type and materials of the enclosure structure and the external climate, both exhibiting hourly variations. By real-time monitoring of the air temperature inside the control cabinet, the surface temperature of the equipment, the outdoor ambient temperature, and the intensity of outdoor solar radiation, combined with the allowable temperature settings for the inside of the control cabinet and the surface of the equipment, a smart temperature control method can be constructed for the electrical control cabinet's temperature control system. This method aims to achieve efficient and automatic operation of the temperature control system and optimize system energy utilization efficiency.

[0047] Specifically, cabinet 1 is also equipped with a control system, which is used to preset values, collect parameters and calculate, and judge and control the operating status of fan 13 and pump body based on the collected information.

[0048] The control system includes a human-machine interface, a model calculation module, a data acquisition and storage module, a data processing module, a criterion formation module, and an execution module; A cabinet temperature sensor is installed inside the cabinet 1, and an external temperature sensor is installed outside the cabinet 1. The model calculation module includes a thermal calculation model for heat exchange equipment and a system energy efficiency calculation model; The heat exchanger thermal calculation model is based on the composite structure parameters of the heat exchanger (such as packing size, spacing, and material), the temperature and humidity of the outdoor air, and the parameters of the heat exchange medium in the coil (such as the inlet temperature, flow rate, and pressure of the regenerated water). It combines the heat transfer mechanism of the composite structure with the fluid dynamics characteristics to accurately calculate the heat exchanger's heat transfer capacity and heat exchange area. For specific details on the heat exchanger thermal calculation model, please refer to the methods published in [Yang Shiming, Tao Wenquan. Heat Transfer [M], Higher Education Press, 2019.] and [Tan Wei, Wang Qiuwang. Heat Exchanger Design Manual [M], Chemical Industry Press, 2021.]. The system energy efficiency calculation model calculates the system's energy efficiency based on the energy consumption of the system's delivery equipment, such as water pumps, and the achievable system cooling capacity. The system's energy efficiency is also a conventional calculation method in this field; for details, please refer to the method disclosed in [Wu Yezheng, Li Yanzhong. Principles of Refrigeration and Cryogenic Technology [M], Higher Education Press, 2023.].

[0049] For example, heat load QE = internal heat generation Qv - heat dissipation / heat absorption from cabinet surface Qs = Qv - kAΔT; in: Qv: The total heat generation power of the electrical components inside the cabinet, which is obtained based on the operating status of the frequency converter. The specific operating status of the frequency converter includes operating values ​​such as output frequency, voltage, current, output power, and thermal status. These values ​​can be obtained from the corresponding product's manual. For example, the power loss of the internal components in the table above is 800W. Qs: Heat exchanged between the cabinet surface and the environment; k: Cabinet heat transfer coefficient, pre-set according to cabinet material and structure (obtained from a table), such as the shell thermal conductivity of 5.5W / m in the table above. 2 •K; A: Effective heat dissipation area is calculated based on the cabinet's length, width, height, and installation location. The installation location specifically refers to the surface area that is not against a wall and can actually dissipate heat; heat dissipation from the wall-facing side can be ignored. ΔT = Ti-Tu: The difference between the internal temperature Ti and the external ambient temperature Tu, which is obtained by the external temperature sensor and the internal temperature sensor.

[0050] Energy efficiency ratio of a cooling system ηsys = Cooling capacity / Energy consumption For example, when using reclaimed water for cooling, the formula Qc=m w c p,w (Tout - Tin) or Qc = ρ w c p,w q v (Tout-Tin) Where: Qc: Cooling capacity, in W or kW; m w : Reclaimed water mass flow rate q v The volumetric flow rate of reclaimed water is obtained through a flow meter. ρ w Water density C p,w Specific heat of water Tin, Tout: The inlet and outlet temperatures of the reclaimed water, obtained through thermometers in the reclaimed water outlet and inlet pipes; When cooling is performed using fan 13, the sensible heat cooling capacity on the air side is Qc = ρ air c p,air q air ΔT Where: Qc: Cooling capacity, in W or kW; ρ air Air density; c p,air Specific heat capacity of air; qair Gas flow rate; ΔT: The temperature difference between the external environment and the internal temperature of the cabinet; The energy efficiency value can be obtained by dividing the cooling capacity by the power. The power is obtained by directly reading the input power of the water pump and fan motor. The instantaneous energy efficiency value can be obtained through the above calculations, and the cumulative energy efficiency value is obtained through... calculate; The data acquisition and storage module can acquire and store the data required for the thermal calculation model of the heat exchange equipment and the energy efficiency calculation model of the system. The specific data collected and stored includes the temperature range that the electrical control cabinet can operate at, the internal temperature of the electrical control cabinet, the external ambient temperature of the electrical control cabinet, the fan speed, the flow rate and velocity of reclaimed water, the inlet and outlet temperatures of reclaimed water, the power consumption of the fan, the energy consumption of the equipment for conveying reclaimed water, the structural parameters of the indirect heat exchange equipment (reclaimed water heat exchange coil), and the operating time of the electrical control cabinet. The data processing module can perform calculations based on the collected and stored data, according to the thermal calculation model of the heat exchange equipment and the energy efficiency calculation model of the system (for specific calculation rules, please refer to the above-mentioned literature and examples). The criterion formation module can compare the data obtained by the calculation model module, data acquisition and storage module, and data processing module with the cabinet internal temperature threshold and the cabinet external ambient temperature threshold, and at the same time compare and calculate the system energy efficiency under various operating modes to form a criterion for the system to execute the optimized operating mode. Specifically, the criterion formation module pre-stores the cabinet internal temperature threshold and the cabinet external ambient temperature threshold. The cabinet internal temperature threshold may include a first preset value, a second preset value, and a third preset value, while the cabinet external ambient temperature threshold may include a high temperature preset value. The criterion formation module first compares the currently collected cabinet internal temperature parameters and cabinet external ambient temperature parameters with the aforementioned preset thresholds to form a basic mode selection criterion.

[0051] For example: When the internal temperature parameter is less than the first preset value and the external temperature parameter is less than the high temperature preset value, the natural air cooling mode criterion is formed. When the internal temperature parameter is less than the first preset value and the external temperature parameter is greater than or equal to the high temperature preset value, the water cooling mode criterion is formed. When the internal temperature parameter is greater than or equal to the first preset value and less than the second preset value, and the external temperature parameter is less than the high temperature preset value, a forced air cooling mode criterion is formed. When the internal temperature parameter is greater than or equal to the first preset value and less than the second preset value, and the external temperature parameter is greater than or equal to the high temperature preset value, the water cooling mode criterion is formed. When the internal temperature parameter is greater than or equal to the second preset value and less than the third preset value, and the external temperature parameter is less than the high temperature preset value, the water cooling mode criterion is formed. When the internal temperature parameter is greater than or equal to the second preset value and less than the third preset value, and the external temperature parameter is greater than or equal to the high temperature preset value, the criterion for the combined air-water cooling mode is formed. An alarm criterion is formed when the temperature parameter inside the cabinet is greater than or equal to the third preset value.

[0052] Based on this, the criterion formation module can further combine the real-time system energy efficiency value and / or cumulative system energy efficiency value obtained by the data processing module to form an optimized criterion.

[0053] For example, in the combined air-water cooling mode, if the current temperature inside the cabinet is still within the allowable range, the real-time system energy efficiency value under the current fan speed and regenerated water flow rate combination can be further compared to form an optimized control criterion for increasing, decreasing or keeping the fan speed constant, and increasing, decreasing or keeping the regenerated water flow rate constant.

[0054] For example, after the system has been running for a period of time, the criterion formation module can determine whether the existing cabinet temperature threshold is reasonable based on the accumulated system energy efficiency value. If a certain high energy consumption mode has a long-term operating ratio that is too high and the overall system energy efficiency is low, then optimization adjustment criteria can be formed to correct the first preset value, the second preset value, the third preset value and / or the high temperature preset value, so as to further reduce energy consumption in subsequent operation.

[0055] In this way, the criterion formation module can not only determine the temperature control mode to be used based on real-time operating conditions, but also optimize the execution intensity and subsequent threshold settings within the mode while meeting the temperature control requirements.

[0056] The execution module can optimize and switch the system's operating mode based on the criteria obtained by the criteria forming module.

[0057] Specifically, the execution module is electrically connected to the valves on the blower, the reclaimed water inlet pipe and / or the reclaimed water outlet pipe, the reclaimed water conveying equipment (such as water pumps), and the alarm device, and is used to receive the control commands output by the criterion forming module and drive the corresponding execution components to operate.

[0058] For example: When the criterion forming module outputs the natural air cooling mode criterion, the execution module controls the fan to stop running, closes or keeps the regenerated water circuit closed, and allows the cabinet to dissipate heat naturally through the ventilation openings. When the criterion forming module outputs the forced air-cooling mode criterion, the execution module starts the fan and controls the fan to run at the corresponding speed according to the criterion, while keeping the regenerated water circuit closed. When the criterion forming module outputs the water cooling mode criterion, the execution module opens the valves on the reclaimed water inlet pipe and / or the reclaimed water outlet pipe, and starts the reclaimed water conveying equipment, so that the reclaimed water flows through the heat exchange coil. At the same time, the fan can stop running or remain in a low-speed auxiliary state. When the criterion forming module outputs the criterion for the combined cooling mode of air and water, the execution module simultaneously starts the fan and the regenerated water circuit, and adjusts the fan speed and regenerated water flow according to the optimization criteria to improve heat dissipation capacity and take into account the economic efficiency of operation. When the criterion forming module outputs alarm criteria, the execution module triggers the audible and visual alarm device and / or the remote alarm device, and can simultaneously perform protective actions such as shutdown, switching to safe mode, or maintaining operation at maximum heat dissipation intensity.

[0059] Preferably, in the forced air cooling mode and the combined air-water cooling mode, the execution module can adjust the input frequency or input power of the fan motor according to the fan speed control signal, thereby changing the fan speed; in the water cooling mode and the combined air-water cooling mode, the execution module can adjust the opening degree of the electric valve and / or the operating frequency of the reclaimed water conveying equipment according to the flow regulation control signal, thereby changing the reclaimed water flow rate.

[0060] In this way, the execution module can convert the mode selection criteria and optimization criteria output by the criterion formation module into actual control actions, thereby realizing the switching of the temperature control mode of the electrical control cabinet and the dynamic adjustment of the fan speed and regenerated water flow.

[0061] The aforementioned control system can be implemented using hardware, software, or a combination of both. For example, the control system may include one or more of the following: industrial controller, PLC, microcontroller control board, embedded controller, industrial computer, memory, data acquisition card, analog input / output interface, digital input / output interface, and communication module. Among these, data acquisition components such as internal and external temperature sensors, flow meters, pressure gauges, thermometers, wind pressure probes, or differential pressure gauges are used to provide operational data to the control system. The processor in the control system calls the pre-stored thermal calculation model of the heat exchange equipment, the system energy efficiency calculation model, and the control program in the memory to execute the aforementioned data calculation, criterion formation, and control output steps.

[0062] The execution components corresponding to the execution module may include one or more of the following: fan motor, frequency converter, electric regulating valve, water pump driver, relay, contactor, alarm and remote communication terminal.

[0063] In the software implementation, the aforementioned model calculation module, data acquisition and storage module, data processing module, criterion formation module, and execution module can be functional program modules executed by a processor; in the hardware implementation, the aforementioned modules can also be implemented by corresponding functional circuits or dedicated control units; in practical applications, a combination of hardware and software implementation is preferred.

[0064] In other embodiments, if the electrical control cabinet housing has already been made, a cabinet with the above structure can be added to the outside of the electrical control cabinet, or it can be used for an existing electrical control cabinet.

[0065] This application embodiment also provides a method for temperature control of outdoor electrical control cabinets based on reclaimed water cooling. The outdoor electrical control cabinet temperature control device based on reclaimed water cooling in this application embodiment can achieve low-energy temperature control based on this method. like Figure 5 A method for temperature control of an outdoor electrical control cabinet based on reclaimed water cooling includes the following steps: S1. Input the various settings; In this embodiment, after the control system is started, the various set values ​​required for temperature control of the electrical control cabinet are first input. The set values ​​include the reasonable operating temperature range of the electrical control cabinet, the internal temperature threshold of the cabinet, and the external ambient temperature threshold of the cabinet.

[0066] Specifically, taking an outdoor submersible pump control cabinet of a sewage treatment plant in Nanjing as an example, and considering the working environment requirements of the control cabinet, the reasonable working temperature range of the control cabinet is determined to be -5℃ to 40℃. Based on this, the temperature threshold inside the cabinet includes a first preset value, a second preset value, and a third preset value. The first preset value is less than the second preset value, and the second preset value is less than the third preset value. Specifically, the first preset value is set to 30℃, the second preset value is set to 40℃, and the third preset value is set to 45℃. The external ambient temperature threshold includes a high temperature preset value, which is 35℃, and the specific range of the high temperature preset value is 30℃-50℃.

[0067] In this embodiment, the above-mentioned set values ​​can be pre-input and stored in the control system through the controller's human-machine interface, host computer software, or parameter input terminal.

[0068] In other embodiments, the above-mentioned settings can also be adjusted according to different regional climate conditions, temperature resistance requirements of different internal components of the electrical control cabinet, different cabinet sizes, and different operating loads. For example, for electrical control cabinets with a large number of internal temperature-sensitive components, the first-level and second-level preset values ​​can be appropriately reduced; for outdoor equipment in high-temperature areas, the external ambient temperature threshold can be appropriately reduced. Furthermore, the internal temperature threshold is not limited to three preset values; two or four preset values ​​can be selected depending on different local conditions. The external ambient temperature threshold can also include a low-temperature preset value, as well as a first-level high-temperature warning value, a second-level high-temperature warning value, etc.

[0069] S2, invoke the device calculation model; In this embodiment, the control system invokes the control calculation module to process preset values, equipment parameters, and / or environmental parameters. Preferably, the control calculation module may include a heat exchanger thermal calculation model and / or a system energy efficiency calculation model, used to calculate the operating capacity of the heat exchanger and the economic efficiency of the system operation. In other embodiments, the control calculation module may also use only temperature threshold comparison logic, empirical control rules, lookup table methods, or other existing control algorithms in conventional PLC control programs, without invoking the heat exchanger thermal calculation model and the system energy efficiency calculation model.

[0070] For example, in the basic implementation, the corresponding temperature control mode control signal can be output simply by comparing the values ​​collected by the internal temperature sensor and the external temperature sensor with the preset internal temperature threshold and external ambient temperature threshold.

[0071] S3. Collect internal and external parameters of the cabinet; In this embodiment, after calling the device calculation model, the control system collects the current operating parameters inside and outside the cabinet through sensors and detection elements, which serve as input data for subsequent mode judgment and control execution.

[0072] Specifically, the collected parameters include at least: cabinet internal temperature parameters (collected by a temperature sensor located inside the control cabinet); cabinet external ambient temperature parameters (collected by a temperature sensor located outside the control cabinet); fan speed or operating status; reclaimed water flow rate and velocity; reclaimed water inlet and outlet temperatures; operating status and energy consumption of the reclaimed water conveying equipment; inverter parameters and operating status inside the control cabinet; and the operating time of the control cabinet.

[0073] S4. Determine whether the temperature inside the cabinet exceeds the first-level preset value. If "yes", proceed to step S5; if "no", proceed to step S6. S5. Determine whether the temperature inside the cabinet exceeds the secondary preset value. If "yes", proceed to step S7; if "no", proceed to step S8. S6. Determine whether the outside temperature exceeds the high temperature threshold. If "yes", proceed to step S9; if "no", proceed to step S10. S7. Determine whether the temperature inside the cabinet exceeds the preset value of level three. If "yes", proceed to step S11; if "no", proceed to step S12. S8. Determine whether the outside temperature exceeds the high temperature threshold. If "yes", proceed to step S13; if "no", proceed to step S14. S9. Run the water cooling mode, and restart step S3 after the set time. S10. Run the natural air cooling mode, and restart step S3 after the set time. S11, Triggering an over-temperature alarm; S12. Determine whether the outside temperature exceeds the high temperature threshold. If "yes", proceed to step S15; if "no", proceed to step S16. S13. Run water cooling mode, and restart step S3 after the set time. S14. Run the forced air cooling mode, and restart step S3 after the set time. S15. Run the combined air-water cooling mode, and restart step S3 after the set time. S16; Run water cooling mode, run for the set time, and then restart step S3.

[0074] That is, when the temperature parameter inside the cabinet is lower than the first preset temperature and the temperature parameter outside the cabinet is lower than the high temperature preset value, the temperature control mode is determined to be the natural air cooling mode. When the internal temperature parameter is lower than the first preset temperature and the external temperature parameter is greater than or equal to the high temperature preset value, the temperature control mode is determined to be water cooling mode. When the internal temperature parameter is greater than or equal to the first preset temperature and less than the second preset temperature, and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the forced air cooling mode. When the internal temperature parameter is greater than or equal to the first preset temperature and less than the second preset temperature, and the external temperature parameter is greater than or equal to the high temperature preset value, the temperature control mode is determined to be water cooling mode. When the internal temperature parameter is greater than or equal to the second preset temperature and less than the third preset temperature, and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be water cooling mode. When the internal temperature parameter is greater than or equal to the second preset temperature and less than the third preset temperature, and the external temperature of the control cabinet is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the combined air-water cooling mode. An alarm is triggered when the temperature inside the cabinet is greater than or equal to the third preset temperature.

[0075] Each mode runs for one hour. After one hour, the temperature inside and outside the cabinet is collected again, and the system returns to S3.

[0076] In other embodiments, depending on the local environment, the temperature control mode of the electrical control cabinet may vary based on the comparison results of the cabinet internal temperature parameters and the cabinet internal temperature threshold, as well as the comparison results of the cabinet external ambient temperature parameters and the cabinet external ambient temperature threshold.

[0077] In a preferred embodiment of this application, during the operation of the temperature control unit, that is, when executing steps S9, S10, S13, S14, S15 and S16, the control system not only drives the corresponding temperature control unit to operate according to the determined temperature control mode, but also dynamically adjusts the operating intensity of the temperature control unit to further reduce system energy consumption while meeting the current heat dissipation requirements.

[0078] Specifically, the control system continuously collects internal and external temperature parameters, as well as operating parameters related to the current temperature control mode, during operation. These operating parameters may include: reclaimed water flow rate and / or velocity, reclaimed water inlet and outlet temperatures, fan speed, fan input power, input power of the reclaimed water conveying equipment, inverter parameters and operating status within the control cabinet, and the control cabinet's operating time. Based on a pre-called control calculation module, the control system processes these collected parameters to obtain the control cabinet's heat load value under the current operating conditions.

[0079] In this embodiment, the heat load value is used to characterize the actual heat that the electrical control cabinet needs to remove. It can be estimated based on the internal and external temperature parameters of the cabinet, the heating state of the internal components, the thermal parameters of the enclosure structure, and the dimensions of the electrical control cabinet. For example, the current heat load value can be obtained based on the power loss of the internal components and the amount of heat exchange between the cabinet surface and the environment. Further, the control system determines the current cooling load value based on the heat load value. Here, the cooling load value can be understood as the cooling capacity required to maintain the temperature of the electrical control cabinet within the target range at the current moment. It can be equal to the current heat load value, or it can be modified based on the heat load value in combination with temperature deviation and control margin, thus serving as the basis for the temperature control unit to perform intensity adjustment.

[0080] In both water-cooled and combined water-air cooling modes, the control system adjusts the reclaimed water flow rate in real time based on the cooling load. Specifically, when the cooling load increases, it indicates that the control cabinet needs to remove more heat. In this case, the reclaimed water flow rate can be increased by increasing the opening of the regulating valve and / or increasing the operating frequency of the reclaimed water delivery equipment. Conversely, when the cooling load decreases, the reclaimed water flow rate is reduced accordingly to avoid unnecessary energy consumption caused by maintaining a high flow rate after the heat dissipation demand has decreased. This method ensures that the water-side heat exchange capacity in both water-cooled and combined water-air cooling modes matches the current heat dissipation requirements.

[0081] In forced air cooling mode, the control system adjusts the fan speed in real time according to the cooling load value. Specifically, when the cooling load value increases, the fan speed is increased to increase the airflow, thereby enhancing the air-side convective heat transfer capacity; when the cooling load value decreases, the fan speed is reduced to reduce unnecessary power consumption of the fan motor. This ensures that the cooling intensity in forced air cooling mode is adapted to the current heat dissipation demand, avoiding energy waste caused by long-term high-speed fan operation.

[0082] Furthermore, in this embodiment, the control system also collects and stores the real-time and cumulative power consumption of each temperature control unit, and calculates the real-time system energy efficiency value and the cumulative system energy efficiency value in conjunction with the current cooling load value. The real-time system energy efficiency value reflects the actual cooling capacity corresponding to the unit energy consumption at the current moment, while the cumulative system energy efficiency value reflects the overall economic efficiency of the operation of each temperature control unit within a certain operating time range. Preferably, the real-time system energy efficiency value can be obtained from the ratio of the current cooling capacity to the current power consumption, and the cumulative system energy efficiency value can be obtained from the ratio of the cumulative cooling capacity to the cumulative power consumption over a certain period of time.

[0083] In the combined air-water cooling mode, the control system further adjusts the reclaimed water flow and fan speed in a coordinated manner based on the real-time system energy efficiency value. Specifically, while meeting the current cooling load requirements, the control system compares the real-time system energy efficiency values ​​corresponding to different airflow-water flow combinations, and then selects the combination with the best energy efficiency.

[0084] For example, when increasing the fan speed no longer significantly improves system energy efficiency, but appropriately increasing the reclaimed water flow rate can achieve a higher cooling capacity per unit energy consumption, then the reclaimed water flow rate should be increased first, and the fan speed reduced. Conversely, when increasing the water flow rate results in a small improvement in energy efficiency, but appropriately increasing the fan speed can achieve better system energy efficiency, then the fan speed should be increased first. Therefore, in the combined cooling mode, it's not simply a matter of simultaneously increasing the operating intensity of the fan and water pump, but rather coordinating and controlling both based on real-time system energy efficiency values. This ensures effective temperature control while further reducing energy consumption in the combined cooling mode.

[0085] Furthermore, in this embodiment, the control system can also optimize and adjust the cabinet temperature threshold based on the accumulated system energy efficiency value. Specifically, after the system has been running for a period of time, the control system performs statistical analysis on the cumulative power consumption, cumulative cooling effect, and cumulative system energy efficiency value under different temperature control modes. If the analysis results show that the activation ratio of a certain high-energy-consumption mode is too high and the corresponding cumulative system energy efficiency value is too low, it indicates that the current cabinet temperature threshold setting may be too conservative, causing the system to enter the high-energy-consumption mode too early. In this case, the first preset value, the second preset value, and the third preset value can be appropriately adjusted within the safe allowable range to delay the activation of the high-energy-consumption mode. Conversely, if the analysis results show that the system frequently experiences high-temperature alarms or the cabinet temperature remains at a high level for a long time, it indicates that the current temperature threshold setting may be too lenient. In this case, the corresponding preset value can be appropriately reduced to allow the high-intensity temperature control mode to intervene earlier. Through the above methods, the control system can continuously optimize the cabinet temperature threshold based on the accumulated system energy efficiency value during long-term operation, thereby making subsequent mode switching more in line with actual working conditions and energy-saving requirements.

[0086] Therefore, in this embodiment, the temperature control system of the electrical control cabinet can not only achieve reasonable switching between natural air cooling mode, forced air cooling mode, water cooling mode and air-water combined cooling mode by comparing the temperature thresholds inside and outside the cabinet, but also can further achieve dynamic adjustment of the execution intensity within each temperature control mode that requires energy consumption, and optimize and adjust the temperature threshold inside the cabinet based on the cumulative system energy efficiency value over a longer time scale, thereby forming a multi-level energy-saving control mechanism of "mode selection - in-mode adjustment - threshold optimization".

[0087] The implementation principle of this application embodiment is as follows: This invention constructs a multi-level progressive energy-saving temperature control mechanism. First, by preset the internal temperature threshold and the external ambient temperature threshold, and combining the internal temperature parameters and the external ambient temperature parameters for joint judgment, a temperature control scheme matching the current operating conditions is selected from natural air cooling mode, forced air cooling mode, water cooling mode, and air-water combined cooling mode. This avoids the problem of high energy consumption and poor adaptability of a single heat dissipation method under different operating conditions, and prioritizes the temperature control mode with lower energy consumption while ensuring heat dissipation effect. Furthermore, based on the determined temperature control mode, the regenerated water flow rate and fan speed can be adjusted in real time according to the current cooling load value, so that the operating intensity of the water pump and fan matches the current actual heat dissipation demand, avoiding energy waste caused by fixed high flow rate or fixed high speed operation. Furthermore, the internal temperature threshold can also be optimized and adjusted according to the accumulated system energy efficiency value and / or total power consumption, so that the subsequent temperature control mode switching is more in line with the actual operating conditions and energy-saving requirements, thereby forming a multi-level energy-saving control system from mode selection, in-mode adjustment to threshold optimization.

[0088] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for temperature control of an outdoor electrical control cabinet based on reclaimed water cooling, characterized in that: Includes the following steps: Obtain the internal temperature parameters and the external ambient temperature parameters of the cabinet; Preset cabinet internal temperature threshold and cabinet external ambient temperature threshold; Based on the comparison results of the cabinet internal temperature parameters and the cabinet internal temperature threshold, and the comparison results of the cabinet external ambient temperature parameters and the cabinet external ambient temperature threshold, the temperature control mode of the electrical control cabinet is determined. According to the determined temperature control mode, the corresponding temperature control unit is controlled to operate in order to control the temperature of the electrical control cabinet; The temperature control mode includes at least one of the following: natural air cooling mode, forced air cooling mode, water cooling mode, and combined air and water cooling mode; The cooling water used in the water-cooling mode and the combined air-water cooling mode is recycled water from the sewage treatment plant.

2. The outdoor electrical control cabinet temperature control method based on reclaimed water cooling according to claim 1, characterized in that: The cabinet temperature threshold includes a first preset value, a second preset value, and a third preset value, wherein the first preset value is less than the second preset value, and the second preset value is less than the third preset value; The external ambient temperature threshold includes a high-temperature preset value; When the internal temperature parameter is less than the first preset temperature and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the natural air cooling mode. When the internal temperature parameter is less than the first preset temperature and the external temperature parameter is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the water cooling mode. When the internal temperature parameter is greater than or equal to the first preset temperature and less than the second preset temperature, and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the forced air cooling mode. When the internal temperature parameter is greater than or equal to the first preset temperature and less than the second preset temperature, and the external temperature parameter is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the water cooling mode. When the internal temperature parameter is greater than or equal to the second preset temperature and less than the third preset temperature, and the external temperature parameter is less than the high temperature preset value, the temperature control mode is determined to be the water cooling mode. When the internal temperature parameter of the cabinet is greater than or equal to the second preset temperature and less than the third preset temperature, and the external temperature of the electrical control cabinet is greater than or equal to the high temperature preset value, the temperature control mode is determined to be the combined air-water cooling mode. An alarm is triggered when the temperature parameter inside the cabinet is greater than or equal to the third preset temperature.

3. The outdoor electrical control cabinet temperature control method based on reclaimed water cooling according to claim 1, characterized in that: After the current temperature control mode has been running for a preset time, the internal temperature parameters and external ambient temperature parameters are reacquired. Based on the comparison results of the reacquired internal temperature parameters and the internal temperature threshold, and the comparison results of the reacquired external ambient temperature parameters and the external ambient temperature threshold, the temperature control mode is re-determined.

4. The outdoor electrical control cabinet temperature control method based on reclaimed water cooling according to claim 1, characterized in that: During the operation of the temperature control unit, the heat load value of the electrical control cabinet is calculated in real time; Determine the current cooling load value based on the heat load value; In the water-cooling mode and the combined air-water cooling mode, the regenerated water flow rate is adjusted in real time according to the cooling load value; In the forced air cooling mode, the fan speed is adjusted in real time according to the cooling load.

5. The outdoor electrical control cabinet temperature control method based on reclaimed water cooling according to claim 4, characterized in that: Collect and store the real-time and cumulative power consumption of each temperature control unit, and combine it with the current cooling load value to perform real-time and cumulative calculations to obtain the real-time system energy efficiency value and cumulative system energy efficiency value of each temperature control unit. In the combined air-water cooling mode, the reclaimed water flow rate and fan speed are adjusted according to the real-time system energy efficiency value; The cabinet temperature threshold is optimized and adjusted based on the accumulated system energy efficiency value.

6. An outdoor electrical control cabinet device based on reclaimed water cooling, characterized in that: The method for controlling the temperature of an outdoor electrical control cabinet based on reclaimed water cooling as described in claims 1-6 includes a cabinet (1), a fan (13) installed inside the cabinet (1), a heat exchange coil (21) installed on the inner wall of the cabinet (1), a reclaimed water inlet pipe (22) connected to the water inlet end of the heat exchange coil (21), and a reclaimed water outlet pipe (23) connected to the water outlet end of the heat exchange coil (21). The cabinet (1) is also equipped with a control system, which is used to preset values, collect parameters and calculate, and judge and control the operating status of the fan (13) and the pump body based on the collected information.

7. The outdoor electrical control cabinet device based on reclaimed water cooling according to claim 6, characterized in that: The control system includes a model calculation module, a data acquisition and storage module, a data processing module, a criterion formation module, and an execution module; Both the reclaimed water outlet pipe (23) and the reclaimed water inlet pipe (22) are equipped with valves (24), flow meters (25), pressure gauges, and thermometers (27); A cabinet temperature sensor is installed inside the cabinet (1), and an external temperature sensor is installed outside the cabinet (1). The model calculation module includes a heat exchange equipment thermal calculation model and a system energy efficiency calculation model; The data acquisition and storage module can acquire and store the data required by the thermal calculation model of the heat exchange equipment and the energy efficiency calculation model of the system; The data processing module can perform calculations based on the collected and stored data, according to the thermal calculation model of the heat exchange equipment and the energy efficiency calculation model of the system. The criterion forming module can compare the data obtained by the calculation model module, the data acquisition and storage module, and the data processing module with the cabinet internal temperature threshold and the cabinet external ambient temperature threshold, and at the same time compare and calculate the system energy efficiency under each operating mode to form a criterion for the system to execute the optimized operating mode. The execution module can optimize and switch the system's operating mode based on the criteria obtained by the criteria forming module.

8. The outdoor electrical control cabinet device based on reclaimed water cooling according to claim 6, characterized in that: The air outlet (11) of the cabinet (1) is located on its top. Both the air outlet (11) and the air inlet of the cabinet (1) are equipped with air filters. Differential pressure sensors (16) are installed on the air inlet side and the air-facing side of the air filters.

9. The outdoor electrical control cabinet device based on reclaimed water cooling according to claim 6, characterized in that: The outer surface of the control cabinet is coated with a radiation cooling coating.

10. The outdoor electrical control cabinet device based on reclaimed water cooling according to claim 6, characterized in that: The data collected and stored by the data acquisition and storage module includes the inverter parameters and operating status inside the electrical control cabinet, the allowable operating temperature range of the electrical control cabinet, the internal temperature of the electrical control cabinet, the external ambient temperature of the electrical control cabinet, the fan speed, the flow rate and velocity of reclaimed water, the inlet and outlet temperatures of reclaimed water, the power consumption of the fan, the energy consumption of the equipment for conveying reclaimed water, the structural parameters of the indirect heat exchange equipment, and the operating time of the electrical control cabinet.

Images