A temperature-controlled water cooling system and its control method

Abstract

This invention discloses a temperature-controlled water cooling system and its control method, belonging to the field of accelerator technology. The system includes a cooling circuit, a heat exchange circuit, and a refrigeration circuit. The cooling circuit includes a main circulation circuit and a bypass branch. The main circulation circuit includes a first pump. The coolant output from the first pump flows sequentially through the cold-side inlet and cold-side outlet of a plate heat exchanger. A portion of the coolant output from the cold-side outlet of the plate heat exchanger flows sequentially through a first electric heater, a buffer tank, a load, and a mixing tank, and then flows back to the first pump. The remaining portion of the coolant output from the cold-side outlet of the plate heat exchanger flows sequentially through the bypass branch and the mixing tank, and then flows back to the first pump. This invention achieves high-precision control of the accelerator cavity wall temperature by separately controlling the inner and outer cavity wall temperatures, reducing manual intervention, and improving the operational stability of the accelerator equipment.

Description

Technical Field

[0001] This invention relates to a temperature-controlled water cooling system and its control method, belonging to the field of accelerator cooling technology. Background Technology

[0002] Particle injection-end accelerators (DTLs) require highly stable cavity wall temperatures. The accelerator itself is one component of this system. While the DTL generates heat, a continuous heating and cooling system is essential to remove it. This system also precisely controls the accelerator wall temperature to ensure that deformation of the acceleration cavity remains within extremely low limits. Otherwise, particle displacement during acceleration will occur, leading to abnormal acceleration or failure to accelerate properly. The accelerator requires very precise cavity wall temperature control, typically ±0.1℃ or higher.

[0003] Current equipment can achieve relatively high precision in single-water temperature control, but it only controls the wall temperature based on the inlet water temperature, without considering the impact of natural heat dissipation from the room. This requires constant monitoring of the wall temperature and continuous adjustment of the water temperature based on experience, resulting in very low intelligence and the wall temperature easily exceeding the required range. For example, patent CN117707250A uses a three-way valve to control water temperature changes to control the wall temperature, failing to consider the impact of flow rate changes on the overall temperature and the influence of natural convection heat transfer on wall temperature control. Current constant temperature systems employ a small temperature difference design, increasing flow rate and reducing the load temperature difference. This approach cannot handle large temperature differences, leading to poor temperature control and failing to achieve high precision. Current equipment is prone to flow rate changes in the heat exchange loop during temperature control, affecting the chiller's temperature stability and further impacting the stability of the required water temperature. Current equipment does not effectively consider the overall impact of flow rate changes on temperature control. Current control uses only a single PID controller for single-parameter control, lacking coordinated changes and exhibiting poor controllability.

[0004] In summary, existing temperature-controlled water cooling systems only control the wall temperature of the cavity based on the inlet water temperature, without considering the impact of natural heat dissipation from the room on the wall temperature. This makes it difficult to accurately control the accelerator's wall temperature and affects the system's performance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a temperature-controlled water cooling system and its control method. The system controls the inner wall temperature of the cavity through the main circulation loop and controls the outer wall temperature of the cavity through the bypass branch, thereby achieving separate control of the inner and outer wall temperatures of the accelerator cavity. This enables high-precision control of the accelerator cavity wall temperature, reduces manual intervention, and improves the stability of accelerator equipment operation.

[0006] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0007] In a first aspect, the present invention provides a temperature-controlled water cooling system, including a cooling circuit, a heat exchange circuit, and a refrigeration circuit;

[0008] The cooling circuit includes a main circulation circuit and a bypass branch. The main circulation circuit includes a first pump. The coolant output from the first pump flows sequentially through the cold side inlet and the cold side outlet of the plate heat exchanger. A portion of the coolant output from the cold side outlet of the plate heat exchanger flows sequentially through a first electric heater, a buffer tank, a load, and a mixing tank, and then flows back to the first pump.

[0009] The remaining coolant output from the cold side outlet of the plate heat exchanger is used to flow sequentially through the bypass branch and the mixing tank, and then back into the first pump.

[0010] The mixing tank is used to mix the coolant output from the load and the coolant output from the bypass branch, and output the mixed coolant to the first pump.

[0011] The load is located in a cavity, the main circulation loop is used to regulate the temperature of the inner wall of the cavity, and the bypass branch is used to regulate the temperature of the outer wall of the cavity.

[0012] The heat exchange circuit includes a second pump, the coolant output by the second pump flows sequentially through the hot-side inlet of the evaporator, the hot-side outlet of the evaporator, a constant flow valve, a three-way regulating valve, the hot-side inlet of the plate heat exchanger, and the hot-side outlet of the plate heat exchanger, and flows back to the second pump; wherein, the three-way regulating valve is connected to the second pump;

[0013] The refrigeration circuit includes a compressor, and the coolant output by the compressor flows sequentially through a condenser, a dryer filter, an expansion valve, the cold-side inlet of the evaporator, and the cold-side outlet of the evaporator, and then flows back into the compressor.

[0014] Furthermore, the bypass branch includes a second flow transmitter, a finned tube heat exchanger, a regulating valve, and an ion tank connected in sequence. The second flow transmitter is connected to the cold side outlet of the plate heat exchanger, the ion tank is connected to the mixing tank, and a fan is arranged on one side of the cavity on the outer wall of the finned tube heat exchanger.

[0015] Furthermore, the bypass branch also includes a second electric heater, and the second flow transmitter is connected to the cold side outlet of the plate heat exchanger through the second electric heater.

[0016] Furthermore, the cooling circuit also includes a first temperature transmitter for monitoring the cold-side outlet temperature of the plate heat exchanger, a second temperature transmitter for monitoring the outlet temperature of the first electric heater, a third temperature transmitter for monitoring the load inlet temperature, an ambient temperature transmitter for monitoring the inlet ambient temperature of the finned tube heat exchanger, a first wall temperature transmitter for monitoring the front-end wall temperature of the load, a second wall temperature transmitter for monitoring the rear-end wall temperature of the load, a fifth temperature transmitter for monitoring the load outlet temperature, a first flow transmitter for monitoring the load flow rate, a conductivity transmitter for monitoring the load conductivity, and a pressure transmitter for monitoring the inlet pressure of the first pump. The load is connected to the first flow transmitter via a main circulation loop regulating valve.

[0017] The bypass branch also includes a fourth temperature transmitter for monitoring the outlet temperature of the second electric heater.

[0018] Furthermore, the heat exchange circuit also includes a sixth temperature transmitter for monitoring the inlet temperature of the three-way regulating valve;

[0019] The refrigeration circuit also includes a seventh temperature transmitter for monitoring the cold-side outlet temperature of the evaporator and a compressor inlet pressure transmitter for monitoring the compressor inlet pressure.

[0020] Furthermore, both the first electric heater and the second electric heater are equipped with power regulators; the fan is a variable frequency fan.

[0021] Furthermore, the mixing tank has a first opening, a second opening, and a mixing outlet. The first opening is connected to the ion tank, the second opening is connected to the load, and the mixing outlet is connected to the first pump. The mixing tank has a first diversion plate communicating with the first opening, and a second diversion plate is provided on one side of the first diversion plate. The second diversion plate is communicating with the second opening. Both the first and second diversion plates have multiple diversion holes, and the inner wall of the mixing tank is provided with multiple baffles arranged alternately.

[0022] Secondly, the present invention provides a control method for a temperature-controlled water cooling system, based on the temperature-controlled water cooling system described in the first aspect, including internal control and external control, wherein the internal control is used to adjust the inner wall temperature of the cavity, and the external control is used to adjust the outer wall temperature of the cavity.

[0023] Specifically, the internal control includes:

[0024] According to the preset target value, the flow rate of the main circulation loop is adjusted by the first flow transmitter, and the flow rate of the bypass branch is adjusted by the second flow transmitter.

[0025] The inlet temperature of the three-way regulating valve is controlled within the second range by the compressor and condenser, and the inlet temperature of the three-way regulating valve is monitored by the sixth temperature transmitter.

[0026] The hot-side inlet temperature of the plate heat exchanger is controlled by a three-way regulating valve, thereby controlling the cold-side outlet temperature of the plate heat exchanger. The cold-side outlet temperature of the plate heat exchanger is monitored by a first temperature transmitter, so that the cold-side outlet temperature of the plate heat exchanger is lower than the required temperature T.

[0027] The outlet temperature of the first electric heater is controlled within a third range by the first electric heater, and the outlet temperature of the buffer water tank is controlled within a fourth range by the buffer water tank, thereby controlling the inlet temperature of the load within a first range. The inlet temperature of the load is monitored by the third temperature transmitter, so that the inner wall temperature of the cavity is within a preset range, thus completing the internal control.

[0028] The power of the first electric heater is calculated using the following formula:

[0029] ;

[0030] In the formula: The power of the first electric heater, The specific heat capacity of the liquid in the cooling circuit. The flow rate of the main circulation loop. T0 is the density of the liquid in the cooling circuit, T1 is the cold side outlet temperature of the plate heat exchanger, and T2 is the set outlet temperature of the first electric heater.

[0031] In this process, a neural network-based PID controller is used to calculate the adjustment value of the power regulator for the first electric heater, ensuring that the power of the first electric heater is... .

[0032] Furthermore, the external control specifically includes:

[0033] When the inner wall temperature of the cavity is within a preset range, the front wall temperature of the load is obtained through the first wall temperature transmitter, and the rear wall temperature of the load is obtained through the second wall temperature transmitter.

[0034] Obtain the ambient temperature, and calculate the average temperature based on the front and rear wall temperatures of the load.

[0035] The average temperature is compared with the preset range. If the average temperature is within the preset range, the operation ends; otherwise, both the ambient temperature and the average temperature are compared with the required temperature T, and the working status is adjusted according to the comparison results.

[0036] The adjustment of the working status based on the comparison results specifically includes:

[0037] If the average temperature is lower than the required temperature T, and the required temperature T is higher than the ambient temperature, then the power of the second electric heater is calculated using the following formula:

[0038] ;

[0039] In the formula: The power of the second electric heater. To bypass the flow of the branch road, The average temperature. Ambient temperature;

[0040] Based on the average temperature, a neural network-controlled PID controller is used to control the fan on the finned tube heat exchanger, so that the outer wall temperature of the cavity is within a preset range.

[0041] If the average temperature is lower than the required temperature T, and the required temperature T is not greater than the ambient temperature, then the power of the second electric heater is calculated using the following formula:

[0042] ;

[0043] Based on the average temperature, a neural network-controlled PID controller is used to control the fan on the finned tube heat exchanger, so that the outer wall temperature of the cavity is within a preset range.

[0044] If the average temperature is not less than the required temperature T, and the required temperature T is not greater than the ambient temperature, then the cold side outlet temperature of the plate heat exchanger is controlled by the following formula:

[0045] Front-end plate heat exchanger outlet temperature ≤ ;

[0046] Based on the average temperature, a neural network-controlled PID controller is used to control the fan on the finned tube heat exchanger, so that the outer wall temperature of the cavity is within a preset range.

[0047] If the average temperature is not less than the required temperature T, and the required temperature T is greater than the ambient temperature, then the cold side outlet temperature of the plate heat exchanger is controlled by the following formula:

[0048] Front-end plate heat exchanger outlet temperature ≤ ;

[0049] Based on the average temperature, a neural network-controlled PID controller calculates the adjustment value of the fan on the finned tube heat exchanger, so that the outer wall temperature of the cavity is within a preset range.

[0050] Furthermore, the neural network control of PID specifically includes:

[0051] The initial PID values ​​include the scaling factor. Integral factor and differential factors ;

[0052] Input feature values ​​include the current error Error change rate Cumulative error ;

[0053] The output PID increment target includes the proportional factor increment ΔKp, the integral factor increment ΔKi, and the derivative factor increment ΔKd;

[0054] make To control and adjust the amount of change;

[0055] Let the sampling period be set to Δt;

[0056] Set the target temperature to T_actual, collect the current temperature T_actual, and T_set is the set target temperature;

[0057] Calculation error = T_set - T_actual;

[0058] Error change rate Where k represents the error of the kth iteration; This represents the calculation error for the (k-1)th term;

[0059] The historical error over a certain time period t is taken as the cumulative error. , where i is the error number not greater than k;

[0060] Let k1 and k2 be the minimum and maximum values ​​of the allowable error range for the target temperature, respectively. After normalization, with the input normalized to [k1, k2], the maximum error range is k2 - k1. The specific expression is as follows:

[0061] Current error normalization: ;in, This is the current error after normalization;

[0062] Error rate of change normalization: ;in, This is the normalized rate of change of error;

[0063] Cumulative error normalization: ;in, This is the normalized cumulative error;

[0064] Determine the parameters of hidden layer neurons:

[0065] ;

[0066] ;

[0067] Where: A1, A2, A3, B1, B2, B3, C1, C2, D1, D2, E1, E2 are neuron weight parameters; W1, W2 represent neuron weight matrices in the neural network;

[0068] Activating computation using the Tanh function of a neural network:

[0069] ;

[0070] ;

[0071] H1 and H2 represent the nonlinear transformation results of the neurons on the input features;

[0072] Calculate the changes in each PID parameter: proportional factor increment ΔKp, integral factor increment ΔKi, derivative factor increment ΔKd:

[0073] ;

[0074] ;

[0075] ;

[0076] The adjusted PID includes the adjusted scaling factor. Adjusted integration factor and adjusted differential factors ,as follows:

[0077] ;

[0078] ;

[0079] ;

[0080] The control adjustment change is generated as follows:

[0081] ;

[0082] The adjustment value is determined based on the change in control.

[0083] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0084] 1. This temperature-controlled water cooling system controls the inner wall temperature of the cavity through the main circulation loop and controls the outer wall temperature of the cavity through the bypass branch, realizing separate control of the inner and outer wall temperatures of the accelerator cavity. This achieves high-precision control of the accelerator cavity wall temperature, reduces manual intervention, and improves the stability of accelerator equipment operation.

[0085] 2. This temperature-controlled water cooling system provides a mixing tank structure, which is beneficial to the stability of the system and reduces the system's sensitivity to temperature differences. It can be applied to high-precision temperature control under conditions of small load, large flow rate, and large temperature difference, ensuring the effectiveness of the invention. The heat exchange circuit of the invention has a stable flow rate, which is beneficial to the temperature stability of the cooling circuit and also reduces the number of compressor start-ups and shutdowns in the refrigeration circuit, effectively improving the compressor's service life.

[0086] 3. This temperature-controlled water cooling system responds quickly and automatically to changes in ambient temperature, saving the need for manual intervention and adjustment of previous equipment, reducing error rates and labor costs, and effectively reducing system maintenance costs. This, in turn, improves treatment efficiency and stability to a certain extent, enhances the product quality of the accelerator, ensures product consistency and reliability, and contributes to the rapid development of the accelerator equipment application industry. Attached Figure Description

[0087] Figure 1 This is a schematic diagram of the system structure of a temperature-controlled water cooling system according to an embodiment of the present invention;

[0088] Figure 2 This is a schematic diagram of the system structure of the cooling circuit provided in an embodiment of the present invention;

[0089] Figure 3 This is a schematic diagram of the structure of an ion tank provided according to an embodiment of the present invention;

[0090] Figure 4 This is a top view of the second diverter provided according to an embodiment of the present invention;

[0091] Figure 5 This is a logic diagram of a neural network controlling a PID according to an embodiment of the present invention.

[0092] In the diagram: 1. First pump; 2. Plate heat exchanger; 3. First temperature transmitter; 4. First electric heater; 5. Second temperature transmitter; 6. Buffer tank; 7. Third temperature transmitter; 8. Finned tube heat exchanger; 9. Load; 10. First flow transmitter; 11. Fifth temperature transmitter; 12. Second electric heater; 13. Fourth temperature transmitter; 14. First wall temperature transmitter; 15. Ambient temperature transmitter; 16. Second wall temperature transmitter; 17. 18. Ionizing tank; 19. Conductivity transmitter; 20. Mixing tank; 21. Pressure transmitter; 22. Second pump; 23. Evaporator; 24. Sixth temperature transmitter; 25. Three-way regulating valve; 26. Constant flow valve; 27. Compressor; 28. Condenser; 29. ​​Dryer filter; 30. Expansion valve; 31. Seventh temperature transmitter; 32. Compressor inlet pressure transmitter; 33. Second flow transmitter; 34. Main circulation loop regulating valve; 35. Regulating valve. Detailed Implementation

[0093] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0094] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0095] Example 1:

[0096] like Figure 1 As shown, the present invention provides a temperature-controlled water cooling system, including a cooling circuit, a heat exchange circuit, and a refrigeration circuit;

[0097] The cooling circuit includes a main circulation circuit and a bypass branch. The main circulation circuit includes a first pump 1. The coolant output from the first pump 1 flows sequentially through the cold-side inlet and the cold-side outlet of the plate heat exchanger 2. A portion of the coolant output from the cold-side outlet of the plate heat exchanger 2 flows sequentially through a first electric heater 4, a buffer tank 6, a load 9, and a mixing tank 19, and then flows back into the first pump 1. The load 9 is connected to the second opening of the mixing tank 19, and the first pump 1 is connected to the mixing outlet of the mixing tank 19.

[0098] The remaining coolant output from the cold side outlet of the plate heat exchanger 2 is used to flow sequentially through the bypass branch and the mixing tank 19, and then flows back into the first pump 1; the bypass branch is connected to the first opening of the mixing tank 19.

[0099] The mixing tank 19 is used to mix the coolant output from the load 9 and the coolant output from the bypass branch, and output the mixed coolant to the first pump 1.

[0100] The load 9 is located in a cavity, the main circulation loop is used to regulate the temperature of the inner wall of the cavity, and the bypass branch is used to regulate the temperature of the outer wall of the cavity.

[0101] The heat exchange circuit includes a second pump 21. The coolant output from the second pump 21 flows sequentially through the hot-side inlet of the evaporator 22, the hot-side outlet of the evaporator 22, a constant flow valve 25, a three-way regulating valve 24, the hot-side inlet of the plate heat exchanger 2, and the hot-side outlet of the plate heat exchanger 2, and then flows back into the second pump 21. The three-way regulating valve 24 is connected to the second pump 21. The heat exchange between the cooling circuit and the heat exchange circuit is achieved through the plate heat exchanger 2. The two outlets of the three-way regulating valve 24 are respectively connected to the hot-side inlet of the plate heat exchanger 2 and the inlet of the second pump 21. The three-way regulating valve 24 can be steplessly adjusted from 0% to 100% opening, and the flow rate into the hot-side inlet of the plate heat exchanger 2 and the inlet of the second pump 21 can be adjusted according to actual working requirements.

[0102] The refrigeration circuit includes a compressor 26. The coolant output by the compressor 26 flows sequentially through a condenser 27, a dryer filter 28, an expansion valve 29, the cold-side inlet of the evaporator 22, and the cold-side outlet of the evaporator 22, and then flows back into the compressor 26. The evaporator 22 enables heat exchange between the refrigeration circuit and the heat exchange circuit.

[0103] Specifically, the present invention includes a cooling circuit, a heat exchange circuit, and a refrigeration circuit. The main circulation circuit in the cooling circuit is used to cool the load 9, thereby controlling the temperature of the inner wall of the cavity. The bypass branch is used to distribute the coolant. By adjusting the flow distribution between the main circulation circuit and the bypass branch, the cold water and hot water output from the load 9 and the bypass branch are mixed through the mixing tank 19 to reduce the temperature difference. The heat exchange circuit is used to carry away the heat in the cooling circuit and transfer it to the refrigeration circuit, which dissipates the system's heat into the air. Both the compressor 26 and the condenser 27 fan can be continuously variable speed controlled. Figure 1 27a in the text refers to the fan of condenser 27.

[0104] like Figure 1 As shown, in this embodiment, the bypass branch includes a second flow transmitter 32, a finned tube heat exchanger 8, a regulating valve 34, and an ion tank 17 connected in sequence. The second flow transmitter 32 is connected to the cold side outlet of the plate heat exchanger 2, and the ion tank 17 is connected to the mixing tank 19. A fan is arranged on the outer wall of the finned tube heat exchanger 8 on one side of the cavity. The bypass branch also includes a second electric heater 12, and the second flow transmitter 32 is connected to the cold side outlet of the plate heat exchanger 2 through the second electric heater 12. 8a is the fan of the finned tube heat exchanger 8. Specifically, the present invention can control the temperature of the outer wall of the cavity by cooperating with the finned tube heat exchanger 8 and the fan.

[0105] like Figure 2As shown, in some possible embodiments, the cooling circuit includes a bypass branch and a main circulation circuit. The bypass branch is connected to the pipeline between the first temperature transmitter 3 and the first electric heater 4, and then sequentially connected to the second flow transmitter 32, the regulating valve 34, the ion tank 17, and then connected to the low-temperature water inlet of the mixing tank 19. In this embodiment, the bypass branch is only used to regulate the flow rate of the coolant entering the main circulation circuit, that is, to divert the coolant, thereby accurately controlling the temperature of the load 9 and realizing the temperature control of the inner wall of the cavity. This embodiment does not realize the temperature control of the outer wall of the cavity.

[0106] In this embodiment, the cooling circuit further includes a first temperature transmitter 3 for monitoring the cold side outlet temperature of the plate heat exchanger 2, a second temperature transmitter 5 for monitoring the outlet temperature of the first electric heater 4, a third temperature transmitter 7 for monitoring the inlet temperature of the load 9, an ambient temperature transmitter 15 for monitoring the inlet ambient temperature of the finned tube heat exchanger 8, a first wall temperature transmitter 14 for monitoring the front wall temperature of the load 9, a second wall temperature transmitter 16 for monitoring the rear wall temperature of the load 9, a fifth temperature transmitter 11 for monitoring the outlet temperature of the load 9, a first flow transmitter 10 for monitoring the flow rate of the load 9, a conductivity transmitter 18 for monitoring the conductivity of the load 9, and a pressure transmitter 20 for monitoring the inlet pressure of the first pump 1. The load 9 is connected to the first flow transmitter 10 through the main circulation circuit regulating valve 33.

[0107] The bypass branch also includes a fourth temperature transmitter 13 for monitoring the outlet temperature of the second electric heater 12;

[0108] The heat exchange circuit also includes a sixth temperature transmitter 23 for monitoring the inlet temperature of the three-way regulating valve 24;

[0109] The refrigeration circuit also includes a seventh temperature transmitter 30 for monitoring the cold side outlet temperature of the evaporator 22 and a compressor inlet pressure transmitter 31 for monitoring the inlet pressure of the compressor 26.

[0110] In this embodiment, both the first electric heater 4 and the second electric heater 12 are equipped with power regulators, which can steplessly adjust the output power of the first electric heater 4 and the second electric heater 12; the fan is a variable frequency fan, which can be steplessly adjusted from 0 to 50 Hz; the constant flow valve 25 is pre-set according to the actual required flow rate, and then automatically adjusts the flow rate to the required value according to the pressure change in the circuit, so that the flow rate of the heat exchange circuit remains stable.

[0111] like Figure 3 and Figure 4As shown in this embodiment, the mixing tank 19 has a first opening, a second opening, and a mixing outlet. The first opening is connected to the ion tank 17, the second opening is connected to the load 9, and the mixing outlet is connected to the first pump 1. The mixing tank 19 has a first diversion plate communicating with the first opening. The mixing tank 19 has a second diversion plate on one side of the first diversion plate, and the second diversion plate is communicating with the second opening. Both the first diversion plate and the second diversion plate have multiple diversion holes. The inner wall of the mixing tank 19 has multiple baffles arranged alternately.

[0112] Specifically, the mixing tank 19 is used for mixing hot and cold water. After the water is led out of the tank through the pipes, it is divided into thin streams by evenly distributed round holes around the perimeter. The water flow through the bypass branch flows into the dispersed pipes inside the tank through the pipes at the top of the mixing tank 19. The two water flows are dispersed and then fully mixed in the tank. Then, they are further fully mixed by the baffles inside the tank to ensure that the water temperature is stable.

[0113] In this embodiment, after the system is started, the flow ratio of the main circulation loop and the bypass branch of the cooling circuit is adjusted. The flow is adjusted by the main circulation loop regulating valve 33 and the first flow transmitter 10, and the second flow transmitter 32 and the regulating valve 34 of the bypass branch, so that the total coolant temperature rise after the two branches merge is ≤0.5℃.

[0114] The target temperature T is set according to the temperature required by load 9. The system adopts a two-stage temperature control method of heat exchange subcooling followed by control of electric heater heating. The target temperature control for the cold side outlet of plate heat exchanger 2 in the cooling circuit is set to T-0.2℃. Data feedback from the first temperature transmitter 3 used to monitor the cold side outlet temperature of plate heat exchanger 2 is used. The angle of the three-way regulating valve 24 in the intermediate heat exchange circuit is controlled by PID control, thereby controlling the flow rate of coolant entering the hot side inlet of plate heat exchanger 2 to control the heat exchange effect of plate heat exchanger 2. This controls the target temperature control for the cold side outlet of plate heat exchanger 2 to T-0.2℃, so that the temperature here is stabilized at the target temperature with the smallest possible deviation. Generally, the temperature control here is about ±0.1℃.

[0115] Then the coolant enters the first electric heater 4. The first electric heater 4 calculates the required output power and uses PID control to output power, keeping the temperature at T±0.07℃. Then it enters the buffer tank 6. The large-capacity tank buffers the temperature, keeping the accuracy at T±0.05℃, so that the coolant temperature entering the load 9 is continuously and stably at T±0.05℃.

[0116] To maintain the accuracy of the cold-side outlet temperature of plate heat exchanger 2, it is necessary to first maintain the stability of the cold-side inlet temperature of plate heat exchanger 2. When water exits from load 9, considering the influence of the environment and the water circuit structure of load 9, the temperature will fluctuate to a certain extent. Therefore, it is necessary to reduce this fluctuation. For this purpose, a mixing tank 19 is designed to stabilize the cold-side inlet temperature of plate heat exchanger 2. The flow rate into plate heat exchanger 2 is adjusted by a three-way regulating valve 24, thereby controlling the accuracy of the cold-side outlet temperature of plate heat exchanger 2.

[0117] The temperature accuracy of the inlet of the three-way regulating valve 24 is controlled within (T-5) ±0.5℃. Temperature control here primarily considers the impact of changes in the angle of the three-way regulating valve 24 on the flow rate. Therefore, a constant flow valve 25 is installed in the heat exchange circuit. When the flow rate fluctuates, the constant flow valve 25 automatically adjusts its opening to regulate the circuit flow rate, automatically adjusting it to reach the set value. The selected constant flow valve 25 plus the three-way regulating valve 24 control temperature stabilization time... ≤t, where t is the maximum time that the buffer tank 6 can buffer the accumulated heat and keep the temperature stable within the target range.

[0118] In order to maintain the hot-side outlet temperature of the evaporator 22 in the heat exchange circuit, i.e. the inlet temperature of the constant flow valve 25, due to fluctuations in ambient temperature and valve operation, the compressor 26 and the fan of the condenser 27 in the refrigeration circuit are continuously variable frequency speed control to ensure that the hot-side outlet temperature of the evaporator 22 is within the required range (T-5) ±0.5℃.

[0119] Through the regulation of the above system components and control devices, this system can ensure that the inlet temperature accuracy of load 9 is within T±0.05℃.

[0120] The cooling circuit of this invention controls the inner wall temperature of the cavity through the main circulation circuit and controls the outer wall temperature of the cavity through the bypass branch, thereby achieving separate control of the inner and outer wall temperatures of the accelerator cavity. This enables high-precision control of the accelerator cavity wall temperature, reduces manual intervention, and improves the stability of accelerator equipment operation.

[0121] The present invention provides a structure for the mixing tank 19, which is beneficial to the stability of the system, reduces the system's sensitivity to temperature difference, and can be applied to high-precision temperature control under conditions of small load, large flow rate and large temperature difference, ensuring the effectiveness of the present invention; the heat exchange circuit flow of the present invention is stable, which is beneficial to the temperature stability of the cooling circuit, and also reduces the number of start-stop cycles of the compressor 26 in the refrigeration circuit, effectively improving the service life of the compressor 26.

[0122] The cooling system of this invention responds quickly and automatically to changes in ambient temperature, saving the need for manual intervention and adjustment of previous equipment, reducing error rates and labor costs, and effectively reducing system maintenance costs. This, in turn, improves treatment efficiency and stability to a certain extent, enhances the product quality of the accelerator, ensures product consistency and reliability, and contributes to the rapid development of the accelerator equipment application industry.

[0123] Example 2:

[0124] Based on the high-precision temperature-controlled water cooling system described in Embodiment 1, this embodiment introduces a control method for the high-precision temperature-controlled water cooling system, including internal control and external control. The internal control is used to adjust the inner wall temperature of the cavity, and the external control is used to adjust the outer wall temperature of the cavity.

[0125] Specifically, the internal control includes:

[0126] According to the preset target value, the flow rate of the main circulation loop is adjusted by the first flow transmitter 10, and the flow rate of the bypass branch is adjusted by the second flow transmitter 32.

[0127] The inlet temperature of the three-way regulating valve 24 is controlled within the second range by the compressor 26 and the condenser 27, and the inlet temperature of the three-way regulating valve 24 is monitored by the sixth temperature transmitter 23.

[0128] The hot side inlet temperature of the plate heat exchanger 2 is controlled by the three-way regulating valve 24, thereby controlling the cold side outlet temperature of the plate heat exchanger 2. The cold side outlet temperature of the plate heat exchanger 2 is monitored by the first temperature transmitter 3, so that the cold side outlet temperature of the plate heat exchanger 2 is lower than the required temperature T.

[0129] The outlet temperature of the first electric heater 4 is controlled within a third range by the first electric heater 4, and the outlet temperature of the buffer water tank 6 is controlled within a fourth range by the buffer water tank 6, thereby controlling the inlet temperature of the load 9 within a first range. The inlet temperature of the load 9 is monitored by the third temperature transmitter 7, so that the inner wall temperature of the cavity is within a preset range, thus completing the internal control.

[0130] The power of the first electric heater 4 is calculated using the following formula:

[0131] ;

[0132] In the formula: The power of the first electric heater 4, The specific heat capacity of the liquid in the cooling circuit. The flow rate of the main circulation loop. T0 is the density of the liquid in the cooling circuit, T1 is the cold side outlet temperature of plate heat exchanger 2, and T1 is the set outlet temperature of the first electric heater 4.

[0133] In this process, a neural network-based PID controller is used to calculate the adjustment value of the power regulator for the first electric heater, ensuring that the power of the first electric heater is... .

[0134] The external control specifically includes:

[0135] When the inner wall temperature of the cavity is within a preset range, the front wall temperature of the load 9 is obtained through the first wall temperature transmitter 14, and the rear wall temperature of the load 9 is obtained through the second wall temperature transmitter 16.

[0136] Obtain the ambient temperature, and calculate the average temperature based on the front and rear wall temperatures of load 9;

[0137] The average temperature is compared with the preset range. If the average temperature is within the preset range, the operation ends; otherwise, both the ambient temperature and the average temperature are compared with the required temperature T, and the working status is adjusted according to the comparison results.

[0138] The adjustment of the working status based on the comparison results specifically includes:

[0139] If the average temperature is lower than the required temperature T, and the required temperature T is higher than the ambient temperature, then the power of the second electric heater 12 is calculated using the following formula:

[0140] ;

[0141] In the formula: The power of the second electric heater 12, To bypass the flow of the branch road, The average temperature. Ambient temperature;

[0142] Based on the average temperature, a neural network-controlled PID controller is used to control the fan on the finned tube heat exchanger 8, so that the outer wall temperature of the cavity is within a preset range.

[0143] If the average temperature is lower than the required temperature T, and the required temperature T is not greater than the ambient temperature, then the power of the second electric heater 12 is calculated using the following formula:

[0144] ;

[0145] Based on the average temperature, a neural network-controlled PID controller is used to control the fan on the finned tube heat exchanger 8, so that the outer wall temperature of the cavity is within a preset range.

[0146] If the average temperature is not less than the required temperature T, and the required temperature T is not greater than the ambient temperature, then the cold side outlet temperature of plate heat exchanger 2 is controlled by the following formula:

[0147] Front-end plate heat exchanger 2 outlet temperature ≤ ;

[0148] Based on the average temperature, a neural network-controlled PID controller is used to control the fan on the finned tube heat exchanger 8, so that the outer wall temperature of the cavity is within a preset range.

[0149] If the average temperature is not less than the required temperature T, and the required temperature T is greater than the ambient temperature, then the cold side outlet temperature of plate heat exchanger 2 is controlled by the following formula:

[0150] Front-end plate heat exchanger 2 outlet temperature ≤ ;

[0151] Based on the average temperature, a neural network-controlled PID controller calculates the adjustment value of the fan on the finned tube heat exchanger, so that the outer wall temperature of the cavity is within a preset range.

[0152] like Figure 5 As shown, in this embodiment, the neural network control PID specifically includes:

[0153] The initial PID values ​​include the scaling factor. Integral factor and differential factors ;

[0154] Input feature values ​​include the current error Error change rate Cumulative error ;

[0155] The output PID increment target includes the proportional factor increment ΔKp, the integral factor increment ΔKi, and the derivative factor increment ΔKd;

[0156] make To control and adjust the amount of change;

[0157] Let the sampling period be set to Δt;

[0158] Set the target temperature to T_actual, collect the current temperature T_actual, and T_set is the set target temperature;

[0159] Calculation error = T_set - T_actual;

[0160] Error change rate Where k represents the error of the kth iteration; This represents the calculation error for the (k-1)th term;

[0161] The historical error over a certain time period t is taken as the cumulative error. , where i is the error number not greater than k;

[0162] Let k1 and k2 be the minimum and maximum values ​​of the allowable error range for the target temperature, respectively. After normalization, with the input normalized to [k1, k2], the maximum error range is k2 - k1. The specific expression is as follows:

[0163] Current error normalization: ;in, This is the current error after normalization;

[0164] Error rate of change normalization: ;in, This is the normalized rate of change of error;

[0165] Cumulative error normalization: ;in, This is the normalized cumulative error;

[0166] Determine the parameters of hidden layer neurons:

[0167] ;

[0168] ;

[0169] Where: A1, A2, A3, B1, B2, B3, C1, C2, D1, D2, E1, E2 are neuron weight parameters; W1, W2 represent neuron weight matrices in the neural network;

[0170] Activating computation using the Tanh function of a neural network:

[0171] ;

[0172] ;

[0173] H1 and H2 represent the nonlinear transformation results of the neurons on the input features;

[0174] Calculate the changes in each PID parameter: proportional factor increment ΔKp, integral factor increment ΔKi, derivative factor increment ΔKd:

[0175] ;

[0176] ;

[0177] ;

[0178] The adjusted PID includes the adjusted scaling factor. Adjusted integration factor and adjusted differential factors ,as follows:

[0179] ;

[0180] ;

[0181] ;

[0182] The control adjustment change is generated as follows:

[0183] ;

[0184] The adjustment value is determined based on the change in control, where the adjustment value includes adjusting the angle and frequency output of heating or cooling.

[0185] Specifically, the required cavity wall temperature for the accelerator is T±0.1. The accelerator generates a certain amount of heat; the internal cavity wall temperature is mainly maintained by the coolant inlet water temperature, while the external cavity wall temperature is primarily affected by natural convection from the outdoor environment. Therefore, to ensure the accelerator cavity wall temperature remains stable within the required range, it is necessary to consider not only coolant temperature control but also natural heat exchange caused by the indoor environment. Thus, the main control method involves high-precision control of the coolant temperature entering the load 9 through the main circulating water circuit, combined with heat exchange between the external finned tube heat exchanger 8 and the accelerator's outer wall to maintain the required internal and external cavity wall temperature at T±0.1. The main control methods are as follows:

[0186] S1: After starting the equipment, adjust the flow rate of the main circulation loop according to the first flow transmitter 10, and adjust the bypass branch according to the second flow transmitter 32. Set the relevant target value in the control device. The high-precision control of the coolant temperature at the load 9 in the main circulation water circuit needs to be within T±0.05℃, i.e. the preset range. This temperature is monitored by the third temperature transmitter 7.

[0187] S2: The temperature at the inlet of the three-way regulating valve 24 monitored by the sixth temperature transmitter 23 is maintained by adjusting the refrigeration circuit. The temperature control accuracy is within (T-5) ±0.5℃, that is, within the second range. The temperature here is controlled by the stepless frequency conversion control of the compressor 26 and the fan of the condenser 27, so that the temperature monitored by the sixth temperature transmitter 23 is always within the temperature control accuracy.

[0188] S3: The cold side outlet temperature T0 of the plate heat exchanger 2 monitored by the first temperature transmitter 3 is set to be slightly lower than T. The required temperature of T0 is set to T-0.1℃. This is mainly controlled by controlling the angle of the three-way regulating valve 24 in the heat exchange circuit. When the temperature of T0 gradually decreases, the angle decreases, reducing the amount of water flowing into the hot side inlet of the plate heat exchanger 2 and preventing it from changing to a lower temperature. Conversely, the angle increases, preventing it from changing to a higher temperature. The control device uses a neural network to control the PID to adjust the opening of the three-way regulating valve 24 so that T0 is stabilized at the set temperature with minimal deviation.

[0189] S4: The second temperature transmitter 5, which monitors the outlet temperature of the first electric heater 4, is set to a target temperature of T1. The temperature of the coolant entering the first electric heater 4 is T-0.1℃. To achieve T, the following formula is used: The required power is calculated, and the power output of the heater is adjusted by PID control to reach T±0.07℃, which is the third range. Then, through the buffering effect of the buffer water tank 6, the water temperature fluctuation is further reduced so that the coolant temperature at the load 9 meets T±0.05℃, which is the fourth range, thereby controlling the inner wall temperature of the cavity to meet T±0.1℃.

[0190] S5: When the inner wall temperature meets the requirements, if the outer wall temperature is lower or higher than the required value, heat transfer will occur, resulting in the temperature exceeding the required range; the outer wall temperature is calculated based on the data fed back by the first wall temperature transmitter 14 and the second wall temperature transmitter 16 used to monitor the front and rear wall temperatures of load 9, and the average temperature is calculated based on the front and rear wall temperatures.

[0191] The average temperature is compared with the preset range. If the average temperature is within the preset range, the operation ends; otherwise, both the ambient temperature and the average temperature are compared with the required temperature T, and the working status is adjusted according to the comparison results.

[0192] If the average temperature is lower than the required temperature T, and the required temperature T is higher than the ambient temperature, then the power of the second electric heater 12 is calculated using the following formula:

[0193] ;

[0194] In the formula: The power of the second electric heater 12, To bypass the flow of the branch road, The average temperature. Ambient temperature;

[0195] Based on the average temperature, with the outer wall temperature T as the target, the adjustment value of the fan on the finned tube heat exchanger 8 is calculated by neural network control PID, so that the outer wall temperature reaches T±0.1℃.

[0196] If the average temperature is lower than the required temperature T, and the required temperature T is not greater than the ambient temperature, then the power of the second electric heater 12 is calculated using the following formula:

[0197] ;

[0198] Based on the average temperature, with the outer wall temperature T as the target, the adjustment value of the fan on the finned tube heat exchanger 8 is calculated by neural network control PID, so that the outer wall temperature reaches T±0.1℃.

[0199] If the average temperature is not less than the required temperature T, and the required temperature T is not greater than the ambient temperature, then the cold side outlet temperature of plate heat exchanger 2 is controlled by the following formula:

[0200] Front-end plate heat exchanger 2 outlet temperature ≤ ;

[0201] Based on the average temperature, with the outer wall temperature T as the target, the adjustment value of the fan on the finned tube heat exchanger 8 is calculated by neural network control PID, so that the outer wall temperature reaches T±0.1℃.

[0202] If the average temperature is not less than the required temperature T, and the required temperature T is greater than the ambient temperature, then the cold side outlet temperature of plate heat exchanger 2 is controlled by the following formula:

[0203] Front-end plate heat exchanger 2 outlet temperature ≤ ;

[0204] Based on the average temperature, with the outer wall temperature T as the target, a neural network control PID is used to calculate the adjustment value of the fan on the finned tube heat exchanger 8, so that the outer wall temperature reaches T±0.1℃.

[0205] The method of this invention combines neural network control PID logic, and achieves high-precision control of the accelerator cavity wall temperature by separately controlling the temperature of the inner and outer cavity walls of the accelerator. The temperature control accuracy can reach T±0.1℃. At the same time, it stabilizes the flow rate of the heat exchange circuit, which is beneficial to the temperature stability of the cooling circuit. It also reduces the number of start-stop cycles of the compressor 26 in the refrigeration circuit, effectively improving the service life of the compressor 26. Meanwhile, no manual intervention is required, ensuring the working efficiency of this invention.

[0206] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code, including but not limited to disk storage, CD-ROM, optical storage, etc.

[0207] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus systems, and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0208] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0209] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0210] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A temperature-controlled water cooling system, characterized by, The cooling circuit, the heat exchange circuit and the refrigeration circuit are included. The cooling circuit includes a main circulation loop and a bypass branch, the main circulation loop includes a first pump, and cooling liquid output by the first pump is used to flow through a cold side inlet of a plate heat exchanger and a cold side outlet of the plate heat exchanger in sequence, and part of the cooling liquid output by the cold side outlet of the plate heat exchanger is used to flow through a first electric heater, a buffer water tank, a load and a mixing water tank in sequence and then flow back into the first pump. The remaining part of the cooling liquid output by the cold side outlet of the plate heat exchanger is used to flow through the bypass branch and the mixing water tank in sequence and then flow back into the first pump. The mixing water tank is used to mix the cooling liquid output by the load and the cooling liquid output by the bypass branch, and output the mixed cooling liquid to the first pump. The load is located in a cavity, the main circulation loop is used to adjust the temperature of the inner wall of the cavity, and the bypass branch is used to adjust the temperature of the outer wall of the cavity. The heat exchange circuit includes a second pump, and cooling liquid output by the second pump is used to flow through a hot side inlet of an evaporator, a hot side outlet of the evaporator, a constant flow valve, a three-way regulating valve, a hot side inlet of the plate heat exchanger and a hot side outlet of the plate heat exchanger in sequence and then flow back into the second pump, and the three-way regulating valve is connected with the second pump. The refrigeration circuit includes a compressor, and cooling liquid output by the compressor is used to flow through a condenser, a dry filter, an expansion valve, a cold side inlet of the evaporator and a cold side outlet of the evaporator in sequence and then flow back into the compressor. The bypass branch includes a second flow transmitter, a finned tube heat exchanger, a regulating valve and an ion tank connected in sequence, the second flow transmitter is connected with the cold side outlet of the plate heat exchanger, the ion tank is connected with the mixing water tank, and a fan is arranged on the outer wall of the finned tube heat exchanger on one side of the cavity. The bypass branch further includes a second electric heater, and the second flow transmitter is connected with the cold side outlet of the plate heat exchanger through the second electric heater.

2. The temperature-controlled water cooling system of claim 1, wherein, The cooling circuit further includes a first temperature transmitter for monitoring the temperature of the cold side outlet of the plate heat exchanger, a second temperature transmitter for monitoring the temperature of the outlet of the first electric heater, a third temperature transmitter for monitoring the temperature of the inlet of the load, an environmental temperature transmitter for monitoring the environmental temperature of the inlet of the finned tube heat exchanger, a first wall temperature transmitter for monitoring the temperature of the front end wall of the load, a second wall temperature transmitter for monitoring the temperature of the tail end wall of the load, a fifth temperature transmitter for monitoring the temperature of the outlet of the load, a first flow transmitter for monitoring the flow of the load, an electric conductivity transmitter for monitoring the electric conductivity of the load, and a pressure transmitter for monitoring the inlet pressure of the first pump, and the load is connected with the first flow transmitter through a main circulation loop regulating valve. The bypass branch further includes a fourth temperature transmitter for monitoring the temperature of the outlet of the second electric heater.

3. The temperature-controlled water cooling system of claim 2, wherein, The heat exchange circuit further includes a sixth temperature transmitter for monitoring the temperature of the inlet of the three-way regulating valve. The bypass branch further includes a fourth temperature transmitter for monitoring the temperature of the outlet of the second electric heater. The refrigeration circuit further comprises a seventh temperature transmitter for monitoring the evaporator cold side outlet temperature, and a compressor inlet pressure transmitter for monitoring the compressor inlet pressure.

4. The temperature-controlled water cooling system of claim 3, wherein, The first electric heater and the second electric heater are configured with power regulators; and the fan is a variable frequency fan.

5. The temperature-controlled water cooling system of claim 1, wherein, The water mixing box is provided with a first opening, a second opening and a mixing outlet, the first opening is connected with the ion tank, the second opening is connected with the load, and the mixing outlet is connected with the first pump, the water mixing box is provided with a first flow distribution plate in communication with the first opening, the water mixing box is provided with a second flow distribution plate on one side of the first flow distribution plate, the second flow distribution plate is in communication with the second opening, a plurality of flow distribution holes are formed in the first flow distribution plate and the second flow distribution plate, and a plurality of baffles are arranged on the inner wall of the water mixing box in a staggered manner.

6. A control method of a temperature-controlled water cooling system based on the temperature-controlled water cooling system according to claim 4, characterized by, The internal control is used for adjusting the inner wall temperature of the cavity, and the external control is used for adjusting the outer wall temperature of the cavity. The internal control specifically comprises: According to the preset target value, the flow of the main circulation loop is adjusted by the first flow transmitter, and the flow of the bypass branch is adjusted by the second flow transmitter; The inlet temperature of the three-way regulating valve is controlled in the second range by the compressor and the condenser, and the inlet temperature of the three-way regulating valve is monitored by the sixth temperature transmitter; The inlet temperature of the heat side of the plate heat exchanger is controlled by the three-way regulating valve, so that the outlet temperature of the cold side of the plate heat exchanger is controlled, and the outlet temperature of the cold side of the plate heat exchanger is monitored by the first temperature transmitter, so that the outlet temperature of the cold side of the plate heat exchanger is lower than the required temperature T; The first electric heater is controlled to control the outlet temperature of the first electric heater in the third range, the outlet temperature of the buffer water tank is controlled in the fourth range by the buffer water tank, so that the inlet water temperature of the load is controlled in the first range, and the inlet water temperature of the load is monitored by the third temperature transmitter, so that the inner wall temperature of the cavity is in the preset range, and the internal control is completed. The power of the first electric heater is calculated by the following formula: ； wherein: P0is the power of the first electric heater, Cp is the specific heat capacity of the liquid in the cooling circuit, Q0is the flow rate of the main circulation circuit, p is the density of the liquid in the cooling circuit, T0is the plate heat exchanger cold side outlet temperature, T1is the first electric heater outlet set temperature; Wherein, the neural network control PID is used to calculate the adjusting value of the power regulator of the first electric heater, so that the power of the first electric heater is .

7. The control method of the temperature-controlled water cooling system according to claim 6, wherein The external control specifically comprises: When the inner wall temperature of the cavity is in the preset range, the front end wall temperature of the load is obtained by the first wall temperature transmitter, and the tail end wall temperature of the load is obtained by the second wall temperature transmitter. The average temperature is calculated according to the front end wall temperature and the tail end wall temperature of the load; The average temperature is compared with the preset range, if the average temperature is in the preset range, the work is finished, otherwise, the environment temperature and the average temperature are compared with the required temperature T, and the working state is adjusted according to the comparison result; The working state is adjusted according to the comparison result, specifically comprising: If the average temperature is less than the required temperature T, and the required temperature T is greater than the environment temperature, the power of the second electric heater is calculated by the following formula: ； wherein: P2is the power of the second electric heater, Qb is the flow rate of the bypass branch, T is the average temperature, T is the ambient temperature; According to the average temperature, the fan on the finned tube heat exchanger is controlled by using neural network control PID, so that the outer wall temperature of the cavity is in the preset range; If the average temperature is less than the required temperature T, and the required temperature T is not greater than the environment temperature, the power of the second electric heater is calculated by the following formula: ； According to the average temperature, the fan on the finned tube heat exchanger is controlled by a neural network control PID, so that the outer wall temperature of the cavity is within a preset range; If the average temperature is not less than the demand temperature T, and the demand temperature T is not greater than the environment temperature, then the cold side outlet temperature of the plate heat exchanger is controlled as follows: Front end plate heat exchanger outlet temperature ≤ ; According to the average temperature, the fan on the finned tube heat exchanger is controlled by a neural network control PID, so that the outer wall temperature of the cavity is within a preset range; If the average temperature is not less than the demand temperature T, and the demand temperature T is not greater than the environment temperature, then the cold side outlet temperature of the plate heat exchanger is controlled as follows: Front end plate heat exchanger outlet temperature ≤ ; According to the average temperature, the fan on the finned tube heat exchanger is controlled by a neural network control PID, so that the outer wall temperature of the cavity is within a preset range.

8. The control method of the temperature-controlled water cooling system according to claim 7, wherein The neural network control PID specifically includes: The initial PID values include a proportional factor , an integral factor , and a differential factor ; input feature values include current error , error change rate , accumulated error ; The output PID increment target includes a proportional factor increment ΔKp, an integral factor increment ΔKi, and a differential factor increment ΔKd; Let to control the adjustment of the variation; Let the sampling period be set as Δt; Set the current temperature as T_actual, collect the current temperature T_actual, and T_set as the set target temperature; Computing error = T_set - T_actual; rate of change of error where k represents the kth error; is the calculated error for k-1. taking the history error of a certain time period t as the cumulative error where i is the error number not greater than k. Set k1 and k2 as small and large values of the target temperature allowable error range, perform normalization processing, set the input normalization to [k1, k2], and the maximum error range is k2-k1, and the specific expression is as follows: Current error normalization: ; wherein, is the normalized current error; Error change rate normalization: ; wherein, is the normalized error change rate; Cumulative error normalization: ; wherein, is the normalized cumulative error; Determine the hidden layer neuron parameters: ； ； Wherein: A1, A2, A3, B1, B2, B3, C1, C2, D1, D2, E1, E2 are neuron weight parameters; W1, W2 represent the neuron weight matrix in the neural network; The neural network activation Tanh function is used to activate the calculation: ； ； H1 and H2 represent the nonlinear transformation results of the input features by the neurons; Calculate the change amount of each parameter of the PID: proportional factor increment ΔKp, integral factor increment ΔKi, and differential factor increment ΔKd: ； ； ； The adjusted PID comprises an adjusted proportional factor , an adjusted integral factor , and an adjusted derivative factor as follows: ； ； ； Then the control adjustment change amount is generated as: ； According to the control adjustment change amount, the adjustment value is determined.

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