Control method and control system of water-cooled air conditioning unit and water-cooled air conditioning unit

Abstract

The invention discloses a control method and system of a water-cooled air conditioning unit and the water-cooled air conditioning unit, and belongs to the field of data center machine rooms. The control method of the water-cooled air conditioning unit comprises the steps that the detection temperature value of a surface air cooler is obtained; determining a first PID result through a PID control algorithm according to the detection temperature value and a target temperature value; determining a target opening degree of a flow regulating valve according to the first PID result; determining a target water flow value of the flow regulating valve according to the target opening degree of the flow regulating valve; determining a second PID result through a PID control algorithm according to the target water flow value of the flow regulating valve and the current water flow value detected by the flow sensor; and determining and adjusting the execution opening degree of the flow adjusting valve according to the second PID result. According to the invention, the large temperature change of the machine room caused by the fluctuation of the water flow can be avoided, the air temperature in the machine room can be better maintained, and the user experience is improved.

Description

Technical Field

[0001] The present application belongs to the field of data center computer rooms, and in particular, relates to a control method, a control system and a water-cooled air-conditioning unit. Background Art

[0002] In existing water-cooled air conditioning units, chilled water is pressurized by a refrigeration pump and sent into a chilled water pipeline. After the chilled water flows through the surface cooler, it exchanges heat with the outside air through the heat exchange side of the surface cooler to control the temperature of the outside air.

[0003] In the process of controlling temperature, a control algorithm that can eliminate deviations is usually used, such as the Proportional Integral Differential (PID) control algorithm. PID calculation is performed based on the deviation between the actual temperature of the unit and the target temperature value, and the water valve opening is controlled by the size of the calculated output PID value.

[0004] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems:

[0005] When the water flow fluctuates frequently due to factors such as changes in the unit's chilled water pipeline pressure, the water valve opening controlled by the temperature PID responds relatively slowly, causing a room temperature that has reached a steady state to fluctuate or a relatively stable water valve opening to frequently operate, resulting in poor air temperature maintenance in the room and a poor user experience. Summary of the invention

[0006] The present application aims to at least solve the problem in the prior art that when the water flow rate fluctuates frequently due to factors such as changes in the unit's chilled water pipeline pressure, the water valve opening response controlled by the temperature PID is relatively delayed, resulting in fluctuations in a steady-state machine room temperature or frequent movements of a relatively stable water valve opening.

[0007] In a first aspect, the present application provides a control method for a water-cooled air-conditioning unit, comprising:

[0008] Get the detected temperature value of the surface cooler;

[0009] Determine a first PID result through a PID control algorithm according to the detected temperature value and the target temperature value;

[0010] Determine the target opening of the flow control valve according to the first PID result;

[0011] Determining a target water flow value of the flow regulating valve according to a target opening of the flow regulating valve;

[0012] Determine a second PID result through a PID control algorithm according to the target water flow value of the flow regulating valve and the current water flow value detected by the flow sensor;

[0013] The execution opening degree of the flow control valve is determined and adjusted according to the second PID result.

[0014] According to one embodiment of the present application, the first PID result and the second PID result are calculated using a discrete formula of a PID position algorithm.

[0015] According to one embodiment of the present application, the first PID result is calculated using the following formula:

[0016]

[0017] Where: u(k) represents the output control value; e(k) represents the difference between the target temperature value set by the user and the current temperature value detected by the temperature sensor; K P Coefficient of proportionality; K I Indicates the coefficient of integration; K D represents the coefficient of differentiation; ∑e(i) represents the accumulation of errors; e(k)-e(k-1) represents the current error minus the last error;

[0018] The second PID result is calculated using the following formula:

[0019]

[0020] Where: u(k) represents the output control quantity; e(k) represents the difference between the target water flow rate and the current water flow rate detected by the flow sensor; K P Coefficient of proportionality; K I Indicates the coefficient of integration; K D represents the coefficient of differentiation; ∑e(i) represents the accumulation of errors; e(k)-e(k-1) represents the current error minus the last error.

[0021] According to one embodiment of the present application, a minimum value and a maximum value of the first PID result and the second PID result are set;

[0022] If the result calculated by the PID control algorithm is greater than the maximum value, the first PID result and the second PID result take the maximum value;

[0023] If the result calculated by the PID control algorithm is less than the minimum value, the first PID result and the second PID result take the minimum value.

[0024] According to an embodiment of the present application, the target opening and the execution opening are obtained according to the corresponding relationship between the opening of the flow control valve and the water flow, and the first PID result and the second PID result correspond to the opening of the flow control valve of 0% to 100%.

[0025] In a second aspect, the present application also proposes a control system for a water-cooled air-conditioning unit, comprising:

[0026] A flow regulating valve is connected to the pipes in and out of the surface cooler and controls the water flow in and out of the surface cooler;

[0027] A temperature sensor is used to sense the ambient temperature of the surface cooler to obtain a detection temperature value;

[0028] A flow sensor is used to collect the water flow through the surface cooler to obtain the current water flow;

[0029] A controller is signal-connected to the flow control valve, the temperature sensor and the flow sensor, and adjusts the execution opening of the flow control valve according to any of the flow control methods described above.

[0030] According to one embodiment of the present application, the temperature sensor includes a first temperature sensor and a second temperature sensor; the first temperature sensor is arranged on the air inlet side of the condenser to detect the current temperature value of the airflow on the air inlet side; the second temperature sensor is arranged on the air outlet side of the condenser to detect the current temperature value of the airflow on the air outlet side.

[0031] According to one embodiment of the present application, the flow regulating valve is an electric two-way valve.

[0032] In a third aspect, the present application further proposes a water-cooled air-conditioning unit, comprising a surface cooler and a control system as described in any one of the above items, wherein the surface cooler is connected to a main water inlet pipeline and a main water outlet pipeline.

[0033] According to an embodiment of the present application, the flow regulating valve is arranged on the main water outlet pipeline; the flow sensor is arranged on the main water inlet pipeline or the main water outlet pipeline.

[0034] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0035] The present application first calculates the preliminary opening of the flow control valve based on the current temperature value and the target temperature value, but does not act on the output; then, based on the preliminary opening of the flow control valve, the preliminary opening is converted into the corresponding target water flow, and a second correction calculation is performed based on the target water flow value and the current water flow value, and the result is applied to the output.

[0036] This application performs two PID calculations and outputs a final result. It can reduce the over-adjustment of the water valve opening due to temperature PID control in the related technology, resulting in large peaks or multiple oscillations in the computer room temperature. It can avoid large changes in the computer room temperature due to fluctuations in water flow, so as to better maintain the air temperature in the computer room and improve the user experience.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 A structural block diagram of a control system for a water-cooled air-conditioning unit provided in one embodiment of the present application;

[0040] Figure 2 This is a schematic diagram of the piping structure of a water-cooled air-conditioning unit provided in one embodiment of the present application;

[0041] Figure 3 It is a flow chart of a control method of a water-cooled air-conditioning unit provided in one embodiment of the present application;

[0042] Figure 4 This is the relationship diagram between the opening of the flow control valve and the water flow rate.

[0043] Reference numerals:

[0044] Surface cooler 100, flow regulating valve 200, temperature sensor 300, flow sensor 400, controller 500;

[0045] 11. Main water inlet pipeline; 12. Main water outlet pipeline;

[0046] 20. Branch pipeline; 21. Water inlet branch pipe; 22. Water outlet branch pipe;

[0047] 30. Heat exchange coil;

[0048] 51. first pipeline; 511. first connection structure; 52. second pipeline;

[0049] 61. Flow control valve; 62. First stop valve; 63. Water filter; 64. Drain valve; 65. Second stop valve. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0051] Water-cooled air conditioning units are installed in the computer room to control the air temperature in the computer room.

[0052] In a water-cooled air-conditioning unit, chilled water is pressurized by a refrigeration pump and sent into the chilled water pipeline. After the chilled water flows through the surface cooler, it exchanges heat with the outside air through the heat exchange side of the surface cooler to regulate the temperature of the outside air.

[0053] In the process of controlling temperature, a control algorithm that can eliminate deviations is usually used, such as the Proportional Integral Differential (PID) control algorithm. PID calculation is performed based on the deviation between the actual temperature of the unit and the target temperature value, and the water valve opening is controlled by the size of the calculated output PID value.

[0054] In some cases, external factors may cause the water flow of the unit to fluctuate. For example, the water pump of the unit may have unstable pressure due to various reasons (such as load changes or failures). The fluctuation of the water pump pressure will directly affect the water flow fluctuation of the unit.

[0055] The water flow of the unit fluctuates, and the water valve opening controlled by the temperature PID responds relatively slowly, resulting in temperature fluctuations in a computer room that has reached a steady state or frequent movements of a relatively stable water valve opening. The air temperature in the computer room is poorly maintained, resulting in a poor user experience.

[0056] In the following, in combination with the accompanying drawings, the control method, control system and water-cooled air-conditioning unit provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0057] like Figure 1 As shown, it is a structural block diagram of a water-cooled air-conditioning unit control system according to an embodiment of the present application, wherein double solid lines represent pipeline connections, single solid lines represent signal connections, and dotted lines represent induction relationships.

[0058] The water-cooled air-conditioning unit control system includes: a flow regulating valve 200 , a temperature sensor 300 , a flow sensor 400 and a controller 500 .

[0059] The flow regulating valve 200 is connected to the pipelines entering and exiting the condenser 100, and is used to control the water flow entering / flowing out of the condenser 100; the temperature sensor 300 is used to sense the ambient temperature of the condenser 100; the flow sensor 400 is used to collect the total water flow flowing through the internal pipeline of the water-cooled air-conditioning unit (the pipeline passing through the condenser 100); the flow regulating valve 200, the temperature sensor 300 and the flow sensor 400 are all connected to the controller 500, and the controller 500 receives the temperature signal detected by the temperature sensor 300 and the flow signal detected by the flow sensor 400, and controls the opening of the flow regulating valve 200 according to the temperature signal and the flow signal.

[0060] In some embodiments, the cooler 100 has an air inlet side and an air outlet side. The temperature sensor 300 may include: a first temperature sensor and a second temperature sensor; the first temperature sensor is disposed on the air inlet side of the cooler 100, and the current temperature value detected by the first temperature sensor is the temperature value of the airflow flowing into the air inlet side; the second temperature sensor is disposed on the air outlet side of the cooler 100, and the current temperature value detected by the second temperature sensor is the temperature value of the airflow flowing out of the air outlet side.

[0061] Please refer to Figure 2 , which is a schematic diagram of the pipeline structure of a water-cooled air-conditioning unit. The water-cooled air-conditioning unit includes a main water inlet pipeline 11, a branch pipeline 20, a main water outlet pipeline 12 and a heat exchange coil 30 (a part of the surface cooler 100), and a flow regulating valve 200 is connected to the main water outlet pipeline 12. In the illustrated embodiment, the flow regulating valve 200 is an electric two-way valve.

[0062] The main water inlet pipeline 11 is correspondingly connected to the starting end of the branch pipeline 20 , and the end of the branch pipeline 20 is correspondingly connected to the main water outlet pipeline 12 .

[0063] In actual implementation, there can be multiple branch pipelines 20, and the starting end of each branch pipeline 20 can be connected to the main water outlet pipeline 12 through a branch pipe, and the end of each branch pipeline 20 can be connected to the main water outlet pipeline 12 through a branch pipe. Of course, the number of branch pipelines 20 can also be only one, and this embodiment does not limit it.

[0064] A flow sensor 400 is provided on the main water inlet pipe 11 or the main water outlet pipe 12. The flow sensor 400 is used to monitor the water flow flowing through the main water inlet pipe 11, the main water outlet pipe 12, and the water flow flowing through the unit.

[0065] The heat exchange coil 30 is correspondingly arranged on the branch pipeline 20 . If there are multiple branch pipelines 20 , a heat exchange coil 30 is correspondingly installed on each branch pipeline 20 .

[0066] In actual implementation, the branch pipeline 20 includes an inlet branch pipe 21 and an outlet branch pipe 22. The starting ends of the inlet branch pipe 21 and the outlet branch pipe 22 are connected to the main outlet pipeline 12 through a branch pipe; the end of the inlet branch pipe 21 is connected to the water inlet of the heat exchange coil 30, and the end of the outlet branch pipe 22 is connected to the water outlet of the heat exchange coil 30.

[0067] A temperature sensor 300 is provided on the heat exchange side of the heat exchange coil 30 to obtain the current ambient temperature in real time.

[0068] In actual implementation, the surface cooler 100 has an air inlet side and an air outlet side, a gas flow channel is formed between the air inlet side and the air outlet side, and a heat exchange coil 30 is arranged in the gas flow channel.

[0069] The flow regulating valve 200 is disposed on the main water outlet pipeline 12 .

[0070] like Figure 2 As shown, in some embodiments, the main water inlet pipeline 11 and the main water outlet pipeline 12 both include a first pipeline 51 and a second pipeline 52 that are interconnected.

[0071] It should be noted that the left side of the first connection structure 511 is a dotted line, which is the first pipeline 51, and the first pipeline 51 can be an external pipeline of the water-cooled air-conditioning unit; the right side of the first connection structure 511 is a solid line, which is the internal pipeline of the water-cooled air-conditioning unit.

[0072] The front section of the second pipeline 52 is provided with a first connection structure 511, which is suitable for communicating with one end of the first pipeline 51 through the first connection structure 511. The end of the second pipeline 52 of the main water inlet pipeline 11 is correspondingly communicated with the starting end of the branch pipeline 20; the end of the second pipeline 52 of the main water outlet pipeline 12 is correspondingly communicated with the end of the branch pipeline 20.

[0073] In this embodiment, the end of the first pipeline 51 is detachably connected to the first connecting structure 511, and the first connecting structure 511 is detachably connected to the second connecting structure at the starting end of the second pipeline 52, thereby improving the expandability of the main water inlet pipeline 11 and the main water outlet pipeline 12 when connected to the external pipeline.

[0074] In actual implementation, the first connection structure 511 may be a soft interface, and the second connection structure may be a threaded interface or a flange interface.

[0075] like Figure 2 As shown, in some embodiments, the flow control system of the water-cooled air-conditioning unit also includes: a flow control valve 61 and a first stop valve 62; the flow control valve 61 and the first stop valve 62 are both installed in the main water inlet pipeline 11, and the first stop valve 62 is downstream of the flow control valve 61.

[0076] In this embodiment, when the flow control valve 61 is closed, it is convenient to maintain the first stop valve 62 and the flow regulating valve 200. The flow control valve 61 includes a balancing valve or an isolation valve.

[0077] In actual implementation, a water filter 63 may be further installed in the main water inlet pipeline 11 . The water filter 63 is disposed between the flow control valve 61 and the first stop valve 62 to filter the chilled water flowing through the main water inlet pipeline 11 .

[0078] like Figure 2 As shown, in some embodiments, the flow control system of the water-cooled air conditioning unit further includes: a drain valve 64;

[0079] The drain valve 64 is installed in the main water outlet pipeline 12 and is located at the bottom of the main water outlet pipeline 12 . The drain valve 64 is located downstream of the flow regulating valve 200 .

[0080] In this embodiment, since water flows downward, the drain valve 64 is placed at the bottom of the main water outlet pipe 12 to completely drain the residual water in the unit. This not only facilitates daily maintenance, but also provides convenience for the shipment and transportation of the unit, avoiding the freezing problem caused by residual water, thereby effectively extending the service life.

[0081] like Figure 2 As shown, in some embodiments, the flow control system of the water-cooled air-conditioning unit further includes: a second stop valve 65 ; the second stop valve 65 is installed in the main water outlet pipeline 12 , and the second stop valve 65 is downstream of the drain valve 64 .

[0082] In this embodiment, the second stop valve 65 is completely closed during the drainage process of the drain valve 64 to ensure that the water in the main water outlet pipe 12 is only discharged from the drain valve 64, so as to ensure that the drainage process is more efficient and thorough.

[0083] like Figure 3 As shown, the present application also provides a control method for a water-cooled air-conditioning unit control system, wherein the controller 500 is electrically connected to the flow regulating valve 200, the flow sensor 400 and the temperature sensor 300, and is configured to determine a first PID result according to a current temperature value and a target temperature value detected by the temperature sensor 300, and to determine a second PID result according to a target water flow value of the flow regulating valve 200 and a current water flow value detected by the flow sensor 400.

[0084] The first PID result can be calculated using the following discrete formula of the PID position algorithm:

[0085]

[0086] in:

[0087] u(k) represents the control quantity output by the controller;

[0088] e(k), represents the target temperature value set by the user minus the current temperature value detected by the temperature sensor;

[0089] K P , which represents the coefficient of proportion;

[0090] K I , represents the coefficient of integration;

[0091] K D , represents the coefficient of differentiation;

[0092] ∑e(i), represents the accumulation of errors, corresponding to the integral;

[0093] e(k)-e(k-1) means current error minus last error, corresponding to differential.

[0094] The target opening degree of the flow control valve 200 is determined according to the first PID result.

[0095] It should be noted that, due to the influence of the difference between the current temperature value and the target temperature value, and the length of the integration and differentiation time, the value of u(k) calculated may be large, so the first PID result needs to be limited in range. There is a corresponding relationship between the range of the first PID result and the target opening range of the flow control valve 200. For example, the range of the first PID result is limited to [-200, 200]. If the calculated u(k) exceeds the upper or lower limit, it is corrected to the upper limit boundary value (200) or the lower limit boundary value (-200). The first PID result of 0 to 200 corresponds to the opening of the flow control valve 200 of 0% to 100%.

[0096] The target water flow value of the flow control valve 200 is determined according to the current error target opening of the flow control valve 200 .

[0097] It should be noted that the technical manual of the flow control valve 200 or the data sheet provided by the manufacturer can be consulted. The technical manual or data sheet will give the flow characteristics of the flow control valve 200 at different openings. For example, when the pressure difference between the two ends of the valve of valve model VH58EM30065 is 100 kPa, the rated flow rate of the fully open (100%) is 50m 3 / h.

[0098] like Figure 4 As shown, in this embodiment, the target opening of the flow control valve 200 is converted into a target water flow rate through the corresponding relationship between the target opening of the flow control valve 200 and the maximum water flow rate through which the flow control valve 200 can pass.

[0099] The second PID result is determined according to the target water flow value of the flow regulating valve 200 and the current water flow value detected by the flow sensor 400 .

[0100] The second PID result can be calculated using the following discrete formula of the PID position algorithm:

[0101]

[0102] Among them, except for e(k), which has a different meaning and represents the target water flow rate-the current water flow rate detected by the flow sensor, u(k), K P , K I , K D The meanings of , ∑e(i), e(k)-e(k-1) are the same as in the calculation formula of the first PID result.

[0103] The execution opening degree of the flow control valve 200 is determined according to the second PID result.

[0104] Similarly, there is a corresponding relationship between the second PID result range and the opening range of the flow control valve 200. For example, the second PID result range is [-200, 200], where the second PID result of 0 to 200 corresponds to the opening of the flow control valve 200 of 0% to 100%, and the execution opening of the flow control valve 200 is determined and controlled accordingly.

[0105] In summary, the present application first calculates the preliminary opening of the flow control valve 200 based on the current temperature value and the target temperature value, but does not act on the output of the controller 500; then, based on the preliminary opening of the flow control valve 200, the preliminary opening is converted into a corresponding target water flow, and a second correction calculation is performed based on the target water flow value and the current water flow value, and the result is applied to the controller 500 output as the execution opening for adjusting the flow control valve 200.

[0106] The control method of the water-cooled air-conditioning unit control system of the present application performs two PID calculations and outputs a final result. It can reduce the phenomenon in the related technology that the water valve opening is over-adjusted due to temperature PID control, resulting in large peaks or multiple oscillations in the computer room temperature. It can avoid large changes in the computer room temperature due to fluctuations in water flow, so as to better maintain the air temperature in the computer room and improve the user experience.

[0107] The control method of the water-cooled air-conditioning unit of the present application can be applied to a terminal, and can be specifically executed by hardware or software in the terminal.

[0108] The terminal includes, but is not limited to, a portable communication device such as a mobile phone or tablet computer with a touch-sensitive surface (e.g., a touch screen display and / or a touch pad). It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer with a touch-sensitive surface (e.g., a touch screen display and / or a touch pad).

[0109] The control method of a water-cooled air-conditioning unit provided in an embodiment of the present application, the execution subject of the control method of the water-cooled air-conditioning unit may be an electronic device or a functional module or functional entity in the electronic device that can implement the control method of the water-cooled air-conditioning unit. The electronic devices mentioned in the embodiment of the present application include but are not limited to mobile phones, tablet computers, computers, cameras, and wearable devices. The control method of a water-cooled air-conditioning unit provided in an embodiment of the present application is described below using an electronic device as an example of the execution subject.

[0110] like Figure 3 As shown, the control method of the water-cooled air-conditioning unit includes: step 110, step 120, step 130, step 140, step 150 and step 160.

[0111] Step 110 , obtaining the detected temperature value of the surface cooler 100 .

[0112] A first temperature sensor is provided on the air inlet side of the heat exchange coil 30 , and the first temperature sensor is used to detect the current temperature value of the airflow on the air inlet side in real time.

[0113] A second temperature sensor is provided on the air outlet side of the heat exchange coil 30 , and the second temperature sensor is used to detect the current temperature value of the airflow on the air outlet side in real time.

[0114] Step 120: Determine a first PID result through a PID control algorithm according to the detected temperature value and the target temperature value.

[0115] The first PID result can be calculated using the following formula:

[0116]

[0117] Step 130 : Determine the target opening of the flow control valve 200 according to the first PID result.

[0118] There is a corresponding relationship between the first PID result range and the target opening range of the flow control valve 200. For example, the first PID result range is [-200, 200], wherein the first PID result of 0 to 200 corresponds to a water valve opening of 0% to 100%.

[0119] Step 140 : determining a target water flow value of the flow control valve 200 according to the target opening of the flow control valve 200 .

[0120] Based on the correspondence between the target opening degree of the flow control valve 200 and the water flow rate of the flow control valve 200, the target opening degree is converted into the target water flow rate.

[0121] Step 150: Determine a second PID result through a PID control algorithm according to the target water flow value of the flow regulating valve 200 and the current water flow value detected by the flow sensor.

[0122] The second PID result can be calculated using the following formula:

[0123]

[0124] Step 160 : Determine and adjust the execution opening of the flow control valve 200 according to the second PID result.

[0125] There is also a corresponding relationship between the second PID result range and the opening range of the flow control valve 200 . For example, the second PID result range is [-200, 200], where the second PID result of 0 to 200 corresponds to an opening of 0% to 100% to determine the execution opening of the flow control valve 200 .

[0126] In some embodiments, step 130, determining the target opening of the flow control valve 200 according to the first PID result, includes:

[0127] Step 131: Set the minimum and maximum values ​​of the first PID result range.

[0128] If the value of u(k) calculated according to the formula is greater than the maximum value, the first PID result takes the maximum value;

[0129] If the value of u(k) calculated according to the formula is less than the minimum value, the first PID result takes the minimum value.

[0130] Step 132 : Determine the target opening of the flow control valve 200 according to the corresponding relationship between the first PID result range and the target opening of the flow control valve 200 .

[0131] In this embodiment, the first PID result range is limited to [-200, 200]. If it is less than the minimum boundary value -200 or greater than the maximum boundary value 200, the corresponding boundary value is taken. The first PID result of 0 to 200 corresponds to a water valve opening of 0% to 100%.

[0132] Similarly, in step 150, the second PID result is also set with a maximum value and a minimum value for range limitation. If the value of u(k) calculated according to the formula exceeds the maximum value or the minimum value, the second PID result takes the maximum value or the minimum value.

[0133] The control method of the water-cooled air-conditioning unit provided in the embodiment of the present application can be executed by a flow control device of the water-cooled air-conditioning unit. In the embodiment of the present application, the flow control device of the water-cooled air-conditioning unit executing the control method of the water-cooled air-conditioning unit is taken as an example to illustrate the flow control device of the water-cooled air-conditioning unit provided in the embodiment of the present application.

[0134] The present application also proposes a flow control device for a water-cooled air-conditioning unit, comprising: a temperature acquisition module, a first PID result calculation module, a target water flow calculation module, a second PID result calculation module and an opening determination module.

[0135] A temperature acquisition module, used to acquire the detected temperature value of the heat exchange side of the heat exchange coil 30;

[0136] A first PID result calculation module, used to determine a first PID result according to a detected temperature value and a target temperature value;

[0137] A target water flow calculation module, used to determine a target opening of the flow control valve 200 according to the first PID result, and determine a target water flow value of the flow control valve 200 according to the target opening of the flow control valve 200;

[0138] A second PID result calculation module, used to determine a second PID result according to a target water flow value of the flow regulating valve 200 and a current water flow value detected by the flow sensor 400;

[0139] The opening determination module is used to determine the opening of the flow control valve 200 according to the second PID result.

[0140] The flow control device of the water-cooled air-conditioning unit in the embodiment of the present application can be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or other devices other than the terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a car electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, a super mobile personal computer (Ultra-Mobile Personal Computer, UMPC), a netbook or a personal digital assistant (Personal Digital Assistant, PDA), etc., and can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (Personal Computer, PC), a television (Television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0141] The flow control device of the water-cooled air-conditioning unit in the embodiment of the present application may be a device having an operating system. The operating system may be a Microsoft (Windows) operating system, an Android (Android) operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0142] The flow control device for a water-cooled air-conditioning unit provided in the embodiment of the present application can implement each process implemented in the method embodiment, and will not be described again here to avoid repetition.

[0143] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0144] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0145] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0146] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0147] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method for a water-cooled air conditioning unit, characterized in that: include: Get the detected temperature value of the surface cooler; Determine a first PID result through a PID control algorithm according to the detected temperature value and the target temperature value; Determine the target opening of the flow control valve according to the first PID result; Determining a target water flow value of the flow regulating valve according to a target opening of the flow regulating valve; Determine a second PID result through a PID control algorithm according to the target water flow value of the flow regulating valve and the current water flow value detected by the flow sensor; The execution opening degree of the flow control valve is determined and adjusted according to the second PID result.

2. The control method of a water-cooled air conditioning unit according to claim 1, characterized in that: The first PID result and the second PID result are calculated using a discrete formula of a PID position algorithm.

3. The control method of a water-cooled air conditioning unit according to claim 2, characterized in that: The first PID result is calculated using the following formula: Where: u(k) represents the output control value; e(k) represents the difference between the target temperature value set by the user and the current temperature value detected by the temperature sensor; K P Coefficient of proportionality; K I Indicates the coefficient of integration; K D represents the coefficient of differentiation; ∑e(i) represents the accumulation of errors; e(k)-e(k-1) represents the current error minus the last error; The second PID result is calculated using the following formula: Where: u(k) represents the output control quantity; e(k) represents the difference between the target water flow rate and the current water flow rate detected by the flow sensor; K P Coefficient of proportionality; K I Indicates the coefficient of integration; K D represents the coefficient of differentiation; ∑e(i) represents the accumulation of errors; e(k)-e(k-1) represents the current error minus the last error.

4. The control method of a water-cooled air conditioning unit according to claim 1, characterized in that: Set the minimum and maximum values ​​of the first PID result and the second PID result; If the result calculated by the PID control algorithm is greater than the maximum value, the first PID result and the second PID result take the maximum value; If the result calculated by the PID control algorithm is less than the minimum value, the first PID result and the second PID result take the minimum value.

5. The control method of a water-cooled air conditioning unit according to claim 1, characterized in that The target opening and the execution opening are obtained according to the corresponding relationship between the opening of the flow control valve and the water flow, and the opening of the flow control valve corresponding to the first PID result and the second PID result is 0% to 100%.

6. A control system for a water-cooled air conditioning unit, characterized in that: include: A flow regulating valve is connected to the pipes in and out of the surface cooler and controls the water flow in and out of the surface cooler; A temperature sensor is used to sense the ambient temperature of the surface cooler to obtain a detection temperature value; A flow sensor is used to collect the water flow through the surface cooler to obtain the current water flow; A controller is signal-connected to the flow control valve, the temperature sensor and the flow sensor, and adjusts the execution opening of the flow control valve according to the flow control method according to any one of claims 1 to 5.

7. The control system of the water-cooled air conditioning unit according to claim 6, characterized in that: The temperature sensor includes a first temperature sensor and a second temperature sensor; the first temperature sensor is arranged on the air inlet side of the condenser to detect the current temperature value of the airflow on the air inlet side; the second temperature sensor is arranged on the air outlet side of the condenser to detect the current temperature value of the airflow on the air outlet side.

8. The control system of the water-cooled air conditioning unit according to claim 7, characterized in that: The flow regulating valve is an electric two-way valve.

9. A water-cooled air conditioning unit, characterized in that: It comprises a surface cooler and a control system according to any one of claims 6 to 8, wherein the surface cooler is connected to a main water inlet pipeline and a main water outlet pipeline.

10. The water-cooled air conditioning unit according to claim 9, characterized in that: The flow regulating valve is arranged on the main water outlet pipeline; the flow sensor is arranged on the main water inlet pipeline or the main water outlet pipeline.

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