Intelligent air conditioner cooling water management system

Abstract

The invention belongs to the technical field of cooling water treatment, and particularly discloses an intelligent air conditioner cooling water management system which comprises a main controller, an outlet water temperature sensor, a return water temperature sensor, an atmospheric temperature sensor, a blow-down electric valve, a plurality of start-stop detectors, a plurality of dosing metering pumps and a plurality of water quality monitoring sensors. The water quality of the cooling water is managed in a unified mode, out-of-control water quality management caused by various management conflicts is avoided, labor cost can be saved, and cooling water management is more stable; by monitoring the refrigerating unit which is started dynamically, the atmospheric temperature and the outlet and return water temperature and combining the medicament concentration and the pump flow, the medicament can be accurately added, the medicament and the water consumption are saved, and the efficacy of the medicament is exerted to the maximum extent; meanwhile, the approaching temperature of the condenser of the water chilling unit can be reduced to the maximum extent, and electricity waste caused by operation of the unit is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of cooling water treatment, and particularly relates to an intelligent air-conditioning cooling water management system. Background Art

[0002] The existing management methods for air-conditioning cooling water mainly include:

[0003] 1. A management method of manually adding chemicals, manually discharging sewage, manually testing water quality and appropriately adjusting the chemical dosage and sewage discharge duration. This method is not precise enough in chemical addition and sewage discharge, and is prone to human errors.

[0004] 2. A clock controller. A management method of using a clock to control a metering pump to add chemicals at regular intervals, using a clock to control sewage discharge at regular intervals, manually testing water quality and adjusting the chemical addition time and sewage discharge time. This method is crudely managed, and conflicts may occur during chemical addition and sewage discharge due to inaccurate clocks, and variables such as temperature changes and the number of operating refrigeration units are not considered in the management.

[0005] 3. A management method of using a conductivity probe and instrument to control sewage discharge, manually testing water quality and adjusting the chemical addition time and the conductivity control sewage discharge range. This method may also cause conflicts during chemical addition and sewage discharge, and variables such as temperature changes and the number of operating refrigeration units are not considered in the management.

[0006] 4. A control method using a multi-parameter water quality sensor with an instrument. The disadvantage of this method is that there is no unified management means between each instrument, and conflicts may also occur during chemical addition and sewage discharge. For example, during chemical addition, sewage is being discharged (generally, the sewage discharge time is longer than the chemical addition time). During the sewage discharge period, the chemical addition concentration cannot reach the preset value, easily resulting in waste of chemicals and water volume.

[0007] Generally speaking, the existing management methods for air-conditioning cooling water lack a unified control mechanism, and there is still room for improvement in management accuracy, and it is difficult to achieve reliable and stable cooling water control. Summary of the Invention

[0008] The purpose of the present invention is to provide an intelligent air-conditioning cooling water management system to solve the above problems existing in the prior art.

[0009] To achieve the above purpose, the present invention adopts the following technical solutions:

[0010] The present invention provides an intelligent air-conditioning cooling water management system, which includes a main controller, an outlet water temperature sensor, a return water temperature sensor, an atmospheric temperature sensor, a plurality of start-stop detectors, and a plurality of chemical dosing metering pumps. The outlet water temperature sensor is used to detect the temperature of the cooling water output from the cooling tower to the outlet pipe, obtain the outlet water temperature, and transmit the outlet water temperature to the main controller. The return water temperature sensor is used to detect the temperature of the return water returned from the return pipe to the cooling tower, obtain the return water temperature, and transmit the return water temperature to the main controller. The atmospheric temperature sensor is used to detect the atmospheric temperature outside the cooling tower, obtain the incoming tower atmospheric temperature, and transmit the incoming tower atmospheric temperature to the main controller. Each start-stop detector is respectively used to detect the start and stop of the chiller on each branch pipe, obtain the start-stop detection signal of the corresponding chiller, and transmit the start-stop detection signal to the main controller. The main controller is used to determine the started chillers and their circulating pump flow rates according to the start-stop detection signals of each chiller, calculate the hourly make-up water volume according to the incoming tower atmospheric temperature, the outlet water temperature, the return water temperature, and the circulating pump flow rates of each started chiller, calculate the dosing duration of each chemical according to the hourly make-up water volume, the pre-stored dosing concentration of each chemical, and the dosing flow rate of the chemical dosing metering pump corresponding to each chemical, and perform dosing control on the chemical dosing metering pump corresponding to each chemical according to the dosing duration of each chemical. Each chemical dosing metering pump is arranged on the dosing pipe, and the dosing pipe is connected in parallel with each branch pipe between the outlet pipe and the return pipe.

[0011] In a possible design, the system further includes a sewage discharge electric valve and a plurality of water quality monitoring sensors. The water quality monitoring sensors are used to detect the water quality of the return water, obtain the water quality detection result, and transmit the water quality detection result to the main controller. The main controller is used to perform dosing control on the chemical dosing metering pump corresponding to each chemical according to each water quality detection result, and control the sewage discharge electric valve to work during non-dosing periods to discharge the return water in the return pipe.

[0012] In a possible design, the sewage discharge electric valve is arranged on the sewage discharge pipe connected to the return pipe, and a filter and a sewage discharge water meter are further arranged on the sewage discharge pipe.

[0013] In a possible design, the water quality detection result includes EC value, TDS value, ORP value, residual chlorine content, PH value, and / or detection parameters of a fluorescence tracer sensor.

[0014] In a possible design, the system further includes a first signal transmission module and a second signal transmission module. The first signal transmission module is used to establish signal docking between the main controller and each start-stop detector, and the second signal transmission module is used to establish signal docking between the main controller and each water quality monitoring sensor.

[0015] In a possible design, when calculating the hourly makeup water volume according to the inlet tower ambient temperature, outlet water temperature, return water temperature, and the circulating pump flow rate of each activated chiller, the main controller substitutes the inlet tower ambient temperature into a preset evaporation loss coefficient table for matching to determine the corresponding evaporation loss coefficient. The evaporation loss coefficient table contains several evaporation loss coefficients and the inlet tower ambient temperatures associated with each evaporation loss coefficient; calculates the temperature difference using the outlet water temperature and the return water temperature; substitutes the determined evaporation loss coefficient, temperature difference, and the circulating pump flow rate of each activated chiller into a preset makeup water volume calculation formula for calculation to obtain the hourly makeup water volume. The makeup water volume calculation formula is

[0016]

[0017] where Q m is the hourly makeup water volume, K is the evaporation loss coefficient, Δt is the temperature difference, i is the number of the activated chiller, n is the number of activated chillers, Q i is the circulating pump flow rate of the activated chiller i, and N is the set concentration multiple.

[0018] In a possible design, when calculating the dosing duration of each chemical agent according to the hourly makeup water volume, the pre-stored dosing concentration of each chemical agent, and the dosing flow rate of the dosing metering pump corresponding to each chemical agent, the main controller multiplies the hourly makeup water volume by the pre-stored dosing concentration of each chemical agent to obtain the hourly dosing amount of each chemical agent, and then divides the hourly dosing amount of each chemical agent by the dosing flow rate of the dosing metering pump corresponding to each chemical agent and performs unit conversion to obtain the dosing duration of each chemical agent.

[0019] In a possible design, the start-stop detector includes a flow sensor, a pressure sensor, and / or a vibration sensor.

[0020] In a possible design, the chemical agents include scale and corrosion inhibitors, biocides, and sulfuric acid, and the several dosing metering pumps include the dosing metering pumps corresponding to the scale and corrosion inhibitors, biocides, and sulfuric acid.

[0021] In a possible design, the main controller is provided with a touch screen, which is used to input an external control signal to the main controller and control the working state of the main controller through the external control signal.

[0022] Beneficial effects: By uniformly managing the quality of cooling water, the present invention avoids the loss of water quality management caused by various management conflicts, saves labor costs, and makes the management of cooling water more stable. By monitoring the refrigeration units with dynamic startup, atmospheric temperature, inlet and outlet water temperatures, and combining with the chemical agent concentration and pump flow rate, precise dosing of chemical agents can be achieved, saving chemical agents and water consumption, and maximizing the efficacy of chemical agents. At the same time, the approach temperature of the condenser of the chiller can be minimized, reducing the electricity consumption wasted during the operation of the unit. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the system provided by the embodiment of the present invention.

[0025] In the figure: 1, main controller; 2, start-stop detector; 3, outlet water temperature sensor; 4, return water temperature sensor; 5, atmospheric temperature sensor; 6, chemical dosing metering pump; 7, water quality monitoring sensor; 8, sewage meter; 9, sewage electric valve; 10, filter; 11, first signal transmission module; 12, second signal transmission module. Detailed Embodiments

[0026] It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation on the present invention. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms and should not be construed as limited to the embodiments described herein.

[0027] It should be understood that unless otherwise clearly specified and defined, the corresponding terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments can be understood according to specific circumstances.

[0028] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. For example, a system may be shown in a block diagram to avoid obscuring the example with unnecessary details. In other embodiments, well-known processes, structures, and technologies may not be shown with unnecessary details to avoid obscuring the embodiments.

[0029] Embodiment:

[0030] This embodiment provides an intelligent air-conditioning cooling water management system, as Figure 1 shown, which includes a main controller, an outlet water temperature sensor, a return water temperature sensor, an atmospheric temperature sensor, a plurality of start-stop detectors, and a plurality of chemical dosing metering pumps. The outlet water temperature sensor is used to detect the temperature of the cooling water output from the cooling tower to the outlet water pipe to obtain the outlet water temperature, and transmit the outlet water temperature to the main controller. The return water temperature sensor is used to detect the temperature of the return water returned to the cooling tower from the return water pipe to obtain the return water temperature, and transmit the return water temperature to the main controller. The atmospheric temperature sensor is used to detect the atmospheric temperature outside the cooling tower to obtain the incoming tower atmospheric temperature, and transmit the incoming tower atmospheric temperature to the main controller. Each start-stop detector is respectively used to detect the start and stop of the chiller on each branch pipe to obtain the start-stop detection signal of the corresponding chiller, and transmit the start-stop detection signal to the main controller. The main controller is used to determine the started chillers and their circulating pump flow rates according to the start-stop detection signals of each chiller, calculate the hourly makeup water volume according to the incoming tower atmospheric temperature, the outlet water temperature, the return water temperature, and the circulating pump flow rates of each started chiller, and calculate the chemical dosing duration of each chemical according to the hourly makeup water volume, the pre-stored chemical dosing concentration of each chemical, and the chemical dosing flow rate of the chemical dosing metering pump corresponding to each chemical, and perform chemical dosing control on the chemical dosing metering pump corresponding to each chemical according to the chemical dosing duration of each chemical. Each chemical dosing metering pump is arranged on the chemical dosing pipe, and the chemical dosing pipe is connected in parallel with each branch pipe between the outlet water pipe and the return water pipe.

[0031] During specific implementation, the air-conditioning cooling water circulation pipeline includes a cooling tower, an outlet pipe, and a return pipe. The outlet end of the cooling tower is connected to the outlet pipe, and the return end is connected to the return pipe. A chemical dosing pipe and several branch pipes are connected in parallel between the outlet pipe and the return pipe. Chillers are arranged on each branch pipe, and each chemical dosing metering pump is arranged on the chemical dosing pipe. An outlet temperature sensor is arranged at the outlet end of the cooling tower, a return water temperature sensor is arranged at the return end of the cooling tower, and an ambient air temperature sensor is arranged outside the cooling tower. A stop valve and a check valve can be arranged on the chemical dosing pipe for water flow control. When the system is started and chemicals need to be added to the cooling water during operation, the main controller can respectively collect the start-stop detection signals of each chiller through a start-stop detector, and then determine the started chillers according to the start-stop detection signals of each chiller, and determine the circulating pump flow rate of the started chillers. The start-stop detector includes a flow sensor, a pressure sensor, and / or a vibration sensor. The flow sensor can collect the working flow rate of the chiller, the pressure sensor can collect the output water pressure of the chiller, and the vibration sensor can collect the vibration detection signal of the chiller. The start-stop detection signal can include a flow signal, a water pressure, and / or a vibration detection signal, so that the main controller can accurately determine the working chiller. The main controller can collect the outlet water temperature through the outlet temperature sensor, collect the return water temperature through the return water temperature sensor, and collect the ambient air temperature entering the tower through the ambient air temperature sensor.

[0032] Then, the main controller can calculate the hourly makeup water volume according to the ambient air temperature entering the tower, the outlet water temperature, the return water temperature, and the circulating pump flow rate of each started chiller: substitute the ambient air temperature entering the tower into the preset evaporation loss coefficient table for matching to determine the corresponding evaporation loss coefficient. The evaporation loss coefficient table includes several evaporation loss coefficients and the ambient air temperature associated with each evaporation loss coefficient; calculate the temperature difference using the outlet water temperature and the return water temperature; substitute the determined evaporation loss coefficient, the temperature difference, and the circulating pump flow rate of each started chiller into the preset makeup water volume formula for calculation to obtain the hourly makeup water volume. The makeup water volume formula is

[0033]

[0034] where, Q m is the hourly makeup water volume, K is the evaporation loss coefficient, Δt is the temperature difference, i is the number of the started chiller, n is the number of started chillers, Q i is the circulating pump flow rate of the started chiller i, N is the set concentration multiple. The concentration multiple is a fixed value that can be achieved based on the chemical formulations of each chemical manufacturer and the comprehensive judgment of the makeup water quality of the user. Exemplarily, a value in the range of 3 - 5 can be set.

[0035] That is, first calculate the evaporation amount Then, based on the evaporation amount Q eCalculate the hourly make-up water volume Q m = Q e × N ÷ (N - 1). The circulating pump flow rate and evaporation loss coefficient table of each chiller can be preset. Exemplarily, the evaporation loss coefficient table can be as shown in Table 1 below:

[0036] Table 1

[0037] Inlet tower atmospheric temperature °C -10 0 10 20 30 40 K(1 / ℃) 0.0008 0.0010 0.0012 0.0014 0.0015 0.0016

[0038] Q i is a dynamically monitored value, K is a dynamically matched value, △t is a dynamically monitored value, and N is a fixed value. In this way, when any one chiller or multiple chillers are turned on, the make-up water volume within the current hour can be calculated in real time. Example: For a 500-ton chiller, the circulating pump flow rate is 400 m 3 / h, the temperature difference between the inlet and outlet water of the cooling tower is 4°C, and the concentration multiple is 5 times. Calculate the hourly make-up water volume Q m = 0.0015 × 4°C × 400 m 3 / h × 5 ÷ (5 - 1) = 3 tons.

[0039] Finally, the main controller can calculate the dosing duration of each chemical agent according to the hourly make-up water volume, the pre-stored dosing concentration of each chemical agent, and the dosing flow rate of the dosing metering pump corresponding to each chemical agent: Multiply the hourly make-up water volume by the pre-stored dosing concentration of each chemical agent to obtain the hourly dosing amount of each chemical agent, and then divide the hourly dosing amount of each chemical agent by the dosing flow rate of the dosing metering pump corresponding to each chemical agent and perform unit conversion to obtain the dosing duration of each chemical agent. All chemical agents are calculated based on the amount of chemical agent per ton of water provided by the manufacturer to determine how many liters of chemical agent need to be added for each ton of water replenished (i.e., the dosing concentration), and the dosing flow rate of each dosing metering pump is preset. The chemical agents include scale inhibitor, bactericide, corrosion inhibitor, and sulfuric acid, and the several dosing metering pumps include the dosing metering pumps corresponding to scale inhibitor, bactericide, corrosion inhibitor, and sulfuric acid. Exemplarily, the dosing concentration of the scale inhibitor is A ml / ton, and the dosing flow rate of the corresponding dosing metering pump is S L / h. Here, first convert the hourly flow rate of the dosing metering pump to seconds, i.e., the flow rate per second (S ÷ 3600 seconds) / L, and also convert the hourly dosing amount from (milliliters) ml to (liters) L, and then divide the hourly dosing amount (liters) L by the flow rate per second (liters) L = dosing duration (seconds). The dosing duration of the scale inhibitor = Qm × A ÷ 1000 ÷ (S ÷ 3600). For example, if the hourly make-up water volume = 3 tons, the dosing concentration A = 50 ml / ton, and the flow rate of the dosing metering pump S = 9 L / h, the corresponding dosing duration = 3 × 50 ÷ 1000 ÷ (9 ÷ 3600) = 60 seconds, and so on.

[0040] Further, the system further includes a sewage discharge electric valve and several water quality monitoring sensors. The water quality monitoring sensors are used to detect the water quality of the return water, obtain the water quality detection results, and transmit the water quality detection results to the main controller. The main controller is used to determine whether chemical dosing is required based on each water quality detection result, and when it is determined that chemical dosing is required, control the chemical dosing metering pumps corresponding to each chemical according to the calculated chemical dosing duration. At the same time, the main controller can also control the sewage discharge electric valve to work during non-chemical dosing periods based on each water quality detection result, discharging the return water in the return water pipeline. The main controller adopts a control method of dosing first and then discharging sewage, that is, giving priority to dosing control, and sewage discharge control can be carried out at other times. The sewage discharge electric valve is arranged on the sewage discharge pipeline connected to the return water pipeline, and a filter and a sewage discharge water meter are also arranged on the sewage discharge pipeline. The sewage discharge water meter is used to measure the sewage discharge volume, and the filter can protect the sewage discharge electric valve and the sewage discharge water meter. The water quality detection results may include EC (electrical conductivity) value, TDS (total dissolved solids) value, ORP (oxidation-reduction potential) value, residual chlorine content, PH value, and / or detection parameters of the fluorescence tracer sensor, and may also include turbidity, corrosion rate, total copper content, total iron content, calcium ion content, temperature, etc.

[0041] Expansionally, the system can select a logical control method for controlling water quality by the sensor detection results, or a program control method in which the main controller automatically calculates the makeup water volume, chemical dosing volume, and chemical dosing duration, or a mixed control method combining some sensors and some main controller logic controls. The logical control method for controlling water quality by the sensor detection results means that when the water quality sensor detects that the chemical concentration in the circulating cooling water is higher than the control upper limit, control the chemical dosing metering pump to stop the chemical dosing action, and when it detects that the chemical concentration in the cooling water is lower than the control lower limit, control the chemical dosing metering pump to start the chemical dosing action.

[0042] The main controller is provided with a touch screen for human-computer interaction. The touch screen is used to input external control signals to the main controller and control the working state of the main controller through the external control signals. At the same time, the touch screen can be used to input various control parameters to the main controller, such as the flow rate of the chemical dosing pump, various chemical concentration values, concentration ratio control values, sensor ranges, etc. The system further includes a first signal transmission module and a second signal transmission module. The first signal transmission module is used to establish signal docking between the main controller and each start-stop detector, and the second signal transmission module is used to establish signal docking between the main controller and each water quality monitoring sensor. The transmission methods of the first signal transmission module and the second signal transmission module include wired transmission (such as RS232, RS485, RS422, etc.) or wireless transmission (lora, WIFI, 4G, 5G, etc.). [[ID= {7}]] [[ID= {8}]]

[0043] At the hardware level, the main controller may include: a data interface for establishing data docking between the processor and external devices; a memory for storing instructions; and a processor for reading the instructions stored in the memory and executing the corresponding control logic according to the instructions. Optionally, the main controller may further include an internal bus, through which the processor, the memory, and the data interface can be interconnected with each other. The internal bus may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory may include, but is not limited to, a random access memory (RAM), a read only memory (ROM), a flash memory, a first input first output (FIFO) memory, and / or a first in last out (FILO) memory, etc. The processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; or it may be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0044] By uniformly managing the quality of the cooling water, this system can avoid the out-of-control of water quality management caused by various management conflicts, save labor costs, and make the management of cooling water more stable. By monitoring the dynamically started refrigeration units, the atmospheric temperature, the inlet and outlet water temperatures, and combining with the chemical agent concentration and the pump flow rate, the accurate dosing of chemical agents can be achieved, saving chemical agents and water consumption, and maximizing the efficacy of chemical agents. At the same time, the approach temperature of the condenser of the chiller can be minimized, reducing the electricity consumption wasted during the operation of the unit.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent air-conditioning cooling water management system, characterized in that, It includes a main controller, an outlet water temperature sensor, a return water temperature sensor, an atmospheric temperature sensor, several start-stop detectors and several chemical dosing metering pumps. The outlet water temperature sensor is used to detect the temperature of the cooling water output from the cooling tower to the outlet pipe, obtain the outlet water temperature, and transmit the outlet water temperature to the main controller. The return water temperature sensor is used to detect the temperature of the return water returned from the return pipe to the cooling tower, obtain the return water temperature, and transmit the return water temperature to the main controller. The atmospheric temperature sensor is used to detect the atmospheric temperature outside the cooling tower, obtain the incoming tower atmospheric temperature, and transmit the incoming tower atmospheric temperature to the main controller. Each start-stop detector is respectively used to detect the start and stop of the chiller on each branch pipe, obtain the start-stop detection signal of the corresponding chiller, and transmit the start-stop detection signal to the main controller. The main controller is used to determine the started chillers and the flow rate of their circulating pumps according to the start-stop detection signals of each chiller, calculate the hourly makeup water volume according to the incoming tower atmospheric temperature, outlet water temperature, return water temperature and the flow rate of the circulating pumps of each started chiller, calculate the dosing duration of each chemical according to the hourly makeup water volume, the pre-stored dosing concentration of each chemical and the dosing flow rate of the corresponding chemical dosing metering pump, and perform dosing control on the chemical dosing metering pumps corresponding to each chemical according to the dosing duration of each chemical. Each chemical dosing metering pump is arranged on the dosing pipe, and the dosing pipe is connected in parallel with each branch pipe between the outlet pipe and the return pipe.

2. The intelligent air-conditioning cooling water management system according to claim 1, characterized in that, The system further includes a sewage discharge electric valve and several water quality monitoring sensors. The water quality monitoring sensors are used to detect the water quality of the return water, obtain the water quality detection result, and transmit the water quality detection result to the main controller. The main controller is used to perform dosing control on the chemical dosing metering pumps corresponding to each chemical according to each water quality detection result, and control the sewage discharge electric valve to work during the non-dosing period to discharge the return water with unqualified water quality detection results in the return pipe.

3. The intelligent air-conditioning cooling water management system according to claim 2, wherein The sewage discharge electric valve is arranged on the sewage discharge pipe connected to the return pipe, and a filter and a sewage discharge water meter are also arranged on the sewage discharge pipe.

4. The intelligent air-conditioning cooling water management system according to claim 2, wherein, The water quality detection results include EC value, TDS value, ORP value, residual chlorine content, PH value and / or detection parameters of the fluorescence tracer sensor.

5. The intelligent air conditioner cooling water management system according to claim 2, wherein The system further includes a first signal transmission module and a second signal transmission module. The first signal transmission module is used to establish signal docking between the main controller and each start-stop detector, and the second signal transmission module is used to establish signal docking between the main controller and each water quality monitoring sensor.

6. The intelligent air conditioner cooling water management system according to claim 1, wherein, When calculating the hourly make-up water volume based on the inlet tower atmospheric temperature, outlet water temperature, return water temperature, and the circulating pump flow rates of each activated chiller, the main controller substitutes the inlet tower atmospheric temperature into a pre-set evaporation loss coefficient table for matching to determine the corresponding evaporation loss coefficient. The evaporation loss coefficient table contains several evaporation loss coefficients and the inlet tower atmospheric temperatures associated with each evaporation loss coefficient; calculates the temperature difference using the outlet water temperature and the return water temperature; substitutes the determined evaporation loss coefficient, temperature difference, and the circulating pump flow rates of each activated chiller into a pre-set make-up water volume calculation formula for calculation to obtain the hourly make-up water volume. The make-up water volume calculation formula is Among them, Q m is the make-up water volume per hour, K is the evaporation loss coefficient, Δt is the temperature difference, i is the number of the chilled water units that have been started, n is the number of the chilled water units that have been started, and Q i is the circulating pump flow rate of the started chilled water unit i, and N is the set concentration multiple.

7. The intelligent air-conditioning cooling water management system according to claim 1, wherein, When calculating the dosing duration of each chemical agent based on the hourly make-up water volume, the pre-stored dosing concentration of each chemical agent, and the dosing flow rate of the dosing metering pump corresponding to each chemical agent, the main controller multiplies the hourly make-up water volume by the pre-stored dosing concentration of each chemical agent to obtain the hourly dosing amount of each chemical agent, and then divides the hourly dosing amount of each chemical agent by the dosing flow rate of the dosing metering pump corresponding to each chemical agent and performs unit conversion to obtain the dosing duration of each chemical agent.

8. The intelligent air conditioner cooling water management system according to claim 1, wherein The start-stop detector includes a flow sensor, a pressure sensor, and / or a vibration sensor.

9. The intelligent air-conditioning cooling water management system according to claim 1, wherein The chemical agents include scale inhibitors, biocides, corrosion inhibitors, and sulfuric acid. The several dosing metering pumps include the dosing metering pumps corresponding to scale inhibitors, biocides, corrosion inhibitors, and sulfuric acid.

10. The intelligent air-conditioning cooling water management system according to claim 1, wherein The main controller is provided with a touch screen, which is used to input an external control signal to the main controller and control the working state of the main controller through the external control signal.

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