Chiller maintenance method, maintenance device, and device with storage function

Abstract

The embodiments of the present application provide a maintenance method, a maintenance device, and a device with a storage function for a chiller, and relate to the technical field of HVAC equipment. The maintenance method for the chiller includes obtaining a first standard heat exchange effect curve of a refrigerant in the chiller, collecting heat exchange effect data of the refrigerant, generating a heat exchange effect curve of the refrigerant based on the heat exchange effect data, comparing the first standard heat exchange effect curve with the heat exchange effect curve, and sending a maintenance signal or a signal indicating that the chiller is operating normally based on the comparison result. The heat exchange effect curve of the refrigerant can be intelligently generated, making the comparison result with the first standard heat exchange effect curve more accurate, and then the chiller can be maintained or cleaned of dirt by sending a maintenance signal in a timely manner, thereby improving the energy-saving effect of the system, avoiding energy waste, and being beneficial to energy conservation and environmental protection.

Description

Technical Field

[0001] The present application relates to the technical field of HVAC equipment, and in particular to a maintenance method, a maintenance device, and a device with a storage function for a chiller. Background Art

[0002] As living standards continue to improve, HVAC equipment is widely used in various buildings. While providing a comfortable living environment, it also consumes significant amounts of energy. Chillers account for a significant portion of HVAC equipment energy consumption, making reducing chiller energy consumption a key concern for users. Chillers typically use refrigerants such as pure water and ethylene glycol solutions. Over time, impurities in the refrigerant accumulate, increasing the chiller's fouling resistance and reducing its energy efficiency.

[0003] Currently, the chiller's heat transfer efficiency will only be affected when the fouling thermal resistance reaches a certain level, triggering an alarm prompt for chiller maintenance or cleaning. However, by this point, the chiller's heat transfer efficiency is already very low, wasting a lot of energy and harming environmental protection and energy conservation. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a maintenance method, a maintenance device, and a device with a storage function for a chiller, so as to achieve the technical effect of real-time detection of the dirt thermal resistance in the chiller, timely maintenance and cleaning, and improving the energy-saving effect of the system.

[0005] The present invention provides a method for maintaining a chiller, including:

[0006] Obtaining a first standard heat exchange effect curve of a refrigerant in a chiller;

[0007] Collecting heat exchange effect data of the coolant;

[0008] generating a heat exchange effect curve of the brine according to the heat exchange effect data;

[0009] comparing the first standard heat exchange effect curve with the heat exchange effect curve;

[0010] A maintenance signal or a signal that the chiller is operating normally is sent according to the comparison result.

[0011] In the above implementation process, by collecting the heat exchange effect data of the refrigerant, generating the heat exchange effect curve of the refrigerant according to the heat exchange effect data, and comparing the collected heat exchange effect curve with the first standard heat exchange effect curve, so as to send a maintenance signal or a signal that the chiller is operating normally according to the comparison result, the intelligent generation of the heat exchange effect curve of the refrigerant can be realized, so that the comparison result with the first standard heat exchange effect curve is more accurate, and thus more precise maintenance or dirt cleaning of the chiller can be achieved, which can improve the energy-saving effect of the system, avoid energy waste, and is beneficial to energy saving and environmental protection.

[0012] Furthermore, the method for obtaining the first standard heat exchange effect curve of the refrigerant in the chiller includes:

[0013] Obtaining the type of the coolant;

[0014] The first standard heat exchange effect curve is determined according to the type of the secondary refrigerant.

[0015] In the above implementation process, by determining the first standard heat exchange effect curve according to the type of the refrigerant, the first standard heat exchange effect curve can be made more accurate, and the obtained first deviation value is also more accurate.

[0016] Furthermore, before collecting the heat exchange effect data of the brine, the process further includes:

[0017] Control the operating data of the chiller so that the chiller is in a stable state.

[0018] In the above implementation process, by controlling the chiller to a stable state and then obtaining the heat exchange effect data of the refrigerant, the obtained heat exchange effect data can be less affected by the environment and thus more accurate.

[0019] Furthermore, the method of controlling the operating data of the chiller so that the chiller is in a stable state and collecting the heat exchange effect data of the brine includes:

[0020] Controlling the energy regulation of the chiller, and the evaporation saturation temperature and condensation saturation temperature of the chiller to remain stable;

[0021] Determine whether the energy adjustment of the chiller is within a preset energy adjustment range, whether the evaporation saturation temperature is within a first preset temperature range, and whether the condensation saturation temperature is within a second preset temperature range;

[0022] If the energy adjustment of the chiller is within the preset energy adjustment range, the evaporation saturation temperature is within the first preset temperature range, and the condensation saturation temperature is within the second preset temperature range, controlling the water pump of the chiller to perform variable flow operation;

[0023] Determine whether the water temperature fluctuation amplitude at different flow rates of the water pump is within a preset water temperature fluctuation amplitude range;

[0024] If the water temperature fluctuation amplitude under different flow rates of the water pump is within a preset water temperature fluctuation amplitude range, the heat exchange effect data of the brine is collected.

[0025] In the above implementation process, by controlling the internal environment of the chiller to a relatively stable state and then obtaining the heat exchange effect data of the refrigerant, the obtained heat exchange effect data can be less affected by the environment and thus more accurate.

[0026] Furthermore, the method for controlling the water pump of the chiller to perform variable flow operation includes:

[0027] Obtaining the flow value of the water pump through the refrigerant flow meter in the chiller;

[0028] The flow rate of the water pump is adjusted according to the flow rate value of the water pump.

[0029] In the above implementation process, the flow value of the water pump is directly obtained through the refrigerant flow meter, which can make the obtained flow value highly accurate and the calculation load small.

[0030] Furthermore, the method for controlling the water pump of the chiller to perform variable flow operation includes:

[0031] Obtaining the output load and water temperature difference of the chiller;

[0032] Performing flow simulation of the water pump according to the output load and the water temperature difference;

[0033] Acquiring a flow rate value of the water pump according to a flow rate simulation of the water pump;

[0034] The flow rate of the water pump is adjusted according to the flow rate value of the water pump.

[0035] In the above implementation process, the flow of the water pump is simulated by outputting the load and the water temperature difference to obtain the flow value of the water pump, which can save the installation of the refrigerant flow meter, making the overall structure of the chiller simpler, and avoiding the problem of inaccurate measurement caused by the refrigerant flow meter being affected by the environment.

[0036] Furthermore, the method of comparing the first standard heat exchange effect curve with the heat exchange effect curve and sending a maintenance signal or a signal indicating that the chiller is operating normally according to the comparison result includes:

[0037] comparing the first standard heat exchange effect curve with the heat exchange effect curve to obtain a first deviation value between the first standard heat exchange effect curve and the heat exchange effect curve;

[0038] Determining whether the first deviation value is greater than or equal to a first preset deviation value;

[0039] If the first deviation value is greater than or equal to a first preset deviation value, determining whether the first deviation value is greater than or equal to a second preset deviation value;

[0040] If the first deviation value is greater than or equal to a second preset deviation value, sending a physical maintenance signal;

[0041] If the first deviation value is less than a second preset deviation value, sending a self-cleaning maintenance signal;

[0042] If the first deviation value is less than a first preset deviation value, a signal indicating that the chiller is operating normally is sent.

[0043] In the above implementation process, the situation where the first deviation value is greater than or equal to the first preset deviation value is further divided into two situations, so that self-cleaning maintenance is performed when the first deviation value is small, and physical maintenance is performed when the first deviation value is large, which can avoid wasting manpower and material resources and achieve more efficient maintenance effects.

[0044] Furthermore, the first deviation value is a difference between the slope of the first standard heat exchange effect curve and the slope of the heat exchange effect curve, or a difference between the intercept of the first standard heat exchange effect curve and the intercept of the heat exchange effect curve.

[0045] In the above implementation process, the difference between the slope of the first standard heat exchange effect curve and the slope of the heat exchange effect curve, or the difference between the intercept of the first standard heat exchange effect curve and the intercept of the heat exchange effect curve is used as the first deviation value, which can make the judgment of the dirt situation in the chiller more accurate.

[0046] Furthermore, it also includes:

[0047] Obtain the second standard heat exchange effect curve of the refrigerant in the chiller at different concentrations;

[0048] comparing the second standard heat exchange effect curve with the heat exchange effect curve to obtain a second deviation value between the second standard heat exchange effect curve and the heat exchange effect curve;

[0049] The concentration value of the brine is obtained according to the second deviation value.

[0050] In the above implementation process, the concentration value of the brine is calculated by the heat exchange effect curve, which can save the installation of the brine concentration meter, make the overall structure of the chiller simpler, and reduce the equipment preparation and installation costs.

[0051] Furthermore, after obtaining the concentration value of the brine according to the second deviation value, the method further includes:

[0052] Determining whether the concentration value of the brine is less than a first preset concentration value;

[0053] If the concentration value of the brine is less than the first preset concentration value, sending a signal to replenish the brine;

[0054] If the concentration value of the brine is greater than or equal to the first preset concentration value, determining whether the concentration value of the brine is less than or equal to a second preset concentration value;

[0055] If the concentration value of the brine is less than or equal to a second preset concentration value, it is determined that the chiller is operating normally, and the concentration value of the brine is sent;

[0056] If the concentration value of the brine is greater than the second preset concentration value, a signal for recovering the brine is sent.

[0057] In the above implementation process, by replenishing or recycling the refrigerant in the chiller according to the concentration value of the refrigerant, the real-time concentration value of the refrigerant in the chiller can be controlled to avoid waste of refrigerant, save the cost of refrigerant, and make the energy-saving effect of the chiller better, which is beneficial to environmental protection.

[0058] Furthermore, before sending the signal for replenishing the brine, the method further includes: obtaining the mass or volume of the brine to be replenished according to the concentration value and the target concentration value of the brine;

[0059] Before sending the signal for recovering the brine, the method further includes: obtaining the mass or capacity of the brine to be recovered according to the concentration value and the target concentration value of the brine.

[0060] In the above implementation process, the mass or capacity of the brine to be replenished or recovered is obtained by comparing the obtained concentration value of the brine with the target concentration value, so that the brine can be accurately replenished or recovered.

[0061] The present invention provides a chiller maintenance device, comprising:

[0062] A transceiver, configured to obtain a first standard heat exchange effect curve of a brine in a chiller and obtain heat exchange effect data of the brine;

[0063] A processor is connected to the transceiver and is used to generate a heat exchange effect curve of the refrigerant based on the heat exchange effect data, compare the first standard heat exchange effect curve with the heat exchange effect curve, and send a maintenance signal or a signal indicating that the chiller is operating normally based on the comparison result.

[0064] An embodiment of the present application provides a device with a storage function, which stores program data. The program data can be executed to implement the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0066] Figure 1 This is a flow chart of a chiller maintenance method provided in an embodiment of the present application;

[0067] Figure 2 This is a flow chart of another chiller maintenance method provided in an embodiment of the present application;

[0068] Figure 3 This is a flow chart of another chiller maintenance method provided in an embodiment of the present application;

[0069] Figure 4 This is a schematic structural diagram of a maintenance device for a chiller provided in an embodiment of the present application;

[0070] Figure 5 It is a structural diagram of a device with storage function provided in an embodiment of the present application. DETAILED DESCRIPTION

[0071] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0072] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0073] Please see Figure 1 , Figure 1 A schematic flow chart of a chiller maintenance method provided in an embodiment of the present application. The chiller maintenance method includes:

[0074] S110: Obtain a first standard heat exchange effect curve of a refrigerant in a chiller.

[0075] Optionally, the first standard heat exchange effect curve is pre-stored data, or the first standard heat exchange effect curve is obtained by statistics or learning based on previously acquired data.

[0076] S120: Collect heat exchange effect data of the coolant.

[0077] Optionally, the heat exchange effect data may refer to the heat exchange coefficient of the brine side at different flow rates of the brine, or may be other data characterizing the heat exchange effect of the brine side, which is not limited here.

[0078] S130: Generate a heat exchange effect curve of the coolant according to the heat exchange effect data.

[0079] Optionally, the heat exchange effect data is processed by a built-in processor of the chiller or an external processor to generate a heat exchange effect curve.

[0080] S140: Compare the first standard heat exchange effect curve with the heat exchange effect curve.

[0081] S150: Send a maintenance signal or a signal indicating that the chiller is operating normally according to the comparison result.

[0082] In the above implementation process, by collecting the heat exchange effect data of the refrigerant, generating the heat exchange effect curve of the refrigerant according to the heat exchange effect data, and comparing the collected heat exchange effect curve with the first standard heat exchange effect curve, so as to send a maintenance signal or a signal that the chiller is operating normally according to the comparison result, the intelligent generation of the heat exchange effect curve of the refrigerant can be realized, so that the comparison result with the first standard heat exchange effect curve is more accurate, and thus more precise maintenance or dirt cleaning of the chiller can be achieved, which can improve the energy-saving effect of the system, avoid energy waste, and is beneficial to energy saving and environmental protection.

[0083] Please see Figure 2 , Figure 2 A flow chart of another chiller maintenance method provided in an embodiment of the present application. The chiller maintenance method includes:

[0084] S211. Obtain the type of coolant.

[0085] Optionally, the coolant is pure water, ethylene glycol solution, calcium chloride solution, sodium chloride solution, etc.

[0086] Optionally, the type of the secondary coolant is manually input or automatically identified.

[0087] S212. Determine a first standard heat exchange effect curve according to the type of the refrigerant.

[0088] Optionally, the first standard heat exchange effect curve is pre-stored data corresponding to the type of brine, or the first standard heat exchange effect curve is obtained through statistics or learning of data obtained previously for brine of the same type.

[0089] For example, the user may input the type of the refrigerant as ethylene glycol solution. After receiving the type information of the refrigerant, the maintenance device of the chiller retrieves the first standard heat exchange effect curve corresponding to the ethylene glycol solution.

[0090] In the above implementation process, by determining the first standard heat exchange effect curve according to the type of the refrigerant, the first standard heat exchange effect curve can be made more accurate, and the obtained first deviation value is also more accurate.

[0091] S220: Control the operating data of the chiller so that the chiller is in a stable state.

[0092] In the above implementation process, by controlling the chiller to a stable state and then obtaining the heat exchange effect data of the refrigerant, the obtained heat exchange effect data can be less affected by the environment and thus more accurate.

[0093] S230: Collect heat exchange effect data of the coolant.

[0094] Optionally, the heat exchange effect data may refer to the heat exchange coefficient of the brine side at different flow rates of the brine, or may be other data characterizing the heat exchange effect of the brine side, which is not limited here.

[0095] Optionally, the method of controlling the operating data of the chiller so that the chiller is in a stable state includes:

[0096] S221. Control the energy regulation of the chiller, and keep the evaporation saturation temperature and condensation saturation temperature of the chiller stable.

[0097] Among them, the energy adjustment of the chiller can be the frequency of the chiller, the guide vane opening, etc.

[0098] S222: Determine whether the energy adjustment of the chiller is within a preset energy adjustment range, whether the evaporation saturation temperature is within a first preset temperature range, and whether the condensation saturation temperature is within a second preset temperature range.

[0099] S223: If the energy adjustment of the chiller is within the preset energy adjustment range, the evaporation saturation temperature is within the first preset temperature range, and the condensation saturation temperature is within the second preset temperature range, the water pump of the chiller is controlled to perform variable flow operation.

[0100] In the above implementation process, by controlling the internal environment of the chiller to a relatively stable state and then obtaining the heat exchange effect data of the refrigerant, the obtained heat exchange effect data can be less affected by the environment and thus more accurate.

[0101] If the energy adjustment of the chiller is not within the preset energy adjustment range, or the evaporation saturation temperature is not within the first preset temperature range, or the condensation saturation temperature is not within the second preset temperature range, then return to step S221 and re-adjust and control the energy adjustment, evaporation saturation temperature or condensation saturation temperature of the chiller until the energy adjustment of the chiller is within the preset energy adjustment range, the evaporation saturation temperature is within the first preset temperature range, and the condensation saturation temperature is within the second preset temperature range.

[0102] S224: Determine whether the water temperature fluctuation amplitude at different flow rates of the water pump is within a preset water temperature fluctuation amplitude range.

[0103] S230: If the water temperature fluctuation amplitude at different flow rates of the water pump is within a preset water temperature fluctuation amplitude range, heat exchange effect data of the brine is collected.

[0104] In the above implementation process, by ensuring that the water temperature fluctuation amplitude at different flow rates of the water pump is within the preset water temperature fluctuation amplitude range, the stability of the system can be guaranteed. After the system is stable, the collected heat exchange effect data of the refrigerant is more accurate.

[0105] Optionally, the flow rate of the water pump can be gradually increased from the minimum flow rate to the maximum flow rate in a step-by-step manner to ensure that the entire system is more stable.

[0106] If the water temperature fluctuation amplitude at different flow rates of the water pump is not within the preset water temperature fluctuation amplitude range, then the process returns to step S221 and re-adjusts and controls the energy adjustment, evaporation saturation temperature, or condensation saturation temperature of the chiller until the water temperature fluctuation amplitude at different flow rates of the water pump is within the preset water temperature fluctuation amplitude range. Optionally, the method for controlling the water pump of the chiller to perform variable flow operation may include:

[0107] S2231. Obtain the flow value of the water pump through the refrigerant flow meter in the chiller.

[0108] In the above implementation process, the flow value of the water pump is directly obtained through the refrigerant flow meter, which can make the obtained flow value highly accurate and the calculation load small.

[0109] S2232. Adjust the flow rate of the water pump according to the flow rate value of the water pump.

[0110] Optionally, the method for controlling the water pump of the chiller to perform variable flow operation may further include:

[0111] S2233. Obtain the output load and water temperature difference of the chiller.

[0112] S2234. Simulate the flow rate of the water pump according to the output load and water temperature difference.

[0113] S2235. Acquire the flow value of the water pump according to the flow simulation of the water pump.

[0114] S2236. Adjust the flow rate of the water pump according to the flow rate value of the water pump.

[0115] In the above implementation process, the flow of the water pump is simulated by outputting the load and the water temperature difference to obtain the flow value of the water pump, which can save the installation of the refrigerant flow meter, making the overall structure of the chiller simpler, and avoiding the problem of inaccurate measurement caused by the refrigerant flow meter being affected by the environment.

[0116] Optionally, the chiller maintenance method may further include: re-collecting heat exchange effect data of the refrigerant after a first preset cycle time, and determining whether a maintenance signal needs to be sent.

[0117] Optionally, the first preset cycle time may be set by a user, or may be obtained by statistics or learning based on previously acquired first preset cycle times.

[0118] S240: Compare the first standard heat exchange effect curve with the heat exchange effect curve.

[0119] S250: Send a maintenance signal or a signal indicating that the chiller is operating normally according to the comparison result.

[0120] Optionally, the method of comparing the first standard heat exchange effect curve with the heat exchange effect curve and sending a maintenance signal or a signal indicating that the chiller is operating normally according to the comparison result includes:

[0121] S241 . Compare the first standard heat exchange effect curve with the heat exchange effect curve to obtain a first deviation value between the first standard heat exchange effect curve and the heat exchange effect curve.

[0122] Optionally, the first deviation value may be a difference between the slope of the first standard heat exchange effect curve and the slope of the heat exchange effect curve, or a difference between the intercept of the first standard heat exchange effect curve and the intercept of the heat exchange effect curve.

[0123] In the above implementation process, the difference between the slope of the first standard heat exchange effect curve and the slope of the heat exchange effect curve, or the difference between the intercept of the first standard heat exchange effect curve and the intercept of the heat exchange effect curve is used as the first deviation value, which can make the judgment of the dirt situation in the chiller more accurate.

[0124] S242: Determine whether the first deviation value is greater than or equal to a first preset deviation value.

[0125] Optionally, the first preset deviation value is pre-stored data, or the first preset deviation value is obtained by statistics or learning based on previously acquired data.

[0126] S243: If the first deviation value is greater than or equal to the first preset deviation value, determine whether the first deviation value is greater than or equal to the second preset deviation value.

[0127] Optionally, the second preset deviation value is pre-stored data, or the second preset deviation value is obtained by statistics or learning based on previously acquired data.

[0128] S244: If the first deviation value is less than the first preset deviation value, a signal indicating that the chiller is operating normally is sent.

[0129] S245: If the first deviation value is greater than or equal to the second preset deviation value, send a physical maintenance signal.

[0130] If the first deviation value is greater than or equal to the second preset deviation value, it indicates that the chiller is greatly affected by the dirt thermal resistance and physical maintenance such as manual cleaning of the water system (including heat exchange tubes, etc.), water system filtering devices, and water system descaling devices are required to thoroughly clean the dirt, reduce the impact of dirt thermal resistance on the chiller, and avoid energy waste.

[0131] S246: If the first deviation value is greater than or equal to the first preset deviation value and less than the second preset deviation value, send a self-cleaning maintenance signal.

[0132] If the first deviation value is greater than or equal to the first preset deviation value and less than the second preset deviation value, the surface water-cooled unit is affected by the dirt thermal resistance, but the impact is small. It can be cleaned by the online cleaning device of the chiller, cleaned by the online chemical dosing device, and self-cleaning maintenance such as increasing the water flow rate to impact dirt precipitation to reduce the impact of the dirt thermal resistance on the chiller.

[0133] In the above implementation process, the situation where the first deviation value is greater than or equal to the first preset deviation value is further divided into two situations, so that self-cleaning maintenance is performed when the first deviation value is small, and physical maintenance is performed when the first deviation value is large, which can avoid wasting manpower and material resources and achieve more efficient maintenance effects.

[0134] Please see Figure 3 , Figure 3 A flow chart of another chiller maintenance method provided in an embodiment of the present application. Optionally, the chiller maintenance method may further include:

[0135] S310: Obtain a second standard heat exchange effect curve of the refrigerant in the chiller at different concentrations.

[0136] Optionally, the second standard heat exchange effect curve is pre-stored data corresponding to the type of brine, or the second standard heat exchange effect curve is obtained by statistics or learning based on data obtained in the past for the same type of brine.

[0137] S320: Compare the second standard heat exchange effect curve with the heat exchange effect curve to obtain a second deviation value between the second standard heat exchange effect curve and the heat exchange effect curve.

[0138] Optionally, the second deviation value is the deviation amplitude between the second standard heat exchange effect curve and the heat exchange effect curve, for example, the difference between the slope of the second standard heat exchange effect curve and the slope of the heat exchange effect curve, or the difference between the intercept of the second standard heat exchange effect curve and the intercept of the heat exchange effect curve.

[0139] S330. Obtain a concentration value of the coolant according to the second deviation value.

[0140] In the above implementation process, the concentration value of the brine is calculated by the heat exchange effect curve, which can save the installation of the brine concentration meter, make the overall structure of the chiller simpler, and reduce the equipment preparation and installation costs.

[0141] S340: Determine whether the concentration of the coolant is less than a first preset concentration.

[0142] Optionally, the first preset concentration value is pre-stored data, or the first preset concentration value is obtained by statistics or learning based on previously acquired data.

[0143] S351. If the concentration value of the brine is less than the first preset concentration value, the mass or capacity of the brine to be replenished is obtained according to the concentration value of the brine and the target concentration value.

[0144] Optionally, the target concentration value is pre-stored data, or the target concentration value is obtained by statistics or learning based on previously acquired data.

[0145] Optionally, the mass or capacity of the brine to be replenished can be obtained by multiplying the difference between the concentration value of the brine and the target concentration value by the total mass or total capacity of the brine.

[0146] In the above implementation process, the mass or capacity of the brine to be replenished is obtained by comparing the obtained concentration value of the brine with the target concentration value, so that the brine can be accurately replenished.

[0147] S352: Send a signal to replenish the refrigerant.

[0148] Optionally, the signal for replenishing the brine may include the mass or volume of the brine to be replenished, so that the brine can be added according to the signal for replenishing the brine.

[0149] S360: If the concentration value of the brine is greater than or equal to the first preset concentration value, determine whether the concentration value of the brine is less than or equal to the second preset concentration value.

[0150] Optionally, the second preset concentration value is pre-stored data, or the second preset concentration value is obtained by statistics or learning based on previously acquired data.

[0151] S370: If the concentration value of the brine is less than or equal to the second preset concentration value, it is determined that the chiller is operating normally, and the concentration value of the brine is sent.

[0152] S381. If the concentration value of the brine is greater than the second preset concentration value, the mass or capacity of the brine to be recovered is obtained according to the concentration value of the brine and the target concentration value.

[0153] Optionally, the mass or capacity of the brine to be recovered can be obtained by multiplying the difference between the concentration value of the brine and the target concentration value by the total mass or total capacity of the brine.

[0154] In the above implementation process, the mass or capacity of the brine to be recovered is obtained by comparing the obtained brine concentration value with the target concentration value, so that the brine can be accurately recovered.

[0155] S382. Send a signal to recover the refrigerant.

[0156] Optionally, the signal for replenishing the brine may include the mass or volume of the brine to be recovered, so that the brine can be recovered according to the signal for recovering the brine.

[0157] In the above implementation process, by replenishing or recycling the refrigerant in the chiller according to the concentration value of the refrigerant, the real-time concentration value of the refrigerant in the chiller can be controlled to avoid waste of refrigerant, save the cost of refrigerant, and make the energy-saving effect of the chiller better, which is beneficial to environmental protection.

[0158] Optionally, the chiller maintenance method may further include: re-collecting heat exchange effect data of the brine after a second preset cycle time, and determining whether the brine needs to be replenished or recovered.

[0159] Optionally, the second preset cycle time may be set by a user, or may be obtained by statistics or learning based on previously acquired second preset cycle times.

[0160] Please see Figure 4 , Figure 4A schematic diagram of the structure of a chiller maintenance device provided in an embodiment of the present application. The chiller maintenance device 400 includes a transceiver 410 and a processor 420. The transceiver 410 is used to obtain a first standard heat exchange effect curve of a refrigerant in the chiller and obtain heat exchange effect data of the refrigerant. The processor 420 is connected to the transceiver 410 and is used to generate a heat exchange effect curve of the refrigerant based on the heat exchange effect data, compare the first standard heat exchange effect curve with the heat exchange effect curve, and send a maintenance signal or a signal indicating that the chiller is operating normally based on the comparison result.

[0161] In the above implementation process, by collecting the heat exchange effect data of the refrigerant, generating the heat exchange effect curve of the refrigerant according to the heat exchange effect data, and comparing the collected heat exchange effect curve with the first standard heat exchange effect curve, so as to send a maintenance signal or a signal that the chiller is operating normally according to the comparison result, the intelligent generation of the heat exchange effect curve of the refrigerant can be realized, so that the comparison result with the first standard heat exchange effect curve is more accurate, and thus more precise maintenance or dirt cleaning of the chiller can be achieved, which can improve the energy-saving effect of the system, avoid energy waste, and is beneficial to energy saving and environmental protection.

[0162] Please see Figure 5 , Figure 5 Schematic diagram of a device with a storage function provided in an embodiment of the present application. The device with a storage function 500 stores program data 510, which can be executed to implement the above-mentioned chiller maintenance method.

[0163] In the above implementation process, by collecting the heat exchange effect data of the refrigerant, generating the heat exchange effect curve of the refrigerant according to the heat exchange effect data, and comparing the collected heat exchange effect curve with the first standard heat exchange effect curve, so as to send a maintenance signal or a signal that the chiller is operating normally according to the comparison result, the intelligent generation of the heat exchange effect curve of the refrigerant can be realized, so that the comparison result with the first standard heat exchange effect curve is more accurate, and thus more precise maintenance or dirt cleaning of the chiller can be achieved, which can improve the energy-saving effect of the system, avoid energy waste, and is beneficial to energy saving and environmental protection.

[0164] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0165] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0166] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0167] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0168] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0169] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A method for maintaining a chiller, characterized in that: include: Obtaining a first standard heat exchange effect curve of a refrigerant in a chiller; Collecting heat exchange effect data of the coolant; generating a heat exchange effect curve of the brine according to the heat exchange effect data; comparing the first standard heat exchange effect curve with the heat exchange effect curve to obtain a first deviation value between the first standard heat exchange effect curve and the heat exchange effect curve; Determining whether the first deviation value is greater than or equal to a first preset deviation value; If the first deviation value is greater than or equal to a first preset deviation value, determining whether the first deviation value is greater than or equal to a second preset deviation value; If the first deviation value is greater than or equal to a second preset deviation value, sending a physical maintenance signal; If the first deviation value is less than a second preset deviation value, sending a self-cleaning maintenance signal; If the first deviation value is less than a first preset deviation value, a signal indicating that the chiller is operating normally is sent.

2. The method according to claim 1, characterized in that The method for obtaining the first standard heat exchange effect curve of the brine in the chiller includes: Obtaining the type of the coolant; The first standard heat exchange effect curve is determined according to the type of the secondary refrigerant.

3. The method according to claim 1, characterized in that Before collecting the heat exchange effect data of the brine, the method further includes: Control the operating data of the chiller so that the chiller is in a stable state.

4. The method according to claim 3, characterized in that The method of controlling the operating data of the chiller so that the chiller is in a stable state and collecting the heat exchange effect data of the brine includes: Controlling the energy regulation of the chiller, and the evaporation saturation temperature and condensation saturation temperature of the chiller to remain stable; Determine whether the energy adjustment of the chiller is within a preset energy adjustment range, whether the evaporation saturation temperature is within a first preset temperature range, and whether the condensation saturation temperature is within a second preset temperature range; If the energy adjustment of the chiller is within the preset energy adjustment range, the evaporation saturation temperature is within the first preset temperature range, and the condensation saturation temperature is within the second preset temperature range, controlling the water pump of the chiller to perform variable flow operation; Determine whether the water temperature fluctuation amplitude at different flow rates of the water pump is within a preset water temperature fluctuation amplitude range; If the water temperature fluctuation amplitude under different flow rates of the water pump is within a preset water temperature fluctuation amplitude range, the heat exchange effect data of the brine is collected.

5. The method according to claim 4, characterized in that The method for controlling the water pump of the chiller to perform variable flow operation includes: Obtaining the flow value of the water pump through the refrigerant flow meter in the chiller; The flow rate of the water pump is adjusted according to the flow rate value of the water pump.

6. The method according to claim 4, characterized in that The method for controlling the water pump of the chiller to perform variable flow operation includes: Obtaining the output load and water temperature difference of the chiller; Performing flow simulation of the water pump according to the output load and the water temperature difference; Acquiring a flow rate value of the water pump according to a flow rate simulation of the water pump; The flow rate of the water pump is adjusted according to the flow rate value of the water pump.

7. The method according to claim 1, characterized in that The first deviation value is a difference between a slope of the first standard heat exchange effect curve and a slope of the heat exchange effect curve, or a difference between an intercept of the first standard heat exchange effect curve and an intercept of the heat exchange effect curve.

8. The method according to claim 1, characterized in that Also includes: Obtain the second standard heat exchange effect curve of the refrigerant in the chiller at different concentrations; comparing the second standard heat exchange effect curve with the heat exchange effect curve to obtain a second deviation value between the second standard heat exchange effect curve and the heat exchange effect curve; The concentration value of the brine is obtained according to the second deviation value.

9. The method according to claim 8, characterized in that After obtaining the concentration value of the brine according to the second deviation value, the method further includes: Determining whether the concentration value of the brine is less than a first preset concentration value; If the concentration value of the brine is less than the first preset concentration value, sending a signal to replenish the brine; If the concentration value of the brine is greater than or equal to the first preset concentration value, determining whether the concentration value of the brine is less than or equal to a second preset concentration value; If the concentration value of the brine is less than or equal to a second preset concentration value, it is determined that the chiller is operating normally, and the concentration value of the brine is sent; If the concentration value of the brine is greater than the second preset concentration value, a signal for recovering the brine is sent.

10. The method according to claim 9, characterized in that Before sending the signal for replenishing the brine, the method further includes: obtaining the mass or volume of the brine to be replenished according to the concentration value and the target concentration value of the brine; Before sending the signal for recovering the brine, the method further includes: obtaining the mass or capacity of the brine to be recovered according to the concentration value and the target concentration value of the brine.

11. A maintenance device for a chiller, characterized in that: include: A transceiver, configured to obtain a first standard heat exchange effect curve of a brine in a chiller and obtain heat exchange effect data of the brine; A processor, connected to the transceiver, is used to generate a heat exchange effect curve of the refrigerant based on the heat exchange effect data, compare the first standard heat exchange effect curve with the heat exchange effect curve to obtain a first deviation value between the first standard heat exchange effect curve and the heat exchange effect curve; judge whether the first deviation value is greater than or equal to a first preset deviation value; if the first deviation value is greater than or equal to the first preset deviation value, judge whether the first deviation value is greater than or equal to a second preset deviation value; if the first deviation value is greater than or equal to the second preset deviation value, send a physical maintenance signal through the transceiver; if the first deviation value is less than the second preset deviation value, send a self-cleaning maintenance signal through the transceiver; if the first deviation value is less than the first preset deviation value, send a signal through the transceiver indicating that the chiller is operating normally.

12. A device with a storage function, characterized in that: Program data is stored, and the program data can be executed to implement the method according to any one of claims 1 to 10.

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