CN115164384A - Energy-saving control system and control method for central air-conditioning water system - Google Patents
Energy-saving control system and control method for central air-conditioning water system Download PDFInfo
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- CN115164384A CN115164384A CN202210821406.0A CN202210821406A CN115164384A CN 115164384 A CN115164384 A CN 115164384A CN 202210821406 A CN202210821406 A CN 202210821406A CN 115164384 A CN115164384 A CN 115164384A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to an energy-saving control system of a central air-conditioning water system and a control method thereof, wherein the system comprises a controller, a frequency converter, a switch element, a water circulation module and a detection assembly which are sequentially connected, wherein the water circulation module comprises a chilled water circulation submodule and a cooling water circulation submodule; the detection assembly comprises a first detection element and a second detection element, wherein the first detection element is used for detecting the return water temperature of the chilled water in the chilled water circulation submodule, and the second detection element is used for detecting the outlet water temperature of the cooling water in the cooling water circulation submodule. The energy-saving control system of the central air-conditioning water system detects the return water temperature and the outlet water temperature of the water circulation module through the detection assembly, adjusts the rotating speed of a driving source of the water circulation module according to the temperature by matching the fuzzy PID of the controller and the genetic algorithm with the frequency conversion technology of the frequency converter, and adjusts the flow rate of the circulating water in the water circulation module, so that the central air-conditioning system can supply cold air according to actual requirements, and the central air-conditioning system has better energy-saving control and operation effects.
Description
Technical Field
The invention relates to the technical field of air conditioner energy-saving control, in particular to an energy-saving control system of a central air conditioner water system and a control method thereof.
Background
Nowadays, the central air conditioner is widely applied to various large places and thousands of households, but the problem of large power consumption of the central air conditioner also occurs. According to the statistical data of investigation, the power consumption of the central air conditioner is as high as 32% -62% of all the total power consumption of each household, and even possibly exceeds the number, so that the air conditioner consumes large energy.
At present, 70% of the running time of various types of central air conditioners on the market runs below 50% of the set load, and in the running time of the air conditioners, the central air conditioners can not change the speed of a pump and a fan according to the change of the actual load, can be stably run at full speed at power frequency for a long time, and can increase the load of the pump of the air conditioner, consume huge energy and also cause adverse effects on the service life of the central air conditioner. It can also be understood that the water system of the central air conditioner consumes more energy when operating in a constant flow state; when the requirement of a water system of the central air conditioner on cooling capacity changes, a water pump of the central air conditioner always runs at full speed according to a design working condition, and water flow cannot change along with the actual load requirement, so that the energy consumption of water pump conveying of the central air conditioner is huge.
Disclosure of Invention
The embodiment of the invention provides an energy-saving control system of a central air-conditioning water system and a control method thereof, which are used for solving the technical problems that the existing central air-conditioning operates under a certain power frequency or constant flow state, and the control mode has high energy consumption and high energy consumption waste.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
an energy-saving control system of a central air-conditioning water system comprises a controller, a frequency converter, a switch element, a water circulation module and a detection assembly which are sequentially connected, wherein the controller is also connected with the switch element, the detection assembly is also connected with the controller, and the water circulation module comprises a chilled water circulation submodule and a cooling water circulation submodule; the detection assembly comprises a first detection element and a second detection element, wherein the first detection element is used for detecting the return water temperature of the chilled water in the chilled water circulation sub-module, and the second detection element is used for detecting the outlet water temperature of the cooling water in the cooling water circulation sub-module;
the controller is used for comparing the temperatures detected by the first detection element and the second detection element with a set value to obtain temperature data; the operation of the chilled water circulation sub-module and the cooling water circulation sub-module is correspondingly controlled through the frequency converter and the switch element in a mode of combining fuzzy PID (proportion integration differentiation) and a genetic algorithm according to temperature data;
the frequency converter is used for adjusting the running rotating speed of a driving source in the chilled water circulation submodule and the cooling water circulation submodule in real time according to the temperature detected by the first detection element and the second detection element;
the switch element is used for disconnecting or connecting the frequency converter and/or the controller with the water circulation module.
Preferably, the refrigerated water circulation submodule includes freezing driving source, evaporimeter and coil pipe of connecting gradually, freezing driving source respectively with the converter with the coil pipe is connected, freezing driving source with be provided with the refrigerated water pipeline that is used for carrying the refrigerated water return water between the coil pipe, first detecting element is installed realize detecting the temperature of refrigerated water return water on the refrigerated water pipeline, the refrigerated water circulation submodule passes through the drive of coil pipe driving source the coil pipe is carried the refrigerated water return water back among the freezing driving source.
Preferably, the cooling water circulation submodule includes cooling driving source, condenser and cooling tower that connects gradually, the cooling driving source respectively with the converter with the cooling tower is connected, the cooling driving source with be provided with the cooling water pipeline that is used for carrying the cooling water return water between the cooling tower, the second detecting element is installed realize detecting the temperature of cooling water return water on the cooling water pipeline, the cooling water circulation submodule passes through the drive of cooling tower driving source the cooling tower carries the cooling water return water back to in the cooling driving source.
Preferably, the energy-saving control system of the central air-conditioning water system comprises an analog input module and an analog output module, wherein the analog input module is arranged between the controller and the detection component, and the analog output module is arranged between the controller and the frequency converter.
Preferably, the first detection element and the second detection element are temperature sensors.
Preferably, the controller is a PLC controller having PID control.
Preferably, the switching element is a contactor.
The invention also provides an energy-saving control method of the central air-conditioning water system, which is applied to the energy-saving control system of the central air-conditioning water system and comprises the following steps:
acquiring the outlet water temperature of cooling water and the return water temperature of chilled water in real time through a detection component of an energy-saving control system of the central air-conditioning water system;
judging the outlet water temperature of the cooling water and the return water temperature of the chilled water based on preset conditions to obtain a judgment result; and controlling the operation of a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of the central air-conditioning water system according to the judgment result.
Preferably, the outlet water temperature of the cooling water and the return water temperature of the chilled water are judged based on preset conditions to obtain judgment results; and controlling the operation of a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of the central air-conditioning water system according to the judgment result comprises the following steps:
if the judgment result is that the return water temperature of the chilled water is greater than a first temperature set value, controlling the rotating speed of a freezing driving source in the chilled water circulation submodule to increase so as to increase the supply of cold air for the central air conditioner;
if the judgment result is that the return water temperature of the chilled water is lower than a first temperature set value, controlling the rotating speed of a freezing driving source in the chilled water circulation submodule to be reduced and controlling the output frozen water quantity to be reduced so as to reduce the supply of cold air for the central air conditioner;
if the judgment result is that the temperature of the cooling water outlet water is greater than a second temperature set value, controlling the rotating speed of a cooling driving source in the cooling water circulation submodule to increase, and increasing the water flow in the cooling water circulation submodule;
and if the judgment result is that the outlet water temperature of the cooling water is less than a second temperature set value, controlling the rotating speed of a cooling driving source in the cooling water circulation submodule to be reduced, and reducing the water flow in the cooling water circulation submodule.
Preferably, the controlling the operation of the freezing water circulation submodule and the cooling water circulation submodule in the energy-saving control system of the central air-conditioning water system according to the judgment result comprises: and according to the judgment result, controlling the frequency output by the frequency converter to increase or decrease by adopting a mode of combining a fuzzy PID (proportion integration differentiation) and a genetic algorithm by a controller of the energy-saving control system of the central air-conditioning water system, so as to control the rotating speed of a cooling driving source in the cooling water circulation submodule and the rotating speed of a freezing driving source in the freezing water circulation submodule, and adjust the circulating water flow of a book circulation module in the energy-saving control system of the central air-conditioning water system.
According to the technical scheme, the embodiment of the invention has the following advantages: the system comprises a controller, a frequency converter, a switch element, a water circulation module and a detection assembly which are sequentially connected, wherein the controller is also connected with the switch element, the detection assembly is also connected with the controller, and the water circulation module comprises a chilled water circulation submodule and a cooling water circulation submodule; corresponding to the chilled water circulation submodule and the cooling water circulation submodule, the detection assembly comprises a first detection element and a second detection element, the first detection element is used for detecting the return water temperature of the chilled water in the chilled water circulation submodule, and the second detection element is used for detecting the outlet water temperature of the cooling water in the cooling water circulation submodule. The energy-saving control system of the central air-conditioning water system detects the return water temperature and the outlet water temperature of the water circulation module through the detection assembly, adjusts the rotating speed of a driving source of the water circulation module according to the temperature by matching the fuzzy PID of the controller and the genetic algorithm with the frequency conversion technology of the frequency converter, and realizes the adjustment of the flow rate of the circulating water in the water circulation module, so that the central air-conditioning system can supply cold air according to actual requirements, the central air-conditioning system has better energy-saving control and operation effects, and the technical problems that the existing central air-conditioning system runs at a certain power frequency or constant flow state, the control mode consumes large energy and wastes large energy are solved.
The energy-saving control system of the central air-conditioning water system has the advantages that the performance of the central air-conditioning water system in the aspects of energy saving, response time, safe operation and the like is more excellent than that of a common PID control mode, the operation of the central air-conditioning water system can be effectively controlled, the central air-conditioning water system can be operated efficiently, the energy consumption is reduced, the purposes of energy saving and emission reduction are achieved, and the strategic target of sustainable development of the current market is also met. The energy-saving control system of the central air-conditioning water system can reduce noise, improve the comfort level of a cold air supply space of the central air conditioner, further comprehensively improve and optimize the performance of the central air conditioner, optimize the efficiency of the central air conditioner and prolong the service life of a water circulation module driving source. In addition, the energy-saving control system of the central air-conditioning water system has obvious energy-saving control effect, can reduce the operation cost of a user and improve the economic benefit of the user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a framework of an energy-saving control system of a central air-conditioning water system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a freezing water circulation submodule in the energy-saving control system of the central air-conditioning water system according to the embodiment of the invention;
FIG. 3 is a schematic diagram of a cooling water circulation submodule in the energy-saving control system of the central air-conditioning water system according to the embodiment of the invention;
FIG. 4 is a schematic diagram of a frame of an energy-saving control system of a central air-conditioning water system according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a central air-conditioning water system in an energy-saving control system of a central air-conditioning water system according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating steps of a method for controlling energy conservation of a central air-conditioning water system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The application provides an energy-saving control system of a central air-conditioning water system and a control method thereof, which are used for solving the technical problems that the existing central air-conditioning operates at a certain power frequency or constant flow, the control mode has high energy consumption and high energy consumption waste.
The first embodiment is as follows:
fig. 1 is a schematic diagram of a framework of an energy-saving control system of a central air-conditioning water system according to an embodiment of the present invention.
As shown in fig. 1, the present invention provides an energy saving control system of a central air-conditioning water system, comprising a controller 10, a frequency converter 20, a switch element 30, a water circulation module 40 and a detection assembly 50, which are connected in sequence, wherein the controller 10 is further connected with the switch element 30, the detection assembly 50 is further connected with the controller 10, and the water circulation module 40 comprises a chilled water circulation submodule 41 and a cooling water circulation submodule 42; corresponding to the chilled water circulation submodule 41 and the cooling water circulation submodule 42, the detection assembly 50 includes a first detection element 51 for detecting the return water temperature of the chilled water in the chilled water circulation submodule 41 and a second detection element 52 for detecting the outlet water temperature of the cooling water in the cooling water circulation submodule 42.
The first detection element 51 and the second detection element 52 may be temperature sensors, and the switching element 30 may be a contactor.
In the embodiment of the present invention, the controller 10 may be configured to obtain temperature data according to the comparison between the temperatures detected by the first detecting element 51 and the second detecting element 52 and a set value; and correspondingly controlling the operation of a freezing water circulation submodule 41 and a cooling water circulation submodule 42 through the frequency converter 20 and the switching element 30 according to the temperature data in a mode of combining fuzzy PID and a genetic algorithm. Wherein the set point comprises a first temperature set point and a second temperature set point.
It should be noted that the controller 10 may preferably be a PLC controller having PID control. In this embodiment, the PLC controller is an S7-200 series controller of siemens, and the controller has a relatively high function and a very high performance-to-price ratio. The S7-200 series PLC controller has the following advantages: firstly, the instruction is comprehensive and comprises a timer, PID control, a character string instruction, a communication instruction and the like; secondly, the communication function is strong, PPI communication between the PLCs of the same type is supported, MPI communication can be carried out with other large PLCs, and the development trend of modern automation is met; thirdly, programming is very convenient, STEP7 software can be used, program compiling, program monitoring and development environments are integrated, an operation interface is simple and clear, and the use is convenient. The combination of fuzzy PID and genetic algorithm is a mature technology, such as cooperative temperature control of deep deterministic strategy gradient and fuzzy PID, published by Wumin et al 6.6.6.2022.
In the embodiment of the present invention, the frequency converter 20 may be used to adjust the operation rotation speed of the driving source in the chilled water circulation sub-module 41 and the cooling water circulation sub-module 42 in real time according to the temperatures detected by the first and second detection elements 51 and 52.
In an embodiment of the present invention, the switching element 30 may be used to disconnect or connect the frequency converter 20 and/or the controller 10 with the water circulation module 40.
In the embodiment of the present invention, the energy-saving control system of the central air-conditioning water system detects the temperature of the circulating water in the water circulation module 40 through the detection component 50, compares the temperature of the circulating water with a corresponding temperature set value to obtain the difference value between the temperature of the circulating water and the corresponding temperature set value, then transmits the difference value to the controller 10, converts the difference value into an analog quantity after fuzzy PID operation optimized by a genetic algorithm in the controller 10, and transmits the analog quantity to the frequency converter 20 to control the increase and decrease of the frequency converter 20, and then uses the switch element 30 to realize the control of the speed of the driving source in the chilled water circulation submodule 41 and the cooling water circulation submodule 42 and adjust the flow rate of the circulating water in the water circulation module 40.
It should be noted that, the energy-saving control system of the central air-conditioning water system adopts the frequency converter to adjust the rotating speed of the driving source of the water circulation module in the central air-conditioning water system, so that the water circulation module can run efficiently, and the purposes of energy conservation and consumption reduction are achieved. In addition, an energy-saving control strategy combining a frequency conversion technology and a fuzzy PID control mode optimized by a genetic algorithm has a better effect on energy-saving control of a central air-conditioning water system, so that energy can be greatly saved, the starting characteristic and the running characteristic of the central air-conditioning water system are greatly improved, and after the frequency is reduced, the water circulation module driving source avoids long-term high-speed running, so that the service life of the water circulation module driving source is effectively prolonged.
The invention provides an energy-saving control system of a central air-conditioning water system, which comprises a controller, a frequency converter, a switch element, a water circulation module and a detection assembly, wherein the controller, the frequency converter, the switch element, the water circulation module and the detection assembly are sequentially connected; corresponding to the chilled water circulation submodule and the cooling water circulation submodule, the detection assembly comprises a first detection element and a second detection element, the first detection element is used for detecting the return water temperature of the chilled water in the chilled water circulation submodule, and the second detection element is used for detecting the outlet water temperature of the cooling water in the cooling water circulation submodule. This energy-saving control system of central air conditioning water system detects the return water temperature and the leaving water temperature of hydrologic cycle module through the determine module, the rotational speed of hydrologic cycle module driving source is adjusted through the fuzzy PID of controller and the frequency conversion technology of genetic algorithm combination mode cooperation converter according to its temperature, realize adjusting the hydrologic cycle module well-defined water flow size, thereby let central air conditioning system can supply air conditioning according to actual demand, make central air conditioning system possess better energy-conserving control and operation effect, current central air conditioning has been solved and has been adopted to operate under certain power frequency or constant flow state, this control mode power consumption is big, the extravagant big technical problem of energy consumption. The method comprises the steps of converting the return water temperature and the outlet water temperature of a detected water circulation module, inputting the converted return water temperature and the outlet water temperature into a PLC (programmable logic controller), comparing the obtained comparison result with a corresponding temperature set value to obtain a comparison result, processing the comparison result by a fuzzy PID (proportion integration differentiation) controller optimized by a genetic algorithm, inputting the processed result into a frequency converter, and adjusting the rotating speed of a driving source of the water circulation module by matching with a frequency conversion technology of the frequency converter to realize the adjustment of the flow rate of circulating water in the water circulation module.
In the embodiment of the invention, the energy-saving control system of the central air-conditioning water system has better performance than the common PID control mode in the aspects of energy saving, response time, safe operation and the like, can effectively control the operation of the central air-conditioning water system, enables the central air-conditioning water system to operate efficiently, reduces energy consumption, achieves the aim of energy saving and emission reduction, and also accords with the target of the strategy of sustainable development of the current market. The energy-saving control system of the central air-conditioning water system can reduce noise, improve the comfort level of a cold air supply space of the central air conditioner, further comprehensively improve and optimize the performance of the central air conditioner, optimize the efficiency of the central air conditioner and prolong the service life of a water circulation module driving source. In addition, the energy-saving control system of the central air-conditioning water system has obvious energy-saving control effect, can reduce the operation cost of a user and improve the economic benefit of the user.
Fig. 2 is a schematic diagram of a framework of a chilled water circulation submodule in an energy-saving control system of a central air-conditioning water system according to an embodiment of the present invention.
As shown in fig. 2, in an embodiment of the present invention, the chilled water circulation sub-module 41 includes a freezing driving source 411, an evaporator 412 and a coil 413 which are sequentially connected, the freezing driving source 411 is respectively connected with the frequency converter 20 and the coil 413, a chilled water pipeline for conveying chilled water return water is disposed between the freezing driving source 411 and the coil 413, the first detection element 51 is mounted on the chilled water pipeline to detect a temperature of the chilled water return water, and the chilled water circulation sub-module 41 conveys the chilled water return water back to the freezing driving source 411 through the coil driving source driving coil.
It should be noted that the freezing driving source 411 may be a water pump, and the coil driving source may be a fan. The working principle of the chilled water circulation submodule 41 is as follows: the return temperature of the chilled water is first collected by the first detection element 51, and then the collected return temperature of the chilled water is compared with a first temperature setting value. If the return temperature of the chilled water is higher than the first temperature setting value, it indicates that the end load of the central air conditioner is increased, and at this time, the rotation speed of the chilled water driving source 411 should be increased, so that the central control can supply more cold air, and an ideal cooling effect is achieved. Similarly, if the return chilled water temperature is lower than the first temperature setting value, which indicates that the end load of the central air conditioner is reduced, the rotation speed of the chilled water driving source 411 needs to be reduced, the output flow and the output speed of the chilled water driving source 411 are reduced, and the central air conditioner is enabled to reduce the supplied cold air, so that the temperature control purpose is achieved.
Fig. 3 is a schematic diagram of a cooling water circulation sub-module in an energy-saving control system of a central air-conditioning water system according to an embodiment of the present invention.
As shown in fig. 3, in an embodiment of the present invention, the cooling water circulation submodule 42 includes a cooling driving source 421, a condenser 422 and a cooling tower 423 which are connected in sequence, the cooling driving source 421 is respectively connected with the frequency converter 20 and the cooling tower 423, a cooling water pipeline for conveying return cooling water is disposed between the cooling driving source 421 and the cooling tower 423, a second detection element 52 is installed on the cooling water pipeline to detect the temperature of the return cooling water, and the cooling water circulation submodule 42 drives the cooling tower 423 through the cooling tower driving source to convey the return cooling water back to the cooling driving source 421.
It should be noted that the cooling driving source 421 may be a water pump, and the cooling tower driving source may be a fan. The working principle of the cooling water circulation submodule 42 is as follows: when the outlet temperature of the cooling water detected by the second detection element 52 is higher than the second temperature setting value, it means that the heat transfer between the cooling water and the refrigerant in the condenser and the evaporator is fast, and the required load is increased. In this case, it is necessary to increase the frequency of the power supply of the central air conditioner to increase the rotation speed of the cooling drive source 421, thereby increasing the flow rate of water output from the cooling drive source 421. On the contrary, the frequency of the power supply of the central air conditioner needs to be reduced, and the rotating speed of the cooling driving source 421 needs to be reduced, so that the water flow output by the cooling driving source 421 is reduced; the flow of the cooling water in the central air-conditioning water system can just meet the optimal requirement of the system, thereby realizing high efficiency and energy saving.
Fig. 4 is a schematic diagram of a framework of an energy-saving control system for a central air-conditioning water system according to another embodiment of the present invention.
As shown in fig. 4, in an embodiment of the present invention, the energy saving control system of a central air-conditioning water system includes an analog input module 60 and an analog output module 70, wherein the analog input module 60 is disposed between the controller 10 and the detection assembly 50, and the analog output module 70 is disposed between the controller 10 and the inverter 20.
It should be noted that the analog input module 60 may be configured to convert the temperature signal detected by the detecting component 50 from an analog value to a digital signal and transmit the converted digital signal to the controller 10, and the analog output module 70 may be configured to convert the digital signal output by the controller 10 to an analog signal and transmit the analog signal to the frequency converter 20. In the present embodiment, the analog input module 60 may be selected as an a/D module of an EM231 model, and the analog output module 70 may be selected as a D/a module of an EM232 model.
Fig. 5 is a schematic structural diagram of a central air-conditioning water system in an energy-saving control system of the central air-conditioning water system according to an embodiment of the present invention.
In one embodiment of the invention, as shown in FIG. 5, chilled water circulation submodule 41 is connected to chilled water circulation submodule 42 by a throttle valve and a compressor, both of which are connected to the condenser and the evaporator, respectively.
The method comprises the following steps that firstly, a compressor is utilized to compress a normal-temperature low-pressure gaseous refrigerant which flows through an evaporator and has heat exchange into a high-temperature high-pressure gas, then the gas is transmitted into a condenser by the compressor to have heat exchange with cooling water flowing through the condenser, and then the gas is condensed into a high-pressure liquid refrigerant, and then the high-pressure liquid refrigerant is depressurized through a throttling valve and is reduced from the condensing pressure to the evaporating pressure; the throttle valve also needs to control the flow of the refrigerant according to the load change of the central air conditioner; the liquid refrigerant is then conveyed into the evaporator and exchanges heat with the normal-temperature water flowing through the evaporator, so that the temperature of the normal-temperature water is reduced to low-temperature chilled water, namely the cold source of the central air conditioner; the liquid refrigerant is changed into gaseous refrigerant after heat exchange, and then is absorbed by the compressor again, and the next refrigeration cycle is started. When the central air-conditioning water system operates, the chilled water circulation submodule pumps normal-temperature water into the evaporator through the freezing driving source and exchanges heat with the liquid refrigerant to form low-temperature chilled water, then the chilled water is sent to the coil pipe to exchange heat with surrounding air, the generated low-temperature air is used as cold air supply of the central air conditioner, the temperature of a cold air supply area of the central air conditioner is reduced, and therefore the purpose of cooling is achieved. The temperature of the chilled water from the coil driving source is reduced to normal temperature water, the chilled water is pumped into the evaporator through the freezing driving source again to exchange heat with the refrigerant, and then the next cycle of the chilled water is started again. When the central air conditioner starts to operate, the cooling water circulation submodule pumps normal-temperature water into the condenser through the cooling driving source and exchanges heat with gaseous refrigerant, the temperature of the normal-temperature water can rise after the heat exchange is completed, then the cooling water with the rising temperature can be sent into the cooling tower to be cooled, and the cooling speed of the cooling water is accelerated through the cooling tower driving source. In the cooling process, high-temperature cooling water exchanges heat with air to be changed into normal-temperature water, the high-temperature cooling water is pumped into the condenser through the cooling driving source to exchange heat with the refrigerant, and then the next circulation of the cooling water is started.
In the embodiment of the present invention, the energy-saving control system of the central air-conditioning water system further includes a display module connected to the controller 10, and the display module is used for displaying the operation parameters (such as temperature, time, etc.) of the central air-conditioning water system.
In the embodiment of the present invention, the display module may be a display screen.
The second embodiment:
fig. 6 is a flowchart illustrating steps of a method for controlling energy conservation of a central air-conditioning water system according to an embodiment of the present invention.
As shown in fig. 6, the present invention further provides an energy saving control method for a central air-conditioning water system, which is applied to the energy saving control system for a central air-conditioning water system, and the energy saving control method comprises the following steps:
and S10, acquiring the outlet water temperature of the cooling water and the return water temperature of the chilled water in real time through a detection component of an energy-saving control system of a central air-conditioning water system.
It should be noted that, in step S10, the outlet water temperature and the return water temperature of the chilled water can be detected in real time by the detection component of the energy-saving control system of the central air-conditioning water system, so as to facilitate the controller of the energy-saving control system of the central air-conditioning water system to adjust the water circulation module.
S20, judging the outlet water temperature of the cooling water and the return water temperature of the chilled water based on preset conditions to obtain a judgment result; and controlling the operation of a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of the central air-conditioning water system according to the judgment result.
It should be noted that, in step S20, the detected energy-saving control systems of the central air-conditioning water system can be respectively determined one by one according to the preset conditions, and the operations of the chilled water circulation sub-module and the cooling water circulation sub-module are automatically adjusted according to the determination results, so as to adjust the cold air supply of the central air-conditioner and enable the central air-conditioner to achieve the purpose of saving energy consumption. In this embodiment, the preset conditions include whether the outlet water temperature of the chlorine cooling water is lower than a first temperature set value of the preset conditions, whether the return water temperature of the chilled water is higher than a second temperature set value of the preset conditions, and the like.
In the embodiment of the invention, the outlet water temperature of the cooling water and the return water temperature of the chilled water are judged based on preset conditions to obtain a judgment result; and controlling the operation of a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of the central air-conditioning water system according to the judgment result, wherein the operation comprises the following steps:
if the judgment result is that the return water temperature of the chilled water is greater than the first temperature set value, controlling the rotating speed of a freezing driving source in the chilled water circulation submodule to increase so as to increase the supply of cold air to the central air conditioner;
if the judgment result is that the return water temperature of the chilled water is lower than the first temperature set value, controlling the rotation speed of a freezing driving source in the chilled water circulation submodule to be reduced and the output chilled water amount to be reduced so as to reduce the supply of cold air for the central air conditioner;
if the judgment result is that the temperature of the cooling water outlet is greater than the second temperature set value, controlling the rotating speed of a cooling driving source in the cooling water circulation submodule to increase, and increasing the water flow in the cooling water circulation submodule;
and if the judgment result is that the outlet water temperature of the cooling water is less than the second temperature set value, controlling the rotating speed of the cooling driving source in the cooling water circulation submodule to be reduced, and reducing the water flow in the cooling water circulation submodule.
In an embodiment of the present invention, the energy saving control method of a central air conditioning water system further includes:
controlling the operation of a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of a central air-conditioning water system according to a judgment result comprises the following steps: and according to the judgment result, the controller of the energy-saving control system of the central air-conditioning water system controls the frequency output by the frequency converter to increase or decrease in a mode of combining a fuzzy PID (proportion integration differentiation) and a genetic algorithm, so that the rotating speed of a cooling driving source in the cooling water circulation submodule and the rotating speed of a freezing driving source in the freezing water circulation submodule are controlled, and the circulating water flow of a book circulation module in the energy-saving control system of the central air-conditioning water system is adjusted.
It should be noted that, in the second control method of the embodiment, the content of the energy-saving control system of the central air-conditioning water system has already been explained in detail in the first embodiment, and the content of the energy-saving control system of the central air-conditioning water system is not repeated in the second embodiment. The first temperature setting value and the second temperature setting value in the second embodiment may be set according to the requirement, and are not limited in detail here.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is substantially or partly contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The energy-saving control system of the central air-conditioning water system is characterized by comprising a controller, a frequency converter, a switch element, a water circulation module and a detection assembly which are sequentially connected, wherein the controller is also connected with the switch element, the detection assembly is also connected with the controller, and the water circulation module comprises a chilled water circulation submodule and a cooling water circulation submodule; the detection assembly comprises a first detection element and a second detection element, the first detection element is used for detecting the return water temperature of the chilled water in the chilled water circulation submodule, and the second detection element is used for detecting the outlet water temperature of the cooling water in the cooling water circulation submodule;
the controller is used for obtaining temperature data after comparing the temperatures detected by the first detection element and the second detection element with a set value; the operation of the chilled water circulation sub-module and the cooling water circulation sub-module is correspondingly controlled through the frequency converter and the switch element in a mode of combining fuzzy PID (proportion integration differentiation) and a genetic algorithm according to temperature data;
the frequency converter is used for adjusting the running rotating speed of a driving source in the chilled water circulation submodule and the cooling water circulation submodule in real time according to the temperature detected by the first detection element and the second detection element;
the switch element is used for disconnecting or connecting the frequency converter and/or the controller with the water circulation module.
2. The energy-saving control system of a central air-conditioning water system according to claim 1, wherein the chilled water circulation sub-module comprises a chilled driving source, an evaporator and a coil pipe which are sequentially connected, the chilled driving source is respectively connected with the frequency converter and the coil pipe, a chilled water pipeline for conveying chilled water return water is arranged between the chilled driving source and the coil pipe, the first detection element is installed on the chilled water pipeline to detect the temperature of the chilled water return water, and the chilled water circulation sub-module drives the coil pipe through the coil pipe driving source to convey the chilled water return water back to the chilled driving source.
3. The energy-saving control system of a central air-conditioning water system as claimed in claim 1, wherein the cooling water circulation submodule comprises a cooling driving source, a condenser and a cooling tower which are connected in sequence, the cooling driving source is respectively connected with the frequency converter and the cooling tower, a cooling water pipeline for conveying return cooling water is arranged between the cooling driving source and the cooling tower, the second detection element is mounted on the cooling water pipeline to detect the temperature of the return cooling water, and the cooling water circulation submodule drives the cooling tower through the cooling tower driving source to convey the return cooling water back to the cooling driving source.
4. The energy-saving control system of a central air-conditioning water system as claimed in claim 1, which comprises an analog input module and an analog output module, wherein the analog input module is arranged between the controller and the detection component, and the analog output module is arranged between the controller and the frequency converter.
5. The energy-saving control system of a central air-conditioning water system as claimed in claim 1, wherein the first and second detecting elements are temperature sensors.
6. The energy-saving control system of a central air-conditioning water system as claimed in claim 1, wherein the controller is a PLC controller having PID control.
7. The energy-saving control system of a central air-conditioning water system as claimed in claim 1, wherein the switching element is a contactor.
8. An energy-saving control method of a central air-conditioning water system, which is applied to the energy-saving control system of the central air-conditioning water system according to any one of claims 1 to 7, and comprises the following steps:
acquiring the outlet water temperature of cooling water and the return water temperature of chilled water in real time through a detection component of an energy-saving control system of the central air-conditioning water system;
judging the outlet water temperature of the cooling water and the return water temperature of the chilled water based on preset conditions to obtain a judgment result; and controlling a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of the central air-conditioning water system to operate according to the judgment result.
9. The energy-saving control method of a water system of a central air-conditioning according to claim 8, characterized in that the judgment of the outlet water temperature of the cooling water and the return water temperature of the chilled water is carried out based on preset conditions to obtain a judgment result; and controlling the operation of a freezing water circulation submodule and a cooling water circulation submodule in an energy-saving control system of the central air-conditioning water system according to the judgment result comprises the following steps:
if the judgment result is that the return water temperature of the chilled water is greater than a first temperature set value, controlling the rotating speed of a freezing driving source in the chilled water circulation submodule to increase so as to increase the supply of cold air for the central air conditioner;
if the judgment result is that the return water temperature of the chilled water is lower than a first temperature set value, controlling the rotating speed of a freezing driving source in the chilled water circulation submodule to be reduced and controlling the output frozen water quantity to be reduced so as to reduce the supply of cold air for the central air conditioner;
if the judgment result is that the temperature of the cooling water outlet water is greater than a second temperature set value, controlling the rotating speed of a cooling driving source in the cooling water circulation submodule to increase, and increasing the water flow in the cooling water circulation submodule;
and if the judgment result is that the outlet water temperature of the cooling water is less than a second temperature set value, controlling the rotating speed of a cooling driving source in the cooling water circulation submodule to be reduced, and reducing the water flow in the cooling water circulation submodule.
10. The energy-saving control method of a central air-conditioning water system according to claim 8, wherein controlling the operation of the freezing water circulation submodule and the cooling water circulation submodule in the energy-saving control system of the central air-conditioning water system according to the judgment result comprises: and according to the judgment result, controlling the frequency output by the frequency converter to increase or decrease by adopting a mode of combining fuzzy PID and a genetic algorithm by the controller of the energy-saving control system of the central air-conditioning water system, so as to control the rotating speed of the cooling driving source in the cooling water circulation submodule and the rotating speed of the freezing driving source in the freezing water circulation submodule, and adjust the circulating water flow of the book circulation module in the energy-saving control system of the central air-conditioning water system.
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