CN117190442B - Double-compression water-cooling cabinet type multi-split air conditioner control system - Google Patents
Double-compression water-cooling cabinet type multi-split air conditioner control system Download PDFInfo
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Abstract
本发明提供一种双压缩水冷柜式多联机空调控制系统，涉及空调控制系统技术领域，包括：多个室内机，设置于室内；室内机控制器，设置于对应的所述室内机内，用于控制对应室内机的开启和调节；中央控制器，分别连接多个所述室内机控制器，实时监控多个室内机的运行参数以及对应的房间温度，根据负荷情况计算每个室内机的运行模式和制冷量，并控制各室内机控制器按照计算结果运行。本发明可以根据每个房间的负荷情况，动态计算和分配制冷量，实现负荷优化，根据负荷变化实时调整压缩机频率，提高能效。
The present invention provides a dual-compression water-cooled cabinet multi-split air-conditioning control system, which relates to the technical field of air-conditioning control systems, and includes: a plurality of indoor units, which are arranged indoors; an indoor unit controller, which is arranged in the corresponding indoor unit, and is used to control the opening and adjustment of the corresponding indoor unit; a central controller, which is respectively connected to the plurality of indoor unit controllers, monitors the operating parameters of the plurality of indoor units and the corresponding room temperature in real time, calculates the operating mode and cooling capacity of each indoor unit according to the load conditions, and controls each indoor unit controller to operate according to the calculated results. The present invention can dynamically calculate and allocate cooling capacity according to the load conditions of each room, realize load optimization, adjust the compressor frequency in real time according to load changes, and improve energy efficiency.
Description
Technical Field
The invention relates to the technical field of air conditioner control systems, in particular to a double-compression water-cooling cabinet type multi-split air conditioner control system.
Background
The traditional air conditioning system mostly adopts a single indoor unit layout, namely one outdoor unit is connected with one indoor unit, so that a large number of condensation pipelines are required to be paved under the requirement of a large-area air conditioner, the installation difficulty is increased, and the air conditioning efficiency is reduced. In order to solve the problems, a multi-split air conditioning system is provided, which is connected with a plurality of indoor units through an outdoor unit, thereby realizing centralized supply and scattered use of the air conditioner, reducing the installation difficulty and improving the air conditioning efficiency.
However, the existing multi-split air conditioning system has the following problems:
1. the system controls the dispersion of the control signals, scheduling cannot be comprehensively carried out, and energy efficiency is reduced;
2. the indoor units cannot exchange refrigerating capacity, so that load balance is difficult to realize;
3. centralized monitoring and management of indoor environments is lacking.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-compression water-cooling cabinet type multi-split air conditioner control system which can dynamically calculate and distribute refrigerating capacity according to the load condition of each room, realize load optimization, adjust the frequency of a compressor in real time according to load change and improve energy efficiency.
In order to solve the technical problems, the technical scheme of the invention is as follows:
A double-compression water-cooling cabinet type multi-split air conditioner control system, comprising:
the indoor units are arranged indoors;
the indoor unit controller is arranged in the corresponding indoor unit and used for controlling the opening and the adjustment of the corresponding indoor unit;
The central controller is respectively connected with the indoor unit controllers, monitors the operation parameters of the indoor units and the corresponding room temperature in real time, calculates the operation mode and the refrigerating capacity of each indoor unit according to the load condition, and controls the indoor unit controllers to operate according to the calculation results.
Further, each outdoor unit is internally provided with a compressor, an electronic expansion valve and a four-way reversing valve, the indoor unit controller comprises a main control chip, a driving module and a sensor module, the main control chip receives a control instruction of the central controller and transmits the control instruction to the driving module, the driving module is connected with the electronic expansion valve, the fan and the indoor heat exchanger and used for controlling the opening and the adjustment of the electronic expansion valve, the fan and the indoor heat exchanger, and the sensor module is used for detecting indoor environment parameters in real time and feeding back the indoor environment parameters to the main control chip.
Further, the main control chip includes:
The target temperature determining module receives a target temperature value instructed by the central controller;
The target humidity determining module receives a target humidity value instructed by the central controller;
The temperature PID control module calculates the opening value of the electronic expansion valve according to the target temperature and the current temperature fed back by the sensor module, and sends the opening value of the electronic expansion valve to the driving module;
and the humidity PID control module is used for calculating a fan rotating speed value according to the target humidity and the current humidity fed back by the sensor module and sending the fan rotating speed value to the driving module, and the driving module is used for respectively driving the electronic expansion valve and the fan to operate according to the received opening value and the rotating speed value.
Further, the driving module includes:
The digital-analog converter is used for converting the received opening value and the rotating speed value into corresponding voltage or current signals;
And the driving circuit amplifies the voltage or current signal output by the digital-analog converter and drives the electronic expansion valve and the blower according to the voltage or current signal.
Further, the central controller includes:
the receiving module is used for receiving the room temperature and humidity parameters fed back by the indoor unit controllers;
The calculation module is used for calculating the load condition and the operation mode of each room according to the room temperature and the humidity parameters fed back by the receiving module and combining with a preset comfort degree model, and determining the target temperature, the target humidity and the refrigerating capacity of each indoor unit;
The sending module is used for sending the target parameters determined by the calculating module to the controller of the corresponding indoor unit;
The communication module is used for communicating with each indoor unit controller;
the storage module is used for storing the area, layout and comfort degree model parameters of each room;
And the display module is used for displaying the temperature and humidity of each room and the running mode information.
Further, the computing module includes:
The load calculation unit is used for calculating the refrigeration load of each room according to the area, layout, external temperature and humidity and the number of people in the room, and sequencing the loads of each room according to the priority level and the load size;
a mode determining unit for determining the working mode of each room according to the load size and the mode set by the user;
the parameter calculation unit is used for calculating the target temperature and the target humidity of each room according to the room load condition, the working mode, the area and the comfort level model;
The refrigerating capacity distribution unit calculates the total refrigerating capacity of the outdoor unit according to the total load of all rooms and distributes the refrigerating capacity of each room according to the priority and the load demand;
And the optimizing processing unit is used for dynamically optimizing and distributing the refrigerating capacity according to the load change and adjusting the frequency of the compressor according to the load demand change.
Further, the sending module includes:
The communication protocol processing unit is used for packaging and encoding the control instruction output by the calculation module and organizing the data packet according to the format of a preset communication protocol;
the network communication unit is used for carrying out data transmission with the communication modules of the indoor units through a wired network or a wireless network;
the data buffer queue is used for buffering the sent and received data packets;
And the fault detection unit is used for detecting the network communication unit and judging whether the network communication unit is normal or not.
Further, the fault detection unit includes:
the connection state detection module is used for setting a random port of a source port of the TCP header, setting a destination port as an indoor unit port, calling a checksum calculation function to calculate a checksum, filling the TCP header, acquiring the current time, judging whether the time interval between the current time and the last transmission is more than or equal to 10 seconds, calling SendTCP functions to transmit TCP detection packets if the time interval is more than or equal to 10 seconds, and ending the flow if the time interval is less than 10 seconds.
The data transmission detection module is used for acquiring a sending message head, extracting protocol and length information, analyzing the message according to the protocol type, counting the number of effective messages, accumulating the number to the sending total number, acquiring a receiving message head, extracting the protocol and length information, filtering invalid messages, analyzing the number of the effective messages, accumulating the number to the receiving total number, acquiring the current time, judging whether the whole second is reached, if so, calculating the packet loss number, updating the annular queue, maintaining the sliding window, if not, ending the flow, calculating the packet loss rate in the sliding window, judging whether the packet loss rate exceeds a threshold value for three continuous periods, if so, recording the data transmission failure, sending an alarm, and if not, ending the flow.
Further, the load calculation unit includes:
The room information acquisition module is used for acquiring room information and the number of heat sources;
The external parameter acquisition module is used for acquiring outdoor temperature, humidity and solar radiation parameters, and acquiring building parameters such as heat conduction coefficients of walls;
The heat transfer calculation module is used for calculating heat transfer loss of the wall body according to room and outdoor parameters, calculating heat brought by heat source heat dissipation in the room, and calculating ventilation and window heat conduction loss;
The comprehensive calculation module calculates a heat contribution comprehensive value according to heat transfer loss of a wall body, heat brought by heat source heat dissipation in a room, ventilation and window heat conduction loss, and determines the total refrigeration load of the room;
And the load distribution module distributes the total refrigeration load of the room to each indoor unit and outputs the refrigeration load value of each indoor unit.
Further, the parameter calculation unit includes:
The temperature parameter calculation module is used for calculating the heat load of the room according to the factors of the area, the layout and the number of people of the room and a preset comfort degree model, calculating a target temperature value of the room according to the heat load and the temperature setting of a user, and determining the refrigerating capacity according to the difference between the target temperature and the outdoor temperature;
the humidity parameter calculation module is used for calculating potential humidity load according to factors of room area, layout and number of people, calculating a target humidity value of the room by combining humidity setting of a user, and determining refrigerating capacity according to the difference between the target humidity and the current humidity;
the refrigerating capacity calculating module is used for comprehensively processing the refrigerating capacity of the temperature parameter calculating module and the humidity parameter calculating module, determining the total refrigerating capacity of the room according to the preset priority and comfort level, and outputting the opening value of the electronic expansion valve and the rotating speed value of the fan according to the total refrigerating capacity of the room.
The scheme of the invention at least comprises the following beneficial effects:
According to the scheme, the central controller can dynamically calculate and distribute the refrigerating capacity according to the load condition of each room, load optimization is achieved, the frequency of the compressor can be adjusted in real time according to load change, energy efficiency is improved, indoor environment parameters are monitored in a centralized mode, comfort level is maintained, centralized control of the indoor units can be achieved, and user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a control system of a double-compressed water cooling cabinet type multi-split air conditioner provided by an embodiment of the invention.
Fig. 2 is a schematic diagram of a main control chip of a double-compressed water cooling cabinet type multi-split air conditioner control system provided by an embodiment of the invention.
Fig. 3 is a schematic diagram of a central controller of a control system of a double-compressed water-cooling type multi-split air conditioner according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described more closely below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a control system for a double-compression refrigerator type multi-split air conditioner, including:
the indoor units are arranged indoors;
the indoor unit controller is arranged in the corresponding indoor unit and used for controlling the opening and the adjustment of the corresponding indoor unit;
The central controller is respectively connected with the indoor unit controllers, monitors the operation parameters of the indoor units and the corresponding room temperature in real time, calculates the operation mode and the refrigerating capacity of each indoor unit according to the load condition, and controls the indoor unit controllers to operate according to the calculation results.
According to the embodiment of the invention, the number of the indoor units can be reasonably configured according to the size and the layout of a room to meet the refrigeration requirement, the indoor unit controller can accurately control the operation of the corresponding indoor units, quickly respond to instructions, and the built-in sensor feedback parameters are beneficial to the central controller to calculate the control strategy, the central controller monitors the indoor environment parameters in real time, scientifically calculates the refrigeration capacity, improves the comfort level, uniformly coordinates each indoor unit, optimizes the system operation, improves the energy efficiency, realizes the centralized control and management of the indoor units, facilitates the operation of users, can exchange the refrigeration capacity among the indoor units, optimizes the load distribution, and can coordinate each indoor unit in an integrated manner to realize the optimal control.
In a preferred embodiment of the invention, each outdoor unit is internally provided with a compressor, an electronic expansion valve and a four-way reversing valve, the indoor unit controller comprises a main control chip, a driving module and a sensor module, the main control chip receives a control instruction of the central controller and transmits the control instruction to the driving module, the driving module is connected with the electronic expansion valve, the fan and the indoor heat exchanger and used for controlling the opening and the adjustment of the electronic expansion valve, the fan and the indoor heat exchanger, and the sensor module is used for detecting indoor environment parameters in real time and feeding back the indoor environment parameters to the main control chip.
In the embodiment of the invention, the compressor can adjust the refrigerating capacity according to load change, improve energy efficiency, the electronic expansion valve accurately controls the flow of the refrigerant and optimizes heat exchange effect, the four-way reversing valve can switch cold and hot circulation according to requirements, the application range is enlarged, the main control chip of the indoor unit controller can receive instructions of the central controller, the indoor unit is accurately controlled to operate, the driving control of the electronic expansion valve, the fan and the like is realized, the driving module can accurately drive the electronic expansion valve, the fan and the like according to instructions of the main control chip to control the refrigerating effect, the sensor module monitors parameters such as temperature and humidity in real time and feeds back to the main control chip to realize accurate control, the electronic expansion valve can linearly adjust opening degree to accurately control the refrigerating capacity, the fan can adjust air quantity and indoor comfort level is controlled. Therefore, the design of the indoor unit controller realizes the accurate control of the indoor unit, and improves the intelligent level and the comfort of the system.
As shown in fig. 2, the main control chip includes:
The target temperature determining module receives a target temperature value instructed by the central controller;
The target humidity determining module receives a target humidity value instructed by the central controller;
The temperature PID control module calculates the opening value of the electronic expansion valve according to the target temperature and the current temperature fed back by the sensor module, and sends the opening value of the electronic expansion valve to the driving module;
and the humidity PID control module is used for calculating a fan rotating speed value according to the target humidity and the current humidity fed back by the sensor module and sending the fan rotating speed value to the driving module, and the driving module is used for respectively driving the electronic expansion valve and the fan to operate according to the received opening value and the rotating speed value.
In the embodiment of the invention, when the method is applied specifically, the method specifically comprises the steps of determining a target temperature T target by acquiring a central controller temperature instruction T central_command, wherein T target＝Tcentral_command, acquiring a central controller humidity instruction RH central_command, determining a target humidity RH target, wherein RH target＝RHcentral_command, calculating an error e t (T) between the current temperature T current and the target temperature T target, wherein e t(t)＝Ttarget-Tcurrent, calculating a temperature control quantity u t (T), converting the temperature control quantity u t into an opening percentage Valve Opening of an electronic expansion Valve, wherein,T represents time, τ represents the integral variable,Calculating error e h (t) between current humidity RH current and target humidity RH target, wherein e h(t)＝RHtarget-RHcurrent, calculating humidity control quantity u h (t), converting into Fan speed percentage Fan Speed, outputting electronic expansion valve opening and Fan speed control quantity, Therefore, the target temperature determining module receives the temperature setting of the central controller, so that the indoor unit can quickly respond to the target temperature; the temperature PID control module calculates the accurate opening of the electronic expansion valve according to the error between the target temperature and the current temperature.
In a preferred embodiment of the present invention, the driving module includes:
The digital-analog converter is used for converting the received opening value and the rotating speed value into corresponding voltage or current signals;
And the driving circuit amplifies the voltage or current signal output by the digital-analog converter and drives the electronic expansion valve and the blower according to the voltage or current signal.
In the embodiment of the invention, the driving module specifically comprises receiving the percentage of Valve Opening and Fan Speed output by a main control chip, converting the percentage into standard analog voltage and current signals, for example, assuming that the opening value of a received electronic expansion Valve is Valve Opening, the rotating speed value of a Fan is Fan Speed, ：ValveVoltage＝(K1×ValveOpening+B1)×5//K1,FanCurrent＝(K2×FanSpeed+B2)×20//K2,, valve Voltage is a control voltage signal of the electronic expansion Valve, fan Current is a control current signal of the Fan, K 1 is a proportional coefficient from the opening of the electronic expansion Valve to the voltage in digital analog conversion, B 1 is an offset from the opening of the electronic expansion Valve to the voltage in digital analog conversion, K 2 is the rotating speed of the Fan in digital analog conversion, amplifying the converted analog signal through ValveControlVoltage＝A1×ValveVoltage//A1,FanControlCurrent＝A2×FanCurrent//A2, wherein A 1 is the amplifying multiple of the control voltage of the electronic expansion Valve in the driving circuit, valve Valve ControlVoltage is the final control voltage, fan ControlCurrent is the final control current of the Fan after amplifying, judging whether the amplified signal is in a range, and if the amplified signal is in the range, the rotating speed of the Fan is not in the current range, and if the rotating speed of the electronic expansion Valve is not in the current range, and the rotating speed is not in the current range.
The embodiment of the invention converts the received opening value and the rotating speed value into standard analog voltage and current signals, is convenient for the amplification and the processing of a driving circuit, can adjust the conversion relation through the proportional coefficient and the offset, is suitable for different control requirements, amplifies the analog signals output by the digital-analog converter to drive the electronic expansion valve and the fan, can adjust the amplification factor, drives different loads, has good quality, is stable and reliable, can accurately adjust the opening of the valve through the driving signal, and is continuously variable, accurate in control, continuously adjusts the speed through the driving signal, and is accurate in control. In conclusion, the driving module realizes accurate conversion and driving of the digital signal of the main control chip to the actuator, and improves the control precision and stability of the system.
As shown in fig. 3, the central controller includes:
the receiving module is used for receiving the room temperature and humidity parameters fed back by the indoor unit controllers;
The calculation module is used for calculating the load condition and the operation mode of each room according to the room temperature and the humidity parameters fed back by the receiving module and combining with a preset comfort degree model, and determining the target temperature, the target humidity and the refrigerating capacity of each indoor unit;
The sending module is used for sending the target parameters determined by the calculating module to the controller of the corresponding indoor unit;
The communication module is used for communicating with each indoor unit controller;
the storage module is used for storing the area, layout and comfort degree model parameters of each room;
And the display module is used for displaying the temperature and humidity of each room and the running mode information.
In the embodiment of the invention, the temperature and humidity parameters fed back by the indoor unit are received in real time, a control basis is provided for the calculation module, a control strategy is intelligently calculated according to the temperature and humidity parameters, optimal control is realized, reasonable parameters are determined by combining a comfort degree model, the calculated result is sent to the indoor unit controller in real time, quick response is realized, the communication module ensures real-time and reliable communication between the central controller and the indoor unit, the storage module stores related parameters, data support is provided for the calculation module, and the display module displays the running state of the system in real time, so that the monitoring is convenient. In conclusion, the central controller realizes the optimized coordination control of the whole system through data collection, intelligent calculation, real-time communication and monitoring display, and the intelligent level, the energy-saving effect and the user experience of the air conditioning system are greatly improved.
In a preferred embodiment of the present invention, the calculation module includes:
The load calculation unit is used for calculating the refrigeration load of each room according to the area, layout, external temperature and humidity and the number of people in the room, and sequencing the loads of each room according to the priority level and the load size;
a mode determining unit for determining the working mode of each room according to the load size and the mode set by the user;
the parameter calculation unit is used for calculating the target temperature and the target humidity of each room according to the room load condition, the working mode, the area and the comfort level model;
The refrigerating capacity distribution unit calculates the total refrigerating capacity of the outdoor unit according to the total load of all rooms and distributes the refrigerating capacity of each room according to the priority and the load demand;
And the optimizing processing unit is used for dynamically optimizing and distributing the refrigerating capacity according to the load change and adjusting the frequency of the compressor according to the load demand change.
In the embodiment of the invention, the load calculation is performed by F i＝a1Ai+a2Pi+a3(Tout,RHout.+ -.), wherein F i is the refrigeration load of the ith room, a i is the room area, P i is the number of people in the room, T out is an outside temperature parameter, RH out is an outside humidity and other parameters, a 1,a2,a3 is a coefficient, the operation mode is determined according to { mode=refrigeration mode, F i>c1 mode=air supply mode, F i<c2, wherein c 1 and c 2 are thresholds, according to T di＝f1(Fi,Ai, comfort model), RH di＝f2(Fi,Ai, comfort model), wherein T di is the target temperature of the ith room, RH di is the target humidity of the ith room, F 1 and F 2 are empirical functions, and the operation mode is determined according to { mode=refrigeration mode, F5332 is a threshold, according to comfort model), the parameter calculation is performedThe method comprises the steps of performing refrigeration capacity distribution, wherein F T is total refrigeration load, F ' i is refrigeration capacity distributed to an ith room, performing optimization according to minJ(f,F′i)J＝w1J1+w2J2+w3×J3J1＝∑i|F′i-Fi|J2＝∑(|Tdi-T Target object |+|RHdi-RH Target object |)J3＝f2, wherein w 1、w2、w3 is a weight coefficient, J 1 is a load balance item, representing errors of distributed refrigeration capacity F ' i and room refrigeration load F i, J 2 is a comfort item, td i is a target value of temperature comfort, T Target object is a target value of temperature comfort, d i is a target value of the ith room, RH Target object is a target value of humidity comfort, and RHhumidity is a target value of humidity 3, according to e (T) =load target-load current u (T) =k pe(t)+ki∫e(t)dt+kd ×de (T)/dtf =limiting (u (T), and F min,fmax), wherein e (T) =load target-load current u (T) -PID control amount F-compressor frequency, k p、ki、kd is PID control parameter, F min is a minimum value of compressor frequency, F max is a maximum value of compressor frequency, e (T) is a temperature error or humidity error, and W 1、w2、w3 is a weight coefficient, J 1 is a load balance item, and J i is a target value of the refrigeration capacity F ' i and F i.
In the embodiment of the invention, the dynamic refrigeration load of the room is calculated according to various influencing factors, basic data is provided for the system, the working mode required by the room is intelligently judged according to the load condition, the comfort level is improved, the target temperature and humidity parameters of the room are calculated, the refrigeration resource is reasonably distributed, the system load is optimized, the efficiency is improved, the frequency of the compressor is adjusted in real time, the refrigeration capacity distribution is dynamically optimized, and the optimal operation of the system is realized.
In a preferred embodiment of the present invention, the transmitting module includes:
The communication protocol processing unit is used for packaging and encoding the control instruction output by the calculation module and organizing the data packet according to the format of a preset communication protocol;
the network communication unit is used for carrying out data transmission with the communication modules of the indoor units through a wired network or a wireless network;
the data buffer queue is used for buffering the sent and received data packets;
And the fault detection unit is used for detecting the network communication unit and judging whether the network communication unit is normal or not.
In the embodiment of the invention, the control instructions are packaged and encoded and organized into standard data packets, the transmission reliability is ensured, the wired and wireless networks are supported, the method is flexible and convenient, the expansibility is strong, the data packets are buffered, the transmission blocking is prevented, the communication efficiency is improved, the network communication quality is monitored in real time, faults are found and positioned in time, and in conclusion, the transmission module ensures the efficient and stable communication between the central controller and the indoor units through packaging processing, network selection, buffer transmission and fault detection, and realizes the reliable transmission of the control instructions and the effective return of data.
In a preferred embodiment of the present invention, the fault detection unit includes:
the connection state detection module is used for setting a random port of a source port of the TCP header, setting a destination port as an indoor unit port, calling a checksum calculation function to calculate a checksum, filling the TCP header, acquiring the current time, judging whether the time interval between the current time and the last transmission is more than or equal to 10 seconds, calling SendTCP functions to transmit TCP detection packets if the time interval is more than or equal to 10 seconds, and ending the flow if the time interval is less than 10 seconds.
The data transmission detection module is used for acquiring a sending message head, extracting protocol and length information, analyzing the message according to the protocol type, counting the number of effective messages, accumulating the number to the sending total number, acquiring a receiving message head, extracting the protocol and length information, filtering invalid messages, analyzing the number of the effective messages, accumulating the number to the receiving total number, acquiring the current time, judging whether the whole second is reached, if so, calculating the packet loss number, updating the annular queue, maintaining the sliding window, if not, ending the flow, calculating the packet loss rate in the sliding window, judging whether the packet loss rate exceeds a threshold value for three continuous periods, if so, recording the data transmission failure, sending an alarm, and if not, ending the flow.
In the embodiment of the invention, the connection fault can be quickly found by constructing the TCP detection packet to detect the network connection state, the number of the sent and received messages is counted, the packet loss rate is calculated, the data transmission quality can be monitored in real time, the packet loss condition can be continuously monitored by using a sliding window technology, the connection fault and the data transmission fault can be timely found by fault detection and alarm, the alarm is carried out, the problem location and the processing are facilitated, the continuous deterioration of the communication quality is avoided, the ring queue can effectively store historical statistical data, the storage space is saved, and in conclusion, the fault detection unit ensures the network communication quality by the connection detection and the data transmission detection, timely finds and locates the fault, and provides a guarantee for the stable operation of the system.
In a preferred embodiment of the present invention, the load calculation unit includes:
The room information acquisition module is used for acquiring room information and the number of heat sources;
The external parameter acquisition module is used for acquiring outdoor temperature, humidity and solar radiation parameters, and acquiring building parameters such as heat conduction coefficients of walls;
The heat transfer calculation module is used for calculating heat transfer loss of the wall body according to room and outdoor parameters, calculating heat brought by heat source heat dissipation in the room, and calculating ventilation and window heat conduction loss;
The comprehensive calculation module calculates a heat contribution comprehensive value according to heat transfer loss of a wall body, heat brought by heat source heat dissipation in a room, ventilation and window heat conduction loss, and determines the total refrigeration load of the room;
And the load distribution module distributes the total refrigeration load of the room to each indoor unit and outputs the refrigeration load value of each indoor unit.
In the embodiment of the invention, the area A i of the ith room and the number N i of people in the ith room are obtained, the outdoor temperature T out, the outdoor relative humidity RH out, the solar radiation intensity I and the wall heat conductivity coefficient k are obtained, the sum of heat transfer losses of all rooms is obtained according to a calculation formula of Q total＝∑i(q1i+q2i+q3i) +safety coefficient, wherein Q 1i＝kAi(Tin-Tout)/ith room wall heat transfer, Q 2i＝NiQp// ith room heat release by human body, Q 3i＝QvAi// ith room ventilation heat loss, Q v heat loss generated by ventilation, Q p heat release by human body, T in is room temperature, Q total is room total refrigeration load and the temperature is calculated according to the formula of Q total＝∑i(q1i+q2i+q3i) +safety coefficientThe total refrigeration load is distributed according to the room area ratio, W i is the weight coefficient of the ith room, and Q i represents the refrigeration load amount distributed to the ith room.
In the embodiment of the invention, the room information acquisition module acquires information such as room area, layout and the like, the external parameter acquisition module acquires outdoor environment parameters, the heat transfer loss influence factors are calculated, the heat transfer calculation module calculates various heat transfer losses, the refrigeration load is accurately predicted, and the comprehensive calculation module synthesizes the calculation results of all parts to accurately obtain the total refrigeration load.
In a preferred embodiment of the present invention, the parameter calculation unit includes:
The temperature parameter calculation module is used for calculating the heat load of the room according to the factors of the area, the layout and the number of people of the room and a preset comfort degree model, calculating a target temperature value of the room according to the heat load and the temperature setting of a user, and determining the refrigerating capacity according to the difference between the target temperature and the outdoor temperature;
the humidity parameter calculation module is used for calculating potential humidity load according to factors of room area, layout and number of people, calculating a target humidity value of the room by combining humidity setting of a user, and determining refrigerating capacity according to the difference between the target humidity and the current humidity;
the refrigerating capacity calculating module is used for comprehensively processing the refrigerating capacity of the temperature parameter calculating module and the humidity parameter calculating module, determining the total refrigerating capacity of the room according to the preset priority and comfort level, and outputting the opening value of the electronic expansion valve and the rotating speed value of the fan according to the total refrigerating capacity of the room.
In an embodiment of the invention, a room temperature heat load Q t is calculated, wherein Q t＝k1A+k2N+k3I+k4(Tin-Tout) a target temperature T target is calculated according to T target＝Tset-Kp(Tset-Tcurrent), a temperature cooling capacity QC t is calculated according to QC t＝c1(Ttarget-Tout), a room humidity heat load Q h is calculated according to Q h＝k5A+k6 N, a target humidity RH target is calculated according to RH target＝RHset-Kp(RHset-RHcurrent), a humidity cooling capacity QC h is calculated according to QC h＝c2(RHtarget-RHcurrent), a total cooling capacity QC total is calculated according to QC total＝w1QCt+w2QCh, a Valve opening value and a Fan rotation speed Fan are mapped according to valve=map (QC total),Fan＝map(QCtotal), wherein K 1,k2,k3,k4,k5 and K 6 are empirical coefficients related when calculating the temperature heat load Q t, T set is a temperature set value set by a user, K p is a proportionality coefficient in PID control, T current is a current indoor temperature, c 1 is an empirical coefficient when calculating the temperature cooling capacity, RH set is a humidity set value set by a user, N is a number of people in a room, a is a room area, I is solar radiation intensity, and c 2 is an empirical coefficient when calculating the humidity capacity.
According to the embodiment of the invention, the temperature parameter calculation module calculates the target temperature according to the room characteristics and the comfort level model to realize accurate control of the temperature, the humidity parameter calculation module calculates the target humidity according to the room characteristics to realize accurate control of the humidity, the refrigerating capacity calculation module comprehensively considers the temperature and humidity control, distributes refrigerating resources according to priority, improves the comfort, the opening control of the electronic expansion valve accurately adjusts the flow of the refrigerant to improve the refrigerating effect, and the variable-frequency control of the fan adjusts the air quantity according to the refrigerating capacity change to achieve better control effect. In conclusion, the parameter calculation unit coordinates temperature and humidity control and optimizes refrigeration resource allocation through scientifically calculating control parameters, so that the air conditioner operates more intelligently and accurately, and comfortableness and energy conservation are greatly improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (1)
1. A double-compression water-cooling cabinet type multi-split air conditioner control system is characterized by comprising:
the indoor units are arranged indoors;
the indoor unit controller is arranged in the corresponding indoor unit and used for controlling the opening and the adjustment of the corresponding indoor unit;
The system comprises a plurality of indoor machine controllers, a central controller, a sensor module, an electronic expansion valve, a control module and a control module, wherein the indoor machine controllers are respectively connected with the plurality of indoor machine controllers, the operation parameters of the plurality of indoor machines and the corresponding room temperature are monitored in real time, the operation mode and the refrigerating capacity of each indoor machine are calculated according to the load condition, the indoor machine controllers are controlled to operate according to the calculation result, each outdoor machine is internally provided with the compressor, the electronic expansion valve and the four-way reversing valve, the main control chip receives the control instruction of the central controller and transmits the control instruction to the driving module, the driving module is connected with the electronic expansion valve, the fan and the indoor heat exchanger and is used for controlling the opening and the adjustment of the electronic expansion valve, the fan and the indoor heat exchanger, and the sensor module is used for detecting the indoor environment parameters in real time and feeding back to the main control chip;
The main control chip comprises:
The target temperature determining module receives a target temperature value instructed by the central controller;
The target humidity determining module receives a target humidity value instructed by the central controller;
The temperature PID control module calculates the opening value of the electronic expansion valve according to the target temperature and the current temperature fed back by the sensor module, and sends the opening value of the electronic expansion valve to the driving module;
The humidity PID control module calculates the fan rotating speed value according to the target humidity and the current humidity fed back by the sensor module, and sends the fan rotating speed value to the driving module, the driving module respectively drives the electronic expansion Valve and the fan to operate according to the received opening value and the rotating speed value, when the electronic expansion Valve is particularly applied, the electronic expansion Valve comprises the steps of determining the target temperature T target by acquiring a central controller temperature instruction T central_command, wherein T target=Tcentral_command, acquiring the central controller humidity instruction RH central_command, determining the target humidity RH target, wherein RH target=RHcentral_command, calculating an error e t (T) between the current temperature T current and the target temperature T target, wherein e t(t)=Ttarget−Tcurrent, calculating a temperature control quantity u t (T), and converting the temperature control quantity into an opening percentage Valve Opening of the electronic expansion Valve, T represents the time period, and the time period,The integral variable is represented by a value of the integral variable,Calculating error e h (t) between current humidity RH current and target humidity RH target, wherein e h(t)=RHtarget−RHcurrent, calculating humidity control quantity u h (t), converting into Fan speed percentage Fan Speed, outputting electronic expansion valve opening and Fan speed control quantity,The system comprises a central controller, a target temperature determining module, a target humidity determining module, a temperature PID control module, an electronic expansion valve, a temperature control module and a control module, wherein the central controller is used for controlling the indoor unit to quickly respond to the target temperature;
the driving module includes:
The digital-analog converter is used for converting the received opening value and the rotating speed value into corresponding voltage or current signals;
The driving circuit amplifies the voltage or current signal output by the digital-analog converter and drives the electronic expansion valve and the fan according to the voltage or current signal;
The central controller includes:
the receiving module is used for receiving the room temperature and humidity parameters fed back by the indoor unit controllers;
The calculation module is used for calculating the load condition and the operation mode of each room according to the room temperature and the humidity parameters fed back by the receiving module and combining with a preset comfort degree model, and determining the target temperature, the target humidity and the refrigerating capacity of each indoor unit;
The sending module is used for sending the target parameters determined by the calculating module to the controller of the corresponding indoor unit;
The communication module is used for communicating with each indoor unit controller;
the storage module is used for storing the area, layout and comfort degree model parameters of each room;
the display module is used for displaying the temperature and humidity of each room and the running mode information;
The computing module includes:
The load calculation unit is used for calculating the refrigeration load of each room according to the area, layout, external temperature and humidity and the number of people in the room, and sequencing the loads of each room according to the priority level and the load size;
a mode determining unit for determining the working mode of each room according to the load size and the mode set by the user;
the parameter calculation unit is used for calculating the target temperature and the target humidity of each room according to the room load condition, the working mode, the area and the comfort level model;
The refrigerating capacity distribution unit calculates the total refrigerating capacity of the outdoor unit according to the total load of all rooms and distributes the refrigerating capacity of each room according to the priority and the load demand;
The optimizing processing unit is used for dynamically optimizing and distributing the refrigerating capacity according to the load change and adjusting the frequency of the compressor according to the load demand change;
The transmitting module includes:
The communication protocol processing unit is used for packaging and encoding the control instruction output by the calculation module and organizing the data packet according to the format of a preset communication protocol;
the network communication unit is used for carrying out data transmission with the communication modules of the indoor units through a wired network or a wireless network;
the data buffer queue is used for buffering the sent and received data packets;
the fault detection unit is used for detecting the network communication unit and judging whether the network communication unit is normal or not;
The fault detection unit includes:
The connection state detection module is used for setting a random port of a source port of the TCP header and a target port of the TCP header, calling a checksum calculation function to calculate a checksum, filling the TCP header, acquiring the current time, judging whether the time interval between the current time and the last transmission is more than or equal to 10 seconds, calling SendTCP functions to transmit TCP detection packets if the time interval is more than or equal to 10 seconds, and ending the flow if the time interval is less than 10 seconds;
The data transmission detection module is used for acquiring a sending message head, extracting protocol and length information, analyzing the message according to the protocol type, counting the number of effective messages, accumulating the number to the sending total number, acquiring a receiving message head, extracting the protocol and length information, filtering invalid messages, analyzing the number of the effective messages, accumulating the number to the receiving total number, acquiring the current time, judging whether the whole second is reached, if so, calculating the packet loss number, updating the annular queue, maintaining a sliding window, if not, ending the flow, calculating the packet loss rate in the sliding window, judging whether the packet loss rate exceeds a threshold value for three continuous periods, if so, recording the data transmission failure, sending an alarm, and if not, ending the flow;
The load calculation unit includes:
The room information acquisition module is used for acquiring room information and the number of heat sources;
The external parameter acquisition module is used for acquiring outdoor temperature, humidity and solar radiation parameters and acquiring the heat conduction coefficient of the wall body;
The heat transfer calculation module is used for calculating heat transfer loss of the wall body according to room and outdoor parameters, calculating heat brought by heat source heat dissipation in the room, and calculating ventilation and window heat conduction loss;
The comprehensive calculation module calculates a heat contribution comprehensive value according to heat transfer loss of a wall body, heat brought by heat source heat dissipation in a room, ventilation and window heat conduction loss, and determines the total refrigeration load of the room;
The load distribution module distributes the total refrigeration load of the room to each indoor unit and outputs the refrigeration load value of each indoor unit;
the parameter calculation unit includes:
The temperature parameter calculation module is used for calculating the heat load of the room according to the factors of the area, the layout and the number of people of the room and a preset comfort degree model, calculating a target temperature value of the room according to the heat load and the temperature setting of a user, and determining the refrigerating capacity according to the difference between the target temperature and the outdoor temperature;
the humidity parameter calculation module is used for calculating potential humidity load according to factors of room area, layout and number of people, calculating a target humidity value of the room by combining humidity setting of a user, and determining refrigerating capacity according to the difference between the target humidity and the current humidity;
the refrigerating capacity calculating module is used for comprehensively processing the refrigerating capacity of the temperature parameter calculating module and the humidity parameter calculating module, determining the total refrigerating capacity of the room according to the preset priority and comfort level, and outputting the opening value of the electronic expansion valve and the rotating speed value of the fan according to the total refrigerating capacity of the room.
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