A dual compression water-cooled cabinet type multi-split air conditioning control system

Abstract

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

[0001] The invention relates to the technical field of air-conditioning control systems, and in particular to a double-compression water-cooled cabinet-type multi-connected air-conditioning control system. Background Art

[0002] Traditional air conditioning systems mostly use a single indoor unit layout, that is, one outdoor unit is connected to one indoor unit, which results in the need to lay a large number of condensing pipes when large-area air conditioning is required, increasing the difficulty of installation and reducing air conditioning efficiency. In order to solve these problems, a multi-split air conditioning system has emerged, which connects multiple indoor units through one outdoor unit, thereby realizing centralized supply and decentralized use of air conditioning, reducing installation difficulty and improving air conditioning efficiency.

[0003] However, some current multi-split air conditioning systems have the following problems:

[0004] 1. The system control is decentralized, unable to coordinate and dispatch, and reduces energy efficiency;

[0005] 2. The cooling capacity cannot be exchanged between indoor units, making it difficult to achieve load balance;

[0006] 3. Lack of centralized monitoring and management of indoor environment. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a dual-compression water-cooled cabinet multi-split air-conditioning control system, which 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.

[0008] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0009] A dual-compression water-cooled cabinet-type multi-split air-conditioning control system, comprising:

[0010] Multiple indoor units are installed indoors;

[0011] An indoor unit controller, arranged in the corresponding indoor unit, for controlling the opening and adjustment of the corresponding indoor unit;

[0012] The central controller is connected to the plurality of indoor unit controllers, monitors the operating parameters of the plurality of indoor units and the corresponding room temperatures 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.

[0013] Furthermore, each of the outdoor units is provided with a compressor, an electronic expansion valve and a four-way reversing valve; the indoor unit controller includes a main control chip, a drive module and a sensor module, the main control chip receives control instructions from the central controller and transmits them to the drive module, the drive module is connected to the electronic expansion valve, the fan and the indoor heat exchanger, and is used to control the opening and adjustment of the electronic expansion valve, the fan and the indoor heat exchanger; the sensor module is used to detect indoor environmental parameters in real time and feed them back to the main control chip.

[0014] Furthermore, the main control chip includes:

[0015] A target temperature determination module receives a target temperature value commanded by a central controller;

[0016] A target humidity determination module receives a target humidity value commanded by a central controller;

[0017] 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;

[0018] The humidity PID control module calculates the fan speed value according to the target humidity and the current humidity fed back by the sensor module, and sends the fan speed value to the drive module. The drive module drives the electronic expansion valve and the fan to operate according to the received opening value and speed value.

[0019] Furthermore, the driving module includes:

[0020] A digital-to-analog converter converts the received opening value and speed value into a corresponding voltage or current signal;

[0021] The driving circuit amplifies the voltage or current signal output by the digital-to-analog converter and drives the electronic expansion valve and the fan according to the voltage or current signal.

[0022] Furthermore, the central controller includes:

[0023] A receiving module, used for receiving room temperature and humidity parameters fed back by each indoor unit controller;

[0024] The calculation module calculates the load and operation mode of each room based on the room temperature and humidity parameters fed back by the receiving module and the preset comfort model, and determines the target temperature, target humidity and cooling capacity of each indoor unit;

[0025] A sending module, which sends the target parameters determined by the calculation module to the controller of the corresponding indoor unit;

[0026] A communication module, used for communicating with each indoor unit controller;

[0027] A storage module is used to store the area, layout, and comfort model parameters of each room;

[0028] The display module is used to display the temperature, humidity and operation mode information of each room.

[0029] Furthermore, the calculation module includes:

[0030] The load calculation unit is used to calculate the cooling load of each room according to the area, layout, external temperature and humidity, and number of people in each room, and sort the load of each room according to the priority level and load size;

[0031] A mode determination unit, used to determine the working mode of each room according to the load size and the mode set by the user;

[0032] A parameter calculation unit is used to calculate the target temperature and target humidity of each room according to the room load, working mode, area and comfort model;

[0033] The cooling capacity allocation unit calculates the total cooling capacity of the outdoor unit based on the total load of all rooms, and allocates the cooling capacity to each room according to priority and load demand;

[0034] The optimization processing unit dynamically optimizes the allocation of cooling capacity according to load changes and adjusts the compressor frequency according to changes in load demand.

[0035] Furthermore, the sending module includes:

[0036] The communication protocol processing unit encapsulates and encodes the control instructions output by the computing module and organizes the data packets according to the format of the predetermined communication protocol;

[0037] A network communication unit transmits data with the communication modules of each indoor unit via a wired network or a wireless network;

[0038] Data cache queue, used to cache sent and received data packets;

[0039] The fault detection unit is used to detect the network communication unit to determine whether the network communication unit is normal.

[0040] Furthermore, the fault detection unit includes:

[0041] The connection status detection module is used to set the TCP header source port to a random port and the destination port to the indoor unit port; call the checksum calculation function to calculate the checksum and fill the TCP header; obtain the current time and determine whether the time interval with the last sending is ≥10 seconds; if the interval is ≥10 seconds, call the SendTCP function to send a TCP detection packet; if the interval is <10 seconds, end the process.

[0042] The data transmission detection module is used to obtain the sending message header, extract the protocol and length information; parse the message according to the protocol type, count the number of valid messages, and add them to the total number of sent messages; obtain the receiving message header, extract the protocol and length information; filter invalid messages, parse the valid messages, and add the statistical number to the total number of received messages; obtain the current time and determine whether it is an integer second; if so, calculate the number of packet losses, update the circular queue, and maintain the sliding window; if not, end the process; calculate the packet loss rate in the sliding window; determine whether the packet loss rate exceeds the threshold for three consecutive cycles; if so, record it as a data transmission failure and send an alarm; if not, end the process.

[0043] Furthermore, the load calculation unit includes:

[0044] Room information acquisition module, used to obtain room information and the number of heat sources;

[0045] The external parameter acquisition module is used to obtain outdoor temperature, humidity and solar radiation parameters, as well as building parameters such as the thermal conductivity coefficient of the wall;

[0046] The heat transfer calculation module is used to calculate the heat transfer loss of the wall according to the room and outdoor parameters, calculate the heat dissipated by the heat source in the room, and calculate the ventilation and window heat conduction loss;

[0047] The comprehensive calculation module calculates the comprehensive value of heat contribution based on the heat transfer loss of the wall, the heat dissipated by the heat source in the room, and the heat conduction loss of ventilation and windows, and determines the total cooling load of the room;

[0048] The load distribution module distributes the total cooling load of the room to each indoor unit and outputs the cooling load value of each indoor unit.

[0049] Furthermore, the parameter calculation unit includes:

[0050] The temperature parameter calculation module is used to calculate the heat load of the room according to the room area, layout, number of people, and the preset comfort model, calculate the target temperature value of the room according to the heat load size and the user's temperature setting, and determine the cooling capacity according to the difference between the target temperature and the outdoor temperature;

[0051] The humidity parameter calculation module is used to calculate the potential humidity load based on the room area, layout, and number of people. Combined with the user's humidity setting, it calculates the target humidity value of the room and determines the cooling capacity based on the difference between the target humidity and the current humidity.

[0052] The cooling capacity calculation module is used to comprehensively process the cooling capacity of the temperature parameter calculation module and the humidity parameter calculation module, determine the total cooling capacity of the room according to the preset priority and comfort level, and output the opening value of the electronic expansion valve and the speed value of the fan according to the total cooling capacity of the room.

[0053] The above solution of the present invention includes at least the following beneficial effects:

[0054] According to the above scheme of the present invention, the central controller can dynamically calculate and allocate the cooling capacity according to the load conditions of each room to achieve load optimization, can adjust the compressor frequency in real time according to load changes to improve energy efficiency, centrally monitor indoor environmental parameters to maintain comfort, and can realize centralized control of the indoor unit to improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of a dual-compression water-cooled cabinet-type multi-split air-conditioning control system provided by an embodiment of the present invention.

[0056] Figure 2 It is a schematic diagram of the main control chip of the dual-compression water-cooled cabinet multi-split air-conditioning control system provided by an embodiment of the present invention.

[0057] Figure 3 It is a schematic diagram of a central controller of a dual-compression water-cooled cabinet-type multi-split air-conditioning control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0059] like Figure 1 As shown, an embodiment of the present invention provides a dual-compression water-cooled cabinet multi-split air conditioning control system, comprising:

[0060] Multiple indoor units are installed indoors;

[0061] An indoor unit controller, arranged in the corresponding indoor unit, for controlling the opening and adjustment of the corresponding indoor unit;

[0062] The central controller is connected to the plurality of indoor unit controllers, respectively, monitors the operating parameters of the plurality of indoor units and the corresponding room temperatures 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.

[0063] In the embodiment of the present invention, by setting up multiple indoor units, the number of indoor units can be reasonably configured according to the size and layout of the room to meet the cooling demand; the indoor unit controller can accurately control the operation of the corresponding indoor unit, quickly respond to instructions, and the built-in sensor feedback parameters are conducive to the central controller to calculate the control strategy; the central controller monitors the indoor environmental parameters in real time, scientifically calculates the cooling capacity, improves the comfort level, uniformly coordinates each indoor unit, optimizes the system operation, improves energy efficiency, realizes centralized control and management of the indoor units, and facilitates user operation. The cooling capacity can be exchanged between the indoor units to optimize the load distribution. The central controller can coordinate each indoor unit to achieve optimized control.

[0064] In a preferred embodiment of the present invention, each of the outdoor units is provided with a compressor, an electronic expansion valve and a four-way reversing valve; the indoor unit controller includes a main control chip, a drive module and a sensor module, the main control chip receives control instructions from the central controller and transmits them to the drive module, the drive module is connected to the electronic expansion valve, the fan and the indoor heat exchanger, and is used to control the opening and adjustment of the electronic expansion valve, the fan and the indoor heat exchanger; the sensor module is used to detect indoor environmental parameters in real time and feed them back to the main control chip.

[0065] In the embodiment of the present invention, the compressor can adjust the cooling capacity according to the load change to improve energy efficiency, the electronic expansion valve can accurately control the refrigerant flow rate to optimize the heat exchange effect, the four-way reversing valve can switch the cold and hot cycles according to the demand, and expand the application scope. The main control chip of the indoor unit controller can receive the instructions of the central controller, accurately control the operation of the indoor unit, and realize the drive control of the electronic expansion valve, fan, etc.; the drive module can accurately drive the electronic expansion valve, fan, etc. according to the instructions of the main control chip to control the cooling effect; the sensor module monitors the temperature and humidity and other parameters in real time, and feeds back to the main control chip to realize accurate control; the electronic expansion valve can linearly adjust the opening to accurately control the cooling capacity; the fan can adjust the air volume to control the indoor comfort. Therefore, the design of the indoor unit controller realizes the accurate control of the indoor unit and improves the intelligence level and comfort of the system.

[0066] like Figure 2 As shown, the main control chip includes:

[0067] A target temperature determination module receives a target temperature value commanded by a central controller;

[0068] A target humidity determination module receives a target humidity value commanded by a central controller;

[0069] 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;

[0070] The humidity PID control module calculates the fan speed value according to the target humidity and the current humidity fed back by the sensor module, and sends the fan speed value to the drive module. The drive module drives the electronic expansion valve and the fan to operate according to the received opening value and speed value.

[0071] In the embodiment of the present invention, when it is applied specifically, it specifically includes: obtaining the temperature instruction T of the central controller central_command , determine the target temperature T target , where T target =T central_command ; Get the humidity command RH of the central controller central_command , determine the target humidity RH target , where RH target =RH central_command ; Calculate the current temperature T current With the target temperature T target The error e t (t), where e t (t) = T target -T current ; Calculate the temperature control quantity u t (t), converted to the opening percentage of the electronic expansion valve Valve Opening ,in, t represents time, τ represents the integral variable, Calculate the current humidity RH current and target humidity RH target The error e h (t), where e h (t) = RH target -RH current ; Calculate the humidity control amount u h (t), converted to fan speed percentage Fan Speed , output electronic expansion valve opening and fan speed control quantity, where: Therefore, the target temperature determination module receives the temperature setting of the central controller, so that the indoor unit responds quickly to the target temperature; the target humidity determination module receives the humidity setting of the central controller, so that the indoor unit responds quickly to the target humidity; the temperature PID control module calculates the precise opening of the electronic expansion valve based on the error between the target temperature and the current temperature.

[0072] In a preferred embodiment of the present invention, the driving module includes:

[0073] A digital-to-analog converter converts the received opening value and speed value into a corresponding voltage or current signal;

[0074] The driving circuit amplifies the voltage or current signal output by the digital-to-analog converter and drives the electronic expansion valve and the fan according to the voltage or current signal.

[0075] In the embodiment of the present invention, when the driving module is working, it specifically includes: receiving the Valve output by the main control chip Opening and Fan Speed Percentage, converted into standard analog voltage and current signals, for example, assuming the received electronic expansion valve opening value is Valve Opening , the fan speed value is Fan Speed , then: Valve Voltage =(K1×Valve Opening +B1)×5 / / K1, Fan Current =(K2×Fan Speed +B2)×20 / / K2, where Valve Voltage is the control voltage signal of the electronic expansion valve, Fan Current is the control current signal of the fan, K1 is the proportional coefficient of the electronic expansion valve opening to voltage in the digital analog conversion; B1 is the offset of the electronic expansion valve opening to voltage in the digital analog conversion; K2 is the fan speed in the digital analog conversion; ControlVoltage =A1×Valve Voltage / / A1, Fan ControlCurrent =A2×Fan Current / / A2 amplifies the converted analog signal, where A1 is the amplification factor of the electronic expansion valve control voltage in the drive circuit, and A2 is the amplification factor of the fan control current in the drive circuit. ControlVoltage The final control voltage of the electronic expansion valve after amplification, Fan ControlCurrent It is the final control current of the fan after amplification; it determines whether the amplified signal is within the normal range. If it is within the range, the opening or speed control of the electronic expansion valve and the fan is executed; if it is not within the range, the current opening and speed are kept unchanged.

[0076] The embodiment of the present invention converts the received opening value and speed value into standard analog voltage and current signals, which are convenient for amplification and processing of the driving circuit. The conversion relationship can be adjusted by the proportional coefficient and offset, which is suitable for different control requirements. The analog signal output by the digital-to-analog converter is amplified to drive the electronic expansion valve and the fan. The amplification factor can be adjusted to drive different loads. The amplified driving signal has good quality, is stable and reliable, and the valve opening can be accurately adjusted by the driving signal, which is continuously variable and precisely controlled. The speed can be continuously adjusted by the driving signal, and the air volume can be variable and precisely controlled. In summary, the driving module realizes the precise conversion and drive of the digital signal of the main control chip to the actuator, which improves the control accuracy and stability of the system.

[0077] like Figure 3 As shown, the central controller includes:

[0078] A receiving module, used for receiving room temperature and humidity parameters fed back by each indoor unit controller;

[0079] The calculation module calculates the load and operation mode of each room based on the room temperature and humidity parameters fed back by the receiving module and the preset comfort model, and determines the target temperature, target humidity and cooling capacity of each indoor unit;

[0080] A sending module, which sends the target parameters determined by the calculation module to the controller of the corresponding indoor unit;

[0081] A communication module, used for communicating with each indoor unit controller;

[0082] A storage module is used to store the area, layout, and comfort model parameters of each room;

[0083] The display module is used to display the temperature, humidity and operation mode information of each room.

[0084] In the embodiment of the present invention, the temperature and humidity parameters fed back by the indoor unit are received in real time to provide a control basis for the calculation module, the control strategy is intelligently calculated according to the temperature and humidity parameters to achieve optimized control, reasonable parameters are determined in combination with the comfort model, and the calculation results are sent to the indoor unit controller in real time to achieve rapid response; the communication module ensures real-time and reliable communication between the central controller and the indoor unit; the storage module stores relevant parameters to provide data support for the calculation module; the display module displays the system operation status in real time for easy monitoring. In summary, the central controller realizes the optimized coordinated control of the entire system through data collection, intelligent calculation, real-time communication and monitoring display, which greatly improves the intelligence level, energy-saving effect and user experience of the air-conditioning system.

[0085] In a preferred embodiment of the present invention, the calculation module includes:

[0086] The load calculation unit is used to calculate the cooling load of each room according to the area, layout, external temperature and humidity, and number of people in each room, and sort the load of each room according to the priority level and load size;

[0087] A mode determination unit, used to determine the working mode of each room according to the load size and the mode set by the user;

[0088] A parameter calculation unit is used to calculate the target temperature and target humidity of each room according to the room load, working mode, area and comfort model;

[0089] The cooling capacity distribution unit calculates the total cooling capacity of the outdoor unit according to the sum of the loads of all rooms, and distributes the cooling capacity of each room according to the priority and load demand;

[0090] The optimization processing unit dynamically optimizes the distribution of the cooling capacity according to the load change, and adjusts the compressor frequency according to the change of the load demand.

[0091] In the embodiment of the present invention, through F i = a1A i + a2P i + a3(T out , RH out ,...) to calculate the load, where F i is the cooling load of the i-th room, A i is the room area, P i is the number of people in the room, T out is the external temperature parameter, RH out is the external humidity and other parameters, and a1, a2, a3 are coefficients; according to {mode = cooling mode, F i > c1 mode = air supply mode, F i < c2 to determine the operating mode, where c1 and c2 are thresholds; according to T di = f1(F i , A i , comfort model), RH di = f2(F i , A i , comfort model) to calculate the parameters, where T di is the target temperature of the i-th room, RH di is the target humidity of the i-th room, and f1 and f2 are empirical functions; according to to distribute the cooling capacity, where F T is the total cooling load, and F' i is the cooling capacity allocated to the i-th room; according to e(t) = load target - load current u(t) = k p e(t)+ k i ∫e(t)dt + k d × de(t) / dt f = limit(u(t), f min , f max ), where e(t) is the load error, e(t) = load target - load current u(t) - PID control quantity f - compressor frequency, where k p , k i , k d are all PID control parameters, f min is the minimum compressor frequency, f maxis the maximum value of the compressor frequency, e(t) is the temperature error or humidity error; according to minJ(f,F′ i )J=w1J1+w2J2+w3×J3J1=∑ i |F′ i -F i |J2=∑(|Td i -T 目标 |+|RHd i -RH 目标 |)J3=f 2 Optimize the target, where w1, w2, w3 are weight coefficients, J1 is the load balance term, and represents the allocated cooling capacity F′ i and room cooling load F i The error; J2 is the comfort term, Td i Indicates the target temperature and humidity of the room, T 目标 is the target value of thermal comfort, RHd i is the target humidity of the ith room, RH 目标 is the target value of humidity comfort, and J3 is the energy saving item.

[0092] In an embodiment of the present invention, the dynamic cooling load of the room is calculated based on various influencing factors, basic data is provided for the system, the required working mode of the room is intelligently determined according to the load conditions, the comfort level is improved, the target temperature and humidity parameters of the room are calculated, the cooling resources are reasonably allocated, the system load is optimized, the efficiency is improved, the compressor frequency is adjusted in real time, the cooling capacity distribution is dynamically optimized, and the optimal operation of the system is achieved.

[0093] In a preferred embodiment of the present invention, the sending module includes:

[0094] The communication protocol processing unit encapsulates and encodes the control instructions output by the computing module and organizes the data packets according to the format of the predetermined communication protocol;

[0095] A network communication unit transmits data with the communication modules of each indoor unit via a wired network or a wireless network;

[0096] Data cache queue, used to cache sent and received data packets;

[0097] The fault detection unit is used to detect the network communication unit to determine whether the network communication unit is normal.

[0098] In the embodiment of the present invention, the control instructions are encapsulated and encoded, organized into standard data packets, and transmission reliability is ensured. The wired and wireless networks are supported, which is flexible and convenient, with strong scalability. Data packets are cached to prevent transmission blockage and improve communication efficiency. The network communication quality is monitored in real time, and faults are discovered and located in time. In summary, the sending module ensures efficient and stable communication between the central controller and the indoor unit through encapsulation processing, network selection, cache transmission and fault detection, and realizes the reliable sending of control instructions and the effective return of data.

[0099] In a preferred embodiment of the present invention, the fault detection unit includes:

[0100] The connection status detection module is used to set the TCP header source port to a random port and the destination port to the indoor unit port; call the checksum calculation function to calculate the checksum and fill the TCP header; obtain the current time and determine whether the time interval with the last sending is ≥10 seconds; if the interval is ≥10 seconds, call the SendTCP function to send a TCP detection packet; if the interval is <10 seconds, end the process.

[0101] The data transmission detection module is used to obtain the sending message header, extract the protocol and length information; parse the message according to the protocol type, count the number of valid messages, and add them to the total number of sent messages; obtain the receiving message header, extract the protocol and length information; filter invalid messages, parse the valid messages, and add the statistical number to the total number of received messages; obtain the current time and determine whether it is an integer second; if so, calculate the number of packet losses, update the circular queue, and maintain the sliding window; if not, end the process; calculate the packet loss rate in the sliding window; determine whether the packet loss rate exceeds the threshold for three consecutive cycles; if so, record it as a data transmission failure and send an alarm; if not, end the process.

[0102] In the embodiment of the present invention, by constructing a TCP detection packet to detect the network connection status, connection failures can be quickly discovered, the number of sent and received messages can be counted, and the packet loss rate can be calculated. The data transmission quality can be monitored in real time, and the packet loss situation can be continuously monitored using the sliding window technology; fault detection and alarm can timely discover connection failures and data transmission failures, and issue an alarm, which is conducive to problem location and processing, and avoids continuous deterioration of communication quality; the ring queue can effectively store historical statistical data and save storage space; in summary, the fault detection unit ensures the quality of network communication through connection detection and data transmission detection, timely discovers and locates faults, and provides guarantee for stable operation of the system.

[0103] In a preferred embodiment of the present invention, the load calculation unit includes:

[0104] Room information acquisition module, used to obtain room information and the number of heat sources;

[0105] The external parameter acquisition module is used to obtain outdoor temperature, humidity and solar radiation parameters, as well as building parameters such as the thermal conductivity coefficient of the wall;

[0106] The heat transfer calculation module is used to calculate the heat transfer loss of the wall according to the room and outdoor parameters, calculate the heat dissipated by the heat source in the room, and calculate the ventilation and window heat conduction loss;

[0107] The comprehensive calculation module calculates the comprehensive value of heat contribution based on the heat transfer loss of the wall, the heat dissipated by the heat source in the room, and the heat conduction loss of ventilation and windows, and determines the total cooling load of the room;

[0108] The load distribution module distributes the total cooling load of the room to each indoor unit and outputs the cooling load value of each indoor unit.

[0109] In this embodiment of the present invention, the area A of the i-th room is obtained. i and the number of people in the i-th room N i ; Get the outdoor temperature T out , Outdoor relative humidity RH out , solar radiation intensity I and wall thermal conductivity k; according to Q total =∑ i (q 1i +q 2i +q 3i ) + safety factor to calculate the sum of heat transfer losses in all rooms, where q 1i = kA i (T in -T out ) / / Heat transfer of the wall of the i-th room, q 2i =N i Q p / / The heat released by the human body in the i-th room, q 3i =Q v A i / / The heat loss of ventilation in the i-th room, Q v The heat loss caused by ventilation; Q p Heat released by the human body; T in is the room temperature; Q total is the total cooling load of the room; Allocate the total cooling load according to the room area ratio, W i is the weight coefficient of the i-th room; Q i Indicates the cooling load assigned to the i-th room.

[0110] In the embodiment of the present invention, the room area, layout and other information are obtained through the room information acquisition module; the outdoor environmental parameters are obtained through the external parameter acquisition module to calculate the influencing factors of heat transfer loss; the various heat transfer losses are calculated through the heat transfer calculation module to accurately predict the cooling load; the calculation results of each part are integrated through the comprehensive calculation module to accurately obtain the total cooling load.

[0111] In a preferred embodiment of the present invention, the parameter calculation unit includes:

[0112] The temperature parameter calculation module is used to calculate the heat load of the room according to the room area, layout, number of people, and the preset comfort model, calculate the target temperature value of the room according to the heat load size and the user's temperature setting, and determine the cooling capacity according to the difference between the target temperature and the outdoor temperature;

[0113] The humidity parameter calculation module is used to calculate the potential humidity load based on the room area, layout, and number of people. Combined with the user's humidity setting, it calculates the target humidity value of the room and determines the cooling capacity based on the difference between the target humidity and the current humidity.

[0114] The cooling capacity calculation module is used to comprehensively process the cooling capacity of the temperature parameter calculation module and the humidity parameter calculation module, determine the total cooling capacity of the room according to the preset priority and comfort level, and output the opening value of the electronic expansion valve and the speed value of the fan according to the total cooling capacity of the room.

[0115] In the embodiment of the present invention, the room temperature heat load Q is calculated t , where Q t =k1A+k2N+k3I+k4(T in -T out ); According to T target =T set -Kp(T set -T current ) Calculate the target temperature T target ;According to QC t =c1(T target -T out ) Calculate the temperature cooling capacity QC t According to Q h =k5A+k6N Calculate the room humidity heat load Q h According to RH target =RH set -Kp(RH set -RH current ) Calculate the target humidity RH target ;According to QC h =c2(RH target -RH current ) Calculate humidity cooling capacity QC h;According to QC total =w1QC t +w2QC h Comprehensive calculation of total cooling capacity QC total ; According to Valve = map (QC total ), Fan=map(QC total ) is mapped to the valve opening Valve and the fan speed Fan; where k1, k2, k3, k4, k5 and k6 are the calculated temperature heat load Q t Time-related empirical coefficient; T set The temperature setting value set by the user; K p is the proportional coefficient in PID control; T current is the current indoor temperature; c1 is the empirical coefficient for calculating the temperature cooling capacity; RH set is the humidity setting value set by the user; N is the number of people in the room; A is the area of ​​the room; I is the solar radiation intensity; c2 is the empirical coefficient when calculating the humidity cooling capacity.

[0116] In the embodiment of the present invention, the temperature parameter calculation module calculates the target temperature according to the room characteristics and the comfort model to achieve precise temperature control; the humidity parameter calculation module calculates the target humidity according to the room characteristics to achieve precise humidity control; the cooling capacity calculation module comprehensively considers the temperature and humidity control, allocates cooling resources according to priority, and improves comfort; the electronic expansion valve opening control accurately adjusts the refrigerant flow to improve the cooling effect; the fan variable frequency control adjusts the air volume according to the change in cooling capacity, and the control effect is better. In summary, the parameter calculation unit scientifically calculates the control parameters, coordinates the temperature and humidity control, and optimizes the allocation of cooling resources, making the air conditioner operation more intelligent and precise, greatly improving the comfort and energy saving.

[0117] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dual-compression water-cooled cabinet multi-split air conditioning control system, characterized in that: include: Multiple indoor units are installed indoors; An indoor unit controller, arranged in the corresponding indoor unit, for controlling the opening and adjustment of the corresponding indoor unit; The central controller is connected to the plurality of indoor unit controllers respectively, 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; each outdoor unit is 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 the control instruction of the central controller and transmits it to the driving module, the driving module is connected to the electronic expansion valve, the fan and the indoor heat exchanger, and is used to control the opening and adjustment of the electronic expansion valve, the fan and the indoor heat exchanger; the sensor module is used to detect the indoor environmental parameters in real time and feed them back to the main control chip; The main control chip includes: A target temperature determination module receives a target temperature value commanded by a central controller; A target humidity determination module receives a target humidity value commanded by a 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 speed value according to the target humidity and the current humidity fed back by the sensor module, and sends the fan speed value to the drive module. The drive module drives the electronic expansion valve and the fan to run according to the received opening value and speed value respectively; when it is applied specifically, it specifically includes: obtaining the temperature instruction T of the central controller by central_command , determine the target temperature T target , where T target =T central_command ; Get the humidity command RH of the central controller central_command , determine the target humidity RH target , where RH target =RH central_command ; Calculate the current temperature T current With the target temperature T target The error e t (t), where e t (t) = T target −T current ; Calculate the temperature control quantity u t (t), converted to the opening percentage of the electronic expansion valve Valve Opening ,in, , t represents time, represents the integral variable, ; Calculate the current humidity RH current and target humidity RH target The error e h (t), where e h (t) = RH target −RH current ; Calculate the humidity control amount u h (t), converted to fan speed percentage Fan Speed , output electronic expansion valve opening and fan speed control quantity, where: The target temperature determination module receives the temperature setting of the central controller, so that the indoor unit can quickly respond to the target temperature; the target humidity determination module receives the humidity setting of the central controller, so that the indoor unit can quickly respond to the target humidity; the temperature PID control module calculates the opening of the electronic expansion valve according to the error between the target temperature and the current temperature; The driving module comprises: A digital-to-analog converter converts the received opening value and speed value into a corresponding voltage or current signal; A driving circuit amplifies the voltage or current signal output by the digital-to-analog converter and drives the electronic expansion valve and the fan according to the voltage or current signal; The central controller comprises: A receiving module, used for receiving room temperature and humidity parameters fed back by each indoor unit controller; The calculation module calculates the load and operation mode of each room based on the room temperature and humidity parameters fed back by the receiving module and the preset comfort model, and determines the target temperature, target humidity and cooling capacity of each indoor unit; A sending module, which sends the target parameters determined by the calculation module to the controller of the corresponding indoor unit; A communication module, used for communicating with each indoor unit controller; A storage module is used to store the area, layout, and comfort model parameters of each room; Display module, used to display the temperature, humidity and operation mode information of each room; The calculation module comprises: The load calculation unit is used to calculate the cooling load of each room according to the area, layout, external temperature and humidity, and number of people in each room, and sort the load of each room according to the priority level and load size; A mode determination unit, used to determine the working mode of each room according to the load size and the mode set by the user; A parameter calculation unit is used to calculate the target temperature and target humidity of each room according to the room load, working mode, area and comfort model; The cooling capacity allocation unit calculates the total cooling capacity of the outdoor unit based on the total load of all rooms, and allocates the cooling capacity to each room according to priority and load demand; The optimization processing unit dynamically optimizes the cooling capacity according to the load changes and adjusts the compressor frequency according to the load demand changes; The sending module comprises: The communication protocol processing unit encapsulates and encodes the control instructions output by the computing module and organizes the data packets according to the format of the predetermined communication protocol; A network communication unit transmits data with the communication modules of each indoor unit via a wired network or a wireless network; Data cache queue, used to cache sent and received data packets; A fault detection unit, used to detect the network communication unit to determine whether the network communication unit is normal; The fault detection unit comprises: The connection status detection module is used to set the TCP header source port to a random port and the destination port to the indoor unit port; call the checksum calculation function to calculate the checksum and fill the TCP header; obtain the current time and determine whether the time interval with the last sending is ≥10 seconds; if the interval is ≥10 seconds, call the SendTCP function to send a TCP detection packet; if the interval is <10 seconds, end the process; The data transmission detection module is used to obtain the sending message header, extract the protocol and length information; parse the message according to the protocol type, count the number of valid messages, and add them to the total number of sent messages; obtain the receiving message header, extract the protocol and length information; filter invalid messages, parse the valid messages, and add the statistical number to the total number of received messages; obtain the current time and determine whether it is a whole second; if so, calculate the number of packet losses, update the ring queue, and maintain the sliding window; if not, end the process; calculate the packet loss rate in the sliding window; determine whether the packet loss rate exceeds the threshold for three consecutive cycles; if so, record it as a data transmission failure and send an alarm; if not, end the process; The load calculation unit comprises: Room information acquisition module, used to obtain room information and the number of heat sources; External parameter acquisition module, used to obtain outdoor temperature, humidity and solar radiation parameters, as well as the thermal conductivity coefficient of the wall; The heat transfer calculation module is used to calculate the heat transfer loss of the wall according to the room and outdoor parameters, calculate the heat dissipated by the heat source in the room, and calculate the ventilation and window heat conduction loss; The comprehensive calculation module calculates the comprehensive value of heat contribution based on the heat transfer loss of the wall, the heat dissipated by the heat source in the room, and the heat conduction loss of ventilation and windows, and determines the total cooling load of the room; The load distribution module distributes the total cooling load of the room to each indoor unit and outputs the cooling load value of each indoor unit; The parameter calculation unit comprises: The temperature parameter calculation module is used to calculate the heat load of the room according to the room area, layout, number of people, and the preset comfort model, calculate the target temperature value of the room according to the heat load size and the user's temperature setting, and determine the cooling capacity according to the difference between the target temperature and the outdoor temperature; The humidity parameter calculation module is used to calculate the potential humidity load based on the room area, layout, and number of people. Combined with the user's humidity setting, it calculates the target humidity value of the room and determines the cooling capacity based on the difference between the target humidity and the current humidity. The cooling capacity calculation module is used to comprehensively process the cooling capacity of the temperature parameter calculation module and the humidity parameter calculation module, determine the total cooling capacity of the room according to the preset priority and comfort level, and output the opening value of the electronic expansion valve and the speed value of the fan according to the total cooling capacity of the room.

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