Control system of air suspension type water chilling unit

Abstract

The invention discloses a control system of an air suspension type water chilling unit. The control system comprises the water chilling unit, a control module, an operation module, a communication module, an acquisition module and a calculation module. By establishing the energy consumption ratio model, combined synchronous control between the indoor end equipment and the water chilling unit is achieved, so that the energy consumption of the water chilling unit is reduced under the condition that the refrigeration requirement of a user terminal is met, the user experience is improved, and energy is saved; meanwhile, the obtaining module is used for collecting environment parameters of the water chilling unit, the total required refrigerating capacity, unit operation parameters influencing the energy consumption ratio of the water chilling unit, the energy consumption ratio, control parameters influencing the water outlet temperature of the water chilling unit and the empirical relation of the refrigerating power of the water chilling unit, and automation and intelligence of the water chilling unit control system are improved; the problems that the real-time performance is poor due to pure manual adjustment and resources are wasted due to the fact that adjustment cannot be conducted in time in the unit operation period are solved, and the energy utilization efficiency of the water chilling unit is improved.

Description

Technical Field

[0001] The invention relates to the technical field of chiller control, in particular to a control system of an air suspension chiller. Background Art

[0002] In the refrigeration industry, there are two types of chillers: air-cooled chillers and water-cooled chillers. According to the compressor, they are divided into screw chillers, scroll chillers, and centrifugal chillers. In terms of temperature control, they are divided into low-temperature industrial chillers and normal temperature chillers. The temperature of normal temperature units is generally controlled within the range of 0 degrees to 35 degrees, and the temperature of low-temperature units is generally controlled within the range of 0 degrees to -100 degrees. Chillers are also called: freezers, refrigeration units, ice water units, cooling equipment, etc. Because they are widely used in various industries, the requirements for chillers are also different. Their working principle is a multifunctional machine that removes liquid vapor through compression or heat absorption refrigeration cycle.

[0003] However, the existing chillers do not take into account the various parameter states of the chiller's own operation, resulting in insufficient control accuracy of the chiller, which greatly causes energy waste of the chiller; at the same time, manual adjustment mainly relies on the operator's experience, and the real-time adjustment is very poor. It cannot be adjusted in time during operation, resulting in energy waste. Therefore, we propose a control system for an air-suspended chiller to solve the above-mentioned problems. Summary of the invention

[0004] The object of the present invention is to provide a control system for an air suspension chiller to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A control system for an air suspension chiller comprises a chiller, a control module, an operation module, a communication module, an acquisition module and a calculation module, wherein the chiller is connected to the control module and the communication module, the communication module and the acquisition module are connected to the calculation module, the calculation module is connected to the control module, and the control module is connected to the operation module, the control module is used to control and adjust the chiller, the operation module is used to operate the control module, the communication module is used to transmit an indoor temperature setting value and an indoor temperature setting value to the calculation module, so as to control the chiller to perform pre-cooling; the acquisition module is used to obtain the indoor ambient temperature of at least one indoor terminal device under startup, the total required cooling capacity of the indoor terminal device, and the unit operation parameters affecting the energy consumption ratio of the chiller; the calculation module is used to determine the target water outlet temperature of the chiller required at the current moment according to the data collected by the acquisition module, so as to keep the indoor temperature and indoor humidity at the preset values; the control module is used to control and adjust the chiller; and the operation module is used to operate the control module.

[0007] As a further solution of the present invention: the calculation module includes a calculation unit, a model building unit, and an output unit. The calculation unit and the model building unit are connected to the acquisition module, the calculation unit is connected to the model building unit, the model building unit is connected to the output unit, and the output unit is connected to the communication module.

[0008] As a further solution of the present invention: the calculation unit is used to calculate the energy consumption ratio of the chiller; the model building unit takes the total required cooling capacity, indoor ambient temperature, unit operating parameters and energy consumption ratio obtained by the acquisition module as input data, and takes the control parameters affecting the outlet water temperature of the chiller as output data to establish an energy consumption ratio model; the output unit outputs the control parameters based on the real-time feedback data of the acquisition module and the real-time calculated energy consumption ratio, using the energy consumption ratio model.

[0009] As a further solution of the present invention: the control module includes a PLC control cabinet, a main motor starting cabinet and a number of transmitters and sensors, the number of transmitters connect the PLC control cabinet and the number of sensors one by one, the PLC control cabinet is used to control various parameters in the air-suspended chiller, and the main motor starting cabinet is used to control the main motor of the chiller.

[0010] As a further solution of the present invention: the chiller includes an evaporator, a compressor, a condenser, a filter and an expansion valve. The compressor is used to compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The condenser cools the high-temperature and high-pressure gaseous refrigerant into a high-pressure liquid refrigerant through heat exchange between cooling water and the high-temperature and high-pressure gaseous refrigerant. The filter is used to filter impurities and particulate matter in the high-pressure liquid refrigerant. The expansion valve is used to adjust the flow rate of the high-pressure liquid refrigerant to convert the high-pressure liquid refrigerant into a low-pressure and low-temperature liquid refrigerant. The evaporator is used for heat exchange between the chilled water and the liquid refrigerant. The refrigerant is converted from liquid to gas to absorb the heat of the chilled water.

[0011] As a further solution of the present invention: the unit operating parameters that affect the energy consumption ratio of the chiller include: evaporator inlet temperature Te_in, evaporator outlet temperature Te_out, condenser inlet temperature Tc_in, condenser outlet temperature Tc_out, compressor load Q and condenser liquid level Lc.

[0012] As a further solution of the present invention: the sampling time and cycle for collecting the operating parameters of the chiller are respectively the same as the sampling time and cycle for collecting the indoor ambient temperature of the indoor terminal equipment.

[0013] As a further solution of the present invention: the total required cooling capacity is calculated according to the number of indoor terminal devices turned on, the target indoor temperature of each indoor terminal device when turned on, and the indoor ambient temperature.

[0014] As a further solution of the present invention: the acquisition module further includes a collection unit and a data processing unit, the collection unit is connected to the data processing unit, and the collection unit and the data processing unit are connected to the calculation module.

[0015] As a further solution of the present invention: the acquisition unit is used to collect the indoor ambient temperature, the target indoor temperature and the unit operating parameters that affect the energy consumption ratio of the chiller; the data processing unit is used to denoise the indoor ambient temperature, the target indoor temperature and the unit operating parameters that affect the energy consumption ratio of the chiller.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The control system of the air suspension chiller establishes an energy consumption ratio model by considering the environmental parameters of the indoor terminal equipment, the total cooling capacity required, the unit operating parameters affecting the energy consumption ratio of the chiller, the energy consumption ratio and the control parameters affecting the outlet water temperature of the chiller, and realizes the joint synchronous control between the indoor terminal equipment and the chiller, so as to reduce the energy consumption of the chiller while meeting the cooling demand of the user terminal, improve the user experience and save energy; at the same time, the acquisition module collects the environmental parameters of the chiller, the total cooling capacity required, the unit operating parameters affecting the energy consumption ratio of the chiller, the energy consumption ratio and the control parameters affecting the outlet water temperature of the chiller and the refrigeration power of the chiller, thereby improving the automation and intelligence of the chiller control system, reducing the poor real-time performance of pure manual adjustment and the waste of resources caused by the inability to adjust the unit in time during operation, and improving the energy utilization efficiency of the chiller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the control system of the air suspension chiller of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the control module in the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the acquisition module in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the calculation module in the present invention. DETAILED DESCRIPTION

[0022] In one embodiment, Figure 1-Figure 4 As shown, a control system of an air suspension chiller comprises a chiller, a control module, an operation module, a communication module, an acquisition module and a calculation module, wherein the chiller is connected to the control module and the communication module, the communication module and the acquisition module are connected to the calculation module, the calculation module is connected to the control module, and the control module is connected to the operation module, the control module is used to control and adjust the chiller, the operation module is used to operate the control module, the communication module is used to transmit the indoor temperature setting value and the indoor temperature setting value to the calculation module, so as to control the chiller to perform pre-cooling; the acquisition module is used to obtain the indoor ambient temperature of at least one indoor terminal device under startup, the total required cooling capacity of the indoor terminal device, and the unit operation parameters affecting the energy consumption ratio of the chiller; the calculation module is used to determine the target outlet water temperature of the chiller required at the current moment according to the data collected by the acquisition module, so as to keep the indoor temperature and indoor humidity at the preset values; the control module is used to control and adjust the chiller; the operation module is used to operate the control module;

[0023] The intelligent control method comprises the following steps:

[0024] Transmitting the indoor ambient temperature setting value and the total required cooling capacity setting value of the indoor terminal equipment to the calculation module;

[0025] The calculation module calculates it through the calculation unit, model building unit and output unit, and controls the chiller to pre-cool, so that the indoor ambient temperature and the total required cooling capacity of the indoor terminal equipment reach the preset value;

[0026] Then, the operating parameter data is transmitted to the control module and the operation module through the communication module, and the control module is operated through the operation module, so that the chiller can be controlled.

[0027] The calculation module includes a calculation unit, a model building unit, and an output unit, wherein the calculation unit and the model building unit are connected to the acquisition module, the calculation unit is connected to the model building unit, the model building unit is connected to the output unit, and the output unit is connected to the communication module;

[0028] The calculation unit is used to calculate the energy consumption ratio of the chiller; the model building unit uses the total required cooling capacity, indoor ambient temperature, unit operating parameters and energy consumption ratio obtained by the acquisition module as input data, and uses the control parameters affecting the outlet water temperature of the chiller as output data to establish an energy consumption ratio model; the output unit outputs the control parameters based on the data fed back in real time by the acquisition module and the energy consumption ratio calculated in real time, using the energy consumption ratio model;

[0029] The energy consumption ratio model is a three-layer network model: the input node is determined by the dimension of the input parameter X, that is, the number of input nodes Nin=9, and the threshold function of each input node selects the Gaussian function; the number of output nodes is determined by the number of control parameters, that is, the number of output nodes Nout=4, and the threshold function of the output node selects the softmax function; the number of intermediate layer nodes can be determined according to the numbers Nin and Nout, and the specific determination method can adopt the determination method well known in the field of neural network technology, which will not be repeated here.

[0030] During the actual operation of the chiller, the input parameters as described above are collected in real time, and after processing, are input into the established energy consumption ratio model for training to determine the parameters in the energy consumption ratio model.

[0031] In addition, during or after model training, an optimization function is used to optimize the model. Here, the optimization function can be selected as the Adam optimization function. Of course, this optimization function is not limited to this optimization function, and other optimization algorithms can also be used, such as BGD, SGD, and MBGD.

[0032] The control module includes a PLC control cabinet, a main motor starter cabinet, and a number of transmitters and sensors. The transmitters connect the PLC control cabinet and the sensors one by one. The PLC control cabinet is used to control various parameters in the air suspension chiller. The main motor starter cabinet is used to control the main motor of the chiller.

[0033] The chiller includes an evaporator, a compressor, a condenser, a filter and an expansion valve. The compressor is used to compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The condenser cools the high-temperature and high-pressure gaseous refrigerant into a high-pressure liquid refrigerant through heat exchange between cooling water and the high-temperature and high-pressure gaseous refrigerant. The filter is used to filter impurities and particulate matter in the high-pressure liquid refrigerant. The expansion valve is used to adjust the flow rate of the high-pressure liquid refrigerant to change the high-pressure liquid refrigerant into a low-pressure and low-temperature liquid refrigerant. The evaporator is used for heat exchange between the chilled water and the liquid refrigerant. The refrigerant is converted from liquid to gaseous state to absorb the heat of the chilled water.

[0034] The unit operating parameters that affect the energy consumption ratio of the chiller include: evaporator inlet temperature Te_in, evaporator outlet temperature Te_out, condenser inlet temperature Tc_in, condenser outlet temperature Tc_out, compressor load Q and condenser liquid level Lc;

[0035] The sampling time and cycle for collecting the chiller operating parameters are the same as the sampling time and cycle for collecting the indoor ambient temperature of the indoor terminal equipment;

[0036] The total required cooling capacity is calculated based on the number of indoor terminal devices turned on, the target indoor temperature of each indoor terminal device when turned on, and the indoor ambient temperature;

[0037] The acquisition module further includes a collection unit and a data processing unit, wherein the collection unit is connected to the data processing unit, and the collection unit and the data processing unit are connected to the calculation module;

[0038] The acquisition unit is used to collect the indoor ambient temperature, the target indoor temperature and the unit operating parameters that affect the energy consumption ratio of the chiller; the data processing unit is used to perform denoising on the indoor ambient temperature, the target indoor temperature and the unit operating parameters that affect the energy consumption ratio of the chiller;

[0039] The present invention establishes an energy consumption ratio model by considering the environmental parameters of the indoor terminal equipment, the total required cooling capacity, the unit operating parameters affecting the energy consumption ratio of the chiller, the energy consumption ratio and the control parameters affecting the outlet water temperature of the chiller, and realizes the joint synchronous control between the indoor terminal equipment and the chiller, so as to reduce the energy consumption of the chiller while meeting the cooling demand of the user terminal, improve the user experience and save energy; at the same time, the acquisition module collects the environmental parameters of the chiller, the total required cooling capacity, the unit operating parameters affecting the energy consumption ratio of the chiller, the energy consumption ratio and the control parameters affecting the outlet water temperature of the chiller and the refrigeration power of the chiller, thereby improving the automation and intelligence of the chiller control system, reducing the poor real-time performance of pure manual adjustment and the waste of resources caused by the inability to adjust the unit in time during operation, and improving the energy utilization efficiency of the chiller.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A control system for an air suspension chiller, characterized in that: It includes a chiller, a control module, an operation module, a communication module, an acquisition module and a calculation module, the chiller is connected to the control module and the communication module, the communication module and the acquisition module are connected to the calculation module, the calculation module is connected to the control module, and the control module is connected to the operation module, the control module is used to control and adjust the chiller, the operation module is used to operate the control module, and the communication module is used to transmit the indoor temperature setting value and the indoor temperature setting value to the calculation module to control the chiller to perform pre-cooling; the acquisition module is used to obtain the indoor ambient temperature of at least one indoor terminal device under startup, the total required cooling capacity of the indoor terminal device, and the unit operating parameters affecting the energy consumption ratio of the chiller; the calculation module is used to determine the target water outlet temperature of the chiller required at the current moment according to the data collected by the acquisition module, so as to keep the indoor temperature and indoor humidity at the preset values; the control module is used to control and adjust the chiller; and the operation module is used to operate the control module.

2. The control system of an air suspension chiller according to claim 1, characterized in that: The calculation module includes a calculation unit, a model building unit, and an output unit. The calculation unit and the model building unit are connected to the acquisition module, the calculation unit is connected to the model building unit, the model building unit is connected to the output unit, and the output unit is connected to the communication module.

3. The control system of an air suspension chiller according to claim 2, characterized in that: The calculation unit is used to calculate the energy consumption ratio of the chiller; the model building unit uses the total required cooling capacity, indoor ambient temperature, unit operating parameters and energy consumption ratio obtained by the acquisition module as input data, and uses the control parameters affecting the outlet water temperature of the chiller as output data to establish an energy consumption ratio model; the output unit outputs the control parameters based on the data fed back in real time by the acquisition module and the energy consumption ratio calculated in real time, using the energy consumption ratio model.

4. The control system of an air suspension chiller according to claim 1, characterized in that: The control module includes a PLC control cabinet, a main motor starting cabinet, and several transmitters and sensors. The several transmitters connect the PLC control cabinet and the several sensors one by one. The PLC control cabinet is used to control various parameters in the air-suspended chiller, and the main motor starting cabinet is used to control the main motor of the chiller.

5. The control system of an air suspension chiller according to claim 1, characterized in that: The chiller includes an evaporator, a compressor, a condenser, a filter and an expansion valve. The compressor is used to compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The condenser cools the high-temperature and high-pressure gaseous refrigerant into a high-pressure liquid refrigerant through heat exchange between cooling water and the high-temperature and high-pressure gaseous refrigerant. The filter is used to filter impurities and particulate matter in the high-pressure liquid refrigerant. The expansion valve is used to adjust the flow rate of the high-pressure liquid refrigerant to convert the high-pressure liquid refrigerant into a low-pressure and low-temperature liquid refrigerant. The evaporator is used for heat exchange between the chilled water and the liquid refrigerant. The refrigerant is converted from liquid to gas to absorb the heat of the chilled water.

6. The control system of an air suspension chiller according to claim 1, characterized in that: The unit operating parameters that affect the energy consumption ratio of the chiller include: evaporator inlet temperature Te_in, evaporator outlet temperature Te_out, condenser inlet temperature Tc_in, condenser outlet temperature Tc_out, compressor load Q and condenser liquid level Lc.

7. The control system of an air suspension chiller according to claim 6, characterized in that: The sampling time and cycle for collecting the chiller operating parameters are respectively the same as the sampling time and cycle for collecting the indoor ambient temperature of the indoor terminal equipment.

8. The control system of an air suspension chiller according to claim 1, characterized in that: The total required cooling capacity is calculated based on the number of indoor terminal devices that are turned on, the target indoor temperature of each indoor terminal device when turned on, and the indoor ambient temperature.

9. The control system of an air suspension chiller according to claim 1, characterized in that: The acquisition module further comprises a collection unit and a data processing unit, wherein the collection unit is connected to the data processing unit, and the collection unit and the data processing unit are connected to the calculation module.

10. The control system of an air suspension chiller according to claim 9, characterized in that: The acquisition unit is used to collect the indoor ambient temperature, the target indoor temperature and the unit operating parameters that affect the energy consumption ratio of the chiller; the data processing unit is used to denoise the indoor ambient temperature, the target indoor temperature and the unit operating parameters that affect the energy consumption ratio of the chiller.

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