CN102418965A - Multifunctional frequency conversion central air conditioner experiment platform - Google Patents

Abstract

A multifunctional variable frequency central air conditioning experimental platform includes a refrigeration system, a control system, and a simulation room. The refrigeration system includes a refrigeration unit, a chilled water system, and a cooling water system. The control system includes a host computer, a slave computer, and a frequency converter. The monitoring module in the host computer collects the temperature, pressure, and flow signals of the experimental platform through the slave computer, and then issues a control command to monitor the operation of the refrigeration system through the slave computer or the frequency converter. The MATLAB module in the host computer can implement the optimization control algorithm, and the MATLAB module and the monitoring module exchange data through the dynamic data exchange mechanism (DDE) or the object connection and embedding standard (OPC) of process control. The refrigeration unit includes a variable frequency compressor, a condenser, and an air-cooled evaporator and a water-cooled evaporator connected in parallel. This experimental platform can simultaneously study the refrigeration effect of the air-cooled evaporator, the refrigeration effect of the water-cooled evaporator, and the refrigeration effect of the variable refrigerant flow multi-connected air conditioning system (VRV air conditioning system), and can provide a verification platform for the implementation of energy-saving optimization advanced control strategies for large variable frequency central air conditioners.

Description

A multifunctional frequency conversion central air-conditioning experimental platform

technical field

The invention relates to a multifunctional frequency conversion central air conditioner experiment platform.

Background technique

With the development of my country's economy, central air-conditioning has been more and more widely used in high-rise buildings such as hotels, hospitals, and large shopping malls. However, the wide application of central air-conditioning brings a lot of energy consumption, accounting for a large part of building energy consumption. In addition, at this stage, the installed capacity of central air-conditioning in my country is often higher than the required load, and most of them have not implemented advanced control of energy-saving optimization, resulting in serious energy consumption. Therefore, it is of great significance to develop a multi-functional frequency conversion central air-conditioning experimental platform capable of monitoring and provide a verification platform for the implementation of energy-saving optimization and advanced control strategies for large-scale central air-conditioning.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multifunctional frequency conversion central air-conditioning experiment platform, which can study the application effect of energy-saving optimization control algorithm in the laboratory.

For this reason, the present invention adopts the following technical solutions: a multi-functional frequency conversion central air-conditioning experimental platform, which is characterized in that it includes a refrigeration system, a control system, and a plurality of simulated rooms; the refrigeration system includes a refrigeration unit, a chilled water system, a cooling water system; the control system includes an upper computer, a plurality of lower computers, and a plurality of frequency converters; the upper computer includes a monitoring module and a MATLAB module; the monitoring module is used to collect the signal of the experimental platform operation by the lower computer , the signal includes temperature, pressure, flow, and then sends a control command to monitor the operation of the refrigeration system through the lower computer or/and through the frequency converter; the MATLAB module can implement an optimal control algorithm; the MATLAB The module and the monitoring module exchange data through Dynamic Data Exchange (DDE) or Process Control Object Connection and Embedded Standard (OPC). The above-mentioned technical solution makes full use of the advantage of MATLAB that it is easy to implement advanced algorithms, and saves the development cost of third-party software.

On the basis of adopting the above-mentioned technical solution, the present invention also adopts or adopts the following further technical solutions in combination:

A multifunctional frequency conversion central air-conditioning experimental platform, the refrigeration unit sequentially includes a compressor, a condenser, and an evaporator; the chilled water system is equipped with a chilled water pump and an air handling unit, and the air handling unit is equipped with an air circulation fan; The cooling water system is equipped with a cooling water pump and a cooling tower fan; the compressor, the chilled water pump, the air circulation fan, the cooling water pump, and the cooling tower fan are all driven by their own variable frequency motors; Each variable frequency motor is controlled by its own frequency converter.

A multifunctional frequency conversion central air-conditioning experimental platform, the evaporator is a parallel air-cooled evaporator and a water-cooled evaporator; the inlet end of the air-cooled evaporator and the inlet end of the water-cooled evaporator are connected in series There is an electronic expansion valve. The electronic expansion valve has a fully closed function. When the electronic expansion valve at the inlet end of the air-cooled evaporator is closed, the cooling effect of the water-cooled evaporator can be verified. When the electronic expansion valve at the inlet end of the water-cooled evaporator is closed, the cooling effect of the air-cooled evaporator can be verified. At the same time, when the two electronic expansion valves are not fully closed, the cooling effect of the variable refrigerant flow multi-connected air conditioning system (VRV air conditioning system) can be verified.

A multifunctional frequency conversion central air-conditioning experimental platform, the condenser is a plate heat exchanger, and the water-cooled evaporator is a plate heat exchanger, which can significantly improve the heat exchange efficiency between refrigerant and water.

A multifunctional frequency conversion central air-conditioning experimental platform, the outlet end of the air handling unit communicates with one of the simulated rooms after passing through the air supply main pipe, the air supply branch pipe, and the air supply air valve actuator; The inlet end of the air handling unit communicates with one of the simulated rooms after passing through the return air main pipe, the return air branch pipe and the return air valve actuator; Lower computer control. The air intake volume of the simulated room is controlled by the respective actuators of the air supply valves; the volume of return air in the simulated rooms is controlled by the respective actuators of the return air valves. The simulated room is made of plexiglass, which is beautiful and transparent, and is convenient for installing various sensors and actuators.

This experimental platform can well simulate the actual operation of large-scale central air-conditioning in the laboratory, and provides a verification platform for the implementation of energy-saving optimization advanced control strategies for large-scale central air-conditioning.

Description of drawings

Figure 1 is a structural diagram of the multi-functional frequency conversion central air-conditioning experimental platform.

Figure 2 is a structural diagram of the control system of the multifunctional frequency conversion central air-conditioning experimental platform.

The symbols in the figure are respectively indicated as follows: 1. Cooling tower, 2. Cooling water pump, 3. Condenser, 4. Compressor, 5. Electronic expansion valve, 6. Air-cooled evaporator, 7. Water-cooled evaporator, 8. Cooling tower fan, 9. Chilled water pump, 10. Air handling unit, 11. Air circulation fan, 12. Air supply pipe, 13. Return air pipe, 14. Air supply supervisor, 15. Return air supervisor, 16. Air supply branch pipe , 17, return air branch pipe, 18, air supply damper actuator, 19, return air damper actuator, 20, simulation room, 21, upper computer, 22, lower computer, 23, RS485 bus, 24, frequency converter.

Detailed ways

The specific implementation manner of the present invention is described in detail by taking two accompanying drawings as examples.

A multifunctional frequency conversion central air-conditioning experimental platform, comprising a refrigeration system, a control system, and a plurality of simulated rooms 20; the refrigeration system comprises a refrigeration unit, a chilled water system, and a cooling water system; the control system comprises a host computer 21, a lower computer 22, frequency converter 24; Described upper computer 21 comprises monitoring module and MATLAB module; Described monitoring module is used for collecting the signal that described experiment platform runs by described lower computer 22, and described signal comprises temperature, pressure, flow, and then Send out control commands to monitor the operation of the refrigeration system through the lower computer 22 or/and through the frequency converter 24; the MATLAB module can implement an optimal control algorithm; the MATLAB module and the monitoring module pass through a dynamic data switch Object Link and Embedded Standard (OPC) for Data Exchange via Control (DDE) or Process Control. The refrigerating unit includes a compressor 4, a condenser 3, and an evaporator in turn; the chilled water system is equipped with a chilled water pump 9 and an air handling unit 10, and the air handling unit 10 is equipped with an air circulation fan 11, and the cooling water The system is equipped with a cooling water pump 2 and a cooling tower fan 8; the compressor 4, the chilled water pump 9, the air circulation fan 11, the cooling water pump 2, and the cooling tower fan 8 are all driven by their own frequency conversion motors ; The variable frequency motors are respectively controlled by their respective frequency converters 24 . The evaporator is an air-cooled evaporator 6 and a water-cooled evaporator 7 connected in parallel; the inlets of the air-cooled evaporator 6 and the inlets of the water-cooled evaporator 7 are each connected with an electronic expansion valve 5 in series. When the electronic expansion valve 5 at the inlet end of the air-cooled evaporator 6 is closed, the cooling effect of the water-cooled evaporator 7 can be verified. When the electronic expansion valve 5 at the inlet end of the water-cooled evaporator 7 is closed, the cooling effect of the air-cooled evaporator 6 can be verified. At the same time, when the two electronic expansion valves 5 are not fully closed, the cooling effect of the variable refrigerant flow multi-connected air conditioning system (VRV air conditioning system) can be verified.

As shown in FIG. 1 , the outlet end of the air handling unit 10 is connected to the air supply main pipe 14 , and the air supply main pipe 14 is divided into several air supply branch pipes 16 , and the air supply branch pipes 16 are respectively connected to respective simulation rooms 20 . The outlet end of the return air main pipe 15 is connected to the air handling unit 10 , the inlet end of the return air main pipe 15 is connected to one end of several return air branch pipes 17 , and the other ends of the return air branch pipes 17 are connected to respective simulation rooms 20 . The air supply volume of the simulated room 20 connected with the air supply branch pipe 16 is controlled by the air supply damper actuator 18 , and the return air volume of the simulated room 20 connected with the return air branch pipe 17 is controlled by the return air valve actuator 19 .

As shown in FIG. 2 , it is a structural diagram of the control system of the multi-functional frequency conversion central air-conditioning experimental platform, including a host computer 21 , multiple slave computers 22 , and multiple frequency converters 24 . The upper computer 21 and the lower computer 22 are connected in the form of RS485 bus 23; the upper computer 21 and the frequency converter 24 are connected in the form of RS485 bus 23.

The upper computer 21 includes a monitoring module and a MATLAB module. Wherein monitoring module runs monitoring software, is used for collecting the signal of described experiment platform operation by described lower computer 22, sends out control command then and monitors described refrigeration system operation through described lower computer 22 or through described frequency converter 24 ; MATLAB software runs in the MATLAB module to implement the optimal control algorithm.

The lower computer 22 can use a programmable logic controller (PLC) or a single-chip microcomputer or a data acquisition and control device. In this embodiment, Advantech's data acquisition and control device ADAM 5000E is used. Among them, the temperature sensor adopts thermal resistance and is connected with the ADAM5013 module; the pressure and flow sensor is connected with the ADAM5017 module; the electronic expansion valve 5 is connected with the ADAM5056 module through its driver chip; the damper actuator is connected with the ADAM5024 module. ADAM5013 module, ADAM5017 module, ADAM5056 module and ADAM5024 module are all connected to ADAM 5000E through ADAM 5000E slot. ADAM5000E is connected with host computer 21 through RS485 bus 23 .

The compressor 4 , the chilled water pump 9 , the air circulation fan 11 , the cooling water pump 2 , and the cooling tower fan 8 are connected to respective frequency converters 24 . The frequency converter 24 is connected with the host computer 21 through the RS485 bus 23 .

The monitoring module in the upper computer 21 collects the temperature, pressure, and flow signals of the experimental platform through ADAM 5000E, and then sends out control commands to monitor the operation of the refrigeration system through ADAM 5000E or through the frequency converter 24. In the upper computer 21, the monitoring module can also exchange data with the MATLAB module through the dynamic data exchange mechanism (DDE) or the process control object connection and embedding standard (OPC); the MATLAB module runs energy-saving optimization advanced control based on the received data Algorithm to obtain various control data, and then send to the monitoring module; after the monitoring module receives the control data sent by the MATLAB module, on the one hand, send the frequency setting value to each frequency converter 24 on the RS485 bus 23, to realize the control Compressor 4, chilled water pump 9, air circulation fan 11, cooling water pump 2, cooling tower fan 8 frequency conversion motors for speed adjustment control; on the other hand, the monitoring module sends control data to electronic expansion valve 5 and air supply through ADAM 5000E Damper actuator 18 and return air damper actuator 19 and other actuators.

The multifunctional variable frequency central air conditioner experiment platform developed by adopting the technical solution of the present invention can provide a verification platform for implementing energy-saving optimization advanced control strategies for large central air conditioners.

The specific implementation above is used to explain the present invention, and it is only a preferred embodiment of the present invention, rather than restricting the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and equivalent replacement made to the present invention , improvements, etc., all fall within the protection scope of the present invention.

Claims (6)

1. a multifunctional variable-frequency central air-conditioning experiment porch is characterized in that it comprises refrigeration system, control system, a plurality of simulations room; Said refrigeration system comprises refrigeration unit, chilled water system, cooling water system; Said control system comprises host computer, a plurality of slave computer, a plurality of frequency converter; Said host computer comprises monitoring module and MATLAB module; Said monitoring module is used for gathering through said slave computer the signal of said experiment porch operation, and said signal comprises temperature, pressure, flow, send then control order through said slave computer or/and said refrigeration system operation is monitored through said frequency converter; Said MATLAB module can be implemented system optimizing control; Said MATLAB module and the said monitoring module object through dynamic data exchanging mechanism (DDE) or process control is connected with embedding standard (OPC) and carries out exchanges data.

2. a kind of multifunctional variable-frequency central air-conditioning experiment porch as claimed in claim 1 is characterized in that said refrigeration unit comprises compressor, condenser, evaporimeter successively; Said chilled water system is furnished with chilled water pump and air-treatment unit, and said air processing machine assembly has air circulation fans; Said cooling water system is furnished with cooling water pump and blower fan of cooling tower; Said compressor, said chilled water pump, said air circulation fans, said cooling water pump, said blower fan of cooling tower drive by variable-frequency motor separately; Said each variable-frequency motor is controlled by said frequency converter separately respectively.

3. a kind of multifunctional variable-frequency central air-conditioning experiment porch as claimed in claim 2 is characterized in that air-cooled evaporimeter and the water-cooled evaporimeter of said evaporimeter for parallel connection; The arrival end of the arrival end of said air-cooled evaporimeter and said water-cooled evaporimeter is in series with electric expansion valve separately.

4. a kind of multifunctional variable-frequency central air-conditioning experiment porch as claimed in claim 3 is characterized in that said water-cooled evaporimeter is a plate type heat exchanger.

5. a kind of multifunctional variable-frequency central air-conditioning experiment porch as claimed in claim 2 is characterized in that said condenser is a plate type heat exchanger.

6. according to claim 1 or claim 2 a kind of multifunctional variable-frequency central air-conditioning experiment porch, the port of export that it is characterized in that said air-treatment unit behind blast main, blowpipe, air-supply air-valve actuator with said a plurality of simulations room in a simulation room be communicated with; The arrival end of said air-treatment unit behind the return air person in charge, return air arm, return air air-valve actuator with said a plurality of simulations room in a simulation room be communicated with; Said each air-valve actuator is respectively by affiliated separately said slave computer control.

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