Intermediate refrigeration worker skill training device

The intermediate refrigeration skills training device integrates two modules: DC variable frequency air conditioning and frost free refrigerator, equipped with a touch screen controlled variable frequency compressor, electronic expansion valve, 12 channel temperature measurement and control system, and R410A/R600a dual refrigerant circuit. Support process training such as pipeline welding, system pressure and leak detection, vacuum filling, as well as 29 parameter adjustment experiments including superheat/subcooling regulation, refrigeration capacity calculation, electronic expansion valve control, and fault simulation. Equipped with remote monitoring and data reporting functions through a mobile app, suitable for intermediate skill training and assessment of refrigeration workers.

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1、 Product Overview

1Intermediate refrigeration worker skill training deviceIt is a training device specially developed for intermediate level refrigeration related majors in vocational colleges. Based on the intermediate characteristics of the refrigeration industry, it is designed for the installation and maintenance of refrigeration electrical control and refrigeration systems, strengthening students' comprehensive professional abilities in refrigeration system installation, maintenance, repair, debugging, electrical wiring, working condition debugging, fault diagnosis and maintenance.

2、Learn to use software to assist in calculations, easily calculate refrigerant performance (based on thermodynamic and thermophysical data, comparing refrigerants), component calculations, component efficiency calculations, and learn to use software to calculate component parameters, performance coefficients, mass flow rates, piping sizes, and other parameters in various refrigeration cycles

2、 Technical indicators

1. Input power supply: single-phase three wire AC220V ± 10% 50Hz.

2. Working environment: Temperature range of -10 ℃ to -40 ℃, relative humidity ≤ 85% (25 ℃).

3. Equipment capacity: ≤ 1.5KVA.

4. Refrigerants: R410, R600a.

5. The external dimensions are approximately 1600mm × 700mm × 1350mm.

3、 Functional Features

*1Intermediate refrigeration worker skill training deviceIt consists of a DC variable frequency air conditioning compressor, an electronic expansion valve, and an automatic cooling flow control system.

1) The 4.3-inch touch screen can be used to adjust the frequency conversion frequency, frequency adjustment control, and frequency display of the DC compressor, and can complete the frequency conversion frequency change experiment.

2) The 12 channel 4.3-inch touch screen temperature measurement and control system is composed to achieve overheating and supercooling control data experiments. It can be displayed on the control interface.

3) 29 parameter control parameter settings/queries: All control related data within the controller can be modified.

2. The installation of refrigeration pipelines, electrical wiring of refrigeration systems, pipeline pressure leak detection, system vacuum pumping, filling of agents, and operation debugging are integrated.

3. According to the principle of the control circuit of the split air conditioner, the assessment board is printed with the electrical control circuit diagram of the split air conditioner and marked with detection points. Students can understand its principle through the circuit diagram on the assessment board.

4. The overall design adopts an open and detachable structure, allowing students to repeatedly perform system placement, assembly, welding, and pipeline production training on the device. Can complete pipeline process technology, bending production, refrigeration system pressure and leak detection methods, copper pipe and copper iron pipeline welding process technology, system vacuum extraction technology, air conditioning and refrigerator refrigerant filling task experiments.

*5. This device is based on the DC variable frequency split air conditioner and air-cooled refrigerator control circuit, and serves as a training and assessment object, enabling students to proficiently master the control circuit, basic principles, and maintenance techniques of air conditioners.

6. Refrigerator: The refrigerator is designed with frost free air cooling.

7. The cooling capacity can be calculated using the evaporator (condenser) heat balance method based on data.

8. R01 module device

Please scan the software QR code displayed when the host is turned on or download and install the mobile app before adding the device for control and use. Visualized distribution network, innovative IoT distribution network UI interface design, simple and easy to operate, convenient for employees to quickly use equipment: use mobile APP for remote control and measurement without distance limit.

1) The APP data function and intelligent APP control software. Mobile smart life app with network distance control and main synchronous data measurement. Function curve and chart collection table: overvoltage value, overvoltage value, over limit value, over limit recovery delay function. It can also display real-time/historical data such as current measurement, voltage, electrical energy, power data, and power factor data through the APP.

2) Multi mode group management control: One mobile phone can control 112 devices to remotely control and monitor the experimental platform, while supporting multiple mobile phones to control the function of one experimental platform.

3) Language function: Supports Chinese/English language selection

4) Intelligent AI voice control: Control safety can be ensured through intelligent apps, PCOTA Bluetooth on computers, smart terminals such as Tmall Xiaodu, smart speakers, and output functions controlled by all copper magnetic holding relays (static power can be 0).

5) Time sharing measurement: Calculate system display user data and control dynamics separately based on time

*4) Screen flipping function: It can achieve LCD four-way flipping: it can flip left, right, down, and up for easy use.

5) Device functions: voltage AC50-320V, current range 0-100A, power 0-30000W, frequency 0-50HZ, power factor 0.00-1.00PF, measurement accuracy 1.0, WIFI networking support for remote control, voice control support, control output: 1 channel 10A, transition protection: disconnect, undervoltage protection: disconnect.

6) Curve historical data: TFT true color screen IPS high-definition display current measurement, voltage, energy, power data, power factor data

7) APP data: current measurement, voltage, electrical energy, power data, power factor data

8) APP report function: It can provide statistical data such as daily reports, monthly reports, and annual reports. APP function: WIFI networking supports remote control of mobile phones without distance limitation. Through the intelligent APP, remote measurement, remote setting, historical curves, and real-time monitoring of experimental platform safety can be achieved.

9) Overvoltage alarm function protection of the experimental bench: After applying overvoltage, low voltage, and overcurrent thresholds to the experimental bench, the system can emit a dual layer alarm sound through the speaker and display interface to execute and act.

10) TFT true color screen IPS high-definition display,

11) System: including account management, device management, repair management, user management, real-time video monitoring of each classroom, one click preview of the online and operational status of all devices, analysis of device usage and running time.

12) Voltage: Supports voltages of 220V50HZ/380V50HZ

*13) Environmental data: Supports real-time temperature display on the experimental platform and PM2.5 display for ambient air quality.

*14) Provide screenshots of the following safety reports: A. Electric shock intensity and hazard protection safety, B. SEVL circuit, C. Restricted power supply, D. Heating requirements, E. Abnormal operation and protection conditions

4、 Composition of air conditioning system

*1. The table adopts a 70 * 70MM aluminum circular material structure, and the desktop bracket is formed by one-time die casting of aluminum and connected together. Color: Orange. The experimental platform is made of 1.5mm sheet metal and has an L-shaped shape. The indoor unit of the air conditioner is wall mounted and can be hung on the platform.

2. Power module: including residual current circuit breaker, 1 voltmeter (0-250V), and 1 ammeter (0-5A).

3. Air conditioning outdoor unit: composed of a refrigeration compressor, an outdoor fan, a four-way valve, an air conditioning valve, a refrigeration filter, a liquid sight glass, a manual valve, one set of pipelines, one set of refrigeration system pipelines, and two pressure gauges (3.8 MPa).

*4. Control platform: The panel is printed with a circuit schematic, and test points are installed in the main positions. Instruments can be used to measure its working status and diagnose the location of electrical faults.

5. Indoor air conditioning unit: The indoor unit is an integrated transparent organic glass shell, which allows for a clear view of the internal structure, including the air duct, motor, and evaporator.

Fan structure mode: five wire motor, three speed adjustable.

Air supply mode: using standard air duct air supply mode.

Evaporator (area 0.8M2)

6. Intelligent DC Variable Frequency Control System

This includes three main experiments completed by four sets of systems working together to complete the refrigeration compressor frequency conversion experiment, refrigerant flow regulation experiment, and data parameter regulation experiment.

DC variable frequency compressor variable frequency system, 20-100HZ, (touch screen control)

2) Automatic cooling flow control system, supporting 29 data modification controls. (Touch screen control)

3) 4.3-inch intelligent refrigeration compressor control system with touch screen (touch screen control)

4) 12 channels 4.3-inch temperature measurement module, (touch screen control)

7. Frost free refrigerator module:

1) Refrigerator module: The overall design adopts an open and detachable structure, consisting of a refrigeration compressor, refrigeration filter, liquid sight glass, and fan manual valve. It enables students to repeatedly train on system placement, assembly, welding, and pipeline production on this device.

2) Refrigeration system 500MM * 500MM * 300mm: 1 set of pressure gauges (1.5MPa) for piping, compressor, evaporator, condenser, refrigeration system piping, 1 piece (3.5 MPa), etc.

3) Simulated refrigerator box: The internal unit is made of integrated transparent organic glass, and the structure of the internal unit, including the evaporator and temperature controller, can be clearly seen.

5、 Configuration Table:

6、 Project Content
（1） Pipeline and Electrical Training Section
1. The use of specialized tools for refrigeration workers.
2. Bending, welding, expanding, and assembling of refrigeration system pipelines.
3. Pressure maintenance, leak detection, and refrigerant charging of the 410A air conditioning refrigeration system.
4. Electrical analysis and troubleshooting of DC variable frequency air conditioning control circuit.
5. The pressure maintenance, leak detection, and refrigerant charging of the refrigeration system in a frost free refrigerator.
6. Frost free refrigerator vacuum training.
7. Electrical connection of frost free refrigerator circuit.
（2） Refrigeration experiment content
1. Experimental study on refrigerant regulation changes in the refrigeration system when the suction temperature of the compressor is set to be too high or too low.
2. Experimental study on refrigerant regulation changes in the refrigeration system when the set pressure evaporation temperature is too high or too low.
3. Experimental study on refrigerant regulation changes in the refrigeration system when the condensation temperature is set too high or too low.
4. When setting the data experiment for superheat control, the main data system is the impact of cooling and heating.
5. Calculate the cooling capacity of air conditioning using the evaporator (condenser) thermal balance method.
6. External fan malfunction, pressure increase
7. Internal fan malfunction. Low pressure too low
8. Sensor malfunction, system not working
9. System operation failure when frequency is too high
10. 410 refrigerant too much or too little fault
11. Excessive malfunction of throttle valve and regulation experiment
12. The electronic expansion valve has a minor malfunction of being too open. And regulation experiment
13. Four way valve malfunction: heat pump function shutdown
14. Excessive frosting in the refrigerator malfunction
15. Evaporator fan malfunction
16. Excessive refrigerant, compressor malfunction