DYLR-538 Refrigeration Performance Test Experimental Platform

Release time：2024-06-18 22:00viewed：times

The " Refrigeration Performance Test Tr*ning Device" adopts a steam compression refrigeration cycle system, equipped with fully enclosed refrigeration compressors, condensers, evaporators and other real refrigeration system components, and is equipped with intelligent temperature regulators, flow meters, pressure gauges, voltmeters, ammeters and other measuring instruments. Not only can it provide tr*ning on the determination of refrigeration compressor performance parameters, but it can also conduct demonstration tr*ning on the basic principles of refrigeration cycles. It is suitable for teaching and tr*ning of refrigeration major-related courses in vocational colleges.
I. Device Features
1. This tr*ning device is established in accordance with the international standard GB/T 5773-2004 volumetric refrigeration compressor performance tr*ning method, with the "evaporator liquid refrigerant circulation method" as the m*n measurement and the "*r-cooled condenser calorimeter method" as the auxiliary measurement
2. Using a 1-horsepower refrigeration unit, an *r-cooled condenser and a transparent plastic evaporator, the phenomenon of the refrigerant changing from liquid to gas can be observed; The system has a compact structure, a reasonable layout, and a beautiful shape. It can study various flows of refrigerants in the circulation pipeline, including the reflux in the compressor.
3. Provide three different throttling expansion valves, namely: constant pressure expansion valve, constant temperature expansion valve, capillary expansion device, which can compare the expansion effect of refrigerant in each of them.
4. Equipped with voltage leakage protection, current leakage protection, overcurrent protection, overload protection, grounding protection, which can effectively protect people and equipment.
II. Technical performance
1. Input power: single-phase three-wire ~ 220V ± 10% 50Hz
2. Working environment: temperature -10℃ ~ +40℃ relative humidity <85% (25℃) altitude <4000m
3. Device capacity: <2.5kVA
4. Refrigerant: R22
5. Cooling capacity: 1.3kW
6. Weight: 100kg
7. Dimensions: 120cm×60cm×142cm
III. Basic configuration and function
1. Control panel
It adopts double-layer matte dense spray structure with novel shape. The refrigeration system is arranged on the top layer, which can intuitively display the structure of the refrigeration system; the power control and measuring instrument function board is set on the front. The bottom is equipped with four universal wheels with brakes for easy movement and fixation. It can intuitively demonstrate some physical concepts, such as latent heat, superheat, saturation temperature, the relationship between pressure and temperature change, and the boiling of liquid below zero, so as to strengthen students' understanding of these concepts.
2. AC control unit
Single-phase three-wire 220V AC power supply, the total power supply is controlled by the leakage current protector, and the operating current is 30mA
3. Refrigeration system
1 HP open compressor, *r-cooled condenser, sight glass, dry filter, manual throttle valve, liquid storage tank and dry evaporator
(1) 2 ammeters (accuracy 0.5 level)
(2) 4 digital temperature meters (accuracy 0.5 level)
using PT100 platinum resistance as sensor , with a measurement range of -50 to 150℃. Switching through the keyboard, a total of 4 groups of temperature parameters are measured, namely compressor suction port temperature, compressor exhaust port temperature, condenser outlet temperature, and evaporator inlet temperature.
2 vacuum pressure gauges (accuracy level 2.5)
with a range of -0.1～1.5MPa and -0.1～3.5MPa, respectively, measure the low-pressure side pressure and high-pressure side pressure of the refrigeration system in real time
4. Provide three different expansion valves (constant temperature type, constant pressure type, capillary type)
6. Control instrument
1 high and low pressure controller: real-time monitoring of the low-pressure side pressure and high-pressure side pressure of the refrigeration system. When the high pressure is higher than the set value or the low pressure is lower than the set value, the controller sends a control signal to cut off the power supply of the compressor
7. Single-chip microcomputer , PLC programmable design and control virtual simulation software:
This software is developed based on unity3d, with built-in experimental steps, experimental instructions, circuit diagrams, component lists, connection lines, power on, circuit diagrams, scene reset, return and other buttons. After the connection and code are correct, the start/stop, forward motion, and reverse motion buttons can be used to operate the 3D machine tool model movement. When the line is connected, the 3D machine tool model can be enlarged/reduced and translated.
1. Relay control: Read the experimental instructions and enter the experiment. By reading the circuit diagram, select relays, thermal relays, switches and other components in the component list and drag and drop them into the electrical cabinet. The limiter is placed on the three-dimensional machine tool model. You can choose to cover the cover. Some component names can be renamed. Then click the connect line button to connect the terminals. After the machine tool circuit is successfully connected, choose to turn on the power and operate. If the component or line connection is wrong, an error box will pop up. The scene can be reset at any time.
2. PLC control: The experiment is the same as relay control, and the PLC control function is added. After the connection is completed, enter the program writing interface through the PLC coding button. Write two forward and reverse programs. There are 12 ladder diagram symbols in total. After writing, select Submit for program verification. After successful verification, turn on the power to operate. If there are component, line connection, and code errors, an error box will pop up. The scene can be reset at any time.
3. Single-chip microcomputer control: The experiment is the same as the relay control, with the single-chip microcomputer control function added. After the connection is completed, enter the programming interface through the C coding button, enter the correct C language code, submit the verification successfully, turn on the power to operate, and the component, line connection, and code errors will pop up an error box. The scene can be reset at any time.
IV. Practical tr*ning projects
1. Familiar with the basic structure and working principle of the vapor compression refrigeration cycle system
2. Understand the performance and use of the international standard GB/T5773-2004 positive displacement refrigeration compressor
3. Use the evaporator liquid refrigerant circulation method (m*n measurement method) to calculate the refrigeration capacity of the refrigeration compressor
4. Using the water-cooled condenser heat balance method (auxiliary measurement method) to calculate the refrigeration capacity of the refrigeration compressor
5. Calculation and analysis of the relative error of the m*n and auxiliary measurement refrigeration capacity
6. Calculation and analysis of the energy efficiency ratio of the refrigeration unit
V. System configuration table

Serial number	name	quantity	model
1	Open compressor unit	1	2Q-3
2	Electric Motor	1	1KW
3	Constant pressure expansion valve,	1	2A
4	Thermostatic Expansion Valve	1	2A
5	Pressure gauge	2	3.5MP
6	Temperature Controller	1	DF-457
7	Liquid sight glass	1	3/8
8	Hand valve	6	3/8
9	Digital temperature gauge set	6	220V
10	sensor	6	PT100
11	Air cooling module	1	2P
12	F12		One bottle for the whole room
13	Liquid filling tube
13	Double meter valve group	1	FE365
14	Experimental Instructions	1

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