ZM8104 Central multi-evaporator refrigeration bench Teaching Education Equipment For School Lab Condenser Trainer Equipment
1 Product Overview
Cold storage is a type of refrigeration equipment. Cold storage refers to the use of artificial means to create an environment different from the outdoor temperature or humidity, and it is also a constant temperature and humidity storage equipment for food, liquid, chemical, pharmaceutical, vaccine, scientific experiments and other items. Cold storage is usually located near the shipping port or origin. Compared with refrigerators, cold storage has a larger cooling area and has a common cooling principle.
This course is a professional course for the major of thermal energy and power engineering. It aims to systematically introduce the principles of refrigeration and refrigeration to students, so that students can grasp the composition, characteristics and thermodynamic calculation methods of various refrigeration cycles, and conduct vapor compression refrigeration as the main line. Explanation, the principle part focuses on theoretical analysis, and the equipment part focuses on explaining the structure, characteristics and selection operations of various refrigeration equipment, and also lays the foundation for students to further study other professional courses.
2 Features
The training platform adopts an aluminum profile chassis frame structure, which is simple and firm in structure. It reduces the overall weight of the equipment while ensuring the overall strength of the equipment. Universal wheels are installed at the bottom, which can be easily moved.
The equipment has a good security protection system. The power supply of the system is controlled by a leakage circuit breaker to protect the safety of the compressor and the system; in the electrical control circuit, the emergency stop button and reliable grounding protection measures can ensure the safety of equipment and personnel.
The experimental equipment is all installed on the profile substrate, which is convenient for observation in the experiment. It is convenient to record the test process.
The whole cold storage is composed of cold storage boards. At present, polyurethane and polystyrene resin are used. Most of the small cold storages are composed of polyurethane cold storage boards. The thermal insulation effect is obvious. 3 Principles of basic equipment of cold storage
The method of storing fruits in mechanical cold storage is to install mechanical cold storage units in a well-insulated building, and artificially adjust and control the cold storage system according to the requirements of fruit varieties for storage temperature, humidity and ventilation. The longer the storage time, the better the effect.
The principle of mechanical cold storage refrigeration. The mechanical cold storage uses a liquid (refrigerant) with a very low vaporization temperature to evaporate it into a gas under low pressure, thereby absorbing heat and achieving the purpose of cooling.
In addition to the low boiling point, the refrigerant used in the cold storage is also required to be harmless to human organs, not corrosive to metals, without the danger of burning and explosion, not chemically reacting with lubricants, and should also have good heat absorption performance, evaporation It has a lot of heat absorption, low pressure in the high-pressure condensing system, low viscosity and low price.
4 Completable Instructions
Identification of refrigeration system components with two refrigerator compartments
Debug and run verification
Investigate the basic concept of a refrigeration unit using R404A with triple evaporation.
Enthalpy Diagram Study of Thermodynamic Cycles.
Research on Neutral Zone Regulation
Calculate the cooling capacity of the condenser and evaporator.
Preventive and Therapeutic Maintenance
The function and adjustment of constant pressure valve oil circuit research
5 Technical parameters
(1) Input power: 380V±10% 50Hz;
(2) Working conditions: ambient temperature 10 ℃ ~ 30 ℃ relative humidity <75% (25 ℃); 6 Experimental operation
1. Turn on the circuit breaker inside the power box, and turn the load switch on the panel to the "on" position.
2. Open all hand valves of the equipment pipeline to make the pipeline unblocked.
3. The temperature of the 4°C refrigerator and -20°C freezer reaches the compressor startup temperature set by the thermostat.
4. Set the speed of the condenser and start the fan according to the experimental ambient temperature (recommended setting should not be less than 30%).
5. Click the start button to start the three compressors for cooling operation.
6. View the current operating parameters of the refrigeration system through the touch screen, including flow, temperature and the operating status of each component.
7. Record the data.
8. If the fault indicator flashes during the experiment, click the fault list in the lower right corner of the touch screen to view the specific fault. Solve the corresponding fault according to the fault name
Note: The fault indicator light will go out only after the fault is resolved.
