The industrial chiller operation system is composed of four basic components: compressor, evaporator, condenser and expansion valve. They are connected in turn by pipes to form a closed system. The refrigerant circulates continuously in the system, changes its state, and exchanges heat with the outside world.

The working principle of the industrial chiller: After the liquid refrigerant absorbs the heat of the cooled object in the evaporator, it is vaporized into low-temperature and low-pressure steam, sucked by the compressor, compressed into high-pressure and high-temperature steam, and then discharged into the condenser. The cooling medium (water or air) releases heat, condenses into a high-pressure liquid, is throttled by the expansion valve to a low-pressure and low-temperature refrigerant, and enters the evaporator again to absorb heat and vaporize to achieve the purpose of circulating refrigeration. In this way, the refrigerant goes through four basic processes of evaporation, compression, condensation and throttling in the system to complete a refrigeration cycle.

In industrial chillers, evaporator, condenser, compressor and expansion valve are the four essential parts in the refrigeration system, among which the evaporator is the equipment for conveying cold energy. The refrigerant absorbs the heat of the object to be cooled in it to achieve refrigeration. The compressor is the heart and plays the role of inhaling, compressing and transporting the refrigerant vapor. The condenser is a device that emits heat, and transfers the heat absorbed in the evaporator together with the heat converted by the compressor work to the cooling medium to take away. The expansion valve throttling and depressurizing the refrigerant, controls and adjusts the amount of refrigerant liquid flowing into the evaporator at the same time, and divides the system into two parts: the high-pressure side and the low-pressure side. In the actual industrial chiller, in addition to the above four components, there are often some auxiliary equipment, such as solenoid valves, distributors, dryers, collectors, fusible plugs, pressure controllers and other components, which are used to improve the operation. of economy, reliability and safety.

In the industrial production process, LNEYA industrial chillers are widely used.

1. In mechanical manufacturing, the low temperature treatment of steel transforms the austenite inside the metallographic structure into martensite and improves the performance of the steel.
2. In the iron and steel and foundry industries, the refrigeration and dehumidification air supply technology is adopted, and the air is first dehumidified by the chiller, and then sent to the blast furnace or cupola to ensure the quality of smelting and castings.
3. In the chemical industry, refrigeration technology is required for gas liquefaction, mixed gas separation, salt crystallization, lubricating oil degreasing, cooling of certain chemical reaction processes, absorbing reaction heat and controlling reaction speed. In addition, petroleum cracking, synthetic rubber, synthetic resin, fertilizer, natural gas liquefaction, storage and transportation also require refrigeration.

The characteristics of chillers for industrial production are relatively large capacity and wide evaporating temperature range. A factory often needs a cooling capacity of several thousand to tens of thousands of kilowatts, and the required evaporating temperature range is also large. Some production processes only need more than 0 °C. Some need to be lower than -40℃.