Centrifugal chillers play a key role in modern air conditioning systems, especially in large commercial and industrial applications. They are known for their high efficiency and reliability, making them ideal for large-scale cooling. This article will be the working principle, composition, component function, application field and design and selection points of centrifugal chiller.1. The working principle and working process of centrifugal chiller
The working principle of centrifugal chillers is based on the refrigeration cycle, in which the compressor, evaporator, condenser, and expansion valve play a key role. In the refrigeration cycle, the refrigerant is endothermic and evaporated in an evaporator, then compressed by a compressor, subsequently deheated and condensed in a condenser, and finally returned to the evaporator through an expansion valve. This process is constantly cycled to achieve the purpose of refrigeration. Centrifugal chiller to produce 7 -12 chilled water for air handling system and 18 -23 process cooling water. Its cooling method is mainly based on open cooling tower cooling. Compression process: The compressor is the core component that compresses the low-pressure refrigerant gas into a high-pressure gas that powers the entire refrigeration cycle. Heat exchange process: In an evaporator, the refrigerant absorbs heat from the air and evaporatesIn a condenser, the refrigerant releases heat and condenses.
2. The structure and components of the centrifugal chiller
Structure of chiller: The chiller is mainly composed of evaporator, compressor, condenser, expansion valve (throttle orifice plate), oil supply pipe, control cabinet, refrigerant purification equipment and pipeline for transporting cooling medium. 
1. CompressorThe compression of the refrigerant and the increase in pressure are the basis of the entire refrigeration cycle. 
2. Pre-guide vanesInstalled at the impeller suction port, the opening of the pre-guide blades is adjusted by adjusting the angle of the pre-guide blades, so as to adjust the air intake of the refrigerant to meet the change of external load. 
3. a condenserThe high-temperature, high-pressure gas at the outlet of the compressor is cooled to make it gaseous and liquid. 
4. an evaporatorThe liquid refrigerant absorbs heat in the evaporator and changes from liquid to gaseous state. and produce the chilled water required for the process. 
5. a throttle orifice plateThe high-temperature and high-pressure liquid in the condenser is turned into a low-temperature and low-pressure liquid refrigerant into the evaporator. 
6. a diffuserIt can change the size of the diffuser channel according to the size of the flow rate, avoid the occurrence of rotational stall and even surge, so as to solve the problem of sharp increase in noise and vibration. 
7. a motorThe compressor motor is an important part of the compressor, and its main role is to provide power to drive the compressor to work. Normally, a compressor motor is composed of different forms of motors such as electric motors and pneumatic motors, which can convert electrical energy or gas energy into mechanical energy so that the compressor can work normally. 
8. Control centerAll the operating parameters of the unit are monitored, and the unit is automatically controlled according to the monitored parameters.
9. Liquid level sensor, liquid level sensorThe level of the liquid, i.e. the height of the liquid in the container, can be accurately monitored. It can monitor changes in liquid level in real time and transmit this information to other equipment for processing.
10. an oil coolerThe equipment can realize the heat exchange of the two fluid media, so as to reduce the oil temperature and cool the lubricating oil of the unit.
11. an oil separatorSeparation of lubricating oil from the gas at the outlet of the compressor and storage of lubricating oil (oil tank).
12. a safety valveThe function of the safety valve is to protect the safety of the system, when the pressure exceeds the set pressure of the safety valve, the safety valve will automatically open and relieve the pressure to reduce the pressure in the pressure vessel, so as to ensure the normal operation of the system and pipeline, prevent accidents and reduce losses.
13. a microprocessing plateProcessing and analyzing various operating parameters is the foundation of unit control operation.
14. an input and output boardReceives external input to the microprocessor board and sends out each signal according to the microprocessor board commands.
15. a current plateProvide different DC power supplies to each computer board.
16. a displayDisplay the pressure, temperature, current, time, set value and other parameters of the unit.
17. a keyboardIn the Control Center, view and modify each parameter.
18. Temperature sensor and pressure sensorMonitor changes in temperature and pressure and alert when temperature and pressure exceed a safe range to ensure proper operation of the equipment.
19. a current transformerThe function of the current transformer is to convert a large current into a small current through proportion, which can be used for protection, measurement, and other purposes.
20. a power stripConvert the input power into a stable DC power supply for the electronic device to provide normal power to the device**. It converts alternating current into direct current and keeps the output current and voltage within a certain range, thus ensuring that a stable voltage is delivered to the PC board of the control panel.
Fourth, the design and selection of chillers
Centrifugal chillers are widely used in places that require large-scale refrigeration, such as large shopping malls, office buildings, hospitals, factories, and data centers. They are particularly suitable for applications that require continuous, stable refrigeration. Design and sizing are key to ensuring efficient operation of centrifugal chillers. Here are a few elements to consider:Capacity and efficiency: Choose the right model and capacity for your specific refrigeration needs. Energy-saving performance: Consider the unit's energy efficiency ratio (EER) and part-load efficiency (IPLV). Environmental adaptability: to ensure that the unit can operate stably under specific environmental conditions.
5. International and domestic brands
When discussing centrifugal chillers, it is worth mentioning some well-known international and domestic brands whose products are widely welcomed by the market for their high quality and innovative technology. The following are several well-known brands of centrifugal chiller products and their characteristics, as well as their main application items::TraneFeatures: Trane's centrifugal chillers are known for high performance, reliability and long-term durability. These units typically have a high energy efficiency ratio (EER) and excellent part-load performance. Primary Applications: Trane's centrifugal chillers are widely used in large commercial buildings, hospitals, data centers, and industrial facilities. YorkProduct Features: York's centrifugal chillers are known for their efficient operation, advanced control systems, and environmental performance. They are often available in a variety of configuration options to suit different application needs. Main applications: York's chillers are widely used in office buildings, hotels, shopping malls, as well as educational and medical institutions. CarrierFeatures: Carrier's centrifugal chillers focus on energy efficiency and environmental friendliness, and offer a variety of refrigerant options. They are designed to meet stringent energy standards and offer advanced remote monitoring capabilities. Main applications: These chillers are widely used in high-end commercial buildings, large retail malls and industrial refrigeration fields. HaierProduct features: Haier's centrifugal chillers focus on energy-saving, intelligent and user-friendly operation interfaces. These products offer flexible application solutions that can be adapted to the diverse market needs. Main applications: Haier's chillers are mainly used in commercial buildings, residential areas and light industrial facilities. GreeProduct features: Gree's centrifugal chiller is favored by the market for its innovative design, efficient energy consumption performance and excellent stability. These units are often cost-effective and environmentally adaptable. Main applications: Widely used in office buildings, hotels, hospitals, as well as ** air conditioning systems in commercial and residential areas. These brands of centrifugal chiller products have earned a good reputation in the market, not only for their technological innovation and reliability, but also for their ongoing commitment to improving energy efficiency and reducing operating costs. As technology continues to advance and market needs change, these brands continue to play an important role in large-scale projects around the world.
6. Technological innovation of magnetic levitation centrifuge
The magnetic levitation centrifuge is an advanced refrigeration equipment that uses magnetic levitation technology to drive the compressor. Compared with conventional bearing-driven compressors, magnetic levitation compressors are frictionless, low noise and high energy efficiency. How it works: The magnetic levitation centrifuge uses a strong magnetic force to suspend the impeller of the compressor in the air, thus eliminating mechanical contact and friction. This design improves operational efficiency and significantly reduces energy consumption. Energy efficiency and performance: Magnetic levitation technology enables the compressor to be infinitely speed-controlled and to precisely control the refrigerant flow according to the system demand, resulting in optimized energy efficiency. This high efficiency makes the magnetic levitation centrifuge particularly energy-efficient at partial load. Reliability and maintenance: Due to the lack of mechanical friction, the reliability and service life of magnetic levitation centrifuges are greatly improved. At the same time, they require less maintenance than conventional centrifuges, further reducing operating costs. Environmental impact: The high energy efficiency of magnetic levitation centrifuges is essential to reduce energy consumption and mitigate environmental impact, in line with the current global trend towards energy conservation and emission reduction. Applications: Magnetic levitation centrifuges are widely used in places that require high energy efficiency and low noise environments, such as large commercial centers, hospitals, data centers and high-end hotels. With the improvement of energy saving and environmental protection requirements, magnetic levitation centrifuges are more and more widely used in the field of modern refrigeration. Its innovative design and excellent performance make it the future direction of efficient refrigeration.