How To Choose The Compressor For Chillers

The air-cooled chiller compressor is one of the main equipment of the chiller, and the correct selection is very important. The refrigeration capacity of the refrigeration compressor and the power of the electric motor in the ratio are closely related to the evaporation temperature and condensation temperature.
The commonly used refrigeration compressors in chiller refrigeration systems are piston and screw compressors. Nowadays, vortex compressors have gradually become a common type of compressor in small cold storage systems.
The condensation temperature and evaporation temperature are the main parameters of a refrigeration compressor, known as the refrigeration condition. After calculating the refrigeration load of the cold storage, the compressor unit with suitable refrigeration capacity can be selected.
General principles for selection
1. The determination of single machine capacity and number should be based on factors such as ease of adjustment and changes in the working conditions of the refrigeration object. For cold storage with high refrigeration load, large compressors should be selected to prevent excessive number of machines. The number of compressors for large air-cooled chillers should not be less than two,
2. When selecting multiple compressors, it is necessary to comprehensively consider the possibility of mutual backup and parts exchange between units. The compressor model between units should adopt the agreed series or the same model.
3. According to the calculation of compression ratio, select the appropriate compressor. For Freon compressors, a single-stage compressor is selected when the compression ratio is less than 10, and a two-stage compressor is selected when the compression ratio is greater than 10.
4. The working conditions of refrigeration compressors should meet the basic design conditions as much as possible, and the working conditions should not exceed the operating range specified by the compressor manufacturer. In today's increasingly mature refrigeration control technology, using microcomputer controlled compressor units is an ideal choice.
5. Due to its high operating efficiency, low noise, and smooth operation, vortex compressors have received attention in recent years and are increasingly being applied in small and medium-sized cold storage projects.
6. Due to its structural characteristics, the volume ratio of a screw compressor varies with the operating conditions. Therefore, screw compressors can adapt to different operating conditions. The single stage compression ratio of screw compressors is large, and they have a wider operating range. Under the condition of an economy, they can achieve higher operating efficiency.