What are the advantages of using economizers for screw chillers

What are the advantages of using economizers for screw chillers

1. What is an economizer

Economizers are often used in secondary air screw compressor refrigeration systems. Under working conditions with relatively low evaporation temperatures (below -25°C), the efficiency of ordinary single-stage screw compressors decreases, the cooling capacity decreases, and the exhaust The temperature is higher, and the economizer air supply cycle is adopted, which can improve the efficiency of the single-stage screw compression refrigeration cycle, increase the refrigeration capacity, and reduce the compressor discharge temperature. The use of economizer can make the application range of single-stage screw compressor wider and more economical.

　　 2. What are the advantages of using economizers?

The refrigeration compressor of the screw chiller is equipped with a special medium pressure interface for the economizer. In this mode of operation, it directly supplements the air at the end of the compression. Therefore, the cooling capacity, work efficiency and reliability of the screw chiller have a certain degree The promotion. In particular, the designed economizer interface can achieve no compression return loss, so as to ensure that the compressor of the screw chiller maintains its best operating condition during the entire load stage. Quick-freezing refrigeration units are still better.

Because the compression process of the refrigeration compressor of the screw chiller is single-phase when it is working, when the rotor rotates, the refrigerant vapor is directly compressed and sucked into the tooth groove of the compressor, and is transported to the bottom of the corresponding compression space . In the continuous working process, the suction pressure of the refrigerant vapor will be compressed to the condensing pressure as the volume of the element continues to decrease.

　　According to the measurement results, the cooling capacity of the screw chiller has been significantly improved after the supercooling of the liquid refrigerant, especially the effect is more obvious under the high compression ratio. Compared with the increased cooling capacity, the power consumption of the refrigeration compressor of the screw chiller is only slightly increased, thereby achieving a greater energy efficiency ratio. To change ammonia to fluorine, condensate is used, and the screw sets are connected in parallel.

　　 The economizer is a heat exchanger that absorbs heat through the refrigerant's own throttling and evaporation, so that another part of the refrigerant is subcooled. It is often used in the refrigeration system of a secondary air-intake screw compressor. When the evaporating temperature is relatively low (below -25℃), the efficiency of the ordinary single-stage screw compressor is reduced, the cooling capacity is reduced, and the exhaust temperature is relatively low. High, the use of economizer air supplement circulation can improve the efficiency of the single-stage screw compression refrigeration cycle, increase the refrigeration capacity, and reduce the compressor discharge temperature. The use of economizer can make the application range of single-stage screw compressor wider and more economical. If the pistons are connected in parallel, new ones are selected.