What is a screw compressor economizer

What is a screw compressor economizer

As we all know, in fact, in many refrigeration systems, where screw compressors are used, economizers must be matched. So do you know why screw compressors use economizers? How can economizers play its greatest role? Let's find out with the editor of okmarts.com today!

　　 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.

Economizers are often used in secondary air screw compressor refrigeration systems. When the evaporating temperature is relatively low (below -25℃), the efficiency of ordinary single-stage screw compressors is reduced, the cooling capacity is reduced, and the exhaust The temperature is higher, and the economizer air supply cycle is used to 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.

　　 1. Application of screw-type chiller economizer

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. Especially 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 state during the entire load stage.

　　 2. Application principle of screw-type chiller economizer

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.

　　 In a screw chiller equipped with an economizer, the pressure of the medium-pressure interface is very similar to the intermediate pressure in the two-stage compression. Therefore, the refrigeration compressor of the screw chiller can be directly designed as a system with a supercooling circuit, or a flash tank for two-stage expansion.

　　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.