What type of application are rotary vanes limited to in ammonia refrigeration?

Rotary vanes are specifically designed for use in low stage "booster applications" of a two-stage ammonia refrigeration system due to their ability to handle the specific operating characteristics and pressures associated with these applications. In a two-stage system, the low stage operates at a lower pressure and temperature, which is ideal for rotary vane compressors designed to efficiently compress refrigerants like ammonia under these conditions.

The construction and operational characteristics of rotary vane compressors allow them to perform effectively with the low-pressure refrigerant in the low stage of a two-stage system, where they can provide the necessary compression for maintaining system efficiency. This context is vital because refrigerant management in refrigeration systems is crucial for energy efficiency and operational reliability.

Different applications for rotary vanes, such as high-stage applications or in a single-stage setup, may involve operating conditions outside the optimal performance range for these types of compressors, potentially leading to inefficiencies or reliability issues. Thus, the selection of rotary vanes is fundamentally suited to low stage booster applications in a two-stage system.