Rotary veins are typically limited to which type of application in ammonia refrigeration?

Rotary veins are designed for specific operating conditions in ammonia refrigeration systems, particularly suited for low stage booster applications. In these applications, rotary vein compressors can effectively handle the lower pressure and temperature conditions typical of the low stages of refrigeration cycles.

Their design allows for a consistent and reliable delivery of refrigerant in scenarios where moderate flow rates and lower rotational speeds are favored, making them efficient in transferring ammonia gas from the evaporator to the compressor. This is critical in low stage applications, as it supports the overall system efficiency while maintaining performance standards necessary to ensure adequate cooling.

In contrast, high stage booster applications would often necessitate compressors that can handle much higher pressures, making rotary veins less suitable. Medium stage applications and high efficiency applications similarly require characteristics that rotary veins do not optimally provide, such as higher compression ratios and more robust designs for varying loads and higher pressures. This further reinforces why rotary veins are specifically advantageous in low stage booster applications within ammonia refrigeration.