What is an open compressor characterized by?

An open compressor is characterized by having an external drive. This type of compressor is typically powered by an outside source, which means the compressor itself does not contain a motor within its housing. Instead, it is connected to an external drive system, such as an electric motor or a steam engine, thereby allowing for more versatility in applications where varying speeds or configurations are beneficial.

This design can be advantageous in industrial settings where different power sources may be utilized, and it often contributes to easier servicing and maintenance because the components are more easily accessible. Understanding the characteristics of open compressors is essential when it comes to selecting the right type for specific applications in heating, ventilation, and air conditioning (HVAC) systems or refrigeration.

The other options discuss features that do not pertain to the defining characteristics of an open compressor, further distinguishing its unique operational structure compared to other compressor types.