What does the impeller in a centrifugal compressor primarily force the refrigerant vapor into?

The impeller in a centrifugal compressor is designed to accelerate the refrigerant vapor using centrifugal force. As the vapor enters the impeller, it is spun rapidly, which increases its velocity and pressure. Once the refrigerant vapor has been accelerated, it is directed into the diffuser tube. The diffuser plays a crucial role in converting the high kinetic energy of the vapor into pressure energy, allowing for efficient compression as the vapor moves toward the discharge pipe.

This process is vital for the operation of the compressor and directly contributes to the efficient circulation of refrigerant through the refrigeration cycle. The diffuser tube helps to further manage the flow of the refrigerant vapor, ensuring it is channeled correctly into later stages of the system for optimal performance. Understanding the function of the impeller and the diffuser is essential for comprehending how centrifugal compressors operate within refrigeration and air conditioning systems.