Which component is primarily responsible for circulating fluid in a refrigeration system?

In a refrigeration system, the primary component responsible for circulating fluid is the brine pump. The brine pump is essential for moving the refrigerant or brine solution through the system, ensuring that heat is transferred effectively between the evaporator and condenser. It facilitates the flow of the refrigerant, allowing the system to maintain the required temperature conditions efficiently.

The compressor, while crucial, primarily serves to compress the refrigerant gas and increase its pressure, thus propelling the refrigerant through the system but not directly circulating it. The condenser's role focuses on rejecting heat from the refrigerant, and the expansion valve’s function is to regulate refrigerant flow into the evaporator by reducing the pressure. Therefore, the brine pump is specifically designed to circulate the working fluid throughout the refrigeration system, ensuring optimal operation and heat exchange.