Final answer:
The piston displacement of a reciprocating refrigeration compressor is the volume of refrigerant that can be circulated through all the cylinders per unit time, indicating the compressor's refrigerant moving capacity.
Step-by-step explanation:
The piston displacement of a reciprocating refrigeration compressor is defined as C) the volume of refrigerant that can be circulated through all the cylinders per unit time. This is a measure of the compressor's capacity to move the refrigerant throughout the system and is related to the efficiency and power of the compressor.
Displacement is calculated based on the internal dimensions of the cylinders in the compressor, specifically the diameter (bore) and the distance the piston moves within the cylinder (stroke), as well as the number of cylinders. The displacement gives us an idea of the amount of refrigerant gas that can be moved per cycle of the compressor's operation. High displacement is typically associated with larger capacity and higher cooling potential in refrigeration systems.