Which of the following statements is true regarding refrigeration chillers?

Refrigeration chillers operate using a refrigerant that can flow through multiple pathways within the system. In chillers, there are typically two main circuits involving the refrigerant: one circuit that absorbs heat from the environment or process and another circuit that releases heat. This dual-flow system allows for efficient heat exchange and cooling performance.

The correct statement highlights that refrigerant can indeed move through more than just a single pathway—instead, it can adapt to various configurations depending on the design and application of the chiller. This flexibility in the refrigerant path is crucial for maintaining optimal efficiency and operational effectiveness in different cooling scenarios.

While some chillers do utilize shell and tube evaporators, this is not universally true for all types of chillers. Additionally, liquid carryover, where liquid refrigerant travels with the gas refrigerant, can occur but isn't a common feature of well-designed systems. Hence, the option that accurately represents the operational capabilities of refrigeration chillers is that refrigerant paths can be varied, making it a key aspect of their design and functioning.