What happens if the system pressure is too high in a refrigeration system?

In a refrigeration system, if the system pressure is too high, one of the critical effects is that compressor operation may be compromised. High pressure can lead to increased workload and overheating of the compressor, ultimately causing it to operate inefficiently or potentially fail. When the pressure exceeds the design limits, it can lead to issues such as mechanical failures, excessive energy consumption, and reduced reliability of the system overall.

The other choices do not accurately represent the outcomes of elevated system pressure. For example, while increased pressure might theoretically boost energy transfer, it doesn't enhance cooling efficiency because optimal pressure ranges are essential for effective heat exchange. Similarly, suction lines freezing is typically a sign of low pressure or insufficient refrigerant, not high pressure. Lastly, while high pressure may influence the refrigerant’s phase behavior, the statement that refrigerant will not evaporate is not precise because high pressure can alter the evaporation point, but it does not completely prevent it from evaporating. Hence, the most accurate consequence of high system pressure is the potential compromise to compressor operation.