Which of the following actions can help to improve the efficiency of a refrigeration system?

Regular maintenance of the compressor is essential for improving the efficiency of a refrigeration system. The compressor is a crucial component that circulates the refrigerant through the system, compressing low-pressure refrigerant gas into high-pressure gas, which then releases heat and cools the interior space.

When a compressor is regularly maintained, it operates at optimal levels. This includes checking for proper lubrication, ensuring the motor is in good condition, and verifying that seals are intact to prevent refrigerant leaks. A well-maintained compressor can enhance performance, reduce energy consumption, and lower wear and tear, ultimately resulting in a more efficient refrigeration system. This leads to a more reliable operation and reduced operational costs.

In contrast, other choices might detract from system efficiency. Increasing the refrigerant charge can lead to improper pressure conditions and decreased performance, while reducing airflow across the evaporator can hinder heat exchange efficiency. Finally, disabling pressure controls would create unsafe conditions and also negatively impact efficiency. Thus, the maintenance of the compressor remains the best choice for enhancing the effectiveness of the refrigeration system.