5th Class Power Engineering Practice Exam 2025 – Complete Study Guide

The refrigerant flow control plays a crucial role in managing the amount of refrigerant that enters the evaporator in a refrigeration system. This is important because the evaporator is where the refrigerant absorbs heat from the surrounding environment, thus cooling the area being serviced.

By regulating the flow of refrigerant into the evaporator, the flow control ensures that the evaporator operates within its designed capacity. Too much refrigerant can lead to liquid flooding the compressor, while too little can cause inadequate heat absorption, resulting in poor system performance. Therefore, maintaining the appropriate refrigerant flow supports effective heat exchange and overall efficiency of the refrigeration cycle.

The other aspects mentioned, such as the compressor speed, pressure in the condenser, and temperature of the refrigerant, are influenced by various factors in the system, but the specific role of refrigerant flow control is directly related to the quantity of refrigerant entering the evaporator.