Refrigeration control can be achieved by regulating the flow of refrigerant to the evaporator and also by:

Regulating the output of the compressor is an effective method for controlling refrigeration systems. The compressor plays a crucial role in the refrigeration cycle, as it compresses the low-pressure refrigerant vapor from the evaporator, increasing its pressure and temperature before sending it to the condenser. By adjusting the compressor's output, you can alter the amount of refrigerant being circulated within the system.

When the compressor output is reduced, less refrigerant is pumped into the evaporator, which decreases the cooling capacity and can prevent excessive cooling, especially in applications where the temperature needs to be carefully controlled. Conversely, increasing the compressor output adds more refrigerant to the evaporator, enhancing the cooling effect. This regulation allows for dynamic adjustments based on load conditions, making it a key aspect of effective refrigeration system control.

In contrast, increasing the brine concentration, removing refrigerant, or increasing the level of the receiver are not standard methods for regulating refrigeration in a way that directly affects compressor output and, ultimately, the refrigeration effect. These options might influence other factors in the refrigeration system but do not provide the immediate and effective control that adjusting the compressor output does.