Refrigeration Plant Operator B Practice Test

What type of evaporator control can be used to prevent system fluctuations?

1. Evaporator dampers

2. Pressure sensors

3. Thermostatic expansion valves

4. Compressor frequency modulation

The correct answer is: Evaporator dampers

Evaporator dampers play a significant role in maintaining steady operation within refrigeration systems by controlling the airflow within the evaporator. By adjusting the position of the dampers, operators can manage the amount of air that enters the evaporator, ensuring that it operates at optimal capacity. This regulation helps to stabilize system performance and prevent fluctuations that could lead to inefficiency or uneven cooling. In contrast, pressure sensors are primarily used for monitoring pressure levels and triggering alarms or control adjustments rather than directly managing airflow. Thermostatic expansion valves primarily control the flow of refrigerant to maintain the desired temperature but do not adjust airflow. Compressor frequency modulation can help in controlling the compressor's speed and capacity, but it may not directly address issues related to evaporator performance variability. Thus, evaporator dampers are specifically suited for mitigating fluctuations associated with airflow in the evaporator section of the refrigeration system.