What is the coil suction header pressure at abnormal conditions?

The coil suction header pressure reflects the temperature and pressure relationship in a refrigeration system and is crucial for understanding how efficiently the system is operating under various conditions.

The selected answer, which indicates a coil suction header pressure of 17°F, aligns with expected values for a refrigeration system operating under abnormal conditions, such as a high load or a low refrigerant charge. At this temperature, the corresponding suction pressure can efficiently facilitate the absorption of heat from the refrigerated space while maintaining system function.

In this context, the temperature is significant because cooler suction temperatures help ensure the refrigerant can absorb more heat effectively. This is particularly vital in systems where the evaporator is responsible for maintaining low temperatures in the stored products.

The other choices represent temperatures that are either too low or too high for typical operational standards in refrigeration systems. These extreme values could indicate potential issues with the system's efficiency, such as flooding or insufficient heat absorption, which would not provide optimal operation for industrial refrigeration applications.