Which of the following is an example of baseline evaporator data?

• A. Entering Air Wet-Bulb Temperature
• B. Suction Pressure
• C. Discharge Pressure
• D. Discharge Line Temperature

Answer: (A)

Baseline evaporator data describe the conditions of the air entering the evaporator, since those inlet conditions determine how much heat the coil must absorb and how the overall cooling capacity behaves. The entering air wet-bulb temperature is the key measure here because it captures both temperature and humidity of the air, which directly influence the amount of heat that the evaporator can remove and the coil’s performance.

The other options relate to the refrigerant side and compressor operation—pressure on the suction side, discharge pressure, and discharge line temperature—which reflect how the refrigerant circuit is performing rather than the evaporator inlet air conditions.