Final answer:
The capacity of an evaporative condenser increases as the entering air wet-bulb temperature decreases because the air's potential to accept moisture is higher, leading to better evaporation and heat transfer.
Step-by-step explanation:
The performance of an evaporative condenser is influenced by the conditions of the air that cools it. Specifically, it is the entering air wet-bulb temperature that significantly affects the condenser's cooling capacity.
When the entering air wet-bulb temperature decreases, the potential for the air to accept moisture increases because of a higher temperature and vapor pressure difference between the air and the water in the condenser. This results in enhanced evaporation and, consequently, better heat transfer from the condenser to the air. In simple terms, this means that the capacity of an evaporative condenser will increase as the entering air wet-bulb temperature decreases.
Therefore, the correct answer to the student's question is (A) the capacity of an evaporative condenser will increase as the entering air wet-bulb temperature decreases.