Which factor would be used to determine the capacity of an evaporative condenser?

The capacity of an evaporative condenser is primarily influenced by the amount of heat the entering air can absorb. This factor is crucial because the effectiveness of heat transfer in an evaporative condenser is dependent on the ability of the air to absorb heat from the refrigerant. The greater the heat absorption capacity of the entering air, the more efficient the condenser will be in rejecting heat from the refrigerant, which directly impacts the system's overall performance.

In evaporative cooling systems, low temperatures and low humidity levels in the entering air enhance the heat absorption process. Therefore, understanding the heating capacity of the air allows for proper sizing and operation of the condenser to achieve optimal cooling efficiency. While the other factors like the temperature of the refrigerant, pressure in the system, and humidity of the entering air do have roles in the performance and efficiency of the overall refrigeration system, they do not directly determine the condenser's capacity in the same way that the heat absorption characteristics of the entering air do.