1 Improvement on the Efficiency of Condensing Units: Analysis of the CoolNSave™

The efficiency of condensing units in air conditioning systems can be improved by spraying water into the air flowing over the condensing coils. A device called the CoolNSave ™ was purported to improve the efficiency of a condensing unit by doing just that. Our original hypothesis was that evaporation from the spray would reduce the dry bulb temperature of the air flowing over the condenser. Instead, we found that the effects of evaporative cooling on the air and the evaporation of the water collecting on the fins of the condenser both reduced the temperature of the fins, thereby increasing the heat transfer from the condensing refrigerant