Georgia Southwestern State University

EvaporCool pre-coolers were installed on a Carrier Air-Cooled Chiller. The project demonstrated the peak-time energy savings, energy savings per year and dollar savings per year for a con¬denser air pre-cooler.


Prior to Evaporcool, the existing chiller system experienced multiple compressor failures, extremely high liquid line and condenser temperatures, and constant loss of capacity from compressors shutting off due to high head pressures.


Evaporative pre-coolers are effective retrofits to reduce the temperature of air that cools the condenser coil in air-cooled chillers, RTUs and other DX equipment. In these systems, the outside air stream passes over a wetted surface before it reaches the condenser, heat from the outside air is absorbed by water evaporation thus cooling the air stream. Evaporative condenser pre-coolers are applicable to most all climate zones, but have even more energy impact in lower humidity areas, such as California.

Evaporcool is one such evaporative condenser-air pre-cooler. The system uses a microprocessor controller to manage the spray of filtered domestic water onto an evaporative media. The flow rate of water delivered changes with outside air temperature and relative humidity so that the system delivers roughly only as much water as is needed for evaporation. The system has no sump, and no drain or water bleed.