ABSTRACT
Chapter 13 describes analytical models to predict the thermal performance of the Oriented Spray Cooling System. Unlike a conventional spray pond in which spray nozzles are arranged in a flatbed and water is sprayed upward, the Oriented Spray Cooling System is an evolutionary spray pond design in which nozzles are mounted on spray trees arranged in a circle and tilted at an angle oriented toward the center of the circle. Each nozzle is exposed to ambient air as water droplets drag air into the spray region while the warm air concentrated in the center of the circle rises, increasing airflow through the spray region. Increased airflow reduces the local wet-bulb temperature of the air in the spray pattern, promoting heat transfer and more efficient cooling. The analytical models described rely on classical heat and mass transfer and kinetic vector relationships for spherical water droplets that rely only on generic experimental thermal performance data. The chapter compares the predicted performance of the Oriented Spray Cooling System with full-scale field test results that were measured at the Columbia Generating Station where the ultimate heat sink is two Oriented Spray Cooling Systems.
