18-15: Closing The Loop – Which Method is Best for Your System

Closed loop cooling systems deliver many benefits compared to traditional open loop systems, such as reduced fouling, less risk of fluid contamination, lower maintenance, and increased system reliability and uptime. Several methods are used to close the cooling loop, including the use of an open circuit cooling tower coupled with a plate & frame heat exchanger or the use of a closed-circuit cooling tower. This study examines the total installed cost using these two alternatives, including equipment, material, and labor costs. Additionally, this study will contrast the operational and maintenance aspects of the two designs to help system designers and operators make the best heat rejection choice for their next project.