A closed circuit cooler is a heat rejection device that maintains complete separation between the cooling water loop and the air stream, preventing water contamination and drift. Also called closed-loop coolers, these units combine cooling tower principles with a secondary heat exchanger to protect equipment and water quality.
Technical Specifications
The system contains an internal finned tube bundle where process fluid circulates, surrounded by falling water that cools the tubes. Cooler design prevents water loss and drift typical of open cooling towers, eliminating environmental discharge concerns. Typical cooling capacities range from 50 to 5,000 tons. Operating ranges span 40°F to 90°F approach temperatures depending on ambient conditions.
Applications and Advantages
Closed circuit coolers suit applications requiring clean water circulation, such as pharmaceutical manufacturing, data centers, and industrial processes. They require minimal water treatment, occupy less space than equivalent open towers, and eliminate visible vapor plumes. Installation costs are 20-30% higher than open towers, but reduced chemical expenses and water consumption often justify the investment over 10-15 year service life.