Design method of free cooling system by cooling towers

Presents the principle of a tower cooling system. Based on the analysis of ways and concepts in engineering, considers that the system of open cooling towers plus plate heat exchangers is a more economical and practical mode in winter. Discusses the issues such as the feasibility of adopting higher supply water temperature for inner zone in winter, performance curve of cooling tower in winter, selection of switching point between cooling by towers and refrigerators, selection of pumps and refrigerators. Provides  a  design example.