Abstract
The present paper describes the evaluation of Free Cooling System by analyzing its operating data from the factory constructed in cold region. Result from this evaluation, the most appropriate way of the operating system is proposed. It is based on past operating data and the weather information. Moreover, after the system has been operated by this method and the result is examined, the accuracy of the selected procedure will be increased by tuning parameters. It is expected that this operating method will be more effective for the facility management and also Free Cooling System will become popular in cold region.