Performance analysis of heat transfer rate and negative air ion application for passive thermosiphon beam system

This paper presents the performance of passive thermosiphon beam (PTB) under various operation conditions. In addition, the application of negative ion generator in PTB system is investigated. The three factors (chilled water flow rate, average temperature difference and fall duct length) that influence the PTB heat transfer rate are tested separately in a thermal isolated room. Meanwhile, the comparison study of negative air ion concentration in different positions and working conditions is demonstrated. The study shows that the heat transfer rate of PTB unit can be improved by adjust the chilled water flow rate and average temperature difference. The utilize of fall duct can enhance displacement ventilation and negative ion generator is a feasible option in the PTB system.