電子機器の冗長冷却用タンデム構成ファンの性能特性

概要

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We have measured the fan performance characteristics and sound pressure level of tandem fans suitable for redundant cooling systems of electronic equipment. Maximum static pressure of tandem fans without flow-regulate-plate is 1.5 time of single fan at no fan spacing. It increases with fan spacing and reaches 1.9 time at fan spacing of 400 mm. Maximum static pressure of tandem fans with flow-regulate-plate which is symmetrical to the axis of fans is about 1.9 to 2.0 times of single fan, and it dose not affected by fan spacing. Improvement of performance characteristics is larger with longer flow-regulate-plate that is slightly shorter than fan spacing. For example, the plate length of 75 mm is found to be almost optimum for fan spacing of 100 mm. When one of the tandem fans is stopped, performance characteristics is about 80 to 90 % of single fan, and rotational speed of stopped fan is almost proportional to the volume flow rate of operating fan. Sound pressure level of tandem fans without load at normal operating condition is reduced by nearly 8 dB at maximum by changing fan spacing from 0 mm to 300 mm.
2009-01-01