Abstract
Measurement of fan performance characteristics and sound pressure level of tandem fans is performed. Measured maximum static pressure and maximum volume flow rate of tandem fans are 1.5 and 1.1 times of single fan, respectively. These values are almost constant for fan spacing of 0mm to 70mm. Rotational speed of tandem fans at normal operation condition is almost linier to the input voltage of fan, and that is independent of volume flow rate. When one of the tandem fans is stopped, rotational speed of stopped fan is almost proportional to the volume flow rate produced by the other operating fan. Sound pressure level of tandem fans is reduced by 3 to 5dB by changing fan spacing from 0mm to 70mm.
