Experimental study of noise reduction and improved cooling fan performance in a PDP TV

Abstract

The present experimental study addresses fan system noise reduction and improvement in cooling performance in a plasma display panel (PDP) television (TV). The broadband noise in a PDP TV is closely related to system losses. The system losses, mainly due to rear case of the TV near the fan, are reduced by increasing the number of vent holes on the case, preventing secondary leakage flow between the fan and the case and modifying the rear case shape. The discrete noise is mainly related with the inflow conditions therefore, the removal of structures that distort inflow results in a discrete noise reduction. Additionally, the fan rotating speed is reduced because of the increased flow rate and reduced flow fluctuation, which is obtained from the reduction of system loss (resistance). 7.3dB(A) noise reduction and a 10 % increase in flow rate are achieved. The main concepts behind realizing noise reduction are prevention of recirculation flow around the fan and reduction of system loss. (C) Institute of Noise Control Engineering.