Experimental study on the optimum design of the flow-path system for a low noise indoor package air-conditioner

다국어 초록 (Multilingual Abstract)

This study was carried out with the Taguchi method to find the optimum design condition of an indoor package air-conditioner (PAC)to minimize noise of operation. The goal of this study is to identify the optimum set of the control factors forming the flow-path systemof an indoor PAC. The sound of operation and the number of revolutions of the fan of an indoor PAC were measured according to anorthogonal array of L18(2³×3⁴) and used to find the smaller-the-better quality characteristic among the static characteristic analyses. As aresult, the optimum condition of an indoor PAC for a low noise of operation is a set of <G1 A2 B1 C1 D1 E3 F1>, with the judgmentcriterion of the optimum set based on the sound of operation, the number of revolutions and the cost of production. The sound performanceof an indoor PAC operating under optimum conditions improved 1.8 dBA compared to that of the standard condition, and resultedin a reduction of about 45 RPM in the number of revolutions for the target flow-rate of 18.5 m³/min.

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