Abstract: Air-cooled frost-free refrigerators have gradually become mainstream products in the market, and the noise of centrifugal fans has become the main noise source affecting the noise of the refrigerator. At present, the noise level of many centrifugal fans in use is quite different, and the operating conditions are different. Based on this problem, research on noise evaluation methods of centrifugal fans for refrigerators has been carried out. Through the fan performance air-dynamic test bench, the test of the air volume of different centrifugal fans at different speeds was completed, and a noise test bench for the centrifugal fan for refrigerators was designed to analyze the noise level of a single fan under variable speed conditions. Finally, by comparing the fan noise characteristic curve under the same air volume, the noise level of the fan is evaluated, which provides a reference for the selection of the centrifugal fan.

Key words: Air-cooled refrigerator, Fan noise, Test bench, Evaluation method