Abstract: The noise of air conditioning products, as the most direct experience for consumers, directly affects their choices. Among them, sound power level can better measure the comprehensive sound impact of air conditioners on the surrounding space during operation and has been studied. Research on the sound power level of split air conditioners is conducted based on both theoretical analysis of test methods and experimental testing. The research results show that the measurement of sound power level is limited by the surrounding sound field and available instruments, and the appropriate test method should be selected based on the type, installation position, and specific dimensions of the air conditioner under test; the sound power level is positively correlated with the rotational speed of the indoor and outdoor fans, but has no obvious linear relationship with the compressor frequency. The research results aim to provide test methods for the sound power level of split air conditioners and provide data support for the dynamic relationship between the sound power level and various influencing factors.

Key words: Split air conditioner, Sound power level, Six-sided method, Hemispherical method, Envelope surface area