GB/T 9068-2025 Determination of sound power levels of refrigeration and air-conditioning equipment—Sound pressure methods

Scope

This document defines the terms and definitions for the measurement of noise power levels in refrigeration and air conditioning equipment, specifies the requirements for testing environments and instruments, and provides methods for installing and operating the equipment under test, measuring sound pressure levels, and calculating sound pressure levels and sound power levels. This document is applicable to the measurement of sound power levels in refrigeration systems and heat pumps, devices, and components that create comfortable human environments, specific artificial environments, process flow conditions, and meet specific temperature and humidity requirements, flow rate, and air quality control and regulation. The methods for measuring sound power levels include the measurement in an approximately free sound field using a reflecting plane, measurement in a soundproof room and semi-soundproof room, and comparison measurement in a hard-wall test chamber under a reverberation field, as well as direct measurement in a reverberation field. The measurement methods in a soundproof room and semi-soundproof room (precision level) are applicable to a frequency range of 1/3 octave bands from 100 Hz to 10,000 Hz.

Development Information

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