GB/T 9068-2025Determination of sound power levels of refrigeration and air-conditioning equipment - Sound pressure methods (English PDF)

1 Scope

This document defines the terminology and definitions for measuring the sound power level of refrigeration and air conditioning equipment, specifies the testing environment and instrument requirements, and provides...

Methods for the installation and operation of the tested equipment, the measurement of sound pressure level, and the calculation of sound pressure level and sound power level.

This document applies to temperature, humidity, and flow conditions used to create comfortable human environments, specific artificial environments, technological processes, and specific heating and cooling requirements.

The sound power level of refrigeration systems and heat pumps, devices, and components used for quantity, air quality control, and regulation is measured. Methods for measuring sound power level include reverse...

Measurement of approximately free-field sound in a reverberant plane, measurement of anechoic chambers and semi-anechoic chambers, comparative method of hard-walled test chamber under reverberation field, and direct method of reverberation field measurement.

The measurement method for anechoic chambers and semi-anechoic chambers (precision grade) is applicable to a frequency range of 100Hz to 10000Hz, which is 1/3 octave band.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 3241-2010 Electroacoustic octave and fractional octave filters

GB/T 3767 Engineering method for determining the sound power level and sound energy level of a noise source using acoustic pressure method in an approximately free field above a reflecting surface.

GB/T 3785.1-2023 Electroacoustic sound level meters - Part 1.Specifications

GB/T 4129-2003 Acoustics - Performance and calibration requirements of standard sound sources used for sound power level measurement

GB/T 6881-2023 Acoustic pressure method for determining the sound power level and sound energy level of a noise source - Precision method using a reverberation chamber

GB/T 6881.2-2017 Acoustic pressure method for determining the sound power level and sound energy level of a noise source in a reverberant field.

Engineering method, hard-walled test chamber, comparative method

GB/T 6882-2016 Acoustic sound pressure method for determining the sound power level and sound energy level of a noise source - Precision method using anechoic chambers and semi-anechoic chambers

GB/T 15173-2010 Electroacoustic calibrators

JB/T 7249 Terminology for Refrigeration and Air Conditioning Equipment

3 Terms and Definitions

The terms and definitions defined in GB/T 3767, GB/T 6881, GB/T 6881.2, GB/T 6882 and JB/T 7249, as well as the following terms and definitions, apply.

In this document.