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  • BS 4857-2(1978) : 1978

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    METHODS FOR TESTING AND RATING TERMINAL REHEAT UNITS FOR AIR DISTRIBUTION SYSTEMS - ACOUSTIC TESTING AND RATING

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  01-01-1978

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Cooperating organizations
    Method
    Section one. General
    1 Scope
    2 References
    3 Definitions
    4 Nomenclature
    5 General test requirements
    6 Instrumentation
    7 Test methods
    8 Rating tests
    9 Reporting of test results
    Section two. Test methods
    10 General
    11 Application
    12 Precision
    13 Instrumentation
    14 Installation
    15 Quantities to be measured
    16 Discrete frequency components
    17 Method of measurement
    18 Determination of sound power level
    19 Background noise
    Appendices
    A Method of testing and rating quiet equipment
    B Quiet air supply for acoustic testing and rating
    Tables
    1 Correction conditions for background noise
    2 Range of accuracy in determining sound power levels
        of broad band sources in reverberation rooms
    3 Bandwidths
    4 Significant discrete frequencies
    5 Number of microphone stations
    6 Standard deviations
    7 Minimum requirements for traverse path
    Figures
    1 Arrangement of equipment for insertion loss test
    2 Typical arrangement for unit-out test
    3 End reflection correction
    4 Arrangement of equipment for generated noise test;
        noise radiated, in direction of outlet
    5 Arrangement of equipment for generated noise test;
        noise radiated, in direction of inlet
    6 Arrangement of equipment for casing radiation test
    7 Example of typical reference sound source
    8 Extrapolation of LW data on octave bands 4, 5, 6 and
        7 below minimum measurable value of 30 dB
    9 Equipment for quiet air supply

    Abstract - (Show below) - (Hide below)

    Describes methods of acoustic testing and rating of terminal reheat units for static terminal attenuation, sound generation, upstream and downstream of the unit and radiation of sound from the casing. Covers references, definitions, nomenclature, general test requirements, instrumentation, test methods, rating tests, reporting of test results, determination of sound power level, and background noise. There are several appendices, tables and figures.

    General Product Information - (Show below) - (Hide below)

    Committee RHE/6
    Development Note Supersedes 76/71260 DC. (07/2005) Reviewed and confirmed by BSI, December 2012. (11/2012)
    Document Type Standard
    Publisher British Standards Institution
    Status Current

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 2204:1979 Acoustics Guide to International Standards on the measurement of airborne acoustical noise and evaluation of its effects on human beings
    BS PD5686(1978) : LATEST THE USE OF SI UNITS
    BS 661(1969) : LATEST GLOSSARY OF ACOUSTICAL TERMS
    ISO/R 1680:1970 Test code for the measurement of the airborne noise emitted by rotating electrical machinery
    BS 4197(1967) : LATEST A PRECISION SOUND LEVEL METER
    BS 848-2(1985) : 1985 FANS FOR GENERAL PURPOSES - METHODS OF NOISE TESTING
    BS 1042(1965) : LATEST
    BS 2475:1964 SPECIFICATION FOR OCTAVE AND ONE THIRD OCTAVE BAND PASS FILTERS
    BS 4857-1(1972) : 1972 METHODS FOR TESTING AND RATING TERMINAL REHEAT UNITS FOR AIR DISTRIBUTION SYSTEMS - THERMAL AND AERODYNAMIC PERFORMANCE
    BS 3638(1987) : AMD 7781 METHOD FOR MEASUREMENT OF SOUND ABSORPTION IN A REVERBERATION ROOM
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