ASTM WK57714

    New Practice for estimation of UV irradiance received by samples as a function of location, orientation and tilt

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    Developed by Subcommittee: G03.09 | Committee G03 | Contact Staff Manager



    WK57714

    1. Scope

    The sub-committee recognizes the opportunity to standardize these practices and proposes to put forward: 1.A set of equations used to calculate the direct and diffuse total solar radiation and total UV radiation, as a function of position, orientation and tilt angle 2.A method to separate the UV-B, UV-A components of the global horizontal irradiance from the TMY data to be used as inputs in these equations 3.An agreed upon conversion method to estimate the equivalent accelerated weathering test duration in standard weathering cycles, based on UV dose. Other factors contribute to the acceleration of aging, such as temperature and moisture, which are not accounted for in such calculators. The standard will include the appropriate disclaimers. Future development might include these factors, in a more comprehensive climate and acceleration factor calculation.


    Keywords

    solar, ultraviolet, irradiance, modelling

    Rationale

    Many different companies and academic researchers use commercial or in-house UV calculators to estimate yearly UV dose received by samples as a function of location, orientation and tilt angle. These calculations are used to roughly estimate service life based on dose to failure in laboratory or natural weathering experiments. The sub-committee recognizes the opportunity to standardize these practices and proposes to put forward: 1.A set of equations used to calculate the direct and diffuse total solar radiation and total UV radiation, as a function of position, orientation and tilt angle 2.A method to separate the UV-B, UV-A components of the global horizontal irradiance from the TMY data to be used as inputs in these equations 3.An agreed upon conversion method to estimate the equivalent accelerated weathering test duration in standard weathering cycles, based on UV dose. Other factors contribute to the acceleration of aging, such as temperature and moisture, which are not accounted for in such calculators. The standard will include the appropriate disclaimers. Future development might include these factors, in a more comprehensive climate and acceleration factor calculation.

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    02-07-2017

    Technical Contact:
    Olivier Rosseler

    Item:
    001

    Ballot:
    G03.09 (19-01)

    Status:
    Negative Votes Need Resolution