Solar irradiation and coincident dry bulb temperature selection for load calculations, an initial investigation

Geoff Levermore, D Chow

    Research output: Contribution to journalArticle

    Abstract

    Traditionally in the determination of heat loads in summer, internal solar heat gains are calculated using near-extreme solar irradiation data. The latter are typically from the ASHRAE Handbook of Fundamentals clear sky model in the Fenestration Chapter. Using these and other gains, the plant is then sized based on the synoptic weather data (dry- bulb, wet-bulb etc) near-extreme values. These are based on the values in the ASHRAE Handbook of Fundamentals using 0.4%, 1.0% and 2% exceeded values. Combining independent near extreme-values and modelled data can lead to more severe design conditions than are likely in reality. A method of determining solar and synoptic near-extreme values from measured values is proposed based on examination of the cumulative distribution functions. Examination shows the method to be robust and sensitive to changes in weather parameters. Such a method is also likely to provide more realistic design conditions.
    Original languageEnglish
    Pages (from-to)690-696
    Number of pages7
    JournalASHRAE Transactions
    Volume112
    Publication statusPublished - 2006

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