Assessment of predicted versus measured thermal comfort and optimal comfort ranges in the outdoor environment in the temperate climate of Glasgow, UK

Annika Oertel, Rohinton Emmanuel, Patricia Drach

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    Abstract

    In a warming world the risk of overheating is significant in temperate climate areas such as Glasgow, UK where adaptation to overheating is low. An easy-to-use thermal comfort evaluation is therefore a necessary first step towards developing effective coping mechanisms. In this study we explore the effectiveness of Predicted Mean Vote (PMV), Predicted Percentage of Dissatisfied (PPD) and Physiologically Equivalent Temperature (PET), together with air temperature in mimicking actual thermal sensation votes of street users obtained in 2011 in Glasgow City Centre. The PMV/PPD indices developed for controlled indoors show a surprising similarity to actual thermal sensation votes derived from outdoor surveys, than the PET developed specifically for the outdoors. The method of calculation of mean radiant temperature (Tmrt) is key to improved performance of PET, with fish-eye lens photographs improving its performance. The results also show air temperature (Ta) alone has nearly equal predictive power of the actual thermal sensation. A preliminary comfort range for Glasgow is also derived and its limitations are explored.
    Original languageEnglish
    Pages (from-to)482-499
    Number of pages18
    JournalBuilding Services Engineering Research and Technology
    Volume36
    Issue number4
    Early online date18 Dec 2014
    DOIs
    Publication statusPublished - Jul 2015

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    Thermal comfort
    Temperature
    Air
    Lenses
    Hot Temperature

    Keywords

    • environmental comfort
    • comfort ranges
    • thermal comfort
    • PMV
    • PET

    Cite this

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    abstract = "In a warming world the risk of overheating is significant in temperate climate areas such as Glasgow, UK where adaptation to overheating is low. An easy-to-use thermal comfort evaluation is therefore a necessary first step towards developing effective coping mechanisms. In this study we explore the effectiveness of Predicted Mean Vote (PMV), Predicted Percentage of Dissatisfied (PPD) and Physiologically Equivalent Temperature (PET), together with air temperature in mimicking actual thermal sensation votes of street users obtained in 2011 in Glasgow City Centre. The PMV/PPD indices developed for controlled indoors show a surprising similarity to actual thermal sensation votes derived from outdoor surveys, than the PET developed specifically for the outdoors. The method of calculation of mean radiant temperature (Tmrt) is key to improved performance of PET, with fish-eye lens photographs improving its performance. The results also show air temperature (Ta) alone has nearly equal predictive power of the actual thermal sensation. A preliminary comfort range for Glasgow is also derived and its limitations are explored.",
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