Daylighting performance of tubular solar light pipes: measurement, modelling and validation.

Zhang, Xiaodong (2002) Daylighting performance of tubular solar light pipes: measurement, modelling and validation. PhD thesis, Edinburgh Napier University.

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    The innovation of natural daylighting light pipe took place more than twenty years ago. Since then its
    daylighting performance has been reported in a number of studies. To date, however, no mathematical
    method that includes the effect of straight-run and bends within light pipes has been made available.
    Therefore, a generalm athematicalm odel for light pipes is desirablet o assessa nd predict its daylighting
    performance.F urthermore,s uch a generalm odel can enablet he assessmenot f light pipe system's
    efficiency and potential in energy saving.
    A modified form of daylight factor, Daylight Penetration Factor (DPF), has been introduced to build a
    sophisticated model that takes account of the effect of both internal and external environmental factors,
    and light pipe configuration. Measurementsa nd mathematicalm odelling activities aimed at predicting
    the daylighting performance of light pipes with various configurations under all weather conditions in
    the UK were undertaken. A general daylighting performance model, namely DPF model, for light pipes
    was developed and validated. The model enables estimation of daylight provision of the light pipes
    with a high degree of accuracy, i. e. R2 values of 0.95 and 0.97 for regression between predicted and
    measured illuminance were respectively obtained for the above model.
    The DPF model uses the most routinely measured radiation data, i. e. the global illuminance as input.
    Considering that in real applications, light pipes installed in a particular building may not receive the
    full amount of global illuminance as measured by local meteorological office. This may be due to
    partial shading of the light pipe top collector dome. Therefore, to enable the application of the DPF
    model in practical exercisesf undamentalw ork on sky diffuse illuminance measurementsh ave been
    An exhaustive validation has been carried out to examine the DPF model in terms of the structure of
    the model and its performance. The DPF model was compared against studies by other independent
    researchersin the field. Independentd ata setsg atheredf rom a separates ite were used to validate the
    performance of the DPF model. Comprehensive statistical methods have been applied during the course
    of validation. Relevant, brief economic and environmental impact of the technology under discussion
    has also been undertaken.
    One of the main achievementso f this work is the mathematicalm ethod developedt o evaluatet he
    daylighting performance of light pipes. T'he other main achievement of this work is the development
    and validation of the DPF models for predicting light pipes' daylighting performance.

    Item Type: Thesis (PhD)
    Uncontrolled Keywords: Daylight penetration factor; solar energy; environmental engineering; environment protection; applied mathematics;
    University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
    Dewey Decimal Subjects: 600 Technology > 620 Engineering > 621 Electronic & mechanical engineering > 621.3 Electrical & electronic engineering > 621.32 Lighting
    600 Technology > 690 Building & construction > 690 Buildings > 690.1 Structural elements
    Library of Congress Subjects: T Technology > TH Building construction
    Item ID: 3602
    Depositing User: Mrs Lyn Gibson
    Date Deposited: 05 Feb 2010 15:15
    Last Modified: 12 Jan 2011 04:54

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