Development of synthetic hemispheric projections suitable for assessing the sky view factor on vertical planes.pdfVIP

Development of synthetic hemispheric projections suitable for assessing the sky view factor on vertical planes.pdf

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Development of synthetic hemispheric projections suitable for assessing the sky view factor on vertical planes.pdf

Renewable Energy 74 (2015) 279e286 Contents lists available at ScienceDirect Renewable Energy journal homepage: /locate/renene Development of synthetic hemispheric projections suitable for assessing the sky view factor on vertical planes J. Ramírez-Faz*, R. Lopez-Luque, F.J. Casares Research Group of Physics for Renewable Energies and Resources, University of Cordoba, Edi?cio Albert Einstein, Campus de Rabanales, 14071 Cordoba, Spain article info Article history: Received 16 April 2014 Accepted 9 August 2014 Available online 27 August 2014 Keywords: Sky view factor Hemispherical projection Daylight abstract The solar radiation balance in buildings has a signi?cant impact on their energy needs, as well as on their potential BIPV energy production. It also in?uences the potentials of daylight, its healthiness and sustainability. Solar radiation models for urban environments require the characterization of the obstruction degree to which each point is subjected due to other buildings, topography, vegetation, etc. This characterization is carried out with the parameter known as sky view factor (SVF). In this paper, we deepen and extend the study of SVF on vertical surfaces that have a high level of obstruction. This paper aims to present a general mathematical method to obtain projection equations in vertical planes, which allow the study of SVF as a surface ratio. It is also proposed an adequate projection for vertical planes under the hypothesis of angular distribution of diffuse radiance based on Moon-Spencer’s model. ? 2014 Elsevier Ltd. All rights reserved. 1. Introduction Incident solar radiation in buildings determines the energetic balance and healthiness of rooms. It also supports heating systems in cold seasons and acts as a natural light source. Excess insolation, however, may have a negative impact due to two main reasons, namely: (i) solar radiation can be a heating load that needs to be balanced with air conditioning; and (ii) it may cause glaring and,

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