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Torres Escribano, José Luis

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https://academica-e.unavarra.es/handle/2454/50087

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Torres Escribano

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José Luis

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Ingeniería

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ISC. Institute of Smart Cities

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0000-0001-9275-8158

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241

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2020 - 20212
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Subject: CIE standard sky × Author: García Ruiz, Ignacio ×

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Now showing 1 - 2 of 2
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    PublicationOpen Access
    Analytical expressions for estimating sky diffuse irradiance and illuminance on tilted planes for the CIE standard general skies
    (Elsevier, 2021) Torres Escribano, José Luis; García Ruiz, Ignacio; Ingeniaritza; Institute of Smart Cities - ISC; Ingeniería
    This work proposes a set of analytical expressions for the calculation of the relationship between sky diffuse illuminance on a tilted plane and horizontal plane corresponding to the 15 ISO/CIE standard sky types. Given the parallelism in the angular distribution of sky diffuse radiance and luminance, these expressions can also be used to calculate the diffuse sky irradiance on an inclined plane. The proposed analytical expressions are obtained by adjusting the results of a numerical calculation whose methodology is described in detail in the paper. The use of these analytical expressions significantly reduces the calculation time. It is verified that the relative root-mean-square errors obtained with the analytical expressions are small compared with the use of numerical calculation, ranging from 0.03% to 4.09%, and with a tendency to increase with clear skies and high solar zenith angles.
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    PublicationOpen Access
    The sky characterization according to the CIE Standard General Sky: comparative analysis of three classification methods
    (Elsevier, 2020) García Ruiz, Ignacio; Blas Corral, María Ángeles de; Torres Escribano, José Luis; Ingeniaritza; Institute of Smart Cities - ISC; Ingeniería
    Since the publication of the standard sky luminance distributions (SSLD) that was consolidated in the ISO 15469:2004(E)/CIE S 011/E:2003, numerous procedures have emerged for the characterization of the sky condition according to that standard. Precisely, the use of different procedures for the classification of the skies of a certain place according to the ISO/CIE standard can lead to obtain different frequencies of sky types. The existing uncertainties in the characterization of the sky condition according to the CIE Standard General Sky as a consequence of the classification procedure used are analyzed in this study. For this, three different classification procedures are used to characterize the sky radiance and luminance distribution measurements made by means of a sky-scanner in Pamplona (Spain) from 2007 to 2013. That is, (1) a method focused on determining the relative gradation and indicatrix functions, (2) a method based on the comparison of measured and standard luminances normalized against the horizontal diffuse illuminance, and (3) a new high-spatial-resolution approach that compares measured and standard luminances relative to zenith. In general terms, it is concluded that there is some uncertainty in the classification depending on the procedure used to characterize the sky.