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Diffuse Ultraviolet Erythemal Irradiance on Inclined Planes: A Comparison of Experimental and Modeled Data |
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| Authors: | María P Utrillas María J Marín Anna R Esteve Victor Estellés Fernando Tena Javier Cañada José A Martínez-Lozano |
| Institution: | Solar Radiation Group, Departament de Física de la Tierra i Termodinámica, Universitat de València, Valencia, Spain; Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), Valencia, Spain; Solar Radiation Group, Departamento de Termodinámica Aplicada, Universidad Politécnica de Valencia, Valencia, Spain |
| Abstract: | Values of measured and modeled diffuse UV erythemal irradiance (UVER) for all sky conditions are compared on planes inclined at 40° and oriented north, south, east and west. The models used for simulating diffuse UVER are of the geometric-type, mainly the Isotropic, Klucher, Hay, Muneer, Reindl and Schauberger models. To analyze the precision of the models, some statistical estimators were used such as root mean square deviation, mean absolute deviation and mean bias deviation. It was seen that all the analyzed models reproduce adequately the diffuse UVER on the south-facing plane, with greater discrepancies for the other inclined planes. When the models are applied to cloud-free conditions, the errors obtained are higher because the anisotropy of the sky dome acquires more importance and the models do not provide the estimation of diffuse UVER accurately. |
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