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有读书笔记有附件A New Shadow-Ring Device for Measuring Diffuse Solar Radiation at the Surface

罗瑞龙 添加于 2012-5-22 05:12 | 1744 次阅读 | 0 个评论
  •  作 者

    Amauri P. de Oliveira, Antonio J. Machado, João F. Escobedo
  •  摘 要

    A new shadow-ring device for measuring diffuse solar radiation at the surface is presented. In this device the seasonal variation of shadow is followed by moving the detector horizontally. This unique characteristic facilitates its application for long and continuous periods of time. The blocking effect caused by the ring and other related geometric properties are formulated considering the diffuse solar radiation isotropic. The correction factor, shadow size, and ring-detector distance are derived as a function of radius and width of the ring, sun position, and local latitude. The largest blocking occurs during summer, when the ring-detector distance and the shadow width are the smallest, and it is compensated by a smaller blocking effect in the winter period. The performance of the new device is verified comparing daily values of diffuse solar radiation measured simultaneously with a similar device from Kipp & Zonen, Inc. The results show a very good agreement (within 2.5%) between both devices. The new device was also able to reproduce the radiometric properties of the local atmosphere based on 3-yrlong measurements of direct solar radiation using a pyrheliometer. The new device can be applied to estimate daily values of diffuse solar radiation at the surface in the range of 308N–308S with results comparable to other similar apparatuses.
  •  详细资料

    • 文献种类: Journal Article
    • 期刊名称: Journal of Atmospheric and Oceanic Technology
    • 期刊缩写: J. Atmos. Oceanic Technol.
    • 期卷页: 2002  19 5 698-708
  • 学科领域 工程技术 » 机械工程

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    1. The diffuse component of the solar radiation over a horizontal surface can be estimated by blocking the direct component of solar radiation.
    2. the field of diffuse solar radiation is seldom isotropic.
    3. horizontal variation of surface albedo (漫反射系数、反照率) and uneven distribution of clouds are the more important sources of anisotropy (各向异性).
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