E3S Web Conf.
Volume 93, 20192018 International Conference on Green Energy and Environment Engineering (CGEEE 2018)
|Number of page(s)||4|
|Section||Environmental Engineering and Sustainable Development|
|Published online||17 April 2019|
Investigation of Sheltering Effect on Global Solar Radiation Data Measured by Weather Stations
Professor, Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan
2 Graduate Student, Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan
In instalment of pyranometers at the weather stations for measuring global solar radiation, it often cannot avoid appearance of obstacles in their surroundings. Investigation of sheltering effect on measurement of global solar radiation is performed through introducing the shelter view factor. Evaluation of the shelter view factor is made by means of a fisheye-lens photograph together with the calculation method developed by Steyn (1980). Taitung weather station (TWS) is chosen for the study. The shelter view factor for the pyranometer installed at TWS is estimated to be 11.8%. Measurements of global solar radiation are conducted at a place where is located nearby TSW but with the condition of zero shelter view factor. Comparison of the data measured at these two sites indicates 4% - 25% deviations of global solar radiation observed in different months of 2017. It suggests a need of the correction to the sheltering effect in the measuring process of global solar radiation at the weather stations except those who are not subject to surrounding obstacles in the sky dome.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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