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| Analysis of measurement error caused by improper installation of photoelectric digital sunshine recorder |
| Zhao Zhendong |
| Hebei Information Engineering School,Baoding 071000 |
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Abstract Based on the principle of measuring sunshine duration by photoelectric digital sunshine recorder,the error of solar direct irradiation caused by un-horizontal installation,and misaligned of south-north line and latitude is analyzed in this paper.The direct irradiance ≥120 W/m-2 is used as the criterion for sunshine duration.Therefore,the error caused by improper installation affects the calculation of sunshine duration only when the direct irradiance is close to 120 W/m-2.
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Received: 13 November 2019
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2021, Vol. 38 
