研究目的
To develop an equation to describe the daily variation law of solar radiation flux density incident on the horizontal surface and estimate the total solar energy.
研究成果
The daily variation law of solar radiation flux density incident on the horizontal surface can be described by a normal distribution model. The total solar energy per square centimeter can be estimated by the developed equation. The model can almost completely explain the daily change of temperature, humidity, the rate of plant photosynthesis, transpiration, and evapotranspiration.
研究不足
The sky conditions vary with time in a day due to atmospheric motion, and do not completely satisfy the stable sky conditions. Therefore, the value of R always approaches to 1.0, but it does not equal 1.0.
1：Experimental Design and Method Selection:
The study used a Gaussian curve to simulate the dynamic changes of hourly instantaneous solar irradiances flux density over time.
2：Sample Selection and Data Sources:
Daily solar radiation data was measured at Changwu Experimental Station under the China Academy of Sciences and Ministry of water Resources.
3：List of Experimental Equipment and Materials:
The data was measured with high-precision equipment and collected in 2005-
4：Experimental Procedures and Operational Workflow:
20 Instantaneous solar irradiances flux density was automatically recorded once an hour from 0:00 to 24:
5：Data Analysis Methods:
The relationship between solar radiation flux density and time was analyzed using a normal distribution model.
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