Scattered radiation and direct radiation constitute the total amount of solar radiation received by the ground. The direct radiation is irradiated to the radiation part of the ground along the direction of the sun, and the scattering part is the radiation part formed by the reflection of sunlight through atmospheric gases, dust scattering on the ground, and elevation. Height, latitude, solar elevation angle, air quality, air humidity, ground reflectance and other parameters are relevant. In the research of solar photothermal and photovoltaic utilization, instantaneous solar scattering or direct radiation dose may be needed in some cases. But in solar energy engineering design Long-term monthly average (or daily mean) scattering or direct radiation is also often required. However, most meteorological stations usually have only total solar radiation or sunshine hours and other weather and meteorological records, and lack direct or diffuse records. Therefore, it is often necessary to calculate the scattering or direct amount based on the existing climate and meteorological data. The total radiation recorder can calculate the total solar radiation and provide a reliable basis for the production and life of agriculture.
Since the amount of scattered solar radiation is one of the most important and basic parameters in solar energy utilization, relevant researchers in various countries have all attached great importance to the research on the calculation and measurement methods of solar scattered radiation, and proposed many models. In the past 10 years, There are many researches on the two types of models. Most of the meteorological stations in China have sunshine hours records, and the establishment of a solar radiation scattering model suitable for the climatic characteristics of each place has certain practical value.
The measurement and analysis of the total radiation recorder found that for the study of the monthly average daily scattering amount or the daily average time scattering amount, various mathematical statistics methods are currently used to obtain models. In recent years, existing researchers have tried to adopt theoretical methods, theories and statistics. Methods The combined methods, neural networks, artificial intelligence and other optimization algorithms establish models, but since these methods are still in the exploration stage, there are many unreasonable places in practical application, and some models are extremely limited in scope and are no longer applied. Commentary. In summary, due to the different methods used by the researchers, the factors considered are somewhat inconsistent. Even if the same data set is used, the results obtained are somewhat different. The conditions of use may also be different.
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