Computing Methods in Solar Heating Design pp 22-60 | Cite as

# The Calculation of Incident Radiation

## Abstract

In the previous chapter it was seen that it is impracticable to attempt to measure solar irradiance on other than horizontal surfaces at selected locations, and in this chapter it will be shown how this measured irradiance is used in the calculation of incident irradiation on collector surfaces. Initially the extent of available data will be considered and then calculation procedures will be described using both hourly and monthly average daily data. This will be followed by procedures based on calculated extraterrestrial radiation and measured global radiation only. Recent studies to predict solar radiation from meteorological data will then be described and the chapter will be concluded with a consideration of data presentation for long-term performance predictions.

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