HandBook solar engineering

This document provides an overview of the theoretical basis and methodology used in the METEONORM software. It discusses how hourly radiation values are referenced, and how meteorological data like radiation, temperature, wind, and rain are interpolated worldwide using inverse distance weighting models. Correction factors are also applied for different terrain features and locations near lakes, cities, valleys, and coastal areas. The interpolation process achieves a root mean square error of around 15 W/m2 for monthly global radiation averages and 1.9°C for monthly temperature averages.