V. Marinelli

Data bank Experimental data of the Linke Turbidity factor and estimates of the Ångström turbidity coefficient for two Italian localities

Experimental data of the Linke turbidity factor and estimations of the dngstrom turbidity coefficient are presented. This data has been obtained starting from beam solar radiation measurements performed at Arcavacata di Rende (Cosenza) and at Casaccia (Rome). Comparisons have also been carried out with some calculation methods.

A calculation method for the estimation of the Linke turbidity factor

A general calculation model is presented to determine the Linke turbidity factor, starting from the experimental datum of global daily solar radiation on the horizontal plane. The model was validated using experimental data for the turbidity factor obtained at Arcavacata di Rende (Cosenza) and at Casaccia (Rome). Moreover, polynomial relations are presented for quick calculation of this parameter on different days of the year for those localities for which the European Solar Radiation Atlas supplies the maximum solar radiation values on clear days.

Estimating effective solar absorptance in rooms

Abstract A model capable of calculating the redistribution of solar energy inside a buildings rooms and the rooms effective solar absorptance was developed and implemented in a computer code. Best-fit curves of a rooms effective solar absorptance are provided as a function of the ratio between the window area and the internal surface area and of the wall absorptance. Moreover, model predictions are compared with an approximate theoretical equation.

General calculation methods for solar trajectories

Two calculation methods for solar trajectories are considered, being of general validity and applicable to all latitudes. In addition, some polar and Cartesian solar trajectory diagrams are presented.