DESCRIPTION

r.sunyear uses the solar radiation models of r.sun with data for a whole year to calculate the optimum inclination angle (slope) for which the total annual solar irradiation is maximum, together with the irradiation on that plane.

r.sunyear and its sister modules r.pv and r.suntrack are part of the PVMAPS software package. This package consists of these GRASS modules together with scripts giving examples of how to run the modules, and, most importantly, a large amount of input data to run the modules.

In order to calculate the optimum angle for the whole year the module must read the necessary input for a whole year. For this reason, the module requires 12 monthly rasters of the Linke Turbidity, as well as the beam and diffuse coefficients.

Several of the options to r.sunyear are identical to the options given to r.sun. However, there are some new options, and some of the options work in a different way. These differences are:

NOTE

The input data requirements are almost 12 times larger than those of r.sun. It may therefore be a good idea to use the numpartitions option to read the data in chunks.

REFERENCES

See also references in the manual pages of r.sun.

AUTHORS

Thomas Huld, Joint Research Centre of the European Commission
© 2016, Thomas Huld. This program is free software under the GNU General Public License (>=v2)
thomas.huld@jrc.ec.europa.eu

Last changed: $Date: 2016-05-18 11:37:00 +0100 (Wed 18 May 2016)