Appendix 1


In this book, all the symbols used are explained the first time they are used. This appendix includes a general list that could be consulted in case of doubt. It should be noted, however, that only the general or most used symbols are included in the following list and not variations, usually denoted with subscripts. The appendix initially presents the nomenclature used with respect to radiation and then the general list of symbols. Finally, a list of abbreviations is given.

Radiation nomenclature

G Irradiance (W/m2)

H Irradiation for a day (J/m2)

I Irradiation for an hour (J/m2)

R Radiation tilt factor


B Beam

D Diffuse

G Ground reflected

n Normal

t Radiation on tilted plane

c Critical


A Aperture area ...

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