Toward a standard testing methodology for solar thermal collectors with variable-geometry: The direct radiation incidence angle modifier issue

A quick measurement method for determining the incidence angle modifier of flat plate solar collectors using spectroradiometer

“…The solar collectors need to be run under specific incidence angle conditions over a period of time by power energy input and the test requirement is relatively rigorous in the steady-state. Particularly, determination of the IAM of solar collectors with variable geometries is more complicated because there are more than one direction of dependence for the IAM (Sallaberry et al, 2015;Hertel et al, 2015). The present study aims to introduce a quick measurement method for identifying the collector IAM using a spectroradiometer.…”