is calculated by surface to surface radiation model. The radiation flux distributions at these surfaces (Gsolar) are
measured experimentally and shown in fig. 2. To measure the concentrated radiation distribution on the targeted
surface, the commonly used techniques of direct and indirect methods are applied. The direct method is based on the
single point flux measurement using a radiometer [12], in this study which is done with a gardon type calorimeter
(Vatell TG1000). The indirect method is based on the measurement of the flux distribution of flat lambertian target
from the image analysis of CCD camera [13-14]. In this investigation, gardon-type calorimeter measurements are
used to convert the gray-scale images of CCD camera to get the flux distribution. Thus, the radiation flux
distribution of the target surface is obtained by combining the both techniques measurements. The error bars are
obtained by the standard deviation of the measurements using the calorimeter, the maximum of 1.69% is found.
Chemical reactor is placed collinear with solar simulator optical axis and the radiation flux distribution at the target
surface is measured. This radiation flux is given as boundary condition.