This paper presents characterization of a new high flux solar simulator consisting of a 10 kW Xenon arc via indirect heat flux mapping technique for solar thermochemical applications. The method incorporates the use of a heat flux gauge (HFG), single Lambertian target, complementary metal oxide semiconductor (CMOS) camera, and three-axis optical alignment assembly. The grayscale values are correlated to heat flux values for faster optimization and characterization of the radiation source. Unlike previous work in heat flux characterization that rely on two Lambertian targets, this study implements the use of a single target to eliminate possible errors due to interchanging the targets. The current supplied to the simulator was varied within the range of 120–200 A to change the total power and to mimic the fluctuation in sun’s irradiance. Several characteristic parameters of the simulator were studied, including the temporal instability and radial nonuniformity (RNU). In addition, a sensitivity analysis was performed on the number of images captured, which showed a threshold value of at least 30 images for essentially accurate results. The results showed that the flux distribution obtained on a 10 10 cm 2 target had a peak flux of 6990 kWm 2 , total power of 3.49 kW, and half width of 6.25 mm. The study concludes with the illustration and use of a new technique, the merging method, that allows characterization of heat flux distributions on larger areas, which is a promising addition to the present heat flux characterization techniques.
|Original language||English (US)|
|Journal||Journal of Solar Energy Engineering, Transactions of the ASME|
|State||Published - Apr 2019|
Bibliographical noteFunding Information:
This research has been funded by University of Minnesota Duluth. Authors appreciate Dr. Matthew Lindemer’s contribution in conducting some portion of the literature survey. The corresponding author appreciates the diligent effort and support of Professor Aydin Durgunoglu, Professor Rudy Perrault, Ms. Kathleen Adee, and Mr. Michael Swanson in materialization of High Flux Gas Dynamics Laboratory.
Copyright © 2019 by ASME.
Copyright 2019 Elsevier B.V., All rights reserved.