ABSTRACT This study examined efficiency optimization and thermophysics characteristics of three new polygonal collectors composed of chaotic TiO2 and LiBr nanoparticles. The innovations of this study are (1) introduction of novel polygonal collectors with unconventional geometries, (2) utilization of chaotic TiO2 and LiBr nanoparticles to enhance thermophysical properties, (3) application of Response Surface Methodology (RSM) for thermal performance optimization and analysis, and (4) identification of the octagonal collector as the optimal configuration in terms of radiation absorption and heat transfer performance. The optimization process of thermal efficiency is considered using response surface methodology. So, total temperature of octagonal collector influence of TiO2 Nano particles is 63.27% and 24.32% more than the triangular and cubical collectors. Also, incident radiation of octagonal collector influence of TiO2 Nano particles is 3.56% and 4.52% more than the triangular and cubical collectors. Moreover, the surface radiation absorption of the octagonal collector influence of LiBr Nano particles is 2.93% and 4.67% more than the triangular and cubical collectors. The results show that TiO2 performs better than LiBr in terms of total thermal energy. For enthalpy, the maximum value at y = 0.028 m is 19,013.523 J/kg (22%) in the triangular collector, while the minimum is 2677.9698 J/kg (3%) in the octagonal collector, both for TiO2. The total ground heat flux of the octagonal collector influence of LiBr Nano particles is 74.26% and 74.63% more than the triangular and cubical collectors.
Baharloui et al. (Sun,) studied this question.