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Parabolic trough collector (PTC) is prospective for energy storage compatibility and its thermal performance is limited by weather dependence. It is important to decide the performance of the parabolic trough collector. In this study, the snail shell porous biological material acts as energy storage material integrated with the receiver. These porous materials could store heat and supplies to enhance thermal performance by supplying heat energy to a working fluid during reduced radiation availability. Hence, the experimentation is conducted under two dissimilar flow rate conditions, such as 150 and 300LPH, with and without the porous material receiver. The findings of this research demonstrate that receivers with porous material show superior thermal performance compared to those without porous material. The peak average outlet water's temperature, heat absorption, heat transfer coefficient (HTC), and thermal and exergy efficiency are about 68.7°C, 5312.3W, 357.9W/m2K, 70.6%, and 49.5%, respectively, at 150LPH. However, the efforts of porous material featured parabolic trough collector receiver found optimum thermal performance rather than conventional parabolic trough collector and previous work of parabolic trough collector configured with nanofluid.

The growing interest in alternative fuels stems from the need to address energy security and economic challenges. Hydrogen fuel is considered a promising solution due to its versatility, efficiency, and potential for zero emissions, as well as continuous technological advancements and increasing policy support. This study intends to enhance Chlorophyta growth by incorporating different volume percentages of cerium oxide (CeO2) as feedstock for hydrogen production through hydrothermal gasification. The research findings indicate that the highest concentration (0.2 vol %) of CeO2 resulted in the maximum growth of 0.63 μ/day, which was utilized for hydrogen extraction. Additionally, the investigation explored the impact of Chlorophyta algae loading (0.05-0.15 g/mL) and processing temperature (500-650°C) on molar fraction, hydrogen yield, gasification efficiency, carbon efficiency, and total hydrogen production. Higher feedstock (0.15 g/mL) and gasification temperature (650°C) were found to improve hydrogen fraction (61.8%), yield (10.2 mol/kg), gasification efficiency (43.8 %), and total hydrogen production (62.5%).