The current study investigated the effect of collector aspect ratio on the thermal performance of a louvered finned solar air heater (LFSAH) using nanoparticles. Analyses are performed on various collector aspect ratios and mass flow rates (MFR) to determine their impact on heat transfer and overall system performance. The findings reveal that changing the collector aspect ratio has significant effects on the thermal efficiency and heat transfer properties of a solar air heater (SAH). It has been observed that increasing the aspect ratio increases heat transmission and improves the thermal efficiency of the system. When an aspect ratio of 4:1 was used, LFSAH and PSAH attained the highest thermal efficiency, with percentages of 81.63% and 68.13%, respectively. The study’s findings provide useful information for improving the design and operation of LFSAH while keeping the aspect ratio as a critical variable in consideration. In the context of solar air heaters, optimizing the aspect ratio offers substantial benefits. By enhancing energy efficiency, it reduces reliance on fossil fuels and effectively minimizes air pollution. Additionally, this optimization contributes to water conservation and mitigates the risk of groundwater and surface water pollution. Furthermore, promoting energy-efficient heating systems helps mitigate soil contamination risks. Hence, the study underscores the importance of considering the aspect ratio in the design of louvered finned solar air heaters, providing valuable insights for the development of sustainable heating systems that foster a cleaner environment.

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