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This preprint presents a novel solar thermal energy system that integrates a dual parabolic reflector configuration with a 50-slit diffraction grating to enhance optical concentration and thermal efficiency. Designed for global sustainability, the system leverages 80% recycled materials, including aluminum foil and scrap copper, to reduce costs and environmental impact. Theoretical analysis, supported by proposed ray-tracing simulations, demonstrates a power density of 0.204 kW/m² and a system efficiency of 20.36%, outperforming conventional photovoltaic (PV) systems (18% efficiency, 0.18 kW/m²). The paper includes detailed calculations of concentration ratios, diffraction behavior, thermal conversion, and material cost-benefit analysis. Sensitivity analysis shows optimal performance at 50 slits, with diminishing returns beyond. The study concludes with a discussion of limitations and a roadmap for experimental validation, scalability, and deployment in low-cost, high-impact renewable energy applications.This preprint is also indexed via OpenAIRE and Google Scholar. Please cite using the DOI provided by Zenodo.