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This article presents a thorough investigation of convective heat flow within a triangular enclosure containing a heated rectilinear frame. The study explores the impact of varying the size of the rectilinear frame on essential flow and heat transfer parameters, utilizing weighted residual simulations and the Finite Element Technique. Streamline patterns, pressure contours, temperature gradients, isothermal contours, local Nusselt numbers, average velocity magnitudes, and average Nusselt numbers are all examined as part of the investigation. Calculations have also been presented for different values of buoyancy parameter Rayleigh number, Ra ( ). The triangular enclosure serves as the geometric domain for the convective heat transfer phenomena. The results offer valuable insights into the thermal behavior of the system, providing a comprehensive understanding of the convective heat transfer processes. Moreover, the application of weighted residual simulations and the Finite Element technique demonstrates their efficacy in solving such heat transfer problems. The results have practical value in engineering applications, provide contributions to the field of convective heat transfer analysis and also present prospective ways to improve heat dissipation and thermal management in triangular enclosures with heated rectilinear frames.