CFD-Based Energy and Thermal Performance Evaluation of a Coconut Shell-Fired Downdraft Kiln for Sustainable Brick ProductionGerelizza T. Angga, Michael E. Loretero and Liregine S. CaymeE3S Web Conf., 712 (2026) 03005DOI: https://doi.org/10.1051/e3sconf/202671203005