Developing a surrogate RC Model for Optimal HVAC Control Applications in Modelica-Based Building Digital TwinJincheng Dai, Ryozo Ooka, Chao Lin, Shintaro Ikeda and Ken TakahashiE3S Web Conf., 716 (2026) 02015DOI: https://doi.org/10.1051/e3sconf/202671602015