Mohd. Qobar, Ahmad Syuhada and M. Ilham Maulana 2023. ANALYSIS OF HEAT TRANSFER CHARACTERISTICS OF TUBE BANKS ECONOMIZER USING NUMERICAL METHODS. Bulletin of Engineering Science, Technology and Industry. 1, 1 (Mar. 2023), 19–31. DOI:https://doi.org/10.59733/besti.v1i1.3.