Enhanced Cooling Process of Furnace Using Vortex Tube Cooling Device Mohd Hazwan Yusof, Muhammad Fadhli Suhaimi, Izzat Muhammad Azmi, Wan Sharuzi Wan Harun and Mohamad Firdaus Basrawi MATEC Web Conf., 225 (2018) 03012 Published online: 05 November 2018 DOI: 10.1051/matecconf/201822503012