Numerical Study on Improving the Efficiency of the Earth Pipe Cooling System Parnab Saha, Musanna Galib, Md. Mahdi-Ul-Ishtiaque, Shamimur Rahman Akanda and Mohammed Abdul Hannan E3S Web Conf., 65 (2018) 05018 Published online: 26 November 2018 DOI: 10.1051/e3sconf/20186505018