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Abstract: With the help of ETHE we can reduce the energy consumption required for space. However, for determining the surface heat convection, due to lack of available methods it is difficult to make accurate energy simulation and design. Research of ETHE was carried out at beginning as a field investigation. But now CFD simulation is used for accurate heat transfer. In use of complex dimensioning process required such a system, which involves optimization of numerous parameters such as the diameter, air flow rate depth, tube length and condensation in the meantime have to be considered. For the CFD simulation analysis the pipe of 30 m length, 0.003m thickness and 0.15 m diameter, The temperature value considered for inlet is days in month of December from 01 December to 30 December 2022 at hourly according the climate of Bhopal, M.P. has been taken to observed for the outlet blow with different velocities. Using the CFD analysis it is observed at low air velocity that rate of heat transfer and performance increases in winter.