The study aims to conduct a practical and theoretical study of heat transmission by free pregnancy. The finy and non-fin cylinders and each type includes three cylinders arranged in the form of vertical rows and installed between two plates, the first of which is the fin cylinders with spiral fins and made of solid iron, and the second non-fin cylinders made of copper, where The practical results of the fin cylinders showed that the maximum value of the number of asphalt cylinders at angle 30 at low heat flood levels of 278.8,121.16 W/M2, but at high heat flood levels of 792.5,497.90 w/m2, the best angle gives the maximum value of the number of breeds is 60. The practical results of the non-fin cylinders also showed that the maximum value of the number of breeds at angle 30 at low thermal flood levels is 445.45/181.8 W/M2 but at high heat flood levels of 1318.18,18 The results of the message showed that the effect of the tilt angle on the heat transmission of the fin cylinders is greater than that of non-fin cylinders, and the results showed that the heat transmission factor improves the upper cylinders for the lower cylinders by 57.77%/10.92% for fin cylinders and 57.6% / 10.74% for smooth cylinders, the theoretical study was conducted using an ANSYS FLUENT18.0 program to simulate the practical and theoretical results of both types of cylinders and showed a good convergence with a small difference rate of not more than 9.6%, 8.24% for the paired cylinders