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This study includes experimental investigation on the performance of a shell and tube heat exchanger subjected to inclination angle variation. Paraffin RT35 is used as phase change material (PCM). The investigation was performed for modified Stefan numbers of 0.47, 0.53 and 0.59 and inclination angle rang from 0° to 90°. The Reynolds number is about 770 and the Grashof number is in the range of 4.6 × 10⁴–5.8 × 10⁴ which indicated that the flow is laminar. Results show that as the inlet temperature increases melting process accelerates and complete melting time reduces. Results also indicated that the rate of melting process in the first half of the process is more in the horizontal system with respect to the other inclinations. It is also revealed that the angle’s variation doesn’t affect the rate of heat transfer and the temperature during solidification which is due to the domination of conduction in this process …