Analisis Pengaruh Penggunaan Fin terhadap Peningkatan Perpindahan Kalor pada Alat Penukar Kalor untuk Menyimpan Kalor Laten.

ABSTRAK The fin effect on heat transfer rate of a heat exchanger for latent thermal energy storage system using the latent heat of fusion of a phase change material (PCM) has been studied. The heat storage container consists of a double pipe heat exchanger , where the energy source (hot water) flows through the copper inner finned tube of 12,5 mm inside diameter with 1,75 mm thick and 1495 mm length, while the heat sink (storage PCM) fills the annulus gap (outer pipe consists of PVC of 78 mm inside diameter with thickness of 6 mm). The PCM used in the experiments is paraffin wax of melting temperature 44 C. Heat transfer rate and accumulated energy stored into PCM as a function of time were determined for different water flow rates and water inlet temperatures. The experimental results have been compared to the one obtained by the plain tube heat exchanger. The results show that substituting a series of fin on the surface of inner tube of heat exchanger significantly increases the heat transfer rate and accumulated energy in the system. Key word: transfer kalor, parafin wax, PC