Electronic Theses and Dissertation

Compact heat exchanger tipe tube merupakan salah satu heat exchanger yang paling umum digunakan di industri. Untuk meningkatkan performa heat exchanger telah banyak dilakukan penelitian, salah satunya yaitu dengan penambahan sirip pada permukaan luar. Tujuan dari penelitian ini adalah mengkaji pengaruh konfigurasi jarak sirip terhadap laju perpindahan panas dan koefisien perpindahan panas konveksi pada compact heat exchanger tipe tube berbelokan tajam dengan panjang laluan 300 mm, panjang belokan 82 mm, dan panjang total heat exchanger 6 meter. Diameter dalam tube (Di) 20 mm dan diameter luar tube (Do) 22 mm. Jenis sirip yang digunakan yaitu sirip circular dengan ketebalan 0,3 mm, tinggi sirip 10 mm, jarak antar sirip circular 30 mm, serta potongan sirip divariasikan 3 mm, 5 mm, dan 7 mm. Air dengan temperatur divariaskian 80 ⁰C dan 70⁰C dialirkan kedalam tube, perpindahan panas konveksi terjadi ketika udara melintasi heat exchanger (dengan kecepatan yang divariasikan yaitu 2,2 m/s, 2,8 m/s dan 3,3 m/s). Hasil penelitian menunjukkan pengaruh potongan sirip dapat meningkatkan laju perpindahan panas konveksi dan potongan sirip 7 mm merupakan nilai terbaik dengan rata-rata peningkatan 44,6% pada temperature 80⁰C dan 31,1% pada temperature 70⁰C serta koefisien perpindahan panas konveksi rata-rata juga meningkat dengan peningkatan 43,6% pada temperature 80⁰C dan 29,6% pada temperature 70⁰C dibandingkan dengan heat exchanger tanpa sirip

The tube-type compact heat exchanger is one of the most commonly used heat exchangers in the industry. To improve the performance of heat exchangers, many studies have been carried out, one of which is by adding fins to the outer surface. The purpose of this study was to examine the effect of fin spacing configuration on the heat transfer rate and convection heat transfer coefficient in a sharply curved tube-type compact heat exchanger with a path length of 300 mm, a bend length of 82 mm, and a total heat exchanger length of 6 meters. The inner diameter of the tube (Di) is 20 mm and the outer diameter of the tube (Do) is 22 mm. The types of fins used are circular fins with a thickness of 0.3 mm, fin height of 10 mm, distance between circular fins of 30 mm, and fin cuts varied by 3 mm, 5 mm and 7 mm. Water with various temperatures of 80 ⁰C and 70⁰C is flowed into the tube, convection heat transfer occurs when air passes through the heat exchanger (with varied speeds of 2.2 m/s, 2.8 m/s and 3.3 m/s). The results showed that the effect of fin cutting can increase the convection heat transfer rate and 7 mm fin cutting is the best value with an average increase of 44.6% at a temperature of 80⁰C and 31.1% at a temperature of 70⁰C and the average convection heat transfer coefficient also increases. with an increase of 43.6% at 80⁰C and 29.6% at 70⁰C compared to a heat exchanger without fins