PENGUJIAN KARAKTERISTIK PERPINDAHAN PANAS DAN FAKTOR GESEKAN PADA PENUKAR KALOR PIPA KONSENTRIK SALURAN ANNULAR DENGAN TWISTED TAPE INSERT WITH CENTRE WINGS

WIJAYA, INDRA (2013) PENGUJIAN KARAKTERISTIK PERPINDAHAN PANAS DAN FAKTOR GESEKAN PADA PENUKAR KALOR PIPA KONSENTRIK SALURAN ANNULAR DENGAN TWISTED TAPE INSERT WITH CENTRE WINGS. Other thesis, Universitas Sebelas Maret.

[img]
Preview
PDF (bilangan Nusselt, bilangan Reynolds, faktor gesekan, sudut serang sayap, twisted tape insert with centre wings. ) - Published Version
Download (648Kb) | Preview

    Abstract

    This research was conducted to examine the characteristics of heat transfer and friction factor in the annular channel concentric tube heat exchanger with twisted tape insert with centre wings. Flows in the inner tube and in annulus was counter flow. Working fluid in the inner tube was hot water which its inlet temperature was maintained at 60°C, whereas in the annulus was cold water at inlet temperatur of ± 27 o C. For comparison, inner tube tested without twisted tape insert (plain tube) and with classic twisted tape insert. Classic twisted tape insert and twisted tape insert with centre wings made of aluminum strip with a thickness of 0.7 mm, width 12.6 mm, which had a twist ratio of 3.8 and the pitch length of 48 mm. The attack angle of twisted tape with centre wings () was varied at 35 o , 60 o and 85 o . The research result showed that the inner tube with the addition of twisted tape insert with centre wings at the attack angle of wing,  = 85 o produced the highest Nusselt number, pressure drop, friction factor and thermal performance. At the same Reynolds number (5,500-20,500), the addition of twisted tape insert with centre wings with the attack angle of wing,  = 35 o , 60 o and 85 o into the inner tube increased the average Nusselt numbers were 19.21%, 27.80% and 47.90% compared to classic twisted tape insert, respectively. At the same pumping power, the addition of twisted tape insert with centre wings with the attack angle of wing,  = 35 o , 60 o and 85 o into the inner tube increased the average Nusselt numbers were 6.41%, 9.86% and 20.47% compared to classic twisted tape insert, respectively. At the same Reynolds number (5,500-18,500), the addition of twisted tape insert with centre wings with the attack angle of wing,  = 35 o , 60 o and 85 o into the inner tube tube has produced the average friction factor of 1.29; 1.30 and 1.53 times higher than compared to classic twisted tape insert, respectively. The addition of classic twisted tape insert and twisted tape insert with centre wings with the attack angle of wing,  = 35 o , 60 o and 85 o into the inner tube has produced the average thermal performance of 1.11; 1.18; 1.30 and 1.34, respectively Penelitian ini dilakukan untuk menguji karakteristik perpindahan panas dan faktor gesekan pada penukar kalor pipa konsentrik saluran annular dengan penambahan twisted tape insert with centre wings. Aliran di pipa dalam dan annulus adalah berlawanan arah. Fluida kerja di pipa dalam adalah air panas, dimana temperatur masukannya dipertahankan pada 60 o C, sedangkan fluida kerja di annulus adalah air dingin dengan temperatur masukannya ± 27 o C. Untuk perbandingan, pipa dalam diuji tanpa twisted tape insert (plain tube) dan dengan penambahan classic twisted tape insert. Classic twisted tape insert dan twisted tape insert with centre wings terbuat dari bahan aluminium strip dengan tebal 0,7 mm, lebar 12,6 mm dimana mempunyai twist ratio 3,8 dan panjang pitch sebesar 48 mm. Twisted tape insert with centre wings divariasi sudut serang sayap,  = 35 o , 60 o dan 85 o , dengan panjang wing (l) 7 mm dan lebar (w) wing 7 mm. Hasil penelitian menunjukkan bahwa pipa dalam dengan penambahan twisted tape insert with centre wings dengan sudut serang sayap  = 85 o menghasilkan bilangan Nusselt, penurunan tekanan, faktor gesekan dan unjuk kerja termal paling besar. Pada bilangan Reynolds yang sama (5.500-20.500), penambahan twisted tape insert with centre wings dengan sudut serang sayap,  = 35 o , 60 o dan 85 o di pipa dalam meningkatkan bilangan Nusselt rata-rata berturut-turut sebesar 19,21%, 27,80% dan 47,90% dibandingkan dengan classic twisted tape insert. Pada daya pemompaan yang sama, penambahan twisted tape insert with centre wings dengan sudut serang sayap,  = 35 o , 60 o dan 85 o di pipa dalam meningkatkan bilangan Nusselt rata-rata berturut-turut sebesar 6,41%, 9,86% dan 20,47% dibandingkan dengan classic twisted tape insert. Pada bilangan Reynolds yang sama (5.500-18.500), penambahan twisted tape insert with centre wings dengan sudut serang sayap,  = 35 o , 60 o dan 85 o di pipa dalam menghasilkan faktor gesekan rata-rata berturut-turut sebesar 1,29; 1,30 dan 1,53 kali lebih tinggi dibandingkan dengan classic twisted tape insert. Penambahan classic twisted tape insert dan twisted tape insert with centre wings dengan sudut serang sayap,  = 35 o , 60 o dan 85 o di pipa dalam menghasilkan unjuk kerja termal rata-rata berturut-turut sebesar 1,11; 1,18; 1,21 dan 1,33.

    Item Type: Thesis (Other)
    Subjects: T Technology > TS Manufactures
    Divisions: Fakultas Teknik
    Depositing User: Vignasari Kokasih
    Date Deposited: 10 May 2014 19:13
    Last Modified: 10 May 2014 19:13
    URI: https://eprints.uns.ac.id/id/eprint/15994

    Actions (login required)

    View Item