Pengaruh Kecepatan Fluida Pendingin (Udara) Terhadap Unjuk Kerja Dan Karakteristik Perpindahan Panas Pada Radiator Sepeda Motor Yamaha Nmax 155CC


  • Ridho Syahrul a:1:{s:5:"en_US";s:8:"Children";}


The cooling system is the main part in an engine that functions to maintain the condition of the engine so that it remains at working temperature, which is 80℃-90℃. To maintain these conditions requires optimal work of the cooling system. One of the most important components of the cooling system is the radiator. This study uses the ε-NTU method to analyze the data. The tool used in this research is a 155cc Yamaha Nmax motorcycle radiator with vertical flow type, flat tube and louvered fins, fan as a simulated wind source. The coolant mixture used is 50% water + 50% radiator coolant while the air flow rate is constant at 4 lpm and the hot fluid temperature is set at a constant 80℃. The variation of air flow velocity used in this test is 4-8 m/s with an increase of 1 m/s to adjust the speed of air flow used by the Dimmer as a tool. From the tests that have been carried out, the largest air flow rate occurs at a fan speed of 8 m/s. The greatest heat transfer rate occurs at a fan speed of 8 m/s of 0.0735 KW and overall heat also occurs at a fan speed of 8 m/s which is 9.50 W/m2°C. Maximum radiator efficiency occurs at a fan speed of 5 m/s with a value of 7,59   Keywords : Effectivenes, ɛ-NTU Method, Nmax 155cc Radiator