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

Abstract

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