The Effect of the use of Silica Sand Before and After Physical Activation on Acceleration of 4-Step Gasoline Motorcycle Engine

This research was conducted with the aim of knowing the Effect of using silica sand before and after physical activation on the acceleration of a 4-stroke gasoline motorcycle engine. This research was conducted by testing the acceleration 0 – 80 km/hour and 40 – 80 km/hour with variations in the composition of tapioca in the pellet mixture (1%, 2%, and 3%) and variations in temperature activation (150?C, 200?). C, and 250?C). The silica sand pellets used in this study were 10 mm in diameter with a thickness of 3 mm, which had been activated for 60 minutes. The results showed that the use of silica sand had an effect on the acceleration of a 4-stroke gasoline motorcycle. The best composition of silica sand pellets occurs in the amount of tapioca 3% and with an activation temperature of 250?C, which can increase the acceleration by 12.45% at an acceleration of 0 – 80 km/hour

Experimental study of the thermal properties of waste cooking oil applied as thermal energy storage

Waste cooking oil is a residue containing 40%–60% cooking oil that has been used several times. It has a great potential that has not been widely explored considering the fact that residual oil is usually wasted in the drainage and soil with subsequent negative effects on the ecosystem. Cooking oils have potential to application in cooling rooms and this is the reason it is necessary to determine its thermal properties. Several tests were conducted in this study on the waste cooking oil and these include PCM compound composition determination using Agilent brand of Gas Chromatography (GC) type 7890 b, T-History, Differential Scanning Calorimetry (DSC) using DSC type 214 Polyma Brand NETZCSH, and thermal conductivity through the TCi Thermal Conductivity Analyzer Brand C-Therm. Some changes were observed in the type and composition of fatty acid compounds of cooking oil during the frying process such as the increase in the methyl arachidate from 10.71% to 45.68% in waste coconut cooking oil (WCCO). The WCCO is also very interesting to be developed as thermal energy storages considering the similarities it has with CCO such as the 97.7 kJ/kg latent heat for melting and 0.155 W/m.K thermal conductivity