Applying magnetic fields to improve the arrangement of hydrocarbon molecules in fuel lines have been continuously studied in recent decades. However, scientific reports regarding the application of a magnetic field integrated with a gasoline vaporizer tube (GVT) on engine performance have not been widely discussed. Therefore, this article presents an investigation of the application of GVT with magnetic field on a single cylinder gasoline engine with three different fuel qualities, including RON88, RON92, and RON98. Torque, power, emissions and fuel consumption have been tested for scientific opinion. The results of our present investigation seem to confirm the claims of GVT inventors, where GVT increases engine torque and power, reduces CO and HC content in exhaust gases, and reduces fuel consumption. However, without considering the supply of gasoline and air from the GVT to the engine is an unfair analysis. In fact, although the established theories reveal the benefits of applying a magnetic field to the fuel line, in this case, only a small part of the fuel is induced by the magnetic field, outside the main line from the tank to the injectors. Finally, the results of this investigation provide new insights for potential users of GVT, which is currently commercially available.
Solar power is considered as the most essential renewable energy in human life, particularly for daily activities. The application of solar water heater is significantly able to reduce the electric load of water heating so that this method is indirectly able to save energy needs. The biggest challenge is increasing the energy density of warm water storage. The best storage medium is paraffin, but it is constrained by the low thermal conductivity of the paraffin and also the wrapping media. This study focuses on efforts to improve thermal conductivity of paraffin as a heat storage medium by using nickel mixture at a ratio (volume) of 10 - 50%. Samples of paraffin and nickel paraffin mixture are inserted into the wrapper of aluminum 6063 material and then tested for heat absorption and release process. The best heat absorption is shown by the sample with the most nickel content, while in the heat release process the best performing sample is shown with a nickel mixture between 20–40%. These results are directly related to the power rate of each sample. The results of this study can be used as a reference for increasing the thermal capacity of warm water storage from solar water heaters.
Pengecatan adalah salah satu upaya untuk menjaga penampilan bodi kendaraan, dikarenakan pengecatan memiliki fungsi untuk melindungi material dari terjadinya karat. Oleh sebab itu, dilakukan penelitian terkait sintesis cat epoxy dengan variasi suhu pengeringan agar diperoleh komposisi yang tepat untuk mendapatkan karakteristik yang baik. Penelitian yang sudah banyak dilakukan hanya berfokus pada temperatur oven pengeringan saja, namun pada penelitian ini waktu pengeringan oven menjadi salah satu hal yang juga diperhatikan. Hasil penelitian yang didapatkan pada penelitian ini adalah semakin tinggi temperatur pengeringan dengan waktu pengeringan yang sama dapat menurunkan nilai penampilan dan kemampuan daya kilap serta ketebalan lapisan cat. Berlawanan dengan hal tersebut, ternyata tingginya suhu pengeringan tidak memiliki pengaruh terhadap kemampuan daya lekat cat apabila dilakukan waktu pemanggangan yang sama, yaitu 20 menit.
This study aims to determine the effect of alkali concentration on the thermal properties of HDPE composites with water hyacinth and carbon nanotubes (CNTs). The method used in this study is the experimental method. Composites made of natural fiber filler, the alkali treated water hyacinth. The water hyacinth was also filled was treated in alkali solution at various concentration (0%, 2%, 4%, 6%, and 8%). In addition to using water hyacinth fiber, the carbon nanotube (CNT) in a matrix of high-density polyethylene (HDPE). The composites were made using Rheomix OS machine. Furthermore, thermal testing of composite specimens using machine Thermogravimetric Analysis (TGA) were conducted. The results obtained from testing the thermal properties is the thermal resistance value. Thermal resistance of composites with alkali treatment of 0%, 2%, 4%, 6%, and 8% were 258,9 0C, 259,5 0C, 260,3 0C, 264,0 0C, and 265,9 0C, respectly. Based on these results it can be concluded that the concentration of NaOH improves the thermal resistance of the composite.
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