Tujuan penelitian untuk mendisain mesin pencacah gelas plastik dengan penggerak manual, serta mengujikinerjanya. Penelitian ini menggunakan metode VDI 2221 yaitu metode untuk menyelesaikan permasalahandan mengoptimalkan penggunaan material, teknologi dan keadaan ekonomi. Metode ini diharapkan dapatmempermudah perancang untuk menguasai sistem perancangan tanpa harus menguasai secara detail.Kesimpulan dari penelitian ini adalah peneliti berhasil merancang mesin pencacah gelas plastik dengan bentukyang optimal dan minimalis, kecepatan pemotongan ( 0,012 m/s ) dan pemipihan ( 0,01 m/s ). Diameter porosditentukan oleh tegangan geser pemipih ( 5,09 Kg/mm2 ) dan tegangan geser pisau ( 18,8 Kg/mm2 ) sehinggadidapatkan hasil 12 mm. Daya yang dibutuhkan pada mesin ini sebesar 0,05 kW dan transmisi yang digunakanpada mesin ini yaitu penggunaan roda gigi yang dihubungkan rantai. Hasil pengujian mesin pemotong gelasplastik dapat memotong 0,864 kg dalam waktu 1 jam dengan kebisingan maksimum hanya 70,3 db, dimanahasil ukuran cacahan atau serpihan berkisar ukuran 4 mm x 4 mm, ukuran tersebut yang dapat dijual diperusahaan daur ulang plastik.
This paper presents a simulation of the potential cooling effect that can be harvested from the Liquefied Petroleum Gas (LPG) phase change process on the fuel line before being supplied to the combustion chamber. The composition of LPG used was obtained from the average test result of the samples taken periodically in the fuel line with a special gas syringe which were then injected into Gas Chromatography-Mass Spectrometry (GC-MS). Effect of fluctuations of LPG composition was also analysed on the energy delivery to the combustion chamber. Furthermore, simulation results showed that the potential cooling that may be harvested from the LPG fuel system on a 2000 cm 3 engine was 1.4 kW in the eco-driving mode to be used as a cabin cooler. For a small passenger car that has a cooling load of 3.5 kW, this means the cooling effect from the fuel system is capable of contributing 40% to the cooling load. In conclusion, this potential is very promising and can be applied to countries that not do have the winter experience.
The 2-stroke gasoline engines produce high air pollution because there is fuel wasted directly into the exhaust during the scavenging process. Solution to overcome the problem of pollution and improve engine performance is changing the fuel system into a direct injection fuel system. This study aims to determine the performance characteristics (power and torque) of two stroke gasoline direct injection engine in variations in injection duration and fuel pressure entering the combustion chamber with fixed injection timing 85° before TDC. The timing of fuel injection is carried out by a solenoid valve which is regulated using a disc board mounted on a crankshaft and detected by infrared sensors. Variations in the degree of duration of injection testing are 45°, 55° and 65°, in variations of fuel pressure of 6 bars, 7 bars and 8 bars The tools used for data collection are pressure gauge to measure fuel pressure and a tachometer is used to measure engine speed and engine torque measured by Prony brake. The results of this study indicate that increasing the duration and fuel pressure will increase power but do not directly affect the increase in torque, both because there is a certain duration and pressure which results in maximum performance.
Medicine and biomedical research activities require cold storage to store biomedical specimens such as, for example, stem cell, sperm, blood and other organs. During storage, to prevent the specimen from damage required a special cold storage reaches -80°C [1]. Using single cycle refrigeration machine can only reach -40°C, and performance deteriorates below -35°C drop in pressure associated with evaporation. Thus, to reach lower temperatures, use cascade refrigeration machine [2]. During this low-temperature circuit cascade refrigeration systems still use refrigerants that contain ozone-depleting or global warming (CFCs and HCFCs). To overcome this, a mixture of carbon dioxide and ethane azeotropic a promising alternative refrigerants. Simulation studies and experiments indicate a mixture of carbon dioxide and ethane were able to achieve the minimum temperature to -80°C [4-7]. With the mass ratio 70% R170 and 30% R744 circuit at low temperature refrigeration systems and uses a capillary tube expansion device 0.054 inch diameter with a length of 6 meters and 3 meters then use an electric heater as the cooling load. Cooling load is given by the variation of 90 W, 120 W and 150 W at a cabin in the low temperature circuit. From the experiment will be known characteristics of cascade refrigeration system with refrigerant mixture and will get the parameter data to make cascade refrigeration machine.
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