Cassava biogasoline was tested on electronic fuel injection vehicles in urban traffic conditions with varying engine load. Biogasoline tested includes B0, B10, B20, and B30. The engine speed was operated within 750 to 1800 rpm (low-speed range) to simulate urban traffic condition. The engine load was varied through the operation of air conditioner (AC). Fuel consumption was measured in real terms (ml/s) and CO emissions were measured with the Hesbon HG 520 Engine Gas Analyzer (EGA) in the percentage of total exhaust gas. The results showed that B10 has the lowest fuel consumption of 0.24 ml/s in conditions without AC and 0.41 ml/s with AC. Meanwhile, CO emissions tend to be constant with change in the proportion of cassava biogasoline and increased with additional AC load.
The purpose of this research are: 1) Knowing the exhaust gas emission test result from Honda Brio Satya with variation of fuel 2) Knowing the type of fuel that produces the lowest exhaust gas emission value. This research is using experimental method. This research was conducted in the automotive workshop of SMKN Udanawu Blitar Regency. Test media is a Honda Brio Satya type E 2017. The emission test used QROTEC QRO 402 gas analyzer. The results show that: 1) There is influence of fuel type to vehicle exhaust emissions, both at idle and intermediate rotation; 2) The average of CO gas emissions at idle rotation with fuel of each premium, pertalite and pertamax are 0.026%, 0.023% and 0.003%. The average of HC gas emission at idle rotation in each fuel type are 87 ppm, 86.3 ppm and 30 ppm. Thus, pertamax fuel produces the lowest level of exhaust emissions. The third fuel type still meets the threshold of motor vehicle emissions threshold in accordance with PERMEN LH No. 5 of 2010 so it is worthy to be used as an environmentally friendly learning media.
The increase in NOx levels produced by CNG-fueled engines occurs when the fuel switches from gasoline to gas fuel (CNG). The author changed the otto 4 stroke gasoline engine, into a CNG-fueled motorbike and provided additional cooling in the form of a burst of air to the cylinder block. Changes in engine block temperature are detected using a temperature sensor placed on the engine oil. Bursts of air cooling result in temperature changes in engine oil. Changes in engine oil temperature are accompanied by changes in the resulting NOx emissions. This study shows that with a decrease in engine oil temperature in the combustion engine, NOx emission levels also decrease. From the research results it can be ignored that by providing additional air bursts will be able to reduce NOx emissions by up to 18%
An experimental study in condensation has been conducted to analyse the condensation phenomena. The enhancement heat transfer performance is as always highlighted phenomenon for being investigated. The modified surface is a common method for enhancing the performance of condensation since inducing the droplet on the surface. The droplet leads to increasing heat-transfer area, decreasing thermal resistance, and shorten the condensing cycle. The condensation by using water successfully induces droplets on the surface and enhances the heat transfer. But water and refrigerant have different fluid properties which induce different phenomena whereas refrigerant is widely used in industry. In this case, the condensation is conducted on the modified surface by using a commercial promotor to investigate the phenomena. The investigation results show that the surface tension immensely influences the condensate on the surface. Refrigerant is low surface tension fluid which leads to the difficulty of fluid for inducing droplets and almost no enhancement heat transfer performance since the results almost fitted well to Nusselt bare tube prediction around 2443-3063 W/m2 oC with subcooled temperature 2 up to 5 oC.
UD Arang Tempurung merupakan usaha dagang yang bergerak dalam bidang produksi arang tempurung kelapa dan serbuk arang tempurung kelapa. Sistem pengayak digerakkan oleh motor bakar yang berdampak pada putaran yang tidak konstan. Hal ini mempengaruhi hasil ayakan dan membutuhkan tenaga terampil untuk perawatan. Bahan saringan terbuat dari bahan yang kurang tahan korosi. Permasalahan selanjutnya adalah pekerja belum menggunakan alat pelindung diri (APD) saat bekerja sehingga rentan terhadap penyakit pernafasan akibat lingkungan kerja yang tercemar. Untuk mengatasi permasalahan tersebut, tim PkM merancang penyelesaian masalah dengan tahapan: (1) Pemetaan masalah, (2) Pemecahan masalah, (3) Pembuatan alat, (4) Sosialisasi alat (5) Evaluasi Pemantauan Produktivitas Mitra (6) Sosialisasi Keselamatan dan Kesehatan Kerja (K3). Penggunaan alat pengayak dengan motor listrik terbukti dapat menekan biaya operasional mencapai 90%. Selain biaya operasional yang dapat ditekan, waktu operasional kerja per 1,3 ton produksi juga mengalami efisiensi mencapai 20%. Pengetahuan mitra terkait pengoperasian alat dan penerapan K3 dalam bekerja juga mengalami peningkatan. Hal ini ditunjukkan dengan adanya penerapan penggunaan APD termasuk masker ketika bekerja. Mitra juga sudah memperhatikan penempatan serta penggunaan alat-alat kerja lebih baik dengan mempertimbangkan faktor K3.
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