1,721,017 research outputs found
Akibat negatif lebih rendahnya efisiensi termal PLTN dibandingkan dengan PLTU.
Full text linkDisamping beberapa keunggulan nyata dalam penggunaan PLTN apabila dibandingkan dengan PL TU, maka PLTN masih mempunyai beberapa kelemahan. Salah satu kelemahan itu adalah lebih rendahnya efisiensi termal yang disebabkan oleh terbatasnya flux kalor yang boleh dilepaskan pada inti reaktor dengan mengingat suhu leleh dari bahan penyusun inti reaktor tersebut. Terbatasnya kalor yang dilepaskan ini menyebabkan suhu fluida pendingin reaktor juga terbatas. Dengan demikian fluida pendingin ini akan memberikan kalornya kepada fluida penggerak turbin (di dalam pesawat Pembangkit Uap) dengan suhu rata-rata yang lebih rendah. Lebih rendahnya efisiensi termal ini menyebabkan PLTN membuang kalor ke lingkungan sekitar yang lebih banyak dibandin
PEMROSESAN SECARA TERMAL SAMPAH PADAT DALAM RANGKA BAKAR
Full text linkAbstrak
Ada beberapa langkah untuk mengatasi problema sampah. Sebelum dibuang ke tempat penimbunan seharusnya sampah diproses terlebih dahulu. Salah satu tujuan pemrosesan ini ialah untuk mengurangi kadar karbon organik. Pemrosesan sebaiknya dilakukan secara termal di dalam rangka bakar.
Analisis model matematis telah dilakukan terhadap proses perubahan kadar karbon di sepanjang rangka bakar. Kecepatan berkurangnya kandungan karbon merupakan fungsi dari beberapa parameter, terutama: massa udara pembakaran dan suhu reaksi sampah. Massa udara pembakaran harus dioptimalkan untuk mencapai waktu proses yang sesingkat mungkin dan rangka bakar yang sependek mungkin
PENGARUH JUMLAH SUDU RODA JALAN TERHADAP UNJUK KERJA TURBIN ALIRAN SILANG = The Effect of Runner Blade quantity on the Performance of Cross-Flow Turbine
Full text linkABSTRACT
Design and fabrication of a cross-flow turbine runner have an impact on its performance. This research was intended to identify the effect of the number of blades on the cross-flow turbine performance. Hopefully, the results would be fruitful for science, particularly for those investigation of the cross-flow turbine issues and the micro-hydro subjects in choosing the right number of blades.
This research was carried out experimentally by on five runners with 110 mm in diameter and 84 mm in width and the number of blades were 13, 18, 23, 28, and 33. It was run under small-scale micro-hydro power station with a head of 5.48 m. The rate of discharges employed in this research were 4 L/s,
5 L/s, and 6 L/s. The runner rotation was measured with a tachometer, and a multi-meter measured the output power.
The results showed that increasing the number of blades showed better performance, but after a certain number of blades, it would gradually getting worse. The tests with discharges of 4 and 5 L/s produced the highest rotation of the runner with 33 blades, while for the discharge of 6 L/s, it was obtained by the runner with 28 blades. The greatest power output of the generator was produceed by the runner with 33 blades : 10.17 W under 4 L/s of discharge and 34,234 W under 5 L/s, while under
6 L/s of discharge the runner with 28 blades gave the greatest power output of 58.422 W. The highest efficiency of 5.55 % was found under 4 L/s of discharge and of 15.27 % under 5 L/s of discharge obtained by the runner with 33 blades. For the discharge of 6 L/s the highest efficiency of 22.31 % was obtained by the runner with 28 blades.
Keywords : Number of runner blade, Discharge, Rotation, Output power, Efficienc
Simulasi komputer laju pembakaran bahan bakar padat sebagai fungsi dari beberapa parameter
No full textCharacteristics of Waste Plastics Pyrolytic Oil and Its Applications as Alternative Fuel on Four Cylinder Diesel Engines
No full textWaste plastics recycling using pyrolysis method is not only able to decrease a number of environment pollutant but also able to produce economical and high quality hydrocarbon products. Two experiments were conducted to completely study Waste Plastic Pyrolytic Oil (WPPO) characteristics and its applications. First experiment investigated oil characteristics derived from pyrolysis process in two stages batch reactors: pyrolysis and catalytic reforming reactor, at maximum temperature 500oC and 450oC respectively. Waste Polyethylene (PE), Polypropylene (PP), Polystyrene (PS), Polyethylene Terepthalate (PET) and others were used as raw material. Nitrogen flow rate at 0.8 l/minutes was used to increase oil weight percentage. Indonesian natural zeolite was used as catalyst. Then, second experiment was carried out on Diesel Engine Test Bed (DETB) used blending of WPPO and Biodiesel fuel with a volume ratio of 1:9. This experiment was specifically conducted to study how much potency of blending of WPPO and biodiesel in diesel engine. The result of first experiment showed that the highest weight percentage of WPPO derived from mixture of PE waste (50%wt), PP waste (40%wt) and PS waste (10%wt) is 45.13%wt. The more weight percentage of PE in feedstock effected on the less weight percentage of WPPO, the more percentage of C12-C20 content in WPPO and the higher calorific value of WPPO. Characteristics of WPPO such as, Specific Gravity, Flash point, Pour Point, Kinematic Viscosity, Calorific value and percentage of C12-C20 showed interesting result that WPPO could be developed as alternative fuel on diesel fuel blending due to the proximity of their characteristics. Performance of diesel engine using blending of WPPO and biodiesel on second experiment gave good result so the WPPO will have great potency to be valuable alternative liquid fuel in future, especially on stationary diesel engine and transportation engine application
Pengaruh waktu Penyalaan Terhadap Kinerja Spark-Ignation Engine Berbahan Bakar LPG
Full text linkIn the present research, the effects of ignition timing on poformance of a LPG fueled spark-ignition engine have been experimentally examined. The research was conducted by introducing an LPG conversion kit in a gasoline engine test bed. Variations of brake torque, power, air-fuel ratio, and specific fuel consumption on engine speed (rotations per minute) were measured at several ignition timings. The present results show the maximum torque and power of the LPG -fueled engine are 20-30% lower than those of the gasoline fueled engine. It is identified that the mixture of LPG and air in the LPG fueled engine is too lean, so that the flame speed is lowered. To increase the performance of the LPG-fueled engine, the ignition timing needs to be advanced than the standard ignition timing of the gasoline fueledengine
The Use of Inclined Tuyer and Its Effect on the Compatibility of Downdraft Gasifier Fed by Rice Husk and Wood Sawdust
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