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All Journal Semesta Teknika Media Mesin: Majalah Teknik Mesin JMPM (Jurnal Material dan Proses Manufaktur) Turbo : Jurnal Program Studi Teknik Mesin BERDIKARI : Jurnal Inovasi dan Penerapan Ipteks Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Prosiding Seminar Nasional Program Pengabdian Masyarakat
Sudarja Sudarja, Sudarja
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Social Sciences

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Journal : Semesta Teknika

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Perilaku Antarmuka Berdasarkan Data Beda Tekanan pada Peristiwa Kondensasi Aliran Uap Dengan Pendinginan dari Luar Searah pada Pipa Horisontal Berbasis Domain Waktu Sukamta Sukamta; Hasan Asy Ari Dwiearto; Sudarja Sudarja
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211214

Abstract

A two-phase flow pattern experiment on the condensation event of steam flow with external cooling based on the measurement of pressure difference within a horizontal pipe is carried out by varying the superficial velocity. Annulus pipes with inner pipe material made of copper and outer pipe made of galvanized iron (GIP) within an insulation of 10 mm thick were used in this experiment. The length of the pipe is 1.6 meters, outer diameter of 4 inch and inner diameter of 17 mm. The two-phase flow pattern was investigated based on differential pressure fluctuations between the inlet and outlet. To support the observation, flow pattern visualization was performed using a transparent pipe with a diameter of ¾ inch and a length of 1.3 meters connected to the test pipe section. The superficial vapor velocity was carried out from JG = 0.0689 m/s to JG = 1,9117 m/s. The results showed stratified flow patterns for the lowest superficial velocity and also obtained wavy, wavy-slug, and slug. Annular flow patterns can not be observed in this experiment. In general, increasing superficial velocity of steam will cause a significant increase in pressure fluctuations.
Analisis Rekayasa dan Karakterisasi Briket Bahan Bakar dari Limbah Serat Kenaf Sudarja Sudarja
Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i1.758

Abstract

The amount of rejected hibiscus cannabinus fiber reaches 30% during harvesting and 10% of the fiber bought by industries because they are not satisfied the quality requirement. In other words, 37% of the harvested hibiscus cannabinus fiber is rejected and become waste. On the other hand, the society need alternative fuel instead of fossil fuel due to its availability and high-price. Therefore, a study on the utilization of hibiscus cannabinus fiber waste for alternative fuel is urgently required. The main materials used in this research are hibiscus cannabinus fiber waste and starch glue. The first step is producing star-coal by burning the hibiscus cannabinus fiber in a closed tube (chamber) followed by producing starcoal briquette by blending starcoal powder and starch glue, and finally, pressing it in a pressing machine. The characteristic being studied are: water content (comply to ASTM-D-3173), calorific value (ASTM D-2015 and ASTM D-5865-03), and ash content (ASTM D-3174). The result of the research shows that the average calorific value of hibiscus cannabinus fiber waste is 6595,65 kal/gram while that of the briquette compacted  at 1090 psi or above was 7394,14 kal/gram. The average water content was 10,9%, and ash content is 31,67%. Advanced study concerning the percentage of fly ash and economic aspects was recommended in order to justify its feasibility.
Pembuatan Alat Uji untuk Mengikat Partikel Logam yang Terkandung dalam Pelumas Akibat Gesekan Mesin Sukamta Sukamta; Sudarja Sudarja; Nurdarojat Nurdarojat; Agung Prasetyo
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.422

Abstract

One of the factors that can affect to the quality of lubricantion is metal particle content due to friction of engine parts.  Metal particle in lubricanting oil could damage the engine parts, so it is neccessary to reduce the metal particle content which mingled in lubricant oil. The experiment was conducted in laboratory scale using power magnetic type ring neodymium possessing diameter of 19 mm and thickness of 2 mm. The experiment was conducted by flowing the lubricanting oil containing metal particle continually and put the magnets in engine so that the metal particle will be taken up by the magnets. The experiment used  three variations of time (5, 10 and 15 minutes) and three variations of valve to controlling the flow rate using. The highest  absortion of metal  particle was reached on opening valve 30 for 15 minutes. When volume the flow rate was 200 ml/s and the time was 15 minutes  the result of absortion was 7.48 % (magnet A), meanwhile for volume the flow rate 180 ml/s and the time was 15 minutes resulted in particle absortion of about 7.37 % (magnet B). When Magnet A and B used together and at the same flow rate and time, i.e. 180 ml/s time 15 minutes, resulted the particle absortion about 17.98 %.
Analisis Unjuk Kerja Boiler Feed Pump Turbine Untuk Kapasitas Ketel Uap 2000 Ton/Jam Di PLTU Cirebon Jawa Barat Sukamta Sukamta; Sudarja Sudarja; Muhammad Mujaddid Ighna Wathon
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i1.702

Abstract

Boiler feed pump turbine (BFPT) has an important role in the circulating of demin water from deaerator to the separator of  steam power plant operations (PLTU) in Cirebon. Flow rate, temperature and  pressure were important parameters in boiler feed pump process. Based on the BFPT function, it was necessary to do the analysis interpretation of the performance BFPT. Data needed for evaluation include pressure and temperature on the suction, pressure and temperature on the discharge, and flow capacity. In this study, the data were taken starting in January to December 2014. Data processing was performed using a centrifugal pump calculations, presented in tables and graphs using MS Excel. Analysis of data using qualitative interpretation of quantitative data. BFPT efficiency during operations in 2014 decreased in February - March amounted to 17.91% (BFPT A) and 18.04% (BFPT B). BFPT A highest efficiency obtained in January amounted to 73.76%, the lowest in March amounted to 55.45%. The highest efficiency BFPT B in February amounted to 72.94%, the lowest in March amounted to 54.9%. Change of Performance BFPT occur due to changes load generator power plant that led to the pressure change  and flow capacity. Other factors that degrade the performance because BFPT was operated continuously for 24 hours and the age of  BFPT sufficient old  cause decrease in pump performance.
Pengaruh Fraksi Udara Terhadap Koefisien Perpindahan Kalor Kondensasi Refrigeran Petrozon Rossy-22 Di Dalam Pipa Tegak Sudarja Sudarja; Purnomo Purnomo; Prajitno Prajitno
Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i2.840

Abstract

Petrozon Rossy-22 is one of hydrocarbon refrigerants which environmentally safe, since there is no effect on either ozone depletion or global warming. In the refrigeration cycle, imperfect vacuuming process or other factors that permit circulation of air taken place in the system predicted influencing heat transfer rate in condenser. Therefore, research on the influence of air fraction against condensation heat transfer coefficient of Petrozon Rossy-22 inside vertical pipe to be done. A modified refrigeration system of vapor compression was applied in this research, where the condensation was done in the 2 meters straight vertical condenser (double pipe heat exchanger, that further called as test section). The diameter of internal and external pipe were ¾” and 1 ¼” respectively. Electric heater was installed on upstream of the test section. Mixture of air- refrigerant was flowed downward inside internal pipe, while cooling water was flowed upward through annulus. The varied parameters were: air fraction, air-refrigerant and cooling water flow rate. The result of the research indicated that condensation heat transfer coefficient significantly decreased when air fraction increased. The proposed empiric equation is :       Nu = 0.0138. (1-w)8.8198. Re0.7941. Pr4.7315with determination coefficient of 0.6927 and average absolute deviation of 17.65 %. The equation was for Re= 6.922-12.953, Pr= 2,008-2,696, and w= (0,25-1)%.
Co-Authors Agung Prasetyo Aldi Rahadian Ilham Ari Dwiearto, Hasan Asy Cahya Tresna Pradana Haris Suhatno Hasan Asy Ari Dwiearto J Pramana Gentur Sutapa J Pramana Gentur Sutapa, J Pramana Gentur Jayadi, Farid Kamiel, Berli Paripurna Komolosari, Eli Kuncoro Diharjo Kuncoro Diharjo Metra Prayogi Rianda Mochamad Syamsiro Muhammad Mujaddid Ighna Wathon Nurcahyadi, Teddy Nurdarojat Nurdarojat Nurdarojat, Nurdarojat Nurrahman, Budi Prajitno Prajitno Prajitno Prajitno Prasetyo, Agung Purnomo Purnomo Purnomo Purnomo Raden Mohamad Herdian Bhakti S Sukamta Sarip Sarip Sarip, Sarip Suhatno, Haris Sukamta Sukamta Sukamta Sukamta Sukamta Sukamta Sukamta Sukamta Sukamta, Sukamta Wahyu Widodo Wahyudi Wahyudi Wahyudi, Wahyudi Wathon, Muhammad Mujaddid Ighna