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Analisis Perpindahan Panas pada Kolektor Pemanas Air Tenaga Surya dengan Turbulence Enhancer Ramadhan, Muhammad Nizar; Soeparman, Sudjito; Widodo, Agung Sugeng
Rekayasa Mesin Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (566.537 KB) | DOI: 10.21776/ub.jrm.2017.008.01.3

Abstract

One of the solar energy utilization is solar water heater. To improve the performance of solar water heater, modifications were applied to dual absorber plate and flow channels to increase heat absorption. The aim of this study is to analyze the heat transfer of the collector solar water heater with additional modifications turbulence enhancer. Flowrate of water were varied to 1500 ml/min, 1200 ml/min, 900 ml/min, and 700 ml/min. The result shown that  the highest collector energy loss (Qloss) and useful energy (Qu) are 92.23 Watt and 653.83 Watt, respectively, in a  volume flow rate of 700 ml/min and the total solar radiation of 672.78 W/m2. The useful energy (Qu) increase with reducing the volume flow rate of water. This is due to by reducing the volume flow rate, the heated water will expose longer to absorb the heat from absorber plate.
Pengaruh Variasi Diameter Lubang dan Bentuk Profil Elektroda serta Jumlah Pelat Netral terhadap Produksi Brown Gas de Fretes, Henry Valentino; Soeparman, Sudjito; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.7

Abstract

Electrolysis is a process of decomposing water molecules (H2O) into hydrogen (H2) and oxygen (O2) with the help of electrical energy as a trigger for the process. In the electrode process, it takes two electrodes to be placed in water. Electrolysis reaction is a redox reaction, in which the reduction reaction occurs at the cathode forming hydrogen and oxidation occurs at the anode and forms oxygen. The purpose of this study was to determine the effect of variations in the diameter of the electrode hole, the shape of the electrode and the number of neutral plates on the production of Brown Gas by using NaOH as a catalyst. The electrodes used are plain, square, circle and cross shape, and the diameter of the electrode hole is 5 mm, 8 mm, 10 mm and 12 mm. besides that the number of neutral plates varied 4 pieces, 6 pieces, and 8 pieces. NaOH dissolved in water has a percentage of 1.77%. From the results of the study, it is shown that the rate of production increased as the number of neutral plates increased and the power needed by the generator also increased, but the efficiency of the generator was smaller. The diameter of the electrode hole and the shape of the electrode also affect Brown gas production, this is because the electrode cross-sectional area in contact with the electrolyte also has different values. The highest productivity value on cross shape electrode, 10 mm electrode hole diameter and the number of neutral plate 8 pieces, and the lowest in the form of the plain electrode, 5 mm hole diameter and 4 neutral plates. The lowest generator efficiency in the electrode variation is a circular shape, the diameter of the electrode hole is 12 mm and the use of 8 neutral plates and the largest in the square electrode, 12 mm electrode hole diameter and 4 neutral plates.
Corporate Performance Measurement Balanced Scorecard Through Approximation Sustainability at Pabrik Gula Krebet Baru Malang Utoyo, Utoyo; Soeparman, Sudjito; Astuti, Murti
Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

PG. Krebet Baru consists unit I/II be sugar industrial company with capacity 11.500 tcd, in this time PG.Krebet Baru cope to fulfil national sugar need only seen from ability reachess profit and tall sale level for that companies to want watchfulness aim correct performance measurement system to analyze performance with concept sustainability balanced scorecard that be method development balanced scorecard with add social environment aspect, because this aspect is very krusial to PG. Krebet Baru that presents citizen solid intermediate and, to achieve aim, used several methods AHP and OMAX also detect point of view, mission, target stipulating with performance measurement from each perspective. for researcher activity support submits kuisioner to customer 25 respondents, employee 25 respondents and 2 leadership respondents PG. Krebet Baru and PG.Candi Baru Sidoarjo. kuisioner used to measures /employee customer satisfaction with stipulating KPI complete the heavy, result kuisioner at validity test and realiabilitas. from measurement analysis result is got 30 kpi and 30 sub kpi's as a whole period performance achievement index 2009 performance scores: 7,37 (yellow) mean the performance not yet achieve target, furthermore kpi score 0 until 7 (red/yellow) as much as 27 kpi/sub kpi need repair subsidizes performance as a whole. Keywords : AHP, performance, KPI, OMAX, Sustainability
Karakterisasi Kekuatan Bending dan Hidrofobisitas Komposit Serat Kulit Waru (Hibiscus tiliaceus) Kontinyu Bermatrik Pati Ubi Kayu Rianto, Ari; Soeparman, Sudjito; Sugiarto, Sugiarto
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The development of biopolymer becomes alternative solution of the waste problem which is mostly produced by synthetic polymer. Biopolymer cassava extract which has big potency to be developed as synthetic polymer alternative. Nevertheless, the basic characteristic which is hydrofilyc and low tensile strength makes the polymer film produced not acceptable to be used as synthetic polymer alternative. The method used in this research was continous fiber biocomposite by pressed hand lay up. The matrix was Wau wood fiber which had layer variety 1,2,3,4 and the fiber directions 0o and 90o. The matrix biocomposite uses cassava extract with addition variation of gliserol 5%,10%,15% of dry weight. The experiment testing used bending test standart ASTM C 393 (1997) and moisture test standart ASTM D570-81. From this research, it was found that the highest bending result on fiber variation 3 layers and 5 % matrix gliserol was 50,58 Mpa. The highest elongation on 15% gliserol+1 layer was 35%. The lowest moisture test occurred on 1% laye and 5% matrix was 39.3%. Keywords: Biocomposite, bending, biopolymer, Waru wood fiber , gliserol.
Pengaruh Kondisi Temperatur Mesophilic (35ºC) Dan Thermophilic (55ºC) Anaerob Digester Kotoran Kuda Terhadap Produksi Biogas Darmanto, Ardyanto; Soeparman, Sudjito; Widhiyanuriawan, Denny
Rekayasa Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Content energy of biogas is not less than energy derived from petroleum, horse manure can be used as a substrate for producing biogas. A substrate in horse manure bacteria containing framer metan which is in the animal body ruminants. Temperature is one of the important factors that affect on fermentation process. The aim of study was to find characterization production and composition content biogas from horse manure on condition temperature mesophilic (35ºC) and thermophilic (55ºC). Both of digester are running simultaneously by fermentation process for 15 days. The results obtained from the condition that generated the biogas production of thermophilic higher than the condition of mesophilic and conditions without heating. Biogas production optimum of each digester generated on day 8 for thermophilic conditions, day 10 for mesophilic conditions and day 11 for the conditions without heating. The highest result of biogas production was in thermophilic conditions (0.1411 kg). The highest percentage of methane gas production (CH4) that produced by the thermophilic digester conditions (59.8%).Keywords: biogas, mesophilic, thermophilic, horse manure.
Optimalisasi Sistem Perawatan Dan Perbaikan Terencana Mesin Produksi Berdasarkan Analisis Keandalan Pada Pltd Hatiwe Kecil Kota Ambon Demmatacco, Frederik; Soeparman, Sudjito; Soenoko, Rudy
Rekayasa Mesin Vol 4, No 2 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Based on preliminary surveys, PLTD X has been operated long enough so that the generator engines often impaired even cause damages during operation. Even maintenance system contained in the PLTD X also has not done, which means there decrease in the production of electrical power generated.Maintenance activities that have been performed by PLTD X is the replacement of engine components damaged as a rejuvenation effort and overhaul that aims to extend the lifespan of the machine, but it is also the act of Preventive maintenance which aims to treat the machines that do not damage or interruption in operation. The dispute resolution process is the method for analyzing the Reliability Centered Maintenance component failure with FBD, System function and functional failure, FMEA and RCM Decision Worksheet. It also can determine the value of Mean Time To Failure (MTTF) and Mean Time To Repair (MTTR) is used to analyze systems engine maintenance. and as a basis for determining the time interval maintenance and total cost of maintenance.Based on the results of the calculation known critical components such as Cylinder Head, Inlet valve, Gasket, Exhaust Valve Housing, Exhaust Valve. Component maintenance time intervals determined by the RCM method is as follows, Cylinder Head with interval 4458 hours, Inlet Valve with 1601 hour, Gasket with 4682 Hours, Exhaust Valve Housing with 1908 hours, Exhaust Valve with 2238 hour. Critical component consisting of Cylinder Head, Inlet Valve, Gasket, Exhaust Vave Housing and Exhaust Valve is usingSchedulled Restoration Task type of maintenance.Keywords: critical components, decision worksheet RCM, FMEA, PLTD X
Heat Flux Kondensasi pada Media Arang Tempurung Kelapa (Cocos Nurifera) Yohanes, Eko; Soeparman, Sudjito; Siswanto, Eko
Jurnal Rekayasa Mesin Vol 5, No 1 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Condensation in porous media can be applied for alternative of control air humidity. Which one for each temperature variation need an hour to complete the experiments.Coconut shell charcoal installed in the condensator chamber with height 2 cm. warm vapour then entered the condensator chamber. We observed temperature distribution and absorbed warm vapour among the condensation chamber and analyze how absorbed vapour will formed. The results showed forced convection that unown from value Gr/Re <1. With the results of the heat flux at the highest point of T2 and T1. With Lyapunov Exponents M = log 2 2(...) is always a positive value, due to increased average condensate growing over time and increase included in chaos areas because there is no repetition in each attractor.Keywords : Heat Flux, Coconut Shell Charcoal and Eksponen Lyapunov.
Pengaruh Prosentase Campuran Briket Limbah Serbuk Kayu Gergajian Dan Limbah Daun Kayuputih Terhadap Nilai Kalor Dan Kecepatan Pembakaran Malakauseya, Jeffrie Jacobis; Sudjito, Sudjito; Sasongko, Mega Nur
Jurnal Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Briquette is one of alternative energy. Raw material briquettes can be derived from agricultural waste and forestry plantations. Many factors that influence on briquette such as the type of materials, adhesives and pressure others. Adhesives used are sago starch waste that has been disposed and can no longer be consumed by humans. Raw material briquettes from waste of sawdust and sawn eucalyptus leaves. Pressure briquette of 30 PSI. Both raw material briquettes sieved with 20 mesh sieve qualify. From the results, the average calorific value of briquettes is the highest of 4896.16 calories / gram at 40% mixture of sawdust sawn 60% powder mixed with eucalyptus leaves. Percentage of ash content lowest average was 2.17%.Keywords : Briquette, adhesive, sawdust, eucalyptus.
Pengaruh Pemasangan Sudu Pengarah dan Variasi Jumlah Sudu Rotor terhadap Performance Turbin Angin Savonius Ully, Dedy Nataniel; Soeparman, Sudjito; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 5, No 2 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The objectives of research were to understand the influence of the installation of guide vane on the performance of Savonius wind turbine and to acknowledge the number of rotor blade which produces the most maximum performance. There are three variations for the number of rotor blade, which are 2, 3 and 4 blades on the range of wind speed are 4-7 m/s. Result of research indicated that rotor with three blades can give better performance than rotor with two and four blades. Rotor with guide vane has produced better performance in power coefficient rate for 0,3638 at wind speed 5 m/s, while rotor without guide vane can only provide power coefficient for 0,2595 at similar wind speed 5 m/s.Keywords: Wind Energy, Savonius Wind Turbine, Guide Vane and Performance
Faktor-faktor yang Mempengaruhi Keberhasilan Studi Mahasiswa Penyandang Disabilitas Soeparman, Sudjito
IJDS:INDONESIAN JOURNAL OF DISABILITY STUDIES Vol 1, No 1 (2014): -
Publisher : Pusat Studi dan Layanan Disabilitas Universitas Brawijaya (PSLD UB)

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Abstract

Dengan diratifikasikan Konvensi PBB tentang hak penyandang disabilitas menjadi Undang-undang no. 19 tahun 2011, pendidikan inklusif bagi penyandang disabilas wajib dilaksanakan di Indonesia. Penelitian ini melakukan studi faktor-faktor yang mempengaruhi keberhasilan studi mahasiswa difabel dalam system pendidkan inklusif. Faktor-faktor yang diteliti adalah faktor keluarga (hubungan dalam keluarga dan kondisi ekonomi), factor psikhologis (rencana studi dan kepercayaan diri), dan factor akademik (kehadiran, pilihan Program Studi, lama belajar,  cara belajar, kendala belajar, dan IPK). Pengumpulan data dilakukan melalui kuesioner, dengan responden semua mahasiswa difabel dan mahasiswa non-difabel dalam kelas yang sama. Hasil penelitian menunjukkan bahwa tidak ada perbedaan dalam faktor keluarga dan psikhologis antara mahasiswa difabel dan non-difabel. Mahasiswa difabel cenderung lebih lama dan teratur, dan prestasi akademik mahasiswa difabel cenderung lebih baik daripada non-difabel.