Denny Widhiyanuriyawan
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya

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Peningkatan Kualitas Bahan Bakar Biogas Melalui Proses Pemurnian Dengan Zeolit Alam Hamidi, Nurkholis; Gede Wardana, I Nyoman; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Biogas from digester consists primarily of methan (CH4) and carbondioxyde (CO2). Trace components that are often present in biogas are water vapor (H2O) , hydrogen sulfide (H2S),hydrocarbons (HC), ammonia (NH3, oxygen (O2), carbon monoxide (CO) and nitrogen (N2). In order to improve the quality of biogas, a cleaning process to remove the trace components and an upgrading process to adjust the calorific value are needed. A number of techniques have been developed to remove the trace components from biogas. In this experiment, however, chemical absorption of CO2 and H2S by solid zeolite in a plastic bag was experimentally investigated. The solid zeolite was activated by heat treatment and KOH. Absorption characteristics were examined. Test results revealed that the solid zeolite used were effective in adsorbed CO2 and H2S in biogas, creating CH4 enriched fuel. Absorption capability was transient in nature. With regular replacement or regeneration of used solid zeolite, upgraded biogas can be maintained. This technique proved to be promising in upgrading biogasquality.Keywords: KOH compound, calorific value of biogas, zeolite.
Pengaruh Variasi Sudut Static Mixer Terhadap Kinerja Heat Exchanger Widhiyanuriyawan, Denny; Purnami, Purnami; Ardiansyah, Ardiansyah
Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This study was proposed to determine the effect of static mixer on innertube installation of double pipe heat exchanger. The dimenssion of outer (hot fluid) and inner (cold fluid) pipes of heat exchanger were 76.2 mm and 25.4 mm, respectively. Static mixers with 19 mm diameter and 60 pieces number were variated with θ=40o, 80o, and120o. The hot fluid discharges were variated from 400 to 900 liters/hour and the constant of cold fluid discharge with 900 liters/hour. The results show the heat transfer rate of statics mixer with angle variation higher than plain tube (without static mixer).The heat transfer increased 24%, 39%, and 44% for variation angel of static mixer with θ=40o, 80o, and 120o, respectivelly.Keywords: Static mixer, heat transfer rate
Karakteristik Produksi Browns Gas Dengan Menggunakan Tenaga Matahari Widhiyanuriyawan, Denny; Hamidi, Nurkholis; Wijono, Wijono
Rekayasa Mesin Vol 4, No 1 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Renewable energy has potentials to be developed to meet our energy needs in the future. One promising energy source is browns gas. Browns gas is a mixture of di-atomic and mono-atomic of hydrogen and oxygen. One effort to produce browns gas is through the process of electrolysis of water. However, the process of electrolysis still considered a process uneconomical and inefficient, since the energy of electrochemical decomposition of water is relatively high. Thus, the challenge of brown gas production is reducing electrical energy. In this study, we propose to use solar energy for browns gas production plant, since the solar energy is environmentally friendly energy sources available so abundant in Indonesia. The experiment was carried out in two methods. First, the electrolysis was done using electricity produced by the solar panel directly without voltage control. The second method, the voltage of electricity from the solar panel was controlled using a regulator then it used for the water electrolysis. The results show that the direct method generates fluctuative electricity with the rate power of 29.67 Watt. This electricity was used for electrolysis process and produced brown gas 0,1393 g for 4 hours. On the other hand the in-direct method generated power relatively constant at 18.3 Watt and produced the brown gas about 0.1365 g.Keywords: solar energy, browns gas, electrolysis, hydrogen
Pengaruh Temperatur Larutan Triethylamine (Tea), Air dan Ca(OH) 2 terhadap Pelepasan CO 2 pada Proses Pemurnian Biogas Kurniawan, Zulkifli; Wardana, ING; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 5, No 1 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Biogas is renewable fuel that generated by bacteria activities in anaërobic organic matter process. Biogas composed by CH 4 17 (54% to 70%), CO2 (27% to 45%) and impurities gas such as N2 , H2O, CO, H2S. The CO2 on biogas should be reduced because it?s as inhibitor that reduces heat of biogas flame. This research proposed to reduce CO 2 in the packed column purification system by using TEA, H2O, and Ca(OH)2 solution as absorber.The absorber temperature were variated 35o, 45o, 55omand 65oC for knowing performance absorber reduce CO2 at the flow rate of CO 2 and CH4 , entering packed collum by 0.1 l/m, release time of CO2 in heater was eight minutes by comparison CH4 , and CO2 i.e. 80 % -20 %, 85 % -15 %, 90 % -10 % and 95 % -5 %. The result of this study was the higher the temperature heating, the higher the percentage of CO2 released. Absorbentt TEA + H2O and combined TEA + H2O + Ca(OH)2 , improve absorption of CO2 in a linear manner at a temperature of warming 35, 45, 55, 65 c.Keywords : Biogas, Absorption, Temperature, TEA, H2O, Ca(OH)2
Optimalisasi Destilasi Nilam Kering melalui Pembekuan Pra Destilasi Sugiarto, Sugiarto; Sonief, A. As?ad; Sutikno, Djoko; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 5, No 1 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The process of extracting oil from the leaves or stems cells by damaging the cell which usually done before or during distillation process. Damaging the cell can be done by mechanical process or freezing process. Chopping the leaves was done to damage the cells through the mechanical process, however the damage have not been able to destroy up to the celular level. While the freezing process could be expected to damage the tissue at the cellular level. Pure research on laboratory scale was used as the experiment method in this study. Freezing temperature pasca-distillation was variated on -13,4 ºC, -19,6 ºC and -24,8 ºC and without freezing process. While distillation process was varied on 95 ºC, 105 ºC dan 115 ºC. In this study, patchouli was distilled on wet and dry condition. LPG was used with automatically combustion control system of for keeping the temperature stability, increasing the capacity and quality of patchouli oil and reducing the production cost and the distillation time to less than 6 hours The stable distillation temperature was able to raise the volume of oil per kilogram of dry weight raw material and decrease the distillation time to less than 5 hours. Patchouli oil volume produced per kilogram of dry raw materials post freeze predistillation increased with increasing the distillation temperature. The low freezing temperature of the pre-distillation produced the high volume of patchouli oil per kilogram of raw material. Pre-distillation on the freezing process of dried patchouli was able to shorten the time of maximum distillation only in 3 hours. The range of distillation temperature on 95 ?C, 105 ?C and 115 ?C produced the different colors of patchouli oil from light brown to dark brown color.Keywords : optimalisation, distillation, dry patchouli, freeze pre-distillation
Pengaruh Variasi Sudut Input Sudu Mangkok Terhadap Kinerja Turbin Kinetik Anam, Asroful; Soenoko, Rudy; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The most of renewable energy in Indonesia is hydro which all potential is for about 75000- 76000 MW. But the use of that potential is 3,783 MW of large-scale and 220 MW of small-scale only. The use of small-scale hydro energy is river flows which has speed with ranges 0.01 - 2.8 m/s and used for a source of electrical energy by kinetic turbines. Kinetic turbine is one of water turbines but it uses speed of river flows for changing the water?s kinetic energy into mechanic one. The performances of the kinetic turbines depends on many factors and one of them is the using of blades on the runner. Turbine with a cup blade, river flows mashes the blade and changes momentum that can provide the runner rotating. On that process, there is energy change, here is kinetic energy of river flows into mechanical one and produces electricity energy by a generator. So the purpose of this study is to determine the effect of kinetic turbine performance with a cup blade input corner variations. The results of this study indicates that the kinetic turbine with a cup blade input corner 10 o is the highest or maximum performance than 15 o and 20 o , because the cup blade input corner 10 o has much mass flows mashing and striking the blade and the kinetic turbine with cup blade input corner 20 o is the minimum performance.Keywords: Kinetic turbine, Turbine performance, bowl blade, input corner.
Optimasi Hardening Baja Karbon Sedang dengan Fluida Getah Pohon Pisang Menggunakan Metode Taguchi Dimu, Roymons Jimmy; Widhiyanuriyawan, Denny; Sugiono, Sugiono
Rekayasa Mesin Vol 5, No 2 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The aim of this research is to increase the hardness of the material with hardening process. Factors that influence the hardening process are the raw material, the heating temperature, holding time and cooling medium. To obtain the optimum combination of factors hardening process, this research adopted the Taguchi experimental design method. The type used were orthogonal array L9 (34) which generates a combination of 4 factors with each factor has 3 levels.Raw materials used were retrieved from the leaf springs trucks, jeeps and minibuses which are medium carbon steels with different chemical compositions. Based on the heating temperature recommended for medium carbon steel hardening process is between 723 - 900ºC then the heating temperature used 723ºC, 800ºC, 850ºC. Whereas for the holding time that carbon steel is recommended for 5-10 minutes, then the holding time used were 5, 7.5, 10 min. For the cooling medium used in this research are banana tree sap fluid and also water and oil as a comparison. In this research presented the results of hardness test hardening process with a combination of treatments truck spring steel material, temperature 850ºC, 10 min holding time and cooling medium with banana tree sap fluid in order to get the highest hardness worth HRC 63.03. Based on the analysis of Taguchi method can be seen that the four factors the most influence on hardness of material is temperature, holding time, cooling medium, and the smallest is the material.Keywords: Hardening, Banana Tree Sap Fluid, Taguchi
PENGARUH VARIASI TEMPERATUR TERHADAP MASSA DAN ENERGI YANG DIHASILKAN PIROLISIS SERBUK KAYU MAHONI (SWITENIA MACROPHYLLA) PADA ROTARY KILN Qiram, Ikhwanul; Widhiyanuriyawan, Denny; wijayanti, widya
ROTOR Vol 8, No 2 (2015)
Publisher : ROTOR

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Abstract

Pirolysis is thermochemical decomposition process of biomass into useful product. A method that can be used is a rotary kiln pirolyzer which consist a heating cylinder that rotate with a certain rotation speed. This research is aimed to get the effet of temperature due to char product quantity of switenia macrophylla rotary kiln pirolysis.The research is done by pirolysis experiment with 200 gram of switenia macrophylla in dust form. Temperature heating is varied 250 C, 350 C, 450 C, 500 C, dan 600 C. The heating temperature is provide by eletric heater with control system. Temperatur is measured with K type thermocouple. The heating process is taken for 180 minutes using stopwatch. The measurement is done for biomass and char volume using measuring cup. Mass is measured using scale. Low heating value is measured using bomb calorimeter.The result show that temperatur has effect due to char product of switenia macrophylla rotary kiln pirolysis. Char mass loss tend to increase due to temperature increasing. Low heating value and char porosity tend to increase due to mass loss percentage increasing. Shrinking factor and percentage of yield energy tend to decrease due to mass loss percentage increasing. Keywords: pirolysis, rotary kiln, char, temperature
Karakteristik Pembakaran Biobriket Kulit dan Cangkang Karet (Hevea Brasiliensis) dengan Perekat Glyserin Mariki, I Wayan Wawan; Wahyudi, Slamet; Widhiyanuriyawan, Denny
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 (550.831 KB) | DOI: 10.21776/ub.jrm.2017.008.01.1

Abstract

Some studies have been done on utilizing biomass from agriculture such as the leather and shell of rubber (Hevea brasiliensis) were not used optimally in Indonesia as an alternative energy which developed by making biobriquet to achieved the higher energy that could be used in the combustion process. In this study, the biobriquet was made of the leather and the shell of rubber by comparisson of the leather and shell were: 0%: 91%; 45.5%: 45.5%; 55%: 36%; 64%: 27%; 91%: 0%.Glyserin 9% for each percentage of biobriquet was used as adhesive material and the drying temperature of 110 C. This study aims to investigate the characteristics of biobriquet combustion which made of the leather and shell of rubber. The results shows that the biobriquet combustion process which made of 64% rubber leather and 27% rubber shell has a calorific value of 5313,923 Kal/gr. In 20 seconds of initial ignition, the combustion process shows the improvement such as increased concentrations of the flammable leather, bluish red fire.
Simulasi Numeris Karakteristik Pembakaran CH4/CO2/Udara dan CH4/CO2/O2 pada Counterflow Premixed Burner Wicaksono, Hangga; Sasongko, Mega Nur; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (757.448 KB) | DOI: 10.21776/ub.jrm.2017.008.02.6

Abstract

The high amount of CO2 produced in a conventional biogas reactor needs to be considered. A further analysis is needed in order to investigate the effect of CO2 addition especially in thermal and chemical kinetics aspect. This numerical study has been held to analyze the effect of CO2 in CH4/CO2/O­2 and CH4/CO2/Air premixed combustion. In this study one dimensional analisys in a counterflow burner has been performed. The volume fraction of CO2 used in this study was 0%-40% from CH4?s volume fraction, according to the amount of CO2 in general phenomenon. Based on the flammability limits data, the volume fraction of CH4 used was 5-61% in O2 environment and 5-15% in air environment. The results showed a decreasing temperature along with the increasing percentage of CO2 in each mixtures, but the effect was quite smaller especially in stoichiometric and lean mixture. CO2 could affects thermally (by absorbing heat due to its high Cp) and also made the production of unburnt fuel species such as CO relatively higher.