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All Journal Jurnal Energi Dan Manufaktur International Journal of Renewable Energy Development Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN International Conferences SDGs 2030 Challenges and Solutions JCES (Journal of Character Education Society) SENTIA 2016 Conference on Innovation and Application of Science and Technology (CIASTECH) ASEAN Journal of Chemical Engineering Scientific Journal of Mechanical Engineering Kinematika International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek)

Nurkholis Hamidi

Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya, Jl. M.T. Haryono 167 Malang

Author-ID : 273579

Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Karakteristik Pembakaran Wood Pellet Stove dengan Variasi Geometri dan Blockage Ratio Flame Connector Yuliati, Lilis; Hamidi, Nurkholis; Sasongko, Mega Nur; Ibadurrohman, Ibrahim Ahmad
Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.13

This research was intended to investigate the effect of the geometry and blockage ratio of the flame connector on the combustion characteristics of wood pellets on a wood pellet stove. Combustion characteristics observed in this research included flame visualization, flame temperature, specific fuel consumption, and corrected-specific fuel consumption. Two types of geometry were used as a flame connector, i.e. disk and cone; for each geometry, the blockage ratio was varied at 0,6, 0,7, and 0,8. The blockage ratio was varied by change the number of the circular hole on the flame connector. Combustion in wood pellet stove without flame connector was then used as a comparison. The flame visualization test was applied to find out the color and dimensions of the flame, which was then used to determine the temperature on this flame. The water boiling test method version 4.2.3 was used to determine specific fuel consumption and corrected specific fuel consumption. The combustion chamber of the wood pellet stove has a dimension of 15 cm diameter and 20 cm height. Wood pellet supply used intermittent - continuous feeding system with a mass flow rate of 16 gram/minute. Flame visualization shows that stove with cone flame connector has a larger flame dimension and flame dimension decreases with the increasing of blockage ratio. The highest flame temperature occurred near the outlet of the combustion chamber, the same conditions were observed in all variations experiment. The application of flame connector involves greater specific fuel consumption due to longer boiling time. However, a correction factor by considering the amount of evaporated water results from corrected specific fuel consumption of wood pellet stove with cone flame connector which is smaller compared to the other type of wood pellet stove.

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (150.331 KB)

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 Kadar Karbondioksida (CO2) dan Nitrogen (N2) Pada Karakteristik Pembakaran Gas Metana Wahyudi, Djoko; Wardana, ING; Hamidi, Nurkholis
Rekayasa Mesin Vol 3, No 1 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (221.112 KB)

One of the renewable energy is biogas. Biogas has a great chance in its development. Biogas resulted from fermentation process is consists of: CH4 (55-75%), CO2 (25-45%), H2 (1- 5%), N2 (0-0.3%), O2 (0.1-0.5%), and H2S (0-3%). If biogas is cleared from polluter well it will have the same characteristics with natural gas. Components of the polluter water (H2O), hydrogen and as sulfide (H2S), carbon dioxide (CO2) and some particulates should be eliminated to achieve pipeline quality gas. In order to understand how the influence of the levels of CO2 and N2 of the methane combustion characteristic. The observation was conducted experimentally by burning a mixture of stoichiometry (methane gas and air) with a percentage of CO2 and N2 in the transparent fuel square-shaped space with dimensions 500 x 200 x 10 mm. The results showed that the levels of CO2 and N2 affect the combustion process, it causing the blue flame to be fade.It indicated the combustion is not perfect and the levels of CO2 and N2 inhibits the collision reaction between molecules of methane gas and air molecules. The result also showed that CO2 reduce the flame speed. Keywords: energy, CO2, N2, combustion characteristic, methane gas, air

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (327.321 KB)

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

Purifikasi Biogas dengan Variasi Ukuran dan Massa Zeolit terhadap Kandungan CH4 dan CO2 Widhiyanuriyawan, Denny; Hamidi, Nurkholis; Trimandoko, Candra
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Nowadays, the development of the renewable energy very rapidly. It is driven by the nature of the renewable energy that has been proven to be cleaner than conventional energy, so an increase in the use of renewable energy continues to rise. Biogas is produced from biological processes (anaerobic digester) is capable of producing gas such as CH 4 , CO 2 , H 2 S, and other gases. Therefore it is very important to make the process of refining the biogas. In this research, using the biogas purification process purification method stratified, with a solution of sodium hydroxide with zeolite is purified again and again purified with activated charcoal, hence the storied purification. In this study focused on the observation of zeolite as an adsorbent, the size of the fine and coarse zeolite, and zeolite are varied mass of 50 grams, 100 grams and 150 grams. In 60 minutes, the best result obtained on zeolites fine size with a mass of 150 grams of CO 2 obtained down to 4.07%, but the pressure dropped to 0.65 kPa. With the size of the coarse zeolite at 4.26% CO 2 , with a pressure drop of 0.84 kPa. After the purification process, zeolite proved to be hidrofill with the content of the zeolite fine biggest water with 5.4%.

Pengaruh Temperatur Terhadap Entalpi dan Kinetic Rate Gas Pirolisis Kayu Mahoni Suwandono, Purbo; Wijayanti, Widya; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This study was conducted to determine the effect of temperature on gas enthalpy and kinetic rate of mahogany wood powder pyrolysis results. Research process carried out experimentally with the temperature 673 K, 773 K, 873K, 973 K and 1073 K. Pyrolysis process is carried out for 2 hours with a particle size of sawdust from 0.5 to 1 mm. The results showed that the enthalpy value increase as the temperature increase. Highest enthalpy value achieved at 1073 K, with enthalpy value is 35015.97J.Kinetic rate for temperature 873 K, 973 K and 1073 K is ð‘˜ = 1,484ð‘’ âˆ’2759/ð‘‡ , kinetic rate for temperature 673 K and 773 K is ð‘˜ = 16,5306ð‘’ âˆ’5368/ð‘‡ and ð‘˜ = 3,0373ð‘’ âˆ’2980/ð‘‡ respectively. As the temperature increase, activation energy (Ea) to decompose biomass into gases is decrease.

Pengaruh Pelat Penyerap terhadap Kinerja Solar Still di Kota Ngabang Astrada, Astrada; Soeparman, Sudjito; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.10

The purpose of this study was to determine the effect of the use of black paint and gravel as an absorbent plate on solar still performance. This research was conducted to overcome the problem of limited clean water in the city of Ngabang, West Borneo. The research method used in this study is a direct experimental method for the object under study. Tests carried out on two solars still with a variety of absorbent plates, namely concrete coated with black paint and concrete coated with gravel. Surya is still made to have the same covering glass geometry. The duration of observation is 13 hours. Data collection is carried out every 10 minutes, starting at 06.00Â until 19.00 local time. The results showed that concrete coated with gravel has higher performance compared to concrete coated with black paint as an absorbent plate on solar still. In the solar still, with gravel absorbent plates, the volume of distilled water is 3.64 L / 13 hours, and efficiency is 43.93%. Meanwhile, solar still coated with black paint as an absorbent plate producing a water volume of 2.42 L / 13 hours and an efficiency of 29.32%. The longer the observation time the sun's performance is still with gravel variations as an absorbent plate, the better it is compared to those who use black paint.

Pengaruh Clamping Frame Kayu Meranti dan ASTM A36 pada Friction Spot Joining AL 1100 dan PVC Raharjo, Rudianto; Hamidi, Nurkholis; Widodo, Teguh Dwi; Bintarto, Redi; Habibulfalah, Endi
Rekayasa Mesin Vol 11, No 2 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.02.12

In this paper, the effect of welding parameters on the shear strength of Al-PVC hybrid structures was discussed. This Research developed welding parameters in the form of Plunge Depth, heating time, and clamping frame materials. By these different parameters would result in different shear strength of welded materials. Following optimization of the process, a detailed comparison of the properties and microstructures of two different materials (meranti wood and ASTM A36 Steel) would affect to different values of thermal conductivity. The Aluminum used was Al 1100, which was welded by using a friction stir spot welding method with Polyvinyl Chloride (PVC). In this study, by the different heating times, the shear test was carried out with the ASTM D3163 standard. In this study, it was found that the maximum temperature of Aluminum occurs during the 2nd second of the welding process and then decreased in the 5th second until 60th second. However, the optimum shear strength found at 20th second. Following heat transfer and degradation materials, the 2mm plunge depth has a higher temperature and higher shear strength than 1,5mm plunge depth. Differences in the response of the two depth were attributed to the difference in mechanical interlocking. This study found that the ASTM A36 clamping frame maximum shear load of 182.4 N is higher than meranti wood frame of 125.5 N. Differences in these value are attributed to the differences of the thermal conductivity, which meranti wood had a lower thermal conductivity than ASTM A36. These have findings significant implications for the commercial application of welding hybrid structures. The best way to take advantage of the benefit of AL-PVC Structure Hybrid for friction stir spot welding would appear to be 20 second heating time, 2mm plunge depth with ASTM clamping frame.

Pengaruh Daya Penyinaran Gelombang Mikro Terhadap Karakteristik Pembakaran Droplet Minyak Jarak Pagar Dewi, Ray; Wardana, ING; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (708.566 KB)

The objective this research is to investigate the effect of microwave irradiation power on the combustion characteristics of Jatropha curcas oil. Jatropha Curcas oil is one of alternative fuel. Some advantages of this oil are environmentally friendly, not included in food which can be consumed and renewable. But it can not be use directly because it has a long chemical chain with several double bonds and the viscosity and flash point are very high. One method to improve the combustion characteristics of Jatropha curcas oil, is to irradiate this oil with microwaves. This is due to the energy of microwaves can be absorbed by water, fats and sugars that can affect the Jathropa Curcas oil. The microwave frequency used is 2.45 GHz. Microwave irradiation power is given to the jatropha oil are 119 watt, 252 watt, 385 watt, 539 watt and 700 watt, and the time given 15 minute. And droplet diameter used is 1.5 - 2 mm. From this research was found that microwave can change the viscosity, visualization and dimension of the flame, increase the burning rate, percentage of microexplosion, accelerate the appearance and prolong the duration of microexplosion.Keywords: microwave irradiation, combustion characteristic,droplet

Pengaruh Diameter Inner-Helical Fin Terhadap Characteristic of Performance Counter Flow Heat Exchanger Bula, Muhamad; Wahyudi, Slamet; Hamidi, Nurkholis
Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1366.79 KB)

The study of energy conservation using the head exchanger with different fin shapes havebeen carried out, including research on the counter flow heat exchanger using a helical spiral shaped fin is placed on the inner pipe. The problem lies in the acquisition of the influence of the diameter of the helical fin to the characteristic of performance counter flow heat exchanger. The diameter of the helical fin which the test is 8 mm, 12 mm and 16 mm. The objective is achieved, the effect of the diameter of the helical fin characteristic of performance counter flow heat exchanger in the increase of hot water discharge 400 liters / hour, 500 liters / hour, 600 liters /hour, 700 liters / hour, 800 liters / hr and 900 liters / hour. Method of design of experiments with laboratory-scale experiments using a set-up equipment double tube heat exchanger is the method used. The results obtained, the highest effectiveness for all types of helical fins foundon discharge 400 liters / h with the order from highest to lower the effectiveness of internal diameter of 12 mm reached 17.66%, diameter of 8 mm effectiveness reaches 15:56% and the internal diameter of 16 mm effectiveness of achieving 14.29%. For the plain tube efektiftasobtained 11:48%.Keywords : heat exchanger, the diameter of the helical fin, hot water discharge, effectiveness

Co-Authors A.A. Ketut Agung Cahyawan W Akhlis Rizza, Muhammad ANGGI FIRMANSYAH Aries Boedi Setiawan Aris Kurniawan Aris Subagiyo Astrada Astrada, Astrada Baananto, Fauzan Candra Trimandoko, Candra Dadang Hermawan Dedy Nataniel Ully Denny Widhiyanuriyawan Dian Dinanti Djoko Wahyudi Eko Siswanto Farid Majedi Farid Majedi, Farid Fransisca Gayuh Utami Dewi Gatot Soebiyakto Gunawan Prayitno Habibulfalah, Endi Hadi Saroso Handono Sasmito I Nyoman Gede Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G.Wardana I.N.G.Wardana Ibadurrohman, Ibrahim Ahmad Ilyas Sofana Ilyas Sofana ING Wardana Kusumaningsih, Haslinda Lilis Yuliati Lilis Yuliati Lilis Yuliati Lilis Yuliati Marali, Aryati Muhaymin Mega Nur Sasongko Moch. Syamsul Ma’arif Muhamad Bula Muhammad Satya Adhitama Munawir Munawir Munawir Munawir Nindya Sari Nur Rachman Supadmana Muda Praswanto, Djoko Hari Pudya Heryana Purbo Suwandono Rafif Ezrha Pragiwaka Ray Dewi Redi Bintarto Redi Bintarto, Redi Rudianto Raharjo Rudy Soenoko Sabila, Adriazka Fasa Sepriyatno, Riswan Slamet Wahyudi Sudjito Soeparman Sugiarto Sugiarto Suluh Elman Swara Trismawati Trismawati Widodo, Teguh Dwi widya wijayanti Widya Wijayanti Widya Wijayanti Widya Wijayanti Wijayanto, Vera Dwi Wijono Wijono

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