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INDONESIA
Journal of Renewable Energy and Mechanics
Published by Universitas Islam Riau
ISSN : 27146219     EISSN : 26148315     DOI : 10.25299
Core Subject : Social, Engineering,
Automotive Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences
REM is a peer-reviewed and open access journal that publishes significant and important research from area of Mechanical and Material Science and Development of Technology related with Mechanical Engineering. We accept submission from all over the world on English language. Our Editorial Board members are prominent and active researchers in renewable energy and mechanical engineering fields who ensure efficient, fair, and constructive peer-review process. All accepted articles will be published freely and available to all readers with worldwide visibility and coverage. REM (Journal of Renewable Energy and Mechanics) published periodically two times annually by Department of Mechanical Engineering, Faculty of Engineering, Universitas Islam Riau.
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Articles 188 Documents
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Experimental Study of Sea Wave Power Plant with Mechanical Buoying System Juhana; Abdul Rozak, Ojak; Citra Dewa, Digo
Journal of Renewable Energy and Mechanics Vol. 5 No. 02 (2022): REM VOL 5 NO 02 2022
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2022.10196

Abstract

The need for electrical energy in Indonesia continues to increase, triggering an electrical energy crisis due to the increasing number of consumers of electrical energy which has an impact on the reduction of non-renewable fossil energy sources. Alternative energy sourced from new and renewable energy is needed, the use of electric generators from ocean wave energy in coastal areas needs to be empowered to be used as electrical energy that is useful for the community. This ocean wave power plant consists of: generator, power storage and voltage riser. A fixed magnetic generator connected to the buoy ball, the kinetic energy and potential energy of the ocean waves move the buoy ball so that the generator can rotate and produce electrical energy. This system can be used as a 12 V direct current (DC) battery charger as a backup energy supply and then increased to 220 V alternating current (AC) using an inverter. The average result of generator rotation is 182.34 ratio per minute (RPM). The average voltage generated by the generator is 12.53 V and the average current is 1.06 A and the output voltage of the inverter is 217 V when the load is 100 W.
A Review of Sustainable and Renewable Sources of Energy for Afghanistan Qasimi, Abdul Baser; Isazade, Vahid; Toomanian, Ara
Journal of Renewable Energy and Mechanics Vol. 5 No. 02 (2022): REM VOL 5 NO 02 2022
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2022.10226

Abstract

Supplying energy demands in Afghanistan is a serious problem, providing demanded energy for consumption is mostly provided by neighboring countries, especially Iran, Turkmenistan, Uzbekistan, and Tajikistan. Domestic production of energy covers only an only small portion of energy demands in the country. In this regard, the energy supply in this country is extremely vulnerable and indicates non-sustainability. This study was intended to review available conducted research and published articles and reports. the results obtained from these reviews show that the utilization of renewable energy, especially, solar and wind energy, resources in Afghanistan is the only reliable and sustainable solution for the energy problem in this country. The results of the review of the previous research indicate that Afghanistan has great potential for renewable energy sources. the country has sources of renewable energy, including solar, wind, and geothermal energy.
Experimental Study of The Potential for Energy Absorption and Drying Time of Coffee Beans Using a Dome Dryer Type Dryer in The Sukmailang Area of Pesawaran Regency Santoso, Yopi Rusdian; Afisna, Lathifa Putri; Syaukani, Muhammad; Saragih, Gita Johannes
Journal of Renewable Energy and Mechanics Vol. 6 No. 02 (2023): REM VOL 6 NO 02 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.10479

Abstract

The traditional drying method has many weaknesses, namely it is very dependent on the weather, so that drying takes a long time. Traditional drying methods result in frequent contamination of dust, dirt, insects, and if wet they are prone to moss growth due to delays in drying during cloudy or rainy weather. This study designed a coffee bean dryer with electric power which is the result of converting solar energy with the help of photovoltaic which is first stored in the battery. The main components of this tool are: drying chamber, drying roof, tray, thermostat, heating element, this test is carried out to determine changes in seed moisture content, required power and efficiency. The temperature is set at 50°C with a fan speed of 3m/s. The fastest decrease in water content occurred in the mass of 1 kg coffee bean samples starting on June 22, 2022 from 28.5% water content to 12% moisture content. Meanwhile, the longest decrease in the water content of coffee beans was at a mass of 2 kg coffee beans on June 24, 2022, the initial water content of coffee beans was 29.3% to 13.2%. The greater the mass of the coffee beans to be dried, the greater the time required to dry the coffee beans using a dome dryer. The maximum power is in the Sukmailang area, Pesawaran district which has a plateau as high as 1200 meters above sea level (MDPL) with an average power of 11.38 Watt. The highest power is produced at 12:00 WIB with a value of 16.49 Watts. The use of solar panels in the Sukmailang area, Pesawaran Regency which has a plateau as high as 1200 (MDPL) is still not effectively utilized because the results obtained have an average efficiency value of 2.22%
The Effect of Reflector Angle Variations on The Performance of Solar Destilators of Wick Solar Still Type Sabarianto; Sehat abdi saragih; Anwar, Irwan; Rahman, Jhonni
Journal of Renewable Energy and Mechanics Vol. 6 No. 01 (2023): REM VOL 6 NO 01 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.10551

Abstract

Air bersih sangat dibutuhkan untuk masyarakat yang tinggal didaerah padat penduduk. Kelangkaan dan kesulitan untuk mendapatkan air bersih menjadi permasalahan yang banyak muncul dikalangan masyarakat dimana hampir sebagian besar sumber air tanah yang didapat adalah air keruh. Sumber air yang ada sudah terkontaminasi dengan tanah, logam berat, bakteri dan bahan lain yang merugikan kesehatan. Untuk mengatasi permasalahan air keruh tersebut perlu adanya usaha untuk mendapatkan sumber air yang bersih dengan menggunakan alat yang disebut dengan Destilator Surya Tipe Wick Sollar Still dengan penambahan reflektor. Untuk mengetahui pengaruh sudut reflektor pada unjuk kerja destilator surya. Kemudian mendapatkan sudut reflektor yang memiliki unjuk kerja destilator surya yang paling baik. Alat ini berfungsi sebagai pengubah air keruh menjadi air bersih siap pakai dengan cara menguapkan dengan memanfaatkan energi panas matahari. Dalam pengujian destilator menggunakan 5 variasi sudut reflektor 55°,58°,60°,62°,65°. Sudut reflektor memiliki pengaruh terhadap unjuk kerja destilator surya tipe wick sollar still dimana semakin besar sudut reflektor maka unjuk kerja nya semakin baik. Destilator surya tipe wick sollar still yang memiliki unjuk kerja terbaik terdapat pada sudut reflektor 65° dimana diperoleh energi penguapan yang paling tinggi sebesar 37,48 watt. Kemudian diperoleh energi pengembunan yang paling tinggi sebesar 37,48 watt. Lalu diperoleh laju destilasi yang paling tinggi sebesar 0,0000158 kg⁄s. Kemudian diperoleh efisiensi produk yang paling tinggi sebesar 8%. Kemudian diperoleh efisiensi sistem destilasi yang paling tinggi sebesar 10,4% dan diperoleh kuantitas air destilasi yang paling tinggi sebesar 400 ml.
Analysis of Wind Power Potential in Samiang Bay, Kotabaru, South Kalimantan Fahrur Aslami; Elysa Nensy Irawan; Mohammad Muntaha; Suyatno; Mochamad Sahal
Journal of Renewable Energy and Mechanics Vol. 6 No. 01 (2023): REM VOL 6 NO 01 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.10763

Abstract

This research was conducted to determine the potential for wind power from the Tamiang Bay area, Kotabaru, South Kalimantan. This study uses data on the average daily wind speed in Tamiang Bay with latitude -4.058883°, longitude 116.050259° obtained from the European Center for Medium-Range Weather Forecasts (ECMWF). Based on the analysis that has been done, the average daily wind speed in Tamiang Bay is 4 m/s for a height of 10 m and 5.98 m/s for a height of 50 m. Through the assumption that using a Gamesa G114-2.5 MW wind turbine with a tower height of 80 m, in one year, the Tamiang Bay area has the potential to produce 2646.58 MWh of wind power. Thus, the Tamiang Bay area is said to be very potential for wind power development.
Analysis of Fluid Flow Characteristics Across the Darrieus Turbine in Irrigation Channels: ANALISA KARAKTERISTIK ALIRAN FLUIDA MELINTASI TURBIN DARRIEUS PADA SALURAN IRIGASI Pratilastiarso , Joke; Diana, Lohdy; Rhahida Arini , Nu; Hilmi Kurniawan, Faris; Fhudoli Putra, Firdaus
Journal of Renewable Energy and Mechanics Vol. 6 No. 01 (2023): REM VOL 6 NO 01 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.10905

Abstract

This study simulated the characteristics of the fluid flow that passes through the Darrieus turbine before installation and testing were carried out. The purpose of knowing the flow characteristics can determine the profile and position of the maximum speed so that the design and placement of the turbine can be improved. The research method was carried out using dynamic fluid computational simulations in three-dimensional form with steady state conditions, discretization using second-order, with convergent conditions when it reached 10-6. The simulation results show that the position of the flow above the turbine had the lowest value because the fluid flowed relatively without disturbance which caused the velocity to had a value almost the same as the incoming fluid velocity. The fluid velocity increased when it was in line 2 and line 3 or across the turbine. This was due to the turbulence generated by the rotation of the turbine. While the speed on line 4 or below the turbine had a lower value than line 2 and line 3. This was due to the position below the turbine so that the turbine rotation did not have an impact on speed. At the four line positions the velocity increased at Y=0.7 m or when the fluid hits the turbine. This increase in fluid velocity was expected to turn the turbine. The results also included the flow distribution in the form of a streamline in several positions where the flow that was in contact with the channel wall had a low velocity value due to friction with the wall.
Effect of Quenching Medium and Tempering Temperature on Microstructure and Hardness of JIS SUP 9 Steel: Pengaruh Media Pendingin dan Temperatur Tempering pada Mikrostruktur dan Kekerasan Baja JIS SUP 9 Harmaji, Andrie; Korda, Akhmad Ardian; Ramadhan, Rama; Pambudi, Satrio
Journal of Renewable Energy and Mechanics Vol. 6 No. 01 (2023): REM VOL 6 NO 01 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.10973

Abstract

JIS SUP 9 steel is one of the materials commonly used for suspension components in motorized vehicles with medium carbon steel base material. It must have good hardness and toughness so that failure does not occur during operational. This research was conducted to increase the hardness of JIS SUP 9 Steel through a heat treatment and various quenching media. The heat treatment was carried out with 830-880ºC temperature with a holding time of 7 minutes then cooled using water and oil. After treatment, tempering was carried out with a holding time of 7 minutes and then cooled in room temperature. Hardness testing was carried out using Microhardness Vickers and then the microstructure was observed using an Olympus Metallurgical Microscope. The results show that heat treatment followed by rapid cooling increases the initial hardness of JIS SUP 9 (229 VHN) steel. The decrease in hardness after the tempering process will be higher with increasing tempering temperature. The results of the microstructure of the sample without heat treatment showed pearlite and ferrite phases. After heat treatment, tempered martensite, residual austenite and carbide phases appear. It can be concluded that changes in the microstructure affect the hardness of JIS SUP 9 steel.
The Effect of Silica Sand Size on Mechanical Properties, Permeability and Proppant Microstructure Martaheru, Nover; Dedikarni; Aldio, Rieza Zulrian; Yulianto, Dody; Hastuti, Kurnia
Journal of Renewable Energy and Mechanics Vol. 6 No. 01 (2023): REM VOL 6 NO 01 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.11274

Abstract

Pellet silika merupakan produk teknologi keramik komposit berbahan penguat pasir silika yang diaplikasikan dalam industri minyak dan gas sebagai proppant (pasir frank) maupun sebagai filter air dan industri perminyakan. Penelitian ini bertujuan untuk mendapatkan pengaruh ukuran pasir silika terhadap kekuatan tekan, permeabilitas dan mikrostruktur. Pada penelitian ini, ukuran pasir silika yang dipilih ukuran pasir silika halus yaitu (200 mesh) dan pasir silika kasar yaitu (20 mesh) dan diikat oleh polyethylene glycol (PEG) 400. Hasil uji kekuatan tekan terendah didapat pada sampel I yaitu 33,24 MPa sedangkan kekuatan tekan tertinggi pada sampel III yaitu sebesar 34,05 MPa. Karena semakin banyaknya ukuran butir pellet silika halus mampu memberikan ikatan interfacial pada polyethylene glycol (PEG) 400, dengan ukuran diameter lebih kecil akan memudahkan terjadi ikatan pada matriks sehingga meningkatkan nilai kekuatan tekan. Namun, uji permeabilitas berbanding terbalik pada kekuatan tekan dimana nilai permeabilitas tertinggi didapat pada sampel I yaitu 29,93 mD, sedangkan nilai permeabilitas terendah pada sampel III yaitu sebesar 23,35 mD. Hal ini karena adanya hubungan ukuran pasir silika halus yang berlawanan arah dengan ukuran pasir silika kasar. Artinya, apabila ukuran butir pasir silika halus naik dan ukuran butir silika kasar turun maka nilai permeabilitas turun. Hasil pengamatan mikrostruktur pada sampel I terlihat lebih sedikit rongga atau porosity dan membuat suatu ikatan interfacial yang lebih kuat. Karena adanya ukuran butir pasir silika halus lebih dominan banyak dari pada ukuran butir pasir silika kasar serta dibantu oleh pengikat berupa polyethylene glycol (PEG) 400.
Vibration Analysis of Fire Pump of PEM Akamigas Cepu: A Case Study Novianto, Hernawan; Sujono
Journal of Renewable Energy and Mechanics Vol. 6 No. 02 (2023): REM VOL 6 NO 02 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.11972

Abstract

Fire pump is a pump that is used to move water from the firewater reservoir to the location of the fire. If there is damage to this pump, the fire that occurs cannot be resolved quickly so that the impact of damage caused by fire becomes more widespread. Various problems can occur in the operation of the pump, one of which is damage to the bearings and shaft, noise occurs, decreased capacity, and even a decrease in pump efficiency. So to prevent the risk of greater damage and minimize losses in terms of cost and time, it is necessary to carry out maintenance. One of the efforts to detect damage to the pump is by vibration analysis, where from the vibration characteristics that occur, the type of damage can be determined. The purpose of this study was to determine the vibration characteristics that occur in the PEM Akamigas Cepu fire pump, by monitoring conditional vibrations using a vibration analyzer. The method is to attach the transducer to a predetermined location to determine the vibration spectrum that occurs in the axial, radial and tangential directions, then analyze the type of damage so that appropriate maintenance actions can be taken. As a result, this pump is indicated to be experiencing extreme looseness or bearing clearance problems at the pump drive end and pump non drive end as well as experiencing moderate pump imbalance, so it needs to be repaired immediately to avoid more serious damage.
Design & Development of a Screw Conveyor-Based Soybean Washing Machine for Tempeh Production Fachri, Zoel; Rouhillah; Alwathani, Muharrir
Journal of Renewable Energy and Mechanics Vol. 6 No. 01 (2023): REM VOL 6 NO 01 2023
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2023.12053

Abstract

Soybeans are one of the main ingredients for making tempeh. Most of the tempeh production businesses still use the traditional system of washing soybeans. Washing soybeans is still done manually using a washing drum filled with water and stirred by hand, thus draining the workforce. In the process of washing soybeans, there is still direct contact with parts of the human body, resulting in unhygienic soybeans. From these problems, the solution is to make a machine that can wash soybeans in tempeh production which aims to facilitate washing soybeans and produce clean and hygienic soybeans. The soybean washing machine process uses a screw conveyor system with an AC motor 1 phase 1 HP 1420 Rpm as a driving force and a DC 12 V 25 W water pump to drain water into the watering canal. The machine can wash 5 kg of soybeans for 10 seconds, and produces a motor rotation of 271.2 Rpm, voltage 229 V, current 2.58 A to produce clean and hygienic soybeans.

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