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INDONESIA
Journal of Energy, Mechanical, Material and Manufacturing Engineering
Published by Universitas Muhammadiyah Malang
ISSN : 25416332     EISSN : 25484281     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Journal of Energy, Mechanical, Material and Manufacturing Engineering Scientific (JEMMME) is a scientific journal in the area of renewable energy, mechanical engineering, advanced material, dan manufacturing engineering. We are committing to invite academicians and scientiests for sharing ideas, knowledges, and experiences in our online publishing for free of charge. It would be our pleasure to accept your manuscripts submission to our journal site.
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Articles 7 Documents
 1 
Search results for , issue "Vol. 8 No. 2 (2023)" : 7 Documents clear
The Optimization Of Shell And Tube Cycle Recuperator Design In Organic Rankine Geothermal Power Plant Muhammad Rifqi Dwi Septian
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indonesia has the largest geothermal potential in the world by saving 40 percent of the world's geothermal resources. Geothermal energy manifestations in Indonesia are no less than 252 locations spread across Sumatra, Java, Nusa Tenggara, Bali, Sulawesi to Maluku. Indonesia has a total geothermal energy potential of 29 GWe spread throughout Indonesia. Geothermal sources that have low steam quality can be used to generate electricity with the Organic Rankin Cycle (SRO). SRO uses organic fluids which have a low boiling point so they can be used as a heat source. Utilization of SRO as Waste Heat Recovery is an increase in the use of renewable energy in Indonesia. In reducing the performance load of the cycle, the recuperator can be added as a supporting component to the Organic Rankin Cycle. By designing a recuperator the load of heating and cooling components will be lighter so that the efficiency value of the cycle will increase. The aim of this research is to design a recuperator in organic rankin cycle (SRO) by analyzing the cycle using organic fluids R123, n-pentane, and n-butane and to calculate the economic feasibility of designing a recuperator in SRO. This study used a brine temperature of 169.932 oC from a PLTP which produced the highest efficiency in an organic rankine cycle of 14.40% with n-pentane organic working fluid. The recuperator design uses n-pentane working fluid which produces a heat transfer effectiveness value of 23.76%. Heat transfer in the recuperator is influenced by the large cross-sectional area which includes the length of the pipe and the number of pipes designed. The results of the economic feasibility calculations in this study are the NPV > 0 and the long time to return on investment using the payback period (PP) method for 4.83 years. Keywords: Organic Rankine Cycle (SRO), Recuperator, PLTP, brine
Effects of Lumajang sand-bentonite mix on Al-Si casting mechanical properties Edi Widodo; Rendra Dani Firmansyah; Subroto; Iis Siti Aisyah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29093

Abstract

The use of sand for metal molds is often found in various places; this research will focus on the type of sand used, namely sand from Lumajang Regency, which is known to be strong for concrete mixes or the like. So the purpose of this research is to find out how Lumajang sand molds will be used as metal casting molds. Testing will be carried out by making three variations of bentonite mixtures: 10%, 15%, and 20%. Later, after knowing the tensile and compressive strengths of each sand mold, casting will be carried out with three variations. For testing, casting objects will use the dye penetration test method. So that a description of the surface smoothness of the casting objects made from the three molds will be obtained and it will be known which variation is good to know about the sand mold and the appropriate metal casting results. From the results of the research conducted, it shows that the bentonite mixture with a percentage of 20% gets the highest compressive value with a value of 26.3 N/cm2 when compared to other bentonite mixture variations. From the tensile testing results, a high tensile strength value was obtained in the 15% bentonite mixture variation with a value of 0.7 N/cm2. While the results of the dye penetrant test were obtained, the results of the variation of the sand mold mixture with 20% bentonite into a mold produced the smoothest workpiece results with a few red spots caused during testing.
Effects of leading-edge defects of the NACA 0015 airfoil on aerodynamic performance with various Reynolds number Ulfa Hanifah Nurhaliza; James Julian; Fitri Wahyuni; Waridho Iskandar
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29400

Abstract

This study investigates and identifies the effects produced by defect on an airfoil when compared to a smooth airfoil. The defect used in this research is of the surface concaved defect (SDD) type, with a deep defect characterized by a smooth sunken deformation. The opening size used is t*=12%, and the equivalent depth of the defect is h*=3%. Computational methods are being used in this research to analyzing flow of the fluid through the NACA 0015 airfoil, both in smooth and defective airfoil, with various Reynolds Number which are 1.6×106, 2×106, and 2.5×106. Standard k-epsilon model is being used in this research as turbulence model. For the smooth airfoil, stall conditions occur at an AoA of 11º, while for the defective airfoil, they occur at an AoA of 9^° for each Re variation. The average decrease in the Cl/Cd ratio from smooth airfoil to defective airfoil at each AoA for all Re variations is 33%. There is an increase in pressure on the upperside leading edge of defective airfoil for all Re values. Based on the velocity streamlines, vortices can be found at the defect cavity, and the vortex at the defective airfoil seems larger than the smooth airfoil.
Parametric optimization technique for continuous and combinational problems based on simulated annealing algorithm Yosua Heru Irawan; Po Ting Lin
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29556

Abstract

Simulated annealing is an optimization method adapted from the annealing process. The optimization process using simulated annealing method is done by mapping the elements of physical coolant process onto the elements of optimization problem. This method uses local neighborhood search to find solutions, meaning it searches around it for answers itself and takes another solution based on everything around it. The simulated annealing method has been used successfully for the optimization process in the continuous case (Himmelblau’s function) and combinational case (Quadratic Assignment Problem or QAP). Based on the optimization results (global minima) for the Himmelblau's function, the points  and   are obtained with objective function . The optimal solution for the eight departmental arrangements is F, E, A, G for the bottom floor and H, D, C, B for the top floor, this arrangement produces an optimal total cost of 214. The simulated annealing method accepts an uphill move (worse move) by considering the probability, in this way we will not be trapped in the local minima position. These four search space variables  and  determine the performance of the simulated annealing method, we can adjust them according to the optimized case.Simulated annealing is an optimization method adapted from the annealing process. The optimization process using simulated annealing method is done by mapping the elements of physical coolant process onto the elements of optimization problem. This method uses local neighborhood search to find solutions, meaning it searches around it for answers itself and takes another solution based on everything around it. The simulated annealing method has been used successfully for the optimization process in the continuous case (Himmelblau’s function) and combinational case (Quadratic Assignment Problem or QAP). Based on the optimization results (global minima) for the Himmelblau's function, the points  and   are obtained with objective function . The optimal solution for the eight departmental arrangements is F, E, A, G for the bottom floor and H, D, C, B for the top floor, this arrangement produces an optimal total cost of 214. The simulated annealing method accepts an uphill move (worse move) by considering the probability, in this way we will not be trapped in the local minima position. These four search space variables  and  determine the performance of the simulated annealing method, we can adjust them according to the optimized case.
Corrosion rate of anodized AA 7075-T651 on H2SO4 electrolyte and vVoltage variation Moch. Syamsul Ma'arif; Muhammad Noviandari; Rudy Soenoko
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29717

Abstract

Metal materials corrode because of an electrochemical process that damages or destroys them gradually. In addition to chemical reactions, high temperatures, mechanical operations, and rainfall exposure can all lead to corrosion. It is an experimental study with variation of voltage for AA 7075-T651. The voltage variation between 4 and 5 and 6 volts is the independent variable employed in this study. The rate of corrosion and the size of the pores are the dependent variables. One amp of current, thirty millimeters between the anode and cathode, one millimeter of sulfuric acid as the electrolyte concentration, and ten minutes of anodizing time are the controlled variables in this study. Variation in voltage throughout the anodizing process can regulate how quickly corrosion occurs via the oxide layer that is created. The 7075-T651 series aluminum alloy, when subjected to action anodizing at different voltages of 4 volts, 5 volts, and 6 volts, yields pore diameters measuring 0.273 μm, 0.436 μm, and 0.522 μm, respectively, according to SEM picture data.
Utilization of coconut fiber and corn cob waste as noise reducers Amalia Ma'rifatul Maghfiroh; Ardana Putri Farahdiansari
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29880

Abstract

Noise is a very disturbing problem in residential, office, educational, industrial and other environments. Noise can be reduced by using materials that can dampen and absorb sound. The sound dampening materials that are widely used by the public generally use glasswool and rockwool, but they are expensive. The more expensive the price of goods including sound absorbers, the more alternatives are needed by utilizing materials derived from nature which are easy to obtain and cheaper, besides that by utilizing existing natural fibers it can also reduce waste in the surrounding community. One example of utilizing waste from natural fibers is making composites using coconut fiber and corn cobs. Composite materials made from coconut coir fiber and corn cob are alternative sound absorbing materials that are environmentally friendly, easily available and inexpensive. The aim of the research was to obtain an optimum composition ratio to produce composites as environmentally friendly sound absorbing materials, to determine the value of the sound absorption coefficient (α) from the manufacture of coco fiber and corn cob composites as noise dampening materials. From the research results it can be concluded that the sound dampening ability results show varying values ​​for each test specimen. The highest incoming sound/energy is 94.4 dB at a frequency of 500 Hz while the lowest incoming sound/energy is 44.14 dB at a frequency of 125 Hz. Meanwhile, the highest sound/absorbed energy (mean value) was 37.7 dB at a frequency of 750 Hz in sample C, while the lowest sound/absorbed energy was -6.16 dB at a frequency of 4000 Hz in sample A.   Keywords: composites, noise, sound absorbing materials
Comparative analysis of solar panel output power with variations of Heatsink type cooling systems Dwi Yulia Handayani; James Julian; Fitri Wahyuni; Ridwan Daris Naufal
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.30152

Abstract

The heatsink is installed on the back sheet of the solar panel in the form of a fin so that the air under the solar module helps the heatsink perform cooling. Temperature testing uses a thermocouple temperature sensor at several calibrated points, taking volt and current data using a multimeter. The results of this test obtained a deviation comparison value between solar panels without a heat sink and using a heat sink of ±1%. So, the similarity of deviation values from the research is used as a control variable. From all the data that has been taken, using heat sinks on solar panels can reduce excess heat in the solar panel modules. The heat transfer that occurs in this experiment is by conduction and convection. The heatsink's good performance in releasing heat with high power output can be seen at 12.25 because the resulting thermal efficiency is related to the power released at the same time. The thermal efficiency value is 20.88%, and the power increase is 19.31%.

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