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Jurnal Rekayasa Material, Manufaktur & Energi
Published by Universitas Muhammadiyah Sumatera Utara
ISSN : 26227398     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Aerospace Engineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering
Jurnal Rekayasa Material, Manufaktur & Energi, yang diterbitkan oleh Fakultas Teknik, Program Studi Teknik Mesin, Universitas Muhammadiyah Sumatera Utara (UMSU), Medan, Sumatera Utara, Indonesia, Jurnal Rekayasa Material, Manufaktur & Energi menerima artikel ilmiah hasil-hasil penelitian, dan eksperimen, yang mencakup pada bidang Rekayasa Material, Manufaktur dan Energi, Mesin, dan ilmu yang relevan pada sektor terkait.
Arjuna Subject : -
Articles 230 Documents
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Investigasi Peleburan dan Pembekuan Phasa Change Material (PCM) Paraffin Wax Sebagai Thermal Energy Storage Pada Pipa Handoko, R; Suwandi, A; Siregar, Chandra A; Siregar, Ahmad Marabdi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16336

Abstract

Phase change materials (PCM) are materials that can change phase from solid to liquid and vice versa from water to solid. PCM is the most efficient material for storing heat energy in the form of latent heat. This study aims to investigate melting and freezing of PCM types of paraffin wax in pipes. The investigation was carried out in 3 experiments with heat source temperatures of 90 0C, 85 0C and 80 0C. To facilitate investigation, paraffin wax is placed in a transparent tube. During the smelting process, observations were made for 600 minutes, and data recording and shooting were carried out every 60 minutes. The result is that the melting of paraffin wax starts from the top of the heat source side. The higher temperature paraffin wax moves upwards and the lower one moves downwards. On freezing, also found the same thing. The flow pattern is affected by the temperature of the paraffin wax itself. In addition, it can also be concluded that the higher the temperature of paraffin wax, the higher its ability to store heat energy.
Analisis Energi Pada Alat Desalinasi Tenaga Surya Jandri Fan HT Saragi; Eka Putra Dairi Boangmanalu; Angga Bahri Pratama; Franklin Taruyun Hudeardo Sinaga; Al Qadry; Wawan Septiawan Damanik
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.15169

Abstract

In recent times, many studies have been carried out on desalination systems in areas that have difficulty in obtaining clean water sources. Desalination is a method used to distill salt water or brackish water into clean water using solar power as its energy source. This desalination process is a practical alternative that can be used to offer renewable energy sources that are used to produce clean water. To perform energy analysis, the first law of thermodynamics is used as a basis. This study aims to obtain the results of the amount of energy obtained from the solar desalination system and to determine the factors that greatly affect the amount of energy obtained from the system for evaporating water. The method used in this research is an experiment by testing a solar desalination device for eight days. The results show that the highest thermal energy produced is 8.98 kWh and the lowest is 1.56 kWh, and the factors that influence the amount of thermal energy are the heat transfer coefficient and the amount of distilled water produced by the system.
Rancang Bangun ALPENLIBE (Alat Pemanen Energi Listrik Berbasis Piezoelektrik) Sebagai Upaya Mewujudkan Energi Terbarukan Listijorini, Erny; Susilo, Sidik; Adhiwindoro, Akhmad; Febrianto, Ilham; Shihab, Muhammad Alwi; Dwiyoga, Muhammad Ashari; Ananda, Rafi Rizqi
Rekayasa Material, Manufaktur dan Energi Vol 7, No 1: Januari 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i1.16365

Abstract

Utilizing alternative energy as an effort to use energy needs to be done. One is energy harvesting, which is capturing minute amounts of energy from one or more surrounding energy sources, collecting and storing them for later use. There are examples of uses in harvesting energy from vibrations, which are carried out using piezoelectricity as a converter into electrical energy. A piezoelectric-based electrical energy harvesting device has been designed using a cantilever method from mechanical pressure from humans climbing stairs. This research uses an experimental method where there are variations in the load given by humans of 55 Kg, 65 Kg, and 75 Kg to provide a force on an energy harvester that has four piezoelectric circuits installed, which are installed in series and parallel totaling 38 piezoelectric units. , where the four circuits have a number of piezoelectrics of 10, 8, 10, and 8 piezoelectrics on each side. The resulting voltage will later be rectified using a rectifier bridge until it is temporarily stored in the capacitor. As obtained from the calculation results, the voltage values for each load are 7.762 mV, 11.103 mV, and 17.55 mV, respectively.
Pemodelan Inspeksi Kerusakan Ban Mobil Menggunakan Convolutional Neural Network (CNN) Leni, Desmarita; Yermadona, Halga
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16198

Abstract

Tire damage inspection can be categorized as part of vehicle maintenance with the aim of ensuring that the tire condition is in good condition. Visual inspection using human observation has limitations, making it not always accurate and can result in errors in determining tire suitability. This research designs a machine learning modeling using Convolutional Neural Network (CNN) to detect damage to mobile tires. The parameters used in the CNN model training are the Adam optimizer, learning rate 0.0001, batch size 16, and using the Early Stopping function. In this study, the CNN modeling was tested with two treatments, namely using a dataset without data augmentation and a dataset using data augmentation, then the results were evaluated using a confusion matrix. The results showed that data augmentation treatment can significantly improve model performance, with an increase in accuracy of 20%, precision of 14%, recall of 22%, and f1-score of 19% compared to treatment without data augmentation
Pengaruh Perlakuan Ekstraksi Limbah Ampas Kopi terhadap Sifat Mekanis Komposit Bermatriks Polipropilena Melyna, Ella; Syiar, Raizy Ziman
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.14920

Abstract

The rapid development of technology and science produces renewable versatile ideas and products. This study examines the use of coffee grounds as filler for polymer composites. The polymer used is a polypropylene thermoplastic polymer. The use of spent coffee grounds can reduce environmental waste. The oil content in coffee grounds is hydrophobic, while the polypropylene matrix itself is hydrophilic. The purpose of extracting coffee grounds is to remove the oil content in coffee grounds, with reduced oil and water content, the adhesion between the polypropylene surface and the coffee grounds will be better. The manufacture of polymer composites uses a Manual Forming Machine (MFM) with a variety of additions of extracted coffee grounds to polypropylene. The results of the study stated that the extraction treatment on coffee grounds increased the values of tensile strength, impact strength, and flow rate compared to the addition of coffee grounds without extraction, but variations in the addition of coffee grounds decreased the values of tensile strength, impact strength and flow rate. The highest variation in the polypropylene matrix composite with the addition of 5% coffee grounds waste extraction resulted in a tensile strength of 20.22 MPa, an impact strength of 2.398 kJ/m², and a flow rate value of 8.48 g/10 minutes. The extraction process removes the oil content. This is evidenced by the loss of ester groups in the functional group test results of the extracted coffee grounds waste.
Analisis Pengaturan Jarak Cahaya Lampu Halogen Pada Rancang Bangun Solar Test Simulator ., Cholish; Faza, Sharfina; Hajar, Ibnu; ., zumhari; Azis, Abdul; ., abdullah
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16899

Abstract

This study focuses on the use of halogen lamps in the design of a Solar Test Simulator to simulate sunlight conditions in testing solar panels. Halogen lamps are chosen as the light source due to their ability to approximate the solar spectrum, enabling testing of solar cells in a controlled laboratory environment. However, precise adjustment of halogen lamp light is crucial to ensure the accuracy and consistency of test results. The design of the Solar Test Simulator for Solar Panels involves configuring the placement of solar panels so that the designed tool can provide simulation based on actual solar panel measurements. The performance of solar panels is displayed through a monitor placed in the design, providing comprehensive information about the solar panels. Limitations in the placement of solar panels do not provide reference regarding measurement conditions based on the angle of incoming sunlight. Therefore, further design is needed concerning the positioning of solar panels during measurements. The development in this tool's design includes adjustments to the height of the halogen lamp from the solar panel, specifically at heights of 0.328m, 0.366m, and 0.405m.
Analisis Kinerja Turbin Hidrokinetik Dengan Selubung Diffuser Pada Kondisi Yaw Misalignment Berdasarkan Variasi Kecepatan Aliran Air ., Nasrullah; ., Nofriadi; ., Nasirwan; Leni, Desmarita; Kesuma, Dytchia Septi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16190

Abstract

Yaw Misalignment condition has detrimental effects on the performance and efficiency of hydrokinetic turbines. This phenomenon occurs when the direction of water flow hitting the turbine blades is not aligned with the turbine's movement direction. In this research, an analysis is conducted on the performance of a hydrokinetic turbine equipped with a diffuser shroud under Yaw Misalignment conditions, considering variations in water flow velocity. The dataset used in this study consists of water flow velocity data, yaw angles, tip speed ratio (TSR), and power coefficient (Cp) of a 19.8 cm diameter horizontal-axis hydrokinetic turbine operating under Yaw Misalignment conditions. Experiments were conducted at three water flow velocity levels: 0.7 m/s, 0.9 m/s, and 1.1 m/s. Additionally, yaw angle variations were applied ranging from 0° to 25° at 5° intervals. Data analysis involved the application of Pearson correlation analysis and descriptive statistical analysis to identify the maximum Cp values. The analysis results indicate that the highest maximum Cp value is 0.711, with a tip speed ratio (TSR) of 4.33, achieved at a yaw angle of 0° and a water flow velocity of 0.9 m/s. This indicates that under these conditions, the turbine reaches its peak performance in converting water flow energy into mechanical power.
Peran Minyak Kayu Putih Terhadap Karakteristik Pembakaran Minyak Kapuk Sebagai Bahan Bakar Alternatif Riupassa, Helen
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.15818

Abstract

The study conducted experimental investigations on the burning rate of crude kapuk oil droplets by incorporating bio-additives derived from eucalyptus oil. The bio-additive concentration of eucalyptus oil added to the kapuk oil was 100 ppm and 300 ppm, respectively. The droplet combustion method was chosen to maximize the contact area between the air and fuel, thereby enhancing the reactivity of fuel molecules.The findings revealed that the cineol compounds present in eucalyptus oil exhibit aromatic properties and possess an asymmetrical carbon chain geometry. This characteristic has the potential to facilitate effective collisions among fuel molecules, thereby promoting combustion. This was evident from the observed increase in the burning rate. Furthermore, the observations indicated that the highest burning rate was achieved when both bio-additives were 300 ppm.These results highlight the positive impact of incorporating eucalyptus oil as a bio-additive in crude kapuk oil. The aromatic nature and unique geometric structure of cineol compounds contribute to the fuel's increased reactivity and enhanced combustion performance. By utilizing bio-additives, such as eucalyptus oil, at an optimal concentration, it is possible to further improve kapuk oil's burning characteristics and overall performance as a biofuel.These findings provide valuable insights into the development of more efficient and sustainable alternative energy sources. By understanding the molecular aspects and effects of bio-additives, researchers can continue to explore and optimize the utilization of biofuels, such as crude kapuk oil, for a greener and more environmentally friendly energy future.
Perancangan Aplikasi Berbasis Web Sebagai Alat Pendukung Keputusan Dalam Memilih Ac Hemat Energi ., Maimuzar; Sumiati, Ruzita; ., Haris; Leni, Desmarita; Dwiharzandis, Aggrivina
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16255

Abstract

The increase in global energy demand has driven the need for efficient solutions in selecting energy-efficient air conditioners (ACs). This research focuses on designing a web-based application as a decision support tool for choosing energy-efficient ACs. Energy-efficient labeled AC data is obtained from the Directorate General of New and Renewable Energy and Energy Conservation (EBTKE) website. This database is processed according to the system's requirements, where each AC brand is evenly represented to prevent dominance by a few brands. There are 11 different AC brands in this dataset, and each brand has 10 data samples. The web-based application is developed using the Python programming language with the Streamlit framework. This application allows users to compare various AC brands by considering power, annual energy consumption, efficiency value, and electricity cost. In the application design, users can select AC brands according to their needs, set the operating duration, choose the AC efficiency level, and select the inverter AC type. The application presents comparisons in the form of bar charts, making it easy for users to understand the differences in AC characteristics. The average results from the efficiency comparison of each AC brand reveal that Daikin achieves the highest efficiency at 16.36 Energy Efficiency Ratio (EER), while the GREE brand has the lowest efficiency at 5.83 EER. This application can assist consumers and industrial AC stakeholders in making decisions to choose energy-efficient ACs according to their needs.
Analisis Penyebab dan Solusi Masalah Durasi Overhaul Dump Truck Komatsu HD 785-7 Tidak Sesuai Rencana Latif, Akhmad Abdul; Nurhadi, Nurhadi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.15916

Abstract

Dump Truck is one of the heavy equipment that functions to transport materials such as soil and coal. For this machine to always be in the best condition, periodic maintenance is required, one of which is overhaul maintenance. There are various types of overhaul work on the Komatsu HD 785-7 dump truck unit. Even though there was good planning before the work started, there were still problems with the duration of the Komatsu HD 785-7 overhaul dump truck work which was not in accordance with the initial plan and resulted in the company as a heavy equipment rental service provider losing money. The purpose of this study is to analyze the causes of the duration of work on the Komatsu HD 785-7 dump truck overhaul and provide a solution as a recommendation or reference for the company. The method used is descriptive quantitative method. Descriptive quantitative methods are used to understand an event regarding the duration of an overhaul that is not according to plan in depth, by describing and explaining the characteristics of the incident. Collecting data by interviewing workers, observing in the field, distributing questionnaires and archives of previous overhaul work documents. The results of the study show that the main cause of the duration of work that is not according to plan is the arrival of spare parts or major components not according to schedule, and the addition of work accompanied by the addition of spare parts. The solution provided is to schedule joint inspection work to be carried out earlier with the aim of being able to find out the additional spare parts needed so that the ordering time can be made earlier and the waiting time for spare parts supply can be reduced.

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