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Yunita Djamalu
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Journal of Energy and Mechanical Engineering
Published by Universitas Nahdlatul Ulama Gorontalo
ISSN : 30309867     EISSN : 30465850     DOI : 10.62299
Core Subject :
Menerima artikel hasil penelitian dan review. Jurnal ini menjadi wadah untuk menuangkan gagasan baru serta sarana presentasi di bidang sains yang mendukung pemahaman lebih baik mengenai permasalahan dan isu-isu dalam sains dan teknologi terapan, khususnya terkait: energi baru dan terbarukan (emisi dan pembakaran, bahan bakar dan pelumas, perpindahan massa dan panas, mesin pompa kalor, teknik termal dan fluida, komputasi energi, teknik pembangkit listrik, energi skala nano dan piko, material energi, serta topik lain seputar teknik konversi energi); teknologi pengelasan dan pengecoran, material suhu tinggi, material komposit, nanomaterial, komputasi material, teknologi korosi, teknologi pengujian tanpa merusak (NDT), material cerdas, serta topik lain seputar material dan metalurgi; manajemen teknik, teknologi perkakas dan pemesinan, material perkakas, CNC dan komputasi manufaktur, sistem manufaktur, teknologi pemrosesan material terkini, mikropemesinan, metrologi, serta topik lain seputar manufaktur dan ilmu mekanika lainnya.
Arjuna Subject : -
Articles 31 Documents
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PROTOTYPE PENGERING EFEK RUMAH KACA TYPE HYBRID Ismail Hantai; Burhan Liputo
Journal of Energy and Mechanical Engineering Vol. 1 No. 1 (2023): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.vi.1

Abstract

Seeing the increasing production of corn, it is necessary to provide a dryer using solar energy sources with the concept of a greenhouse effect to improve the quality of corn in Gorontalo. This research aims to design a prototype hybrid-type greenhouse effect dryer with four ventilation chimneys and calculate the corn drying rate using a hybrid-type greenhouse effect dryer with four ventilation chimneys. The method used is analytical and experimental design. The results obtained from this research are the highest shelf temperature, namely on shelf 1 with a temperature of 54 ºc, the final water content produced is 13.2% on shelf 1 and 13.5% on shelf 2, the temperature in the environment can relatively change every day, the type of stone used is river stone where the stone shelf functions as a heat storage device at the bottom of the shelf so that the rate of heat reduction on shelf 2 becomes slower.
PERANCANGAN DAN MODIFIKASI PISAU SABIT PADA MESIN PENCACAH SAMPAH ORGANIK Jikri Utalinggi; Yunita Djamalu; Riandi Badu
Journal of Energy and Mechanical Engineering Vol. 1 No. 1 (2023): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.vi.2

Abstract

This organic waste chopper is a tool that destroys organic materials such as leaves, grass, trims, tree branches, and tree fronds by chopping them into small pieces. The design process was done by creating a shredding knife design, a stirrer system, and a filtering process. The Design chosen from the existing literature was one with the simplest method that was easy to make, cheap, and practical when operated. This research aimed to increase the number of crescent blades on the machine organic waste chopper to make it more optimal, Design and calculate the chopper machine transmission system, and Calculate the capacity of the chopper machine. In this research, the method used is quantitative with a literature study approach and making observations about organic waste chopping equipment. The crusher, chopper, and stirrer are made in the shape of a sickle with eight blades and are driven automatically via a dynamo with a simple rotating transmission system. The measuring instruments used in the research were a digital thermometer and a stopwatch. The electric motor (dynamo) used when testing the tool is 1 HP, 1400 rpm. The test was carried out 3 (three) times with a waste weight of 1000 grams each and resulted in an average chopping time of 20.3 seconds with an average chopping size of 1.53 cm. The transmission system components are the electric motor, pulley, v-belt, transmission shaft, bearings, and pins. The results of the transmission system calculations are: pully speed 5,4 , number of v-belt revolutions 4,568 reps, belt life 108.98 working hours, tension on the shaft 1747.15 l , Shear stress on the peg 493 .5 , the compression stress at the pegs is 986.9 , and the bearing life is 1.128 ×  hours. The chopping capacity of the trial results is 2.95 ..
ANALISIS KINERJA SISTEM TURBIN PEMBANGKIT LISTRIKMINI HIDRO (PLTM) TALUDA’A KABUPATEN BONE BOLANGO GORONTALO Muhamad Adi Sukur; Yunita Djamalu
Journal of Energy and Mechanical Engineering Vol. 1 No. 1 (2023): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.vi.3

Abstract

The federal government is relentlessly pushing the shift away from fossil fuels and toward renewable energy sources. The Mini Hydro Power Plant (PLTM) is an example of a renewable energy source. The kinetic energy of falling water is harnessed using the PLTM process. The greater the height of a waterfall, the more electricity may be generated from the water's potential energy. PLTM Taluda'a is a PLTM in Gotontalo Province that can produce up to a combined 2 x 1200 Kw. It has been running its refinery for the last 13 years. The purpose of this research was to analyze the relationship between the generator's output and two critical factors (penstock and guidevane). The research method was descriptively and quantitatively based on field operation data. The analysis results show that changing the management of the water fluid pressure in the penstock by 1% can reduce the generator powerby 8%. While the influence of generator power as an effect of changing the Guidavane openingis 81.5%, a decrease in generator power is obtained by 5.64%
MINI SURYA KOLEKTOR TYPE HYBRID: MINI SURYA KOLEKTOR TYPE HYBRID Zulpan Humalidu; Romi Djafar; Abd Rasid Salim
Journal of Energy and Mechanical Engineering Vol. 1 No. 1 (2023): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.vi.4

Abstract

Drying fish is the oldest method of preserving fish, this is done using blowing wind and direct sunlight. In principle, drying is a way of preserving fish by reducing the water content in the fish's body as much as possible so that bacterial activities are inhibited and, if possible, kill the bacteria. Fish bodies contain 56% - 80% water. If the water content is reduced, bacteria experience difficulties in their metabolism, namely in dissolving food. At a water content of 40%, bacteria can no longer be active, some have even died, but the spores are still alive. Salted fish is a food ingredient made from fish meat that is preserved by adding a lot of salt. With this preservation method, fish meat which usually rots in a short time can be stored at room temperature for months, although it usually has to be tightly closed. In principle, the drying process is the process of reducing the water content in fish. The basis of drying is the evaporation of water into the air due to the difference in water vapor content between the air and the material being dried. In this case, the water vapor content in the air is less or the air has a low relative humidity so that evaporation occurs.
PERANCANGAN POMPA AIR TANPA MESIN Yusrin Alazia; Romi Djafar; Ria Selfiyani
Journal of Energy and Mechanical Engineering Vol. 1 No. 1 (2023): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.vi.6

Abstract

  In general, a water pump's main source of power is to use electrical energy to transport fluid to a certain place. However, electrical energy is the main problem in rural areas to power the pump. Therefore, technological innovation is needed so that the pump can still be used even though it does not have an electricity source.The main objective of the research is to find out and identify the minimum water availability needed to run PATM. This research was carried out on the South Dulamayo river using PATM made of galvanized steel construction material in the form of a pipe with a diameter of 3 inches and a length of 1.4 meters. The method used is by changing the damper opening by 100%, 50% and 25%.Based on the testing, the results of the research Machine Testing are obtained. The water pump without an engine produces a quantity of water of 3 liters for 100% opening and the lowest is 1 liter for 25% opening. The flow rate (Q) produced is respectively 9.1 m2 for 100% opening. %, and 6.8 m2 for 50% openings and the lowest is 4.5 m2 for 25% openings. The time obtained to get the fastest amount of flow is 60 seconds and the longest is 120 seconds.
PENGARUH PERUBAHAN TERMINAL TEMPERATUR DIFFERENCE (TTD) DAN DARIN COOLER (DCA) FEED WATER HEATER TERHADAP PERFORMA PLTU MENGGUNAKAN SIMULASI CYCLE TEMPO 5.1 Yunita Djamalu; Romi Djafar; Syaiful Umela; Abd Rasyid Salim
Journal of Energy and Mechanical Engineering Vol. 1 No. 2 (2024): Journal of Energy and Mechanical Engineering (Juni)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.vi.9

Abstract

Feedwater heater (FWH) performance can be monitored periodically by reviewing the terminal temperature difference (TTD) and drain cooler approach (DCA) values. Monitoring this value by comparing the actual condition and the value resulting from commissioning.  The lower the TTD and DCA values, the better the work effectiveness of FWH. In general, the TTD value ranges between 2.8 ºC to -2.8 ºC while the DCA is between 5.6 ºC to 1 ºC. In this research, modeling was carried out using a cycle tempo simulation of the Molotabu Gorontalo 2 x 12.5 MW PLTU generator to review how much influence the changes in TTD and DCA values ​​of the low feedwater and hight feedwater heaters have. The variations used respectively are TTD with a value (°C) of 2.8; 2; 0; -2 and -2.8 while DCA) respectively (°C) 5.6; 5; 4 ; 3; 2 and 1. The aim of the research is to find out how heat transfer occurs in the two FWHs resulting from modeling and its effect on the Net Plant Hear Rate (NPHR) and the efficiency of the PLTU system. Based on the simulation results obtained using variations of TTD and DCA on the low feedwater heater, the heat transfer in the heater is 144830 kW and 1761.48 kW. Meanwhile, the high feedwater heater produces heat transfer to the heater of 3400.13 kW and 3795.24 kW. As for energy balance, the lowest gross power was 26.32% and the highest was 26.5%. Based on the analysis results, the highest NPHR value was 21634.24 kg/kJ/h, getting an efficiency value of 25.87%. while the lowest NPHR is 25130.43 kg/kJ/h low NPHR produces the highest efficiency of 26%.
ANALISIS PERAN KONSULTAN PENGAWAS TERHADAP KEBERHASILAN PROYEK Arfan Usman Sumaga; Arfan Utiarahman; Muh Taufik R. Abdullah
Journal of Energy and Mechanical Engineering Vol. 1 No. 2 (2024): Journal of Energy and Mechanical Engineering (Juni)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

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Abstract

  In construction projects, there are several obstacles in the implementation of construction projects. These obstacles can affect the success of the project. Therefore it is necessary to conduct an analysis related to the role of the supervisory consultant on the success of the project. This analysis aims to determine how the performance of the supervisory consultant can affect the success of the project. The method used in this study was to distribute questionnaires to respondents and then test the data using the Statistical Products and Services Solutions (SPSS) application. Based on the Pearson correlation test, the influence of the supervisory consultant on the success of the project showed a correlation coefficient of 0.562. This figure shows a significant positive relationship between the supervisory consultant variable and project success. The correlation coefficient number is positive so that the relationship between the variables is unidirectional, meaning that the higher the role of the supervisory consultant, the greater the success of the project.
MANAJEMEN PEMELIHARAAN PERMESINAN TAMBAK DENGAN METODE FMEA DI PT. PULAU MAS KHATULISTIWA PROVINSI KALIMANTAN BARAT Izhary Siregar; Fahmi Muhammad Hafidz
Journal of Energy and Mechanical Engineering Vol. 2 No. 1 (2024): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

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Abstract

Industri budidaya perikanan saat ini mengalami perkembangan cepat dengan dukungan teknologi peralatan dan permesinan yang memadai. Penggunaan perangkat permesinan ini tentunya harus diselaraskan dengan sistem maintenance yang baik. Jika perusahaan melakukan perawatan sebelum terjadinya kerusakan atau perawatan pencegahan, maka hal ini dapat menekan biaya operasional menjadi lebih kecil. Untuk itu, penelitian ini akan menganalisa sistem perawatan peralatan dan permesinan yang digunakan di PT. Pulau Mas Khatulistiwa. Metode yang digunakan dalam penelitian ini adalah metode Failure Mode and Effect Analysis (FMEA) dengan mengukur variabel severity, occurrence, dan detection pada 3 (tiga) peralatan yaitu kincir air tambak, pompa celup dan genset. Pelaksanaan survei lapangan juga dilakukan dalam rangka mengamati langsung terkait cara kerja dan jam operasional permesinan yang digunakan pada kegiatan budidaya udang di PT. Pulau Mas Khatulistiwa tersebut. Pengukuran variabel severity, occurrence, dan detection serta menghitung RPN dilakukan untuk dapat memprioritaskan tindakan perbaikan berdasarkan dampak potensial dari kegagalan dan efektivitas control. Dari hasil penelitian yang dilakukan, Genset memiliki nilai RPN tertinggi yaitu 144 dengan failure mode pada kebocoran oli. Hal ini menunjukkan bahwa penggunaan Genset ditambak butuh penjadwalan untuk kegiatan perawatan mesin yang intensif dan menjadi prioritas tindakan perbaikan berdasarkan dampak potensial pemadaman listrik serta efektivitas kontrol yang ada.
EVALUASI PENYEBAB KERUSAKAN MOTOR LISTRIK KINCIR AIR TAMBAK DI PT. PYRAMIDE PARAMOUNT INDONESIA izhary Siregar; Galang Andreansah
Journal of Energy and Mechanical Engineering Vol. 2 No. 1 (2024): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

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Abstract

The electric motor is an important component in supporting the vannamei shrimp cultivation process. However, during the cultivation process, the waterwheel experienced a lot of damage caused by several factors. Evaluation of electric motors is very important to identify damage, causes, and determine appropriate repairs for damaged electric motor components. The purpose of evaluating this electric motor is to determine the level of efficiency of the electric motor. This research was carried out by evaluating 3-phase electric motors with power less than 1 hp with the results that the problems frequently experienced were damage to the bearings and copper windings in the stator caused by excessive loads received on the electric motor. The results of this research state that improvements using the rewinding method are the most appropriate because they can maintain the level of efficiency of electric motors and save more costs.
PERANCANGAN FILTER AIR LAUT MENJADI AIR TAWAR MENGGUNAKAN ENERGI SURYA MODEL PIRAMIDA DENGAN METODE REVERSE OSMOSIS Alpandi Dama; Yunita Djamalu; Romi Djafar; Syaiful Umela; Rian Kadir
Journal of Energy and Mechanical Engineering Vol. 2 No. 1 (2024): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

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Abstract

ABSTRACT The lack of clean water is a serious problem that needs to find a solution, namely by utilizing sea water which is available in large quantities to produce clean and salty water. The best solution to this problem is seawater desalination. The human reproductive system is not a new technology. Therefore, in the research explaining the design of a sea water filter into fresh water using pyramid model solar energy using the reverse osmosis method, this research carried out comprehensive testing of the quality of fresh water produced by the distillation equipment, including to determine pH levels, conductivity, turbidity, TDS, color, smell, and taste. Meanwhile, previous research did not test the quality of the water produced. The research results obtained from testing the parameters of odor, taste and color in seawater samples showed that there was no odor, no taste and no color in the distilled water samples. Keywords: Design, Sea Water, Reverse Osmosis

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