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Pengeringan Kopi Arabica Sistim Terintegrasi Penyimpanan Termal Dengan dan Tanpa Desikkan Parulian Siagian; Richard A M Napitupulu; Siwan P Peranginangin
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 1 (2022): Edisi Agustus 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Penelitian ini mengkaji dan meniliai keefektifan pengering surya yg kontiniu dan terintegrasi dengan pengeringan penyimpanan panas dikombinasikan dengan molekuler13 (Na86 [(AlO2)86 (SiO2)106] 264H2O) sebagai penahan kelembapan. Hasil menunjukkan pada kondisi terik matahari, temperature didalam ruang pengering cenderung berbeda antara 42.100C-46.600C dan rata rata 6.700C -11.180C diatas tempratur ambient, rata rata kelembapan 68.94% dengan rata rata kecepatan udara 1.16m/s. Pengeringan konvensional membutuhkan waktu selama 5 hari dengan temperatur maksimum 35.420C pada rata rata kecepatan angin 0.7m/s. Waktu pengeringan dengan menggunakan desikkan dan tanpa menggunakan desikkan adalah 35 jam dimana bobot 8.207.kg pakai desikkan dan bobot 8.370.kg tanpa desikkan dengan kadar air 13%, sementara pengeringan konvensional membutuhkan waktu 120 jam atau 5 hari dengan suhu maksimum 35.420C dan suhu rata rata 29.700C. Mutu aroma kopi oleh tim teaster bahwa yang memakai desikkan cenderung aroma aromatic better dan coklat, caramel serta rasa pahit yang kuat, sementara tanpa desikkan ada rasa pahit agak lemah dan rasa defect

Proses Pack Carburizing Baja Karbon Dengan Arang Kayu dan Arang Tulang Sapi Richard A. M. Napitupulu; Surianto Lumbantobing; Charles SP Manurung
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 9 No 1 (2023)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2023.v09.i01.p02

Karburisasi adalah salah satu proses yang paling banyak dilakukan pada perlakuan pengerasan di daerah permukaan baja. Proses ini selain meningkatkan kadar karbon juga sebagai langkah awal dari proses pengerasan pada permukaan sehingga material baja memiliki kombinasi sifat keras di bagian luar dan tetap ulet di bagian dalam. Penelitian ini dilakukan untuk meningkatkan kadar karbon pada baja dengan sumber karbon yang berasal dari arang kayu dan arang tulang sapi. Pada kondisi awal, spesimen memiliki kekerasan pada bagian diameter terluar 187,909 HV, komposisi karbon sebesar 0,18%C. Spesimen dipanaskan hingga temperatur 9000C dengan variasi waktu penahanan 30, 45 dan 60 menit dan masing-masing variabel diberi sumber karbon dari arang kayu dan arang tulang sapi yang diharapkan dapat berdifusi di permukaan baja. Kekerasan yang paling meningkat adalah pada spesimen dengan waktu penahanan 45 menit dan sumber karbon dari arang kayu dengan angka kekerasan 734,38 HV dan kadar karbon 0,201 % C. Secara umum terjadi peningkatan kekerasan dan kadar karbon akibat adanya difusi atom C yang berasal dari arang, namun juga terdapat adanya penurunan kadar karbon di permukaan yang dapat disebabkan oleh karena waktu penahanan yang berlebih atas dimensi spesimen. Carburizing is one of the most widely used processes in hardening treatments in the steel surface area. This process in addition to increasing the carbon content is also the first step of the surface hardening process so that the steel material has a combination of hard properties on the outside and remains ductile on the inside. This research was conducted to increase the carbon content of steel with carbon sources derived from wood charcoal and beef bone charcoal. In the initial conditions, the specimen has a hardness at the outer diameter of 187.909 HV, the carbon composition is 0.18%C. The specimens were heated to a temperature of 9000C with variations in holding times of 30, 45 and 60 minutes and each variable was given a carbon source from wood charcoal and beef bone charcoal which were expected to diffuse on the steel surface. The most increased hardness was in specimens with a holding time of 45 minutes and carbon source from wood charcoal with a hardness number of 734.38 HV and a carbon content of 0.201 % C. In general, an increase in hardness and carbon content was due to the diffusion of C atoms from charcoal, but there is also a decrease in the carbon content on the surface which can be caused by excessive holding time on the dimensions of the specimen.

Optimization of Nickel Electroplating on Low Carbon Steel for Corrosion Resistance using Immersion Corrosiontest with 3.5% NaCl Parulian Siagian; Richard A.M. Napitupulu; Eko Yohanes Setyawan; Muhammad Fakhri Amadika
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3270

This research studied the corrosion resistance of low carbon steel that has been coated with nickel in NaCl solution by the Immersion Corrosion method with 3.5% NaCl liquid. Coating is done to increase the wear resistance of low carbon steel. The coating is done by electroplating process, with various voltages of 3V, 3.5V, 4V and 5V and the liquid is heated to a temperature of 44-60oC in the immersion time range of 30 minutes, 40 minutes and 50 minutes for each voltage variation. From the results of the study, it was found that the longer the immersion time in the electroplating process, the thicker the resulting layer with the addition of about 4 - 8µm for each difference in immersion time.

Cara pemakaian mesin cara dan perawatan Mesin Pengupas Gabah Padi kepada Masyarakat Desa Amborgan Kecamatan Porsea Kabupaten Tobasa Richard A.M Napitupulu; Perangin angin, siwan
Jurnal Visi Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2024): Jurnal Visi Pengabdian Kepada Masyarakat : Edisi Agustus 2024
Publisher : LPPM Universitas HKBP Nommensen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51622/pengabdian.v5i2.2447

Abstract Rice is an agricultural product that is the main consumption of the Indonesian people, especially the people of the province of North Sumatra and especially in the TOBASA area and the Amborgan Village Community, Porsea District. In an area there is usually only one unit of rice hulling machine. For the rice hulling process, most farmers do the milling at that place and often have to queue because of the many farmers who will hull the rice. Therefore, with the help of a rice hulling machine, it can make it easier for the community, especially the home industry, to speed up the rice hulling process. Therefore, the Mechanical Engineering Study Program, HKBP Nommensen University, carried out community service to the village of Amborgan Village, Porsea District, TOBASA Regency by donating and providing training on operating a rice hulling machine. The result is that the community and the district government, especially the TOBASA Regency DPRD, are very happy with this program. And the community there is helped by the tools donated by the UHN Mechanical Engineering Study Program because they can helpis the essence of all parts of a complete paper that contains 75-200 with 10pt font size and protrudes 1cm from the left margin and right margin. The abstract is written in less than half a page. Abstract written in English and Indonesian.

PENGARUH PARAMETER PEMESINAN TERHADAP KEKASARAN PERMUKAAN AI6061BE PADA PEMESINAN CNC MINI 500 WATT MENGGUNAKAN PAHAT KARBIDA STRAIGHT ENDMILL Napitupulu, Richard A. M.; Perangin angin, Siwan E.A.
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1812

The role of automatic machining with the help of computer programming such as Computer Numerically Controlled (CNC) has become commonplace today in both large and small industrial sectors or micro industry. CNC is a manufacturing process where previously programmed computer software is converted into code that can automate machining movements, one of which is the milling or lathe process. CNC performance is determined by machining output power. For micro industrial or laboratory scale, CNC with low power is usually used to cut soft materials such as wood, acrylic, aluminum and others. This is the basis for this research to look at the influence of machining parameters such as speed, depth of cut and feed rate on the surface roughness (Ra) of AI6061BE aluminum workpieces in the dry machining process on a mini CNC unit with a maximum spindle power of 500 watts. This research uses an experimental design based on the Taguchi method and takes the form of an L16 (43) orthogonal matrix. The chisel used is a Straight End Mill 2 fluke carbide chisel. The experiment was carried out 4 times cutting in the positive x-axis direction and 4 times in the negative x-axis direction for each variation of machining parameters. From the test results, surface roughness, feed rate is a parameter that is more influential than speed and depth of cut.

Analisa Kebutuhan Energi Termal Pada Kotak Pengering Biji Kopi Arabica yang di Isolasi dengan Aluminium Foil Siagian, Parulian; Napitupulu, Richard A. M.; Tampubolon, Miduk; Siagian, Lestina
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.946

The experiment test was carried out to obtain the composition of the caloric quality needed to determine the water content and the mass amount of coffee beans when they were dried by utilizing the sun's heat. Heat transfer processes by convection, conduction and radiation play an important role in the drying process with heat quality. Ambient temperature data of 350C with a constant fan rotation speed of 1.0m/s. The duration of the test is 5 days where the initial sample weight is 5000gr with the final result being a water content of 12-15%, with a duration of testing per day for 10 hours starting at 08.00-18.00Wib. The final drying weight of coffee beans for 5 days is: 2500.21gr with an initial weight of 5000kg. The temperature difference around the box is 31,110C. heat weight to evaporate water content Qh= 65.6058.kJ. and the heat required in heating the Coffee beans is 72,839 kJ. The ability to dry 5000gr of coffee beans requires total heat: 138.43kJ with a drying box volume of 8.88m3.

ANALISIS TEKNO EKONOMI ATAP SURYA STUDI KASUS DI KOTA MEDAN, INDONESIA Nababan, Wilson Sabastian; Sihombing, Suriady; Peranginangin, Siwan Ediamanta; Napitupulu, Richard A.M
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1197

Indonesia has released its pledge on reducing Greenhouse Gas (GHG) emissions. Mitigation measures include increasing the use of renewable energy. Solar roofs are one potential mitigation measure to meet GHG emission reduction and renewable energy targets. As more attention is being focused on developing this renewable energy resource globally, the technical and economic assessment of this resource is critical to ascertain its feasibility. In this study, a technological and economic analysis of solar roof tops is presented. The analysis was carried out based on solar irradiation in the city of Medan, Indonesia. Solar irradiation over several days was measured. The measured data and the solar photovoltaic module panels available in the Indonesian market are used to carry out the technical analysis. Based on the technical analysis and economic analysis carried out, the economic analysis of the results of the visualization of the power produced by the PV system which was carried out for 1 year resulted in a total value of electricity of IDR 3,672,895 for the city of Medan. It is expected to provide the necessary information to build cities with low emissions. Keywords: Solar Roof, Photovoltaics, Technoeconomics

Simulasi CFD Distribusi Temperatur pada Pengering Biji Kopi dengan Sistem Konveksi Paksa Pasaribu, Humisar; Lumbangaol, Partahi; Napitupulu, Richard A.M; Siagian, Parulian; Siagian, Horas S; Setyawan, Eko Yohanes
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1214

Drying is a mass transfer and heat transfer process that is strongly influenced by temperature and air velocity. The importance of analyzing the temperature distribution and air velocity is expected to be used as a reference to optimize the drying process to be faster and better. This study aims to analyze the temperature distribution and air velocity that occurs in a coffee bean dryer with a forced convection system using CFD simulation. CFD simulations are carried out using ANSYS Fluent software. with steady conditions, and using a pressure-based solver method. The obtained temperature distribution occurs with an estimated absorber temperature difference with the drying chamber is 31% during the day.

PENGARUH PARAMETER PEMESINAN TERHADAP KEKASARAN PERMUKAAN AI6061BE PADA PEMESINAN CNC MINI 500 WATT MENGGUNAKAN PAHAT KARBIDA STRAIGHT ENDMILL Napitupulu, Richard A. M.; Perangin angin, Siwan E.A.
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1812

The role of automatic machining with the help of computer programming such as Computer Numerically Controlled (CNC) has become commonplace today in both large and small industrial sectors or micro industry. CNC is a manufacturing process where previously programmed computer software is converted into code that can automate machining movements, one of which is the milling or lathe process. CNC performance is determined by machining output power. For micro industrial or laboratory scale, CNC with low power is usually used to cut soft materials such as wood, acrylic, aluminum and others. This is the basis for this research to look at the influence of machining parameters such as speed, depth of cut and feed rate on the surface roughness (Ra) of AI6061BE aluminum workpieces in the dry machining process on a mini CNC unit with a maximum spindle power of 500 watts. This research uses an experimental design based on the Taguchi method and takes the form of an L16 (43) orthogonal matrix. The chisel used is a Straight End Mill 2 fluke carbide chisel. The experiment was carried out 4 times cutting in the positive x-axis direction and 4 times in the negative x-axis direction for each variation of machining parameters. From the test results, surface roughness, feed rate is a parameter that is more influential than speed and depth of cut.

Experimental Test of the Effect of PCM Volume as Thermal Energy Storage Solar Power in Solar Cooking Units Napitupulu, Richard A.M.; Peranginangin, Siwan E.A.; Siagian, Parulian
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4266

One solution that can be taken to reduce GHG emissions is to reduce consumption of fossil fuels and replace them with renewable energy sources. Indonesia is rich in renewable energy sources, and one that has potential to be developed is solar energy. In line with Indonesia's development into a developed country, energy consumption is increasing. One of the activities that contributes to the largest energy use is cooking. The need for energy for cooking in Indonesia is large because the population and households are very large, No. 4 in the world. Solar Cooker is an alternative to reduce the use of fossil or traditional energy for cooking activities. Previous research has shown how the performance of a Solar Cooker can be improved if it is integrated with PCM thermal energy storage, making it possible to speed up cooking time, cook with low solar intensity and even make it possible to cook at night. However, the quantitative influence of the number of PCMs in a solar cooker has not been specifically explained or studied. A low quantity of PCM results in reduced performance, while a high quantity will increase the thermal load, and thus overheating. This research tested 4 units of Simple Tube type Solar Cooker with different quantities of PCM for each unit. From the results of testing the Solar Cooker with the PCM thermal Energy Storage TEST with variations in PCM volume, it showed performance in storing heat for longer even in conditions of high rainfall day and night conditions. This is shown from all observation results during the 6 days of the experiment. As evidenced by the low ambient air temperature and high humidity, especially at night, the temperature drop in the cooking vessel water is quite low. This applies to every variant. From the experimental results, it can also be seen that variants number 1 and 3, especially number 3, have quite good performance, in absorbing heat and storing heat with an outer diameter of 350 mm

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