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All Journal Jurnal Teknik Industri Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) EPI International Journal of Engineering
Ni Made Dwidiani
Program Studi Teknik Mesin Fakultas Teknik Universitas Udayana
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Waktu Treatment Serat terhadap Sifat Mekanik Komposit Serat Tapis Kelapa Suardana, Ngakan Putu Gede; Dwidiani, Ni Made
Jurnal Teknik Industri Vol 8, No 2 (2007): Agustus
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (572.205 KB) | DOI: 10.22219/JTIUMM.Vol8.No2.188-192

Abstract

Coconut tapis fiber is one of the natural fiber for use composites on account of its characteristic such as a high strength to weight ratio, resistance to corrosion, resistance to wear, good finishing surface, no health risk and easy availability. This research was conducted to study tensile strength and flexural strength of coconut tapis fiber reinforced composite with variable of fiber treatment in NaOH for 2, 4, and 6 hours. This research used coconut tapis fiber with 0.04 -1 mm diameter and 10 mm length, resin unsaturated polyester type Yukalac 157 BQTN-EX as its matrix, and metil etil keton peroxide 1% as its hardener. The fiber was treted in NaOH for 2, 4, and 6 hours, afterward rinsed and dried, respectively. The composite was made using press hand lay-up technique with post curing 2 hours at temperature of 620C. Tensile and flexure test specimen were made based on ASTM D3039 and ASTM D 790-03 standard accordingly. The result shows that tensile strength decrease with increasing treatment in NaOH. The highest tensile strength was achieved by 2 hours treatment in NaOH at 58.8 MPa. The highest tensile strain was achieved by 2 hours treatment NaOH at 1.30%. The highest tensile modulus of elasticity was achieved by 6 hours treatment in NaOH at 5.07 GPa. In agreement with tensile strength, flexural strength also decreased with increasing treatment in NaOH. The highest flexural strength was achieved by 2 hours treatment in NaOH at 125.98 MPa, and the highest flexural strain was achieved by 2 hours treatment in NaOH at 1.35%. The highest flexural modulus of elasticity was achieved by 6 hours treatment in NaOH at 13.55GPa.
Characteristics of Active Carbon from Utilization of Red Chili Trees (Capsicum annuum L) Ni Made Dwidiani; Putu Wijaya Sunu; Gusti Ngurah Nitya Santhiarsa
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.03

Abstract

This work studies the use of red chilli tree (capsicum anuumm L) waste as material of activated carbon and examines the morphological structure and elemental composition of the activated chili trees. The morphological structure was measured at TekMIRA (Pusat Penelitian dan Pengembangan Teknologi Mineral dan Batubara, Bandung) by using the scanning electron microscope (SEM), and the composition of the elements of carbon, hydrogen, nitrogen and ash is determined by the ultimate testing analysis with the ASTM D5373 standard. In the testing procedure, activated carbon is made from red chili tree waste by dehydration with a temperature of 2000 C for 1 hour and carbonized with a temperature of 3750 C for 1 hour. Then, the chemical activation (NaOH) is made in variation of concentration of 1%, 3%, and 5% with soaked time 24 hours, and dried at 2000 C for one hour. The carbonization at a concentration of 1% (NaOH) gave the best result on activated carbon from red chili trees.
Pengaruh Waktu Treatment Serat terhadap Sifat Mekanik Komposit Serat Tapis Kelapa Ngakan Putu Gede Suardana; Ni Made Dwidiani
Jurnal Teknik Industri Vol. 8 No. 2 (2007): Agustus
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/JTIUMM.Vol8.No2.188-192

Abstract

Coconut tapis fiber is one of the natural fiber for use composites on account of its characteristic such as a high strength to weight ratio, resistance to corrosion, resistance to wear, good finishing surface, no health risk and easy availability. This research was conducted to study tensile strength and flexural strength of coconut tapis fiber reinforced composite with variable of fiber treatment in NaOH for 2, 4, and 6 hours. This research used coconut tapis fiber with 0.04 -1 mm diameter and 10 mm length, resin unsaturated polyester type Yukalac 157 BQTN-EX as its matrix, and metil etil keton peroxide 1% as its hardener. The fiber was treted in NaOH for 2, 4, and 6 hours, afterward rinsed and dried, respectively. The composite was made using press hand lay-up technique with post curing 2 hours at temperature of 620C. Tensile and flexure test specimen were made based on ASTM D3039 and ASTM D 790-03 standard accordingly. The result shows that tensile strength decrease with increasing treatment in NaOH. The highest tensile strength was achieved by 2 hours treatment in NaOH at 58.8 MPa. The highest tensile strain was achieved by 2 hours treatment NaOH at 1.30%. The highest tensile modulus of elasticity was achieved by 6 hours treatment in NaOH at 5.07 GPa. In agreement with tensile strength, flexural strength also decreased with increasing treatment in NaOH. The highest flexural strength was achieved by 2 hours treatment in NaOH at 125.98 MPa, and the highest flexural strain was achieved by 2 hours treatment in NaOH at 1.35%. The highest flexural modulus of elasticity was achieved by 6 hours treatment in NaOH at 13.55GPa.
Analisa Unjuk Kerja Alat Penukar Panas Amine Regenerator Reboiler di PT Pertamina EP Prabumulih Field Kelvin Ryanta Tanato; I Gusti Bagus WIjaya Kusuma; I Gusti Ngurah Nitya Santhiarsa; Ni Made Dwidiani
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 2 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Proses perpindahan panas merupakan proses yang banyak dipakai dalam industri perminyakan, salah satunya adalah Amine Regenerator Reboiler yang dipakai di PT PERTAMINA EP, yang merupakan heat exchanger jenis shell and tube yang berfungsi untuk mengubah fase dari bottom kolom de-propanizer yang berupa fase cair menjadi fase uap sebagai refluk dengan memanfaatkan steam sebagai fluida panas. Ada 3 hal yang mempengaruhi unjuk kerja penaukar panas yakni operating pressure, debit, dan heat flux. Oleh sebab itu, maka analisis unjuk kerja dari Amine Regenerator Reboiler dilakukan untuk mengetahui factor yang mempengaruhi menurunnya kinerja dari alat, apakah tekanan, debit ataukah heat flux yang mempengaruhi penurunan kinerja alat tersebut. Semua nilai dari persamaan diatas akan diperoleh dengan menggunakan dasar-dasar persamaan dalam perpindahan panas serta bilangan-bilangan tidak berdimensi. Dari penelitian ini, kesimpulan yang dapat kita ambil adalah pada on-design efektifitas atau performansi yang dihasilkan oleh amine regenerator sebesar 43.19 % sedangkan pada kondisi existing unjuk kerja yang dihasilkan adalah sebesar 27.28 %. Penurunan performansi di Amine Regenerator Reboiler disebabkan oleh rendahnya massa yang mengalir di sisi tube sehingga berakibat pada menurunnya temperatur yang disirkulasikan di alat penukar panas tersebut. Karena massa dan temperatur menurun, maka secara langsung menurunkan performansi dari alat penukar panas tersebut. Dari tiga parameter yang dipersyaratkan untuk menghitung performansi alat penukar panas, maka faktor dominan yang mempengaruhi adalah massa fluida yang mengalir di sisi tube. Rendahnya massa fluida tersebut berakibat pada menurunnya temperatur yang dipindahkan dan mengakibatkan turunnya heat fluks yang dipertukarkan. The heat transfer process is a widely used process in the petroleum industry, one of which is the Amine Regenerator Reboiler used in PT PERTAMINA EP, which is a heat exchanger of shell and tube type that serves to change the phase of the bottom of the de-propanizer column in the form of liquid phase into phase steam as a reflux by utilizing steam as a hot fluid. There are three things that affect the performance of heat exchangers namely operating pressure, discharge, and heat flux. Therefore, performance analysis of Amine Regenerator Reboiler is performed to determine the factors that influence the decreasing performance of the appliance, whether pressure, discharge or heat flux that affect the performance degradation of the tool. All values ??of the above equations will be obtained by using the basics of equations in heat transfer as well as dimensionless numbers. From this research, the conclusion that we can take is on the on-design effectiveness or performance generated by amine regenerator of 43.19% while in the existing condition the resulting performance is 27.28%. The decrease in performance in the Reboiler Amine Regenerator is due to the low mass flowing on the side of the tube resulting in decreased temperature being circulated in the heat exchanger. As the mass and temperature decrease, it directly decreases the performance of the heat exchanger. Of the three parameters required to calculate the performance of the heat exchanger, the dominant factor that affects the fluid mass flowing on the side of the tube. The low mass of the fluid results in a decrease in transferred temperature and resulted in a decrease in the heat fluxes being exchanged.
Analisa Getaran Mekanik Pada Panser Badak Andoyo Rifky Widighda; I Gusti Bagus Wijaya Kusuma; I Gusti Ngurah Nitya Santhiarsa; Ni Made Dwidiani
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 2 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Dalam pemerintahan Presiden Jokowi sekarang ini beberapa peralatan perang Indonesia diwajibkan dibuat bangsa Indonesia sendiri setidaknya 30% komponen lokal dan 70% nya boleh mengimpor. Pada kesempatan ini penelitian difokuskan pada kendaraan khusus yang diproduksi oleh PT. Pindad (Persero) yaitu Panser BADAK. Karena Panser BADAK ini dilengkapi persenjataan sehingga pada saat melakukan penembakan akan terjadi getaran pada turret maupun bodi nya itu sendiri. Di dalam getaran sendiri ada beberapa parameter yang harus diperhatikan yaitu seperti osilasinya, error, dan stabilitas turret panser. Oleh sebab itu perlu diteliti getaran yang terjadi pada panser BADAK agar menghasilkan simpangan dan kesalahan sekecilnya pada saat dioperasikan. The current administration of President Jokowi some Indonesian war equipment is required to be made by the Indonesian nation alone at least 30% of local components and 70% of them may import. On this occasion research focused on special vehicles manufactured by PT. Pindad (Persero) is Panzer BADAK. Because Panzer BADAK is equipped with weaponry so that at the time of the shooting will occur vibration on the turret or body itself. In the vibration itself there are several parameters that must be considered, such as oscillation, error, and stability of the turret panser. Therefore it is necessary to investigate the vibrations that occur in the BADAK tank to produce the deviation and errors as small as when operated.
Analisa Sistem Pembuangan Limbah pada Pembangkit Listrik Panas Bumi (PLTP) Bedugul I Made Bayu Artikajaya; I Gusti Bagus WIjaya Kusuma; Cok Istri Putri Kusuma Kencanawati; Ni Made Dwidiani
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 2 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Pembangkit Listrik Tenaga Panas Bumi (Geothermal) merupakan salah pembangkit listrik yang mampu di terapkan di Indonesia khususnya di Bali. Di Bali sendiri PLTP sudah mulai dibangun sejak tahun 1997, namun proyek tersebut mangkrak dan baru digarap lagi tahun 2005. Pada tahun 2005 masyarakat sekitar menolak pembangunan proyek tersebut, karena masyarakat resah dengan akan menyusutnya air permukaan danau akibat eksplorasi 3 sumur yang dibangun. Penelitian ini dimaksudkan untuk menganalisis apakah PLTP Bedugul dapat dikatakan renewable dengan menghitung besarnya laju aliran massa limbah cair dan uap yang dihasilkan. Pada PLTP Bedugul terdapat dua jenis fluida yang digunakan, yakni uap panas bumi sebagai bahan pemanas serta brine sebagai fluida kerja yang digunakan untuk memutar turbin. Maka dari itu nantinya akan didapatkan 4 jenis limbah yang dihasilkan dari PLTP Bedugul. Untuk mendapatkan data, penulis melakukan observasi ditambah dengan melakukan simulasi terhadap PLTP Bedugul tersebut. Berdasarkan hasil penelitian maka didapat Limbah cair steam memiliki laju aliran massa sebesar 3,02 kg/s sedangkan limbah dalam bentuk uap memiliki laju aliran massa sebesar 0,09 kg/s. Limbah cair brine memiliki laju aliran massa sebesar 18,7 kg/s sedangkan limbah dalam bentuk uap memiliki laju aliran massa sebesar 4,5 kg/s. Geothermal Power Plant is one of the power plants that can be applied in Indonesia, especially in Bali. In Bali Geothermal Power Plant has been built since 1997, but the project was stopped and begin again in 2005. In 2005 the villains refused the construction of the project, because they scared with the shrinking surface water of the lake due to the exploration of 3 wells built. This research is intended to analyzing is Bedugul Geothermal Power Plant can be said to be renewable by calculating the mass flow rate of liquid waste and steam generated. In Bedugul Geothermal Power Plant there are two types of fluid used, there were geothermal steam as a heater and brine as a working fluid used to rotate turbines. Therefore it will be obtained 4 types of waste came from Bedugul Geothermal Power Plant. To get the data the author making an observations and coupled with a simulation of the Bedugul Geothermal Power Plant. The steam liquid waste has a mass flow rate of 3,02 kg / s while the waste in the vapor form has a mass flow rate of 0.09 kg / s. Brine liquid waste has a mass flow rate of 18,7 kg / s whereas waste in the form of steam has a mass flow rate of 4,5 kg / s.
Fenomena Transport Heat Exchanger Sistem Untai Miftah Ayu Fauziah; I Gusti Bagus Wijaya Kusuma; I Nengah Suarnadwipa; Ni Made Dwidiani
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 2 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Heat exchanger sistem untai adalah suatu alat yang dibuat khusus untuk aliran satu-fasa dengan variabel diantaranya daya pemanas dan laju aliran fluida. Daya pemanas dalam untai berupa elemen pemanas air yang memiliki daya 1000 Watt. Heat exchanger sistem untai tersusun atas heater tank, cooling tank, dan pipa kaca (pyrex) yang membentuk sebuat siklus. Adapun fungsi dari masing-masing bagian yaitu, heater tank berfungsi sebagai media memanaskan alir dengan elemen pemanas hingga waktu yang telah ditentukan. Cooling tank berfungsi sebagai media mendinginkan air dimana pada cooling tank terdapat heat exchanger berupa coil and shell yang direndam dalam air atau kolam pendingin, di dalam heat exchanger fluida berupa air yang terlebih dahulu telah dipanaskan, air dipanaskan pada heater tank akan memberikan efek perubahan kerapatan fluida yang akan menyebabkan terjadinya pergerakan fluida yang disebabkan oleh efek buoyancy, yang tersusun atas pipa kaca dan membentuk sebuah siklus. Penelitian ini bertujuan untuk mengetahui kecepatan aliran fluida dalam heat exchanger sistem untai melalui simulasi ansys fluent dan menganalisa perpindahan kalor yang terjadi serta dapat mengetahui banyaknya kalor yang mampu dipertukarkan melalui metode perhitungan secara matematis. Dari hasil penelitian, analisa perhitungan, dan simulasi yang telah dilakukan dengan input running simulasi yaitu temperatur dan tekanan didapatkan output yaitu velocity aliran fluida sebesar 1,264 m/s. Adapun panas yang dapat dipertukarkan pada heater tank sebesar 2039,66 Watt dan hanya memiliki efektifitas sebesar 38%. Pada Cooling tank mampu mempertukarkan kalor sebesar11281,53 Watt dan memiliki efektifitas sebesar 84% serta jumlah heat transfer yang mampu disalurkan (NTU) sebesar 1,83. Heat exchanger strand system is a tool made specifically for single-phase flow with variables including heating power and fluid flow rate. Heating power in the strand is a water heater element that has 1000 Watt power. Heat exchanger strand system is composed of heater tanks, cooling tanks, and glass pipes (pyrex) that form a cycle. The function of each section is, heater tank serves as a medium to heat the flow with the heating element until the time specified. Cooling tank serves as a cooling water medium where the cooling tanks contain heat exchanger in the form of coil and shell soaked in water or cooling pool, in a heat exchanger fluid in the form of water that has first been heated, water heated on the heater tank will give effect fluid density change which will lead to fluid movement caused by the buoyancy effect, which is composed of a glass pipe and form a cycle. This study aims to determine the speed of fluid flow in the heat exchanger strand system through simulation Ansys fluent and analyze the heat transfer that occurs and can know the amount of heat that can be exchanged through mathematical calculation method. From the results of research, calculation analysis, and simulations that have been done with input running simulation ie temperature and pressure obtained output velocity fluid flow of 1,264 m / s. The heat that can be exchanged on the heater tank of 2039.66 Watt and only has the effectiveness of 38%. In Cooling tanks capable of exchanging heat of 11281.53 Watt and has an effectiveness of 84% and the amount of heat transfer that can be channeled (NTU) of 1.83.
Analisis Energy Sistem Biner Pada Pembangkit Listrik Panas Bumi (PLTP) Bedugul I Putu Yajnartha; I Gusti Bagus Wijaya Kusuma; Made Sucipta; Ni Made Dwidiani
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 2 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Tingginya tingkat kebutuhan akan listrik di Bali seharusnya dapat diatasi, mengingat cadangan sumber daya alam berupa panas bumi (geothermal)seharusnya sudah di aplikasikan pada PLTP. Dalam perjalanannya PLTP Bedugul mengalami hambatan khususnya pada daya yang mampu di bangkitkan sangatlah kecil. Dalam upaya meningkatkan daya yang dapat dibangkitkan oleh PLTP Bedugul sebenarnya dapat dilakukan dengan berbagai cara salah satunya adalah modifikasi dengan binary cycle dan perhitungan daya yang dibangkitkan dengan metode energy. Penelitian ini dilakukan dengan simulasi CFD dan CAD drawing dengan menggunakan brine CH4 kemudian membandingkan daya dengan metode energy antara daya yang dibangkitan dengan brine dan tanpa brine. Dan berdasarkan hasil simulasi daya pada PLTP yang menggunakan brine dapat membangkitkan daya sebesar 32,7 MW atau 7 kali lebih tinggi dibandingkan dengan PLTP dengan fluida kerja tanpa brine. The high necessity of electricity in Bali should be able to overcome regarding the natural resources of geothermal should have been applied in PLTP. PLTP Bedugul, on its progress of development, encounters some obstacles especially on the small electrical power it can be generated. On the efforts to increase the electrical power that can be generated by PLTP Bedugul, it actually can be done in many ways, one is modification by binary cycle and generated power measurement with energy method. This research was done by CFD simulation and CAD drawing by using brine CH4. Afterwards, the electrical power between the powers generated with brine and without brine were compared with energi method. Based on the result of power simulation on PLTP that use brine, it could generate electrical power for 32,7 MW or seven times higher than the PLTP of steam without brine.
Co-Authors Andoyo Rifky Widighda Cok Istri Putri Kusuma Kencanawati I Gusti Bagus Wijaya Kusuma I Gusti Ngurah Nitya Santhiarsa I Made Bayu Artikajaya I Nengah Suarnadwipa I Putu Yajnartha Kelvin Ryanta Tanato Made Sucipta Miftah Ayu Fauziah NPG Suardana Putu Wijaya Sunu