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All Journal Jurnal Energi Dan Manufaktur Rekayasa Mesin Sinergi ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Rekayasa Mesin Journal of Mechanical Engineering Science and Technology JTERA (Jurnal Teknologi Rekayasa) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Jurnal Elemen J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Jurnal Abdi Masyarakat Indonesia Jurnal Ilmiah Teknik Mesin Poros Jurnal Offshore: Oil, Production Facilities, and Renewable Energy Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin

Hary Sutjahjono

Jurusan Teknik Mesin, Universitas Jember

Author-ID : 488578

Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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ANALISIS PENGARUH VARIASI GRADE BIOETANOL TERHADAP DISTRIBUSI TEMPERATUR NYALA API DAN UNJUK KERJA PADA KOMPOR BIOETANOL TANPA SUMBU TIPE TOP BURNER Pratama, Adhitia Yanuar; Sanata, Andi; Sutjahjono, Hary
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.532 KB)

Top burner cotton less bioethanol stove is one of the appliances that apply the use of renewable fuels for domestic capacity. Application of this stove burner is a solution for scarcity of fossil fuel supplies. This study focused on variations in the distribution of flame temperature and performance on the top burner as grade of bioethanol varies at value of 55%, 70%, 85%, and 97%. Flame temperature distribution measured at of their hot spots and then simulated using Matlab R2011a to obtain isothermal contour flame shape and determine the flame temperature distribution of the flame. Performance testing used Standard International Water Boiling Test version 4.1.2 to determine the power, thermal efficiency, specific fuel consumption, and heat transfer. Results obtained that the flame temperature distribution, in the form of profiles and contours isothermal flame, reached its optimum when using bioethanol grade of 97%. Optimal performance on a stove burner using bioethanol 97% with power stove equal to 1.85 kW, the thermal efficiency of 72.21%, specific fuel consumption (Sfc) 0.512 kgbb/kguap, and heat transfer at value of 2,959 kW was also achieved at the same grade. The higher grade bioethanol used to increase the flame temperature distribution and performance of the stove.Â Keywords: Bioethanol, Stove, Temperature Distribution, Performance

PENAMBAHAN DAN VARIASI DIMENSI SIRIP ALUMINIUM PADA TUBE TERHADAP LAJU DAN EFEKTIVITAS PERPINDAHAN PANAS DALAM HEAT EXCHANGER TIPE SHELL AND TUBE T., Rohman; Sutjahjono, Hary; Listyadi, Digdo
ROTOR Vol 6, No 2 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (154.35 KB)

Heat exchanger is a device that serves to change temperature and the phase of fluid. By utilizing heat transfer between two fluids with different temperature from the higher temperature fluid to a lower temperature fluid. This study aims to determine the effect of the addition aluminum fins and dimensional variations on the effectiveness shell and tube heat exchanger. Heat Exchanger was tested by varying the dimensions of the aluminum fins on the tube from the tube without fins, fin tube with a length of 10 mm, 20 mm, and 30 mm. Tests carried out in counter flow so that the heat transfer rate will be better than the directional flow. Of the test will come out hot fluid temperature and cold fluid temperature out. The results showed decreases in the rate of heat transfer fins greater dimension and the dimension of the highest effectiveness without fins. The highest effectiveness is 25.85% in tube without fins. It can be concluded that the addition of fin in this research will reduce the effectiveness of the heat exchanger shell and tube type.Â Keywords: Aluminum, effectiveness, fin dimension, heat exchanger

PENGARUH PUTARAN ROTARY DRYER DAN WAKTU PROSES TERHADAP LAJU PENGERINGAN DAUN TEH HIJAU Romadhon, Rizki; Mutaqqin, Aris Zainul; Sutjahjono, Hary
J-Proteksion Vol 4, No 2 (2020): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v4i2.3142

Produksi daun teh hijau di Indonesia sangat tinggi. Keterbatasan yang ada pada petani lokal untuk memproduksi teh hijau maka diciptakan alat pengeringan teh rotary dryer. Alat ini diciptakan agar bisa memproduksi teh yang optimal dengan dana seminimal mungkin. Metode penelitian yang digunakan adalah eksperimen, dengan cara mengeringkan bahan baku daun teh hijau menggunakan mesin rotary dryer. Proses pengeringan dilakukan dengan variasi waktu 45; 60; 75 menit dengan variasi putaran 10; 15; 25 rpm. Setelah itu dilakukan proses penimbangan. Data hasil penelitian dianalisa dengan cara mengamati secara langsung hasil eksperimen kemudian dilakukan perhitungan kadar air, laju pengeringan, konsumsi energi dan konsumsi bahan bakar. Setelah nilai hasil perhitungan didapat, menentukan hasil dan menyimpulkan penelitian yang telah dilakukan dalam bentuk grafik dan tabel. Dari penelitian ini menunjukkan bahwa hasil pengeringan tertinggi didapat pada variasi putaran mesin 15 rpm dan 25 rpm dengan selang waktu proses pengeringan 75 menit dengan kadar air basis kering 94,81%bk. Laju pengeringan tertinggi terjadi pada putaran 10 rpm dengan selang waktu pengeringan 45 menit menghasilkan perpindahan massa uap air sebesar 0.45 kg/jam. Konsumsi energi tertinggi terjadi pada variasi putaran 25 rpm dengan variasi waktu 1,25 jam sebesar 0,293 kWh. Konsumsi bahan bakar tertinggi terjadi pada variasi waktu 75 menit sebesar 166,67 gram.

Karakteristik Aerodinamika Pontoon Pesawat NXXX Versi Amfibi Irsabudi, Andreas Maulana; Jatisukamto, Gaguk; Sutjahjono, Hary
Jurnal Rekayasa Mesin Vol 12, No 2 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.02.24

Seaplanes are aircraft that can take off and landing on water. A seaplaneâ€™s requirement is its need to take off and landing on watery conditions which is equipped with a pontoon.Â Pontoon of a seaplane needs to be evaluated in terms of aerodynamics characteristics when a seaplane flies. The purpose of this study is to determine the correlation of various geometric combinations of deadrise angle, step height, and constant cross-section length with the values of coefficient of drag (CD), coefficient of lift (CL) and coefficient of moment (CM). The methodology was carried out by simulating Computational Fluid Dynamics (CFD) using OpenFOAM software. The results of this study could be concluded that deadrise angle affected coefficient of drag (CD), coefficient of lift (CL) and coefficient of moment (CM) with each value of 0.0055, 0.0044, -0.0036, while step height didnâ€™t influence significantly on coefficient of drag (CD) and didnâ€™t affect coefficient of lift (CL) and coefficient of moment (CM). Constant cross-section length didnâ€™t affect significantly on coefficient of drag (CD) and coefficient of lift (CL) but increasing constant cross-section length increased coefficient of moment (CM) with a value of -0.0039.

PENGARUH PENAMBAHAN PHASE CHANGE MATERIAL (PCM) PADA PEMANAS AIR KOLEKTOR TABUNG DILENGKAPI DENGAN REFLEKTOR DOUBLE - U Veni Dwi Sulastri; Hary Sutjahjono; Ahmad Syuhri
Jurnal Energi Dan Manufaktur Vol 12 No 2 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Pemanas air energi surya merupakan suatu sistem pemanas air dengan cara kerja menyerap energi radiasi matahari yang kemudian diubah menjadi energi panas dan ditransfer menuju fluida kerja melalui pipa air. Pemanas air ini dibagi menjadi dua yaitu pemanas air kolektor tabung dan pemanas air kolektor plat datar. Dilakukan penelitian dengan menambahkan bahan Phase Change Material (PCM) yaitu sebuah material yang dapat menyimpan energi panas pada pemanas air kolektor tabung dilengkapi dengan reflektor double-U. Variabel pada penelitian ini yaitu pemanas air kolektor tabung tanpa menggunakan PCM dan menggunakan PCM, serta variasi laju aliran massa 0,008 kg/s, 0,010 kg/s, dan 0,030 kg/s. Bahan PCM yang digunakan yaitu campuran parafin 70% dan minyak goreng 30%. Tujuan dari penelitian ini yaitu untuk mengetahui pengaruh penambahan PCM terhadap temperatur air dan efisiensi dari pemanas air kolektor tabung. Hasil dari penelitian menunjukkan bahwa efisiensi tertinggi terjadi pada pemanas air kolektor tabung menggunakan PCM dengan laju aliran massa 0,030 kg/s yaitu sebesar 53,11%. Solar water heater is a system that can absorb solar radiation energy and converted it into heat energy and transferred to the fluid of water pipe. Solar water heaters are divided into two types, that are tube collector water heater and flat plate collector water heater. The study was conducted by adding Phase Change Material (PCM), a material that can store heat energy in the tube collector water heater equipped with a double-U reflector. The variables in this study were tube collector water heaters without using PCM and tube collector water heaters using PCM, as well as variations in mass flow rates of 0.008 kg / s, 0.010 kg / s, and 0.030 kg / s. The PCM material used is 70% of paraffin and 30% of cooking oil. The purpose of this study is to determine the effect of adding PCM to water temperature and efficiency of tube collector water heaters. The results of the study showed that the highest efficiency occurred in tube collector water heaters using PCM with a mass flow rate of 0.030 kg / s which was equal to 53.11%.

Karakteristik Biodiesel dari Minyak Biji Randu (Ceiba Pentandra) dengan Proses Transesterifikasi Menggunkan Katalis NaoH Nofal Kharis; Hary Sutjahjono; Hari Arbiantara; Digdo Listyadi Setyawan; Nasrul Ilminnafik
Jurnal Energi Dan Manufaktur Vol 12 No 1 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Indonesia sangat berpotensi untuk produksi bahan bakar biodiesel yang berbahan nabati dengan keunggulan yaitu bisa diperbaharui. Banyak sumber bahan bakar alternatif yang mudah ditemukan di Indonesia untuk dijadikan bahan pembuatan biodiesel salah satunya biji randu. Pembuatan biodiesel dari bahan minyak biji randu yang diperoleh dengan cara biji randu dikeringkan terlebih dahulu kemudian biji dihancurkan dan haluskan menggunakan mesin penggiling, kemudian setelah biji halus hasil dari penggilingan dipress untuk mendapatkan minyaknya. Ektraksi biji kapuk menghasilkan 16-25 % ml minyak biji randu dari berat biji. Proses degumming dengan cara minyak ditimbang kemudian dipanaskan dengan suhu mencapai ±50 °C, Kemudian di tambahkan asam phospat sebanyak 0,1% dari berat minyak randu. Dengan suhu minyak dipertahankan selama 60 menit. Kemudian proses transesterifikasi dilakukan pencampuran larutan pada suhu 50 °C dengan lama pengadukan 90 menit, proses transesterifikasi menggunakan larutan metanol dan NaoH sebebagai katalis untuk menghasilkan metyl ester. Kemudian biodiesel diuji karakteristiknya dari pengujian menghasilkan nilai kalor 8641,473 kal/gram, densitas 8730 g/cm³, viskositas 6.815 cst, flash point 115 °C. Indonesia has the potential for the production of biodiesel fuels made from vegetables with many advantages, which can be renewed. There are many alternative fuel sources that are easily found in Indonesia to make biodiesel as one of the ingredients for seedling. The making of biodiesel from the ingredients of linseed oil obtained by means of litter seeds is dried first then the seeds are crushed and puree using a grinding machine, then after the fine seeds from the mill are pressed to get the oil. Extraction of kapok seeds produces 16-25% ml of seed oil from seed weight. The Degumming process by weighing the oil is then heated with temperatures reaching ± 50 ° C, then phosphate acid is added as much as 0.1% of the weight of the oil. With the oil temperature maintained for 60 minutes. Then the transesterification process was carried out by mixing the solution at 50 ° C with a stirring time of 90 minutes, the transesterification process using methanol and NaoH as a catalyst to produce metyl ester. Then the characteristics of the biodiesel tested from the test produced a heating value of 8641,473 cal / gram, density 8730 g / cm30, viscosity 6,815 cst, flash point 115 ° C.

ANALISIS PENGARUH VARIASI GRADE BIOETANOL TERHADAP DISTRIBUSI TEMPERATUR NYALA API DAN UNJUK KERJA PADA KOMPOR BIOETANOL TANPA SUMBU TIPE TOP BURNER Adhitia Yanuar Pratama; Andi Sanata; Hary Sutjahjono
ROTOR Vol 6 No 1 (2013)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.532 KB)

Top burner cotton less bioethanol stove is one of the appliances that apply the use of renewable fuels for domestic capacity. Application of this stove burner is a solution for scarcity of fossil fuel supplies. This study focused on variations in the distribution of flame temperature and performance on the top burner as grade of bioethanol varies at value of 55%, 70%, 85%, and 97%. Flame temperature distribution measured at of their hot spots and then simulated using Matlab R2011a to obtain isothermal contour flame shape and determine the flame temperature distribution of the flame. Performance testing used Standard International Water Boiling Test version 4.1.2 to determine the power, thermal efficiency, specific fuel consumption, and heat transfer. Results obtained that the flame temperature distribution, in the form of profiles and contours isothermal flame, reached its optimum when using bioethanol grade of 97%. Optimal performance on a stove burner using bioethanol 97% with power stove equal to 1.85 kW, the thermal efficiency of 72.21%, specific fuel consumption (Sfc) 0.512 kgbb/kguap, and heat transfer at value of 2,959 kW was also achieved at the same grade. The higher grade bioethanol used to increase the flame temperature distribution and performance of the stove. Keywords: Bioethanol, Stove, Temperature Distribution, Performance

ANALISIS TEGANGAN PADA ELBOW PIPE SA 123 Gr.T22 DI SHELL AND TUBE HEAT EXCHANGER Abdul Haris Siregar; Hary Sutjahjono; Agus Triono
ROTOR Vol 12 No 1 (2019)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Heat exchanger is a system used to transfer heat between fluids. The most cases of heat exchanger failure is leakage pipe. This study aims to see the effect of increasing the radius of the elbow pipe in the shell and tube heat exchanger on the stress due to internal and external pressure. The research using ANSYS 15 at elbow pipe radius 40 mm, 51 mm and 62 mm with internal pressure 20.4 MPa and external pressure 2.04 MPa. Obtained maximum results occur in 40 mm radius elbow pipe of 81,528 MPa and minimum result occurs in 62 mm of 76,212 MPa. The stress that occurs in all elbow pipe can be said safe because the stress value is still under the pipe material yield point.

PENGARUH KETINGGIAN TERBANG TERHADAP ENDURANCE MAKSIMUM TERBANG JELAJAH PESAWAT N219 MENGGUNAKAN METODE Pr-V Akhmad Nirman Zaki; Hary Sutjahjono; FX. Kristianta
ROTOR 2017: ROTOR Special Edition
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

As a plane that is still in flight testing period then the N219 aircraft needs to be assessed for evaluation purposes. Focus in this study is on field of performance. This field is studied to determine the performance of N219 aircraft especially in the cruise phase. This study was conducted with the aim to determine the effect of variations in the selection of flying alititudes on the achievement of maximum endurance flying. The calculation method is done by using Pr-V graph. This method is used to determine the maximum endurance through the minimum power required curve. The result show that the increase in flying height cause the decrease of air density. This happens because the pressure and temperature of the air also decreases with increasing height. In addition, the increase in flying altitude also affects the fuel flow. Fuel flow decrease with increasing altitude. Conversely, the maximum endurance increases with the increase in altitude. This happens because the endurance is derived from the division of the fuel flow weight, so the endurance is inversely proportional to the fuel flow. The lowest maximum endurance value occurs at sea level is 6,48 jam, and the highest maximum endurance value occurs at 10.000 ft is 8,65 jam. Keywords: Endurance, cruise, altitude

PENGARUH VARIASI UKURAN PARTIKEL KOPI TERHADAP NILAI KONDUKTIVITAS TERMAL KOMPOSIT DENGAN MATRIK POLYESTER ETERSET 2504 APT Rezky Agus Setiawan; Dedi Dwilaksana; Hary Sutjahjono
ROTOR Vol 9 No 1 (2016)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.851 KB)

Heat transfer is a science to determine heat transfer occurs in certain conditions due to temperature differences. The thermal conductivity is the nature of the form termofisik transport properties for heat transfer. Thermal conductivity value indicates how quickly heat mangalir in that particular material and understand the phenomena that occur in the conduction heat transfer. In this study focused on the value of the thermal conductivity of composite particles robusta coffee with a variety of mesh sizes 20, 40, 60, 80 and 100. The method of making composite using hand lay up. Variables used include variations in particle size coffee mesh 20, 40, 60, 80 and 100. The tests performed by the method of thermal conductivity in the composite particles of coffee. Data collection was performed by the method of observation for 60 minutes. From the research results minimum composite thermal conductivity values on the particle size of coffee that passes sieve mesh 20 that is equal to 0.006 W / mᵒC, composite thermal conductivity values optimum particle size of the coffee that passes sieve mesh 60 that is equal to 0.013 W / mᵒC. While the value of thermal conductivity composites in the coffee particle size that passes a sieve mesh of 100 decrease in the amount of 0.008 W / mᵒC. From the data analysis, it can be concluded that the smaller the particle size of the coffee, the thermal conductivity decreases indicating increased ability to inhibit heat conduction.

Co-Authors ., Sumarji Abdul Aziz Abdul Haris Siregar Adhitia Yanuar Pratama Adhitia Yanuar Pratama, Adhitia Yanuar Agus Triono Agus Triono Ahmad Adib Rosyadi Ahmad Syuhri Akhmad Nirman Zaki Ales, Steve Korakan Alfredo Bayu Satriya Andi Sanata Andreas Maulana Irsabudi Aris Zainul Mutaqqin Basuki , Hari Arbiantara Charismanda Adilla Tristianto Danang Yudistiro Dedi Dwilaksana Devlin, Nigel Gavriel Digdo Listyadi, Digdo Dimas Aditya Dinul Maulidin Dwi Djumharianto Dwi Djumhariyanto Efendi , Moh Riski ERICHA DWI WAHYU SYAH PUTRI Fx. Kristianta Gaguk Jatisukamto Ghozian Hilmi M Gita Kusumastuti Guguk Jatisukamto Hadiatama, Intan Hari Arbiantara Hentihu, Fahrur Rozy Ilman Muhammad Azmi Ilminafik, Nasrul Ilmninafik, Narsul Indria Dwi Puspita, Hery Intan Hardiatama Irjik Abror Maulana Irfida Irsabudi, Andreas Maulana Jannah, Betriqil Jatisukamto , Gaguk Koekoeh KW, Robertoes Luh Putu Ratna Sundari M Arief Hidayat M Asrofi M Dimyati Nashrullah M Katibi Vanhas Mahros Darsin Misto Misto Mochamad Asrofi Mochamad Trifiananto Muhammad Trifiananto Muhammat Dwi Karisma Mutaqqin, Aris Zainul Nanda Jefri AR Nasrul Ilminnafik Nofal Kharis Nofal Kharis Kharis Noor HS, Skriptyan Novel Bagas Satrio Wibowo Prayoga Krisna Febriaji Puranggo Ganjar Widityo Rahma Rei Sakura Ramadhan, Ivan Fadilla Ramadhan, M Edoward Rezky Agus Setiawan Ririn Endah Badriani, Ririn Endah Rizki Romadhon Robertoes Koekoeh KW Robertoes Koekoeh KW Robertus Sidartawan Rohman T. Rohman T., Rohman Romadhon, Rizki Rozy H, M Fahrur Salahuddin Junus Salwasana, Allisa Santoso Mulyadi Saputra, Dheo Ardi Nugraha Setiawan, Digdo Listyadi Setyo Pambudi Siti Nur Rahmah Anwar Sumarji Veni Dwi Sulastri Wazirotus Sakinah Yuni Hermawan

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