Nazaruddin Sinaga

• Professor
• Head of Efficiency and Energy Conservation Laboratory at Diponegoro University

Peningkatan kebutuhan bahan bakar dan terbatasnya sumber daya alam menyebabkan berkurangnya jumlah minyak yang tersedia. Untuk mengatasi permasalahan tersebut maka diperlukan alat untuk mengukur konsumsi bahan bakar dari kendaraan yang dinamakan fuel flowmeter. Fuel flowmeter adalah alat yang digunakan untuk mengetahui aliran bahan bakar dalam suat...

ABSTRAK Penggunaan energi fosil yang berlebihan menyebabkan berkurangnya sumber daya energi, memicu pemanasan global, efek rumah kaca dan polusi udara sehingga energi terbarukan menjadi solusi untuk mengatasi masalah tersebut. Dengan memanfaatkan energi air dengan head yang sangat rendah pada sungai atau saluran irigasi, dalam hal ini turbin reaks...

Abstrak Fin and tube heat exchanger (FTHE) banyak digunakan dalam sistem pendingin, petrokimia, dan aplikasi HVAC&R karena pembuatannya lebih mudah, konstruksinya sederhana, rendah biaya, dan relatif mudah dalam perawatan menjadikannya salah satu yang paling umum digunakan. Peningkatan kebaikan perpindahan panas pada FTHE telah banyak di investigas...

In journal bearing modeling, the phenomenon of cavitation is very important to improve the accuracy of the simulation results. This is because cavitation will almost certainly occur because there are convergent and divergent geometries. The results of the simulation will be close to real conditions so that it can have a positive effect on researche...

Solar powered grain drying machines (PGTM) have advantages over fossil energy, namely they are cheap and simple. However, the main obstacle is the dependence on time and weather. To overcome these weaknesses, it is necessary to create a combined system, namely, a solar and PGTL electric drying system. This machine works during the day and continues...

This research presents CFD analysis of the twodimensional subsonic flow over a GOE-387 airfoil at various thickness-to-chord ratios (t/C) and chord lengths, operating at a Reynolds number of 400,000. Lift Coefficient (CL), Drag Coefficient (CD), and CL/CD are investigated. The geometry of the airfoil is created using SolidWorks and Ansys Design Mod...

Heat sink merupakan alat penyerap kalor yang banyak digunakan untuk mendinginkan komponen-komponen elektronika. Saat ini metoda numerik menjadi salah satu opsi untuk menyelesaikan masalah perpindahan kalor karena memiliki keuntungan yaitu lebih cepat, murah, dan mudah. Riset ini bertujuan untuk mencari model simulasi terbaik pada straight fin heat...

Abstrak Heat sink merupakan alat penyerap kalor yang banyak digunakan untuk mendinginkan komponen-komponen elektronika. Saat ini metode numerik menjadi salah satu opsi untuk menyelesaikan masalah perpindahan kalor karena memiliki keuntungan yaitu lebih cepat, murah, dan mudah. Riset ini bertujuan untuk mencari model simulasi terbaik pada straight f...

The inherent high thermal resistance of air impedes the heat transfer rate from tube surfacesto airflow within channels. This study aims to mitigate this issue by deploying perforated delta winglet pairs as vortex generators (VGs), arranged in-line to reduce thermal resistance. Experimentation involved the installation of these vortex generators wi...

Hydrogen has long been recognized as a revolutionary component in the transition to a post-carbon era. However, there is significant debate regarding the exact nature of this future, with some expressing concerns about insufficient demand, while others overlook the limitations of hydrogen. The recent crisis in fossil fuel supply has been driven by...

Di tengah cadangan energi yang kian menipis dan meningkatnya konsumsi bahan bakar, khususnya Bahan Bakar Minyak (BBM), maka jelas keadaan ini sangat mengkhawatirkan. Dalam situasi seperti ini, maka memahami pola konsumsi energi yang dilakukan oleh masyarakat adalah suatu keharusan dan menjadi hal penting bagi pemerintah sebagai regulator dan pengen...

In the concept of downsizing an internal combustion engine, the turbocharger in one of the key device for reducing emissions while maintaining engine performance. Turbine as one of the main components in a turbocharger has an important role in determining the power generated by an internal combustion engine. This paper presents the development of t...

Many studies are being conducted to determine the optimal cooling arrangement for solar panels. One of the main issues that persists is the cooling effect used to lower the temperature of PV cells. The issue with natural convection air cooling surrounding solar panels is that it is thought to need to be more efficient in absorbing heat. It is neces...

Pulau Bawean yang terletak di laut jawa yang berjarak 120 km sebelah utara Gresik. Kebutuhan energi listrik di Pulau Bawean diperoleh dari Pembangkit Listrik Tenaga Diesel akan tetapi masih ada beberapa desa yang belum dialiri listrik. Keterlambatan suplai bahan bakar solar dikarenakan ombak yang besar juga merupakan permasalahan yang dialami oleh...

Lubricant viscosity is determined by temperature distribution, design of lubricant analysis is essential. In this study, the performance of a journal bearing was investigated. The surface materials are treated using a hydrophobic coating to obtain an artificial slip. The simulation is carried out using 3D modeling of CFD. In this study, the hydroph...

Bauran energi primer di Indonesia masih didominasi oleh energi fosil, salah satunya batubara. Indonesia tercatat memiliki sumber daya batubara sebesar 110,07 Milyar Ton dan cadangan sebesar 36,28 Milyar Ton, yang didominasi oleh batubara kalori rendah dan sedang. Sekitar 72% dari produksi batubara dalam negeri dilakukan ekspor. Saat ini Pemerintah...

Energy use always increases, especially fossil energy. Through the National Energy Policy, the government continues to strive to increase the role of new and renewable energy sources so as to reduce dependence on fossil energy. Solar power generation is a type of renewable energy generator that capable to convert solar energy to electric energy. Th...

In this modernization era, it is undeniable that the need for electricity will continue to increase alongwith the times. Therefore a power plant works non-stop. The efficiency of gas turbine performance isvery important in the power generation industry because it is directly related to the cost of producingelectricity. It is necessary to analyze th...

Coupling different energy conversion systems together to have more sustainable energy systems can be a promising way to cope with the challenges of the energy consumption crisis. In the current work, an organic Rankin cycle (ORC) has been coupled with some other units like the Kalina cycle and some other subunits including a proton exchange membran...

Gas Removal System (GRS) is vital in geothermal power plants since steam flows into the turbine and the condenser still has a certain amount of Non-Condensable Gas (NCG). The effect of the NCG will increase the pressure in the condenser so that it will affect the power generation performance of the Geothermal Power Plant (GPP). The types of equipme...

Intisari-Pada 12 Desember 2015 telah dilaksanakan Confereence Of the Parties 21 (COP) di Paris tujuannya membatasi pemanasan global sampai dengan dibawah 2 o C dan lebih baik lagi jika bisa mencapai 1,5 o C. Saat ini pemanfaatan energi matahari menjadi energi listrik sangat masif diterapkan dan perkembangan teknologinya juga meningkat pesat. Pemeli...

Each of Units 1-4 SLA PGU has a capacity of 400 MW and seven feedwater heaters, namely three lowpressure feedwater heaters (LPH 1, 2, and 3), a deaerator, and three high-pressure feedwater heaters (HPH 5, 6, and 7). HPH 5 in Unit 2 has experienced 30% tube plugging, which is equivalent to 480 out of 1579 tubes. Plugging is expected to reduce the pe...

Achieving the national energy mix in 2025 requires accelerating capacity development in new and renewable energy.Utilization of new and renewable energy potential aims to achieve the national energy mix target. One of the new renewable energy that has the potential to be developed in Indonesia is Biomass for fuel. One of the efforts to increase the...

We must expedite the development of new and renewable energy capacity by 2025. Using renewable energy meets the national energy mix goal. Indonesia might utilize biomass as a renewable fuel. Cofiring helps utilize more biomass. Reduce fossil fuel consumption, biomass can be a good alternative energy source. The biomass is mixed into the coal bunker...

A propeller's thrust coefficient, efficiency, and torque coefficient are important performance characteristics. They can be harmed by the presence of cavitating flow. Previous numerical studies have shown that cavitating flow can damage a marine propeller as well as reduce its performance. The work presented here investigates the effect of blade nu...

The use fossil energy consumption in Indonesia is increasing along with population growth and industrial development. Fossil energy oil and coal can produce greenhouse gas emissions and environment pollution. The largest producer of CO2 emissions comes from exhaust gases in the production process and motor vehicles. Indonesia's energy mix target in...

The use fossil energy consumption in Indonesia is increasing along with population growth and industrial development. Fossil energy oil and coal can produce greenhouse gas emissions and environment pollution. The largest producer of CO2 emissions comes from exhaust gases in the production process and motor vehicles. Indonesia's energy mix target in...

Various heat sinks have been widely researched to get a better performance design. This research aims to study the effect of fin longitudinal spacing and Reynolds number on heat sink performance at an oblique angle of 45 degrees. This study utilizes a finite-volume computational approach to determine the performance and details of the flow on the h...

The wind turbine airfoil's aerodynamic performance aerodynamics becomes essential for the wind turbine. This study aimed to obtain the effect of free-stream turbulence intensity of wind turbine airfoil NACA 4415 using a 2D numerical method. Here, the turbulence intensity varied from 0.1% to 10% at Reynolds number 216,000 and by changing the angle o...

PLTU Berau 2 × 7 MW terletak di Kelurahan Teluk Bayur Kecamatan Teluk Bayur Kabupaten Berau Provinsi Kalimantan Timur yang Operation & Maintenance-nya di Kelola oleh PT. Indonesia Power. PLTU Berau 2 × 7 MW mensuplai energi listrik ke sistem jaringan isolated 20 KV Tanjung redeb. Konsumsi daya listrik (Pemakaian Sendiri) rata-rata sebesar 10.419.94...

Fin and tube is a compact heat exchanger, have been widely used in various engineering fields such as heating, ventilation, air conditioning, and refrigeration systems. An example, indoor and outdoor air-conditioning, the air is used as one of the heat exchanger media. However, over 90% of the total thermal resistance from air to liquid lies on the...

The world is aiming to shift to electric vehicles by year 2030 and one of the hurdles in the path is thermal management in the battery, motor and cabin. Even though there are several cooling methods available, their choice for a particular application may not be thermodynamically efficient. This study aims to thermodynamically evaluate the performa...

Train is the main means of land transportation used almost all over the world, including Indonesia. This means of transportation has multiple comparative advantages, is low in pollution, saves land and energy, and is mass in nature. The train is currently a means of transportation that is in great demand by the public. When compared to other means...

Present work focuses on the advanced exergy analysis of a combined system to recover energy from a regenerative supercritical CO2 Brayton cycle. Through thermodynamic analysis of the system, a simulation code in Engineering Equation Solver (EES) has been developed. However, the conventional exergy analysis is a useful tool to determine the location...

The purpose of this research is to examine the performance assessment and multi‐objective optimization of a multigeneration energy systems that include power generation, cooling, and freshwater. The system under investigation is composed of a fuel cell, a multi‐effect desalination plant, an absorption chiller, a steam generator, and a thermoelectri...

ABSTRAK Teknologi membrane Cellulose Triacetate (CTA), Hollow Fiber (HF) dan Sel Surya Perovskite. Kemampuan membrane mereduksi air garam dan Perovskite mengonversi sinar surya. Model proses pemurnian air laut Reverse Osmosis (RO) menjadi air bersih di mana kebutuhan energi spesifik ditekan menggunakan Energi Dukung Turbin (EDT). Produksi air bers...

In this paper, three two-dimensional cylindrical lithium-ion batteries are simulated. (PCM) surrounds these batteries. The batteries are linearly placed next to each other and the number of triangular blades is placed on them. The temperature values of each battery and battery pack have been examined by varying the distance between the batteries at...

Thermal behavior of diesel, Jatropha curcas methyl ester (JOME), and its B20 blend (20% biodiesel and 80% diesel) are examined from the profiles of thermogravimetry – differential scanning calorimetry (TG-DSC) under air. TG profiles of samples indicate the mass loss steps to volatilization and combustion of methyl esters. Due to the higher temperat...

Pembangkit listrik adalah kumpulan dari beberapa mesin yang sumber utamanya dari listrik tergabung dalam beberapa sistem atau sub sistem untuk menjalankan proses produksi menghasilkan energi listrik. Tidak semua listrik yang di hasilkan dari Generator disalurkan ke pelanggan namun juga ada listrik yang di pakai sendiri untuk menggerakkan motor-moto...

This paper examines a battery pack consisting of three cylindrical lithium-ion batteries in an enclosure saturated with Phase Change Material (PCM) using COMSOL software. A two-dimensional longitudinal section of the enclosure is evaluated transiently. There are 6 circular fins on the batteries, which are triangular in two dimensions. The temperatu...

Regenerative flow machines are known to be simple in construction but complex in flow characteristics. Due to this reason, the design of these machines has been primarily esoteric, and hence its performance heavily relies on the experience and expertise of the designer. Since there are no established rules of thumb for designing them, this paper atte...

Hydraulic Energy

The current study examines the impact of bioethanol blends on spark-ignited engine performance using multilayer perception modeling. Waste pomegranate fruits (WPF) from a nearby fruit market are used to make bioethanol. After 72 hours, the fruit juice mixture yielded 1.1 ± 0.3 mLgm⁻¹ ethanol. Each of four ethanol mixes was tested at different speed...

With the development of technology and science in the field of semiconductors and programming, all fields are digitized and automated. With the rapid development of technology, there are many impacts on the pattern of human life. Technology has become an inseparable part of this modern era. One of the widely used scientific models is a data acquisi...

Motorcycle maintenance to maintain optimal engine performance, such as servicing, cleaning, and tune-up. The process cannot be expressed in the form of data, because it cannot be seen in real terms and there are no parameters as benchmarks such as torque, power, and fuel consumption, so a dynamometer measuring instrument is needed. The design and m...

Cooling tower diperlukan di industri pembangkit listrik tenaga panas bumi untuk sirkulasi air pendingin dikontakkan dengan gas tak jenuh sehingga sebagian dari zat cair itu akan menguap, dan suhu zat cair turun. PT. Indonesia Power Kamojang menggunakan mesin Cooling Tower untuk melakukan pendinginan. Untuk mengetahui performansi kemampuan cooling t...

Geothermal energy is not fully utilized in Indonesia. Until 2020, the realization of geothermal development into electricity is 2,130.7 MW. One of the geothermal power plants (PLTP) in Indonesia that has been operating is the Sarulla Geothermal Power Plant. The total capacity produced by Sarulla is 330 MW. Sarulla is a Geothermal Combined Cycle tha...

Materi ini menjelaskan tentang hukum pertama dan kedua termodinamika dalam sistem konversi energi

Agriculture fruit waste and municipal waste management in many countries, especially in large crowded cities, is a serious problem. In the fruit and vegetable market, tons of garbage are generated that is worthless. Nearly 20–30% of the fruit and vegetables produced are solid waste that causes waste disposal problems. These solid wastes can be used...

Kuliah ini menjelaskan tentang dasar-dasar konversi energi

Kawasan perkebunan teh PT Pagilaran Batang, Jawa Tengah memiliki nilai radiasi rata-rata 5,30 kWh/m 2 /hari sepanjang tahun 2019 dan rata-rata 4,66 kWh/m 2 /hari dalam rentang 1997-2019. Konsumsi beban listrik PT Pagilaran secara keseluruhan adalah sebesar 2.853.919,89 kWh/tahun. Khusus untuk konsumsi beban listrik pabrik produksi dan pengolahan ad...

Makalah ini membahas tentang pengenalan energi terbarukan secara umum, kebijakan pemerintah RI tentang energi terbarukan dan konservasi energi, energi terbarukan yang dapat diterapkan di Indonesia, pemanfaatan energi terbarukan di bidang transportasi sebagai upaya untuk mengatasi masalah energi di Indonesia, dan efisiensi dan konservasi energi pada...

This study is to determine the heat rate of the steam turbine based on performance tests. Data collection was carried out by the observation method at PT Bukit Pembangkit Innovative PLTU Banjarsari Unit 2. To find out the value of the Heat rate in the steam turbine, a calculation method was used based on the balance of steam "steam" and energy in "...

Fossil fuel depletion and strict government regulations have necessitated the finding of alternatives to conventional fuel sources. The growing population and better transport are increasing the need for energy every day. The pollution and disposal of agriculture and food waste are still serious problems to be tackled. Bioethanol has proved an alte...

Improving heat transfer from surface to airflow is a current research concern for enhancing energy efficiency. The use of vortex generators for improving heat transfer from the surface to the airflow is very effective. Therefore, this study focuses on applying flat and concave vortex generators with and without holes in order to improve heat transf...

This course about internal incompressible viscous flow, which is given for undergraduate students of mechanical engineering in Diponegoro University, Semarang, Indonesia.

Cooling tower diperlukan di industri pembangkit listrik tenaga panas bumi untuk sirkulasi air pendingin dengan cara mengontakkan dengan gas tak jenuh sehingga sebagian dari zat cair itu akan menguap dan suhu zat cair turun. PT. Indonesia Power Kamojang menggunakan mesin Cooling tower untuk melakukan pendinginan. Untuk mengetahui performansi kemampu...

Saat ini sistem pembangkitan energi di dunia masih didominasi oleh energi fosil. Pada pembangkit listrik tenaga panas bumi, Cooling Tower digunakan untuk sirkulasi air pendingin yang dikontakkan dengan gas tak jenuh , sehingga sebagian dari zat cair itu akan menguap, dan suhu zat cair akan menurun. PT. Indonesia Power Kamojang dalam proses pembangk...

Kuliah ini menjelaskan aturan, metoda belajar, dan penilaian pada mata kuliah Konversi Energi dan Sistem Pembangkit

The recent Covid-19 pandemic and its required hygiene protocols further revealed the importance of ventilation process in all buildings deal with human life. Solar Chimney Ventilator (SCV) is a type of renewable technology that is able to provide natural ventilation for the buildings. However, conventional SCV is not economical due to its low perfo...

The importance of ventilation is highlighted through the recent COVID pandemic particularly in populated societies with crowded buildings. The application of single solar chimney ventilator with and without fin, at different tilt angles, is evaluated for Hong Kong climate using transient 3D validated numerical simulation in present research from en...

In this study, the authors reviewed the use of the ORC working fluid which was simulated using EES and reviewed several previous journals. The working fluids analyzed are isopentane as the working fluid used, isobutane and R245fa, where isobutane produces a higher power output compared to other secondary fluids because the enthalpy of steam enterin...

The cement industry is one of the most energy intensive industries in the world because in the production process it consumes about 12-15% of the total energy use and is equivalent to 30-40% of the total cement production cost. Exergy analysis is needed to determine work losses on a machine or system. In the calculation of exergy heat capacity data...

Pengembangan teknologi pengelolaan sampah yang juga menghasilkan energi adalah solusi permasalahan sampah serta energi berkelanjutan. Penanganan sampah belum memadai termasuk kendala lahan, sementara kapasitas sampah semakin bertambah. Penanganan sampah selama ini melalui Landfill Gas Collection dan Teknologi Termal dimana terdapat kendala lahan se...

Central Java Provincial Regulation No. 12 of 2018 concerning The General Regional Energy Plan of the Central Province of Java sets the target of using renewable energy (RE) in 2030 to reach 21.32%. By 2020, the use of renewable energy has been achieved by 11.89 %, so an improvement of 9.43 % is required to meet the target by the end of 2030. One of...

Countries in the world, especially in Indonesia, are increasingly concerned about greenhouse gas emission and energy crisis, causing it to be necessary to develop alternative clean energy and environmentally friendly. Biohydrogen obtained from biomass conversion can be the best alternative to overcome this problem. This paper was prepared to provid...

Pengembangan teknologi pengelolaan sampah yang juga menghasilkan energi adalah solusi permasalahan sampah serta energi berkelanjutan. Penanganan sampah belum memadai termasuk kendala lahan, sementara kapasitas sampah semakin bertambah. Penanganan sampah selama ini melalui Landfill Gas Collection dan Teknologi Termal dimana terdapat kendala lahan se...

Abstrak Ketergantungan terhadap bahan bakar fosil untuk pembangkit listrik di Provinsi Sulawesi Selatan masih tinggi yaitu sebesar 69% dari total kapasitas pembangkit. Pembangunan pembangkit listrik tenaga bayu (PLTB) merupakan salah satu cara untuk mengurangi ketergantungan pada bahan bakar fosil serta dengan meningkatkan kemampuan produksi energi...

Peraturan Daerah Provinsi Jawa Tengah Nomor 12 Tahun 2018 Tentang Rencana Umum Energi Daerah Provinsi Jawa Tengah mengamanatkan target pemanfaatan energi baru terbarukan (EBT) pada tahun 2030 sebesar 21,32%. Hingga tahun 2020 telah tercapai pemanfaatan EBT sebesar 11,89% sehingga diperlukan sebesar 9,43% untuk memenuhi target di tahun 2030. Salah s...

Dalam menyikapi fenomena tingginya emisi karbon di dunia, Pemerintah Provinsi Jawa Tengah turut berkomitmen untuk meningkatkan rasio pemanfaatan energi baru dan terbarukan (EBT) dengan target sebesar 21,32% pada tahun 2025. Sampai dengan tahun 2020 realisasi bauran EBT di Jawa Tengah baru mencapai 11,89%, sehingga masih perlu peningkatan sebesar 9,...

A heat exchanger is a heat transfer device that transfers heat between two fluids. One type of heat exchanger that is commonly used is a double pipe heat exchanger. This type of heat exchanger consists of a large pipe and a small pipe in it. Methods for increasing the effectiveness of the heat transfer process are of considerable concern, especiall...

Peraturan Daerah Provinsi Jawa Tengah Nomor 12 Tahun 2018 Tentang Rencana Umum Energi Daerah Provinsi Jawa Tengah mengamanatkan target pemanfaatan energi baru terbarukan (EBT) pada tahun 2030 sebesar 21,32%. Hingga tahun 2020 telah tercapai pemanfaatan EBT sebesar 11,89% sehingga diperlukan sebesar 9,43% untuk memenuhi target di tahun 2030. Salah s...

Boilers are one of the main equipment in the PLTU apart from turbines and generators. Each year there must be a difference in the actual boiler efficiency value with the conditions during commissioning. Periodically, boiler performance evaluations are carried out in order to identify losses from several factors. In this study, the method used for e...

Energy use always increases, especially fossil energy. Through the National Energy Policy, the government continues to strive to increase the role of new and renewable energy sources so as to reduce dependence on fossil energy. Solar power generation is a type of renewable energy generator that capable to convert solar energy to electric energy. Th...

This work focuses on exctracting ethanol from waste pomegranate (Punica granatum) and the experimental investigation of impact of various mixtures on emissions and engine performance. Ethanol is produced through the fermentation process of waste pomegranate fruits. Four combinations, namely E10, E15, E20, and E25, were prepared and tested for vario...

The authors would like to add the following Addendum to the affiliations of the authors of this article: D.Y.Dhandea D.V.Nighotb Nazaruddin Sinagac Kiran B.Dahea a Department of Mechanical Engineering, AISSMS College of Engineering, Pune, Maharashtra State 411001, India b Department of Engineering Sciences, AISSMS College of Engineering, Pune, M...

Sampah di Indonesia masih dianggap sebagai bahan sisa yang tidak diinginkan keberadaannya dan bukan sebagai sumber daya yang dapat dimanfaatkan. Hal tersebut dapat terlihat dari semakin banyaknya sampah yang menumpuk di tempat pembuangan akhir (TPA). Paradigma pengelolaan sampah selama ini yang bertumpu pada pendekatan akhir (end of pipe) sudah saa...

Permasalahan sampah di Indonesia masih banyak menimbulkan masalah sosial dan lingkungan, sehingga aplikasi teknologi yang mampu menangani tingginya volume sampah semakin mendesak untuk diaplikasikan. Solusi teknologi termal dalam penanggulangan sampah yang tersedia saat ini masih membutuhkan kajian kelayakan untuk dapat diterapkan di Indonesia. Sal...

In handling cargo, some types of ships have different ways. On gas tankers containing LPG, a special process is required in avoiding explosions in cargo tanks and avoiding the waste of cargo into the atmosphere. The process of handling the payload is the inerting porses on the payload tank. This process includes inert gas with oxygen levels of less...

A pump is a device used to move fluid from a lower pressure and/or position to a higher position. One example of a pump is an axial pump. Axial pumps are pumps that work by using the rotational motion of the blades and have a flow direction parallel to the axis of the shaft. Along with the development of the times, methods to improve pump performan...

In several previous studies, CFD (computational fluid dynamics) has been widely used to examine intake manifolds. From this, it is found that the fluid flow in the intake manifold can be fully developed, in this scientific paper an analysis will be carried out using the CFD simulation method, on the intake manifold of a 4-cylinder engine, to determ...

This research work deals with the application of response surface methodology and artificial neural network-based mathematical modelling of abrasive wear volume for a dry sliding wear of PTFE pin. The experiments were designed based on central composite design. The disc speed, load and sliding distance have been selected as parameters of the proces...

This work focusses on a novel technique of producing bioethanol from fermented pomegranate fruits waste by using Saccharomyces cerevisiae, commonly known as baker's yeast. Four different blends of bioethanol, namely PE10, PE15, PE20, and PE25 were experimented at various operating speeds. It was inferred that the addition of ethanol enhanced the co...

At present study, thermal performance of a double tube heat exchanger due to stream of air/water two phase flow through inner tube is experimentally studied. Air and hot water were mixed in a T-junction outside heat exchanger and then were followed into inner tube of heat exchanger. Told water flow rate was kept constant and was equal to 2 lit/min....

In present study, a 2D rectangular enclosure was considered as a latent thermal energy storage (LTES) system. Lauric acid was used as PCM material. The aim of this study was to use fins to enhance melting process of PCM. Position and shape of double fins were considered as investigating parameters. At first stage three different positions were cons...

Fin-tube is one type of heat exchanger that is commonly used because it has good heat transfer performance and efficiency. To improve the heat transfer performance on the fin-tube, it is carried out by using a vortex generator. The Vortex Generator induces a circular flow pattern to improve heat transfer. However, the problem that occurs is that th...

Abstract Vorticity causes many adverse effects on the area near the surface, both on moving (turbine blade) and fixed objects. Therefore, this study attempts to investigate the effects of free-stream turbulence on trailing edge vortex on the NACA 0015 airfoil profile. This research was conducted using two-dimensional numerical simulations. To deter...

Read Achievement of Nazar in Researchgate 23 NOvember 2020

We have had high expectations for using algae biodiesel for many years, but the quantities of biodiesel currently produced from algae are tiny compared to the quantities of conventional diesel oil. Furthermore, no comprehensive analysis of the impact of all factors on the market production of algal biodiesel has been made so far. This paper aims to...

Materi Kuliah Konversi Energi dan Sistem Pembangkit (PCEN8105) Program Magister Energi Sekolah Pasca Sarjana Universitas Diponegoro "First Law of Thermodynamics"

Materi Kuliah Konversi Energi dan Sistem Pembangkit (PCEN8105) Program Magister Energi Sekolah Pasca Sarjana Universitas Diponegoro "Basic Concept"

Materi Kuliah Konversi Energi dan Sistem Pembangkit (PCEN8105) Program Magister Energi Sekolah Pasca Sarjana Universitas Diponegoro "Energy Forms"

Inviscid Incompressible Flow

DImensional Analysis

Chapter-4

Dimensional Analysis

SAlah satu upaya untuk menurunkan emisi gas buang kendaraan bermotor adalah dengan menggunakan bahan bakar dengan nilai oktan atau cetane yang sesuai dengan yang dianjurkan oleh pabrik pembuat kendaraan. Oleh karena itu penggunaan bahan bakar dengan angka oktan yang tidak sesuai dengan spesifikasi kendaraan dapat meningkatkan, menurunkan atau tidak...

Disampaikan pada Dialog Publik yang diselenggarakan oleh Yayasan Lembaga Konsumen Indonesia Jawa Tengah dengan tema: “Mewujudkan Semarang Sebagai Kota Metropolitan Cerdas Berwawasan Lingkungan dengan Penggunaan BBM Berkualitas” Semarang, 17 September 2020