Slamet Wahyudi

University of Brawijaya · Department of Mechanical Engineering

This paper investigates the impact of electrical load management on reducing exhaust gas emissions in Landing Platform Dock (LPD) class vessels. The study focuses on the implementation of Integrated Fully Electric Propulsion (IFEP) systems and Variable Speed Drives (VSD) to enhance energy efficiency and minimize environmental impact. The convention...

The maritime industry significantly contributes to global air pollution, particularly through ship waste emissions. This paper assesses and analyses the impact of these emissions on environmental air quality. It highlights the types of pollutants emitted, their sources, and the potential measures to mitigate their adverse effects. The study integra...

Electric motors as the main booster for ships are widely used in submarines. But now, it was used in the Navy Ships type of Xyz Class. In the world, there are quite a several warships that use electric motors as the main propulsion engines because they have high efficiency, especially in terms of maintenance budget requirements and fuel budgets. On...

This paper proposes a design and implementation of an axial type magnetic gear (MG)based on the composition of the magnetic arrangement. We report a quantitative comparison of twoMG topologies with rectangular magnets arranged in series and parallel. Increased magnetic fluxis done through magnetic circuit analysis and electrical circuit approach. T...

Biogas adalah salah satu energi alternatif yang mempunyai nilai ekonomisnya besar teruntuk masyarakat pedesaan. Dalam prakteknya kandungan CH4 biogas menjadi bagian terpenting untuk proses konversi energi namun zat pengotor berupa karbondioksida yang menurunkan nilai kalor masih besar. Sehingga diperlukan upaya untuk menurunkan CO2 dengan proses pu...

The paper studies power losses in transformers due to non-linear loads. The research aims to analyze the power loss in a single-phase dry transformer under a non-linear load. The research uses an SW43W Power supply type, FlukeView Power Quality Analyzer as a DC or AC power supply on the primary side of the transformer. The non-linear load is connec...

In this research, microstructures, thermal and electric properties of thin-film bismuth vanadium oxide as an anode for water electrolysis were presented. The anodes needed are obtained by centrifuging the indium thin oxides with BiVO4 powder. In order to determine the crystallinity and morphology of BiVO4, the following measurements were made: XRD,...

The preparation of BiVO4-NiO of microstructures and electric properties has been done using water solution and coated with indium tin oxide (ITO). BiVO4-NiO material was prepared using BiVO4, NiO powders and ITO. Mixing and coating processes were held using water and the resulting paste was coated by screen printing using a small glass stick on an...

Climate change is a serious threat to the environment and socioeconomic globally. Climate change is caused by natural processes and due to human activities that have resulted in long-term climate fluctuations and even globally over the past few decades, the climate has experienced a fairly rapid rise in average temperatures. Climate change is mainl...

The purpose of this study is to attempt to increase the efficiency of LPG stoves by using an ember element made of woven nickel wire arranged in layers. It is supposed that high-temperature embers can burn more fuel around the wire, thereby increasing the area of complete combustion. Testing was conducted by means of a Water Boiling Test (WBT) and...

The objective in this study was to construct a finned heat radiation reflector using a cut cone-shaped stainless steel plate. In addition, its efficiency was examined by the water boiling test by varying the fin rows and angles. Measurements were performed on reflectors with one, two and three rows of fins, which were compared with conventional sto...

The CO2 content in biogas is an impurity, so it needs to be reduced. One way to reduce the levels of CO2 in biogas is by purification with tile-zeolite adsorbents. The purpose of this study was to determine the use of tile - zeolite as an adsorbent in the purification process to reduce CO2 levels using a 23 factorial design. The use of tile powder...

The study to investigate the thermal performance of solar cooker using a spot Fresnel lens for concentrators of solar thermal energy is conducted. The main objectives of the present work are: a) to develop a new design of the cooking pot of solar cooker as an absorber of solar thermal from a spot Fresnel lens; b) to analyze the relationship of sev...

The paper discusses the comparison of the performance of steam generators in large and small receivers, using a Fresnel lens concentrator. The goal is to get the best value from the efficiency of a steam generator between large and small receivers, with the following task details: a) design a conical cavity receiver that has the most efficient...

The Micro hydro power plant (MHPP) development can be used to supply electricity to people living in remote areas. Because the electricity needed in this area is usually not too big. In remote areas and located far from the electricity transmission network, electricity supplies from small capacity power plants is needed, especially those that utili...

The dynamics of fluid flow are very important to the process of converting water energy into mechanical energy at the nozzle double runner cross flow turbine blade. Fluid dynamics of a jet of water from a nozzle release energy as the water crosses the cross flow turbine runner. This research aims to improve turbine performance and the effectiveness...

Research on energy storage technology is an interesting topic, especially in Small Scale Compressed Air Energy Storage (SS-CAES) which is considered more environmentally friendly and does not have degrade over time such as other energy storage technologies. To generate the power in SS-CAES, it is by adjusting the rotation speed of the generator to...

Hydropower plants are a form of renewable energy resources, which comes from flowing water. The turbine is used to drive the generator then convert mechanical energy into electrical energy. The turbine wheel is located inside the turbine housing and the turbine wheel rotates the power shaft. One of the most used turbines is a cross-flow turbine. Th...

Kinetic energy is the energy produced due to the river water flow speed. This water speed energy can be effectively implemented as a rural power plant. This research has been carried out experimentally and the research is under a laboratory scale research. The turbine tested is a vertical shaft kinetic turbine equipped with eight blades. This study...

The purpose of this study is to analyze the magnitude and duration of shear stress in normal endothelial cell (HUVECs) cultures and those exposed to supraphicological glucose which affected synthesis and release of NO detected by bioassay techniques. The results of this study concluded that large shear stress applied to endothelial cell culture for...

The purpose of this study is to determine the effect of the power supply current on recast layer on S45C steel cutting using wire EDM. In this research, the process of cutting workpieceused Mitsubishi Wire EDM Machine BA-8. Brass wire electrodes used Ø 0.2 mm and work piece material S45C 22 mm. The workpiece was cut into a circle to get 20 mm diame...

Characteristics of magnetic-gear axial using 4 rectangular NdFeB magnetic layers mounted on acrylic disks have been studied experimentally. The goal is to reduce the use of NdFeB magnets to be more economical compared to other magnetic gear designs. The magnetic gear axial topology made was different from the magnetic gear that had been made by the...

This study presents the strategy of controlling the air discharge in the prototype of small scale compressed air energy storage (SS-CAES) to produce a constant voltage according to the user set point. The purpose of this study is to simplify the control of the SS-CAES, so that it can be integrated with a grid based on a constant voltage reference....

A Cross flow turbine is a most beneficial prime mover, compared to waterwheelsand other micro hydro turbines, to convert water potential energy into mechanicalenergy as an electric generator prime mover. A cross flow turbine has a nozzle thatfunctions to spray the water, converts the water potential energy into kinetic energy,directs the water jet...

Conventional heat transfer system is unable to absorb heat well. Various methods have been done to enhance heat transfer. One of them is the method by using nanofluid which has been done by many researchers; due to the better thermal performances compared to base fluid. The research aims to observe the enhancement of convective heat transfer and pr...

It has been known from the previous researchers that the use of the heat radiation reflector can improve the efficiency of the LPG stoves. Based on the radiation theory, the radiation energy is emitted radially in all directions. Therefore, a kind of method to guide the heat radiation is required to minimize the heat losses. One of the method is to...

This research was conducted to analyze the spray combustion ratio of Kapuk Seed Oil (KSO) and Jatropha Oil (JO), with combustion length, combustion width, RGB color and combustion stage as the parameters using video camera with 420 fps speed in a spray and nozzle tester with a pressure of 2100 psi. The results of the comparative analysis showed tha...

This paper proposes a design and implementation of an axial type magnetic gear (MG) based on the composition of the magnetic arrangement. We report a quantitative comparison of two MG topologies with rectangular magnets arranged in series and parallel. Increased magnetic flux is done through magnetic circuit analysis and electrical circuit approach...

This study describes the analysis of the effect of using a dual nozzle toward the Cross flow turbine performance. The dual nozzle used is mounted on a horizontal and a vertical position, round-shaped cross-section and serves to direct water jets entering the turbine runner blades and convert the water potential energy. The purpose of this study is...

This study is aimed to analyse the comparison of the spray combustion using kapok seed oil and jatropha oil through the combustion length, combustion width and combustion stage by using a video camera with the speed of 420 fps in the spray nozzle tester with a pressure of 2,100 psi. The result of the comparative analysis showed that the spray combu...

This paper presents a new concept for air-conditioning systems in Liquefied Petroleum Gas (LPG) fuelled vehicles, a ½ cycle refrigeration system. Prior to being used in an engine as a fuel, LPG serves as a refrigerant. Harvesting of cooling from LPG was carried out by an auxiliary evaporator. Initially, to evaporate LPG in an Original Equipment Man...

Over fuel consumption and increasing in CO2 emissions are problems as compensation from the imposition of automobile A/C systems. Another problem is the extreme temperature when the car is parked under sunlight so that the thermal load becomes very large when A/C is turned on. Therefore, this article presents various methods to overcome the problem...

Alternative energy sources are essentially inexhaustible for the foreseeable future, alternative energy is not only needed but to the energy transform from one form of energy to another form of energy without creating pollution that would damage the nvironment. One of these is the water potential energy, especially from rivers. In Indonesia especi...

Untapped water potential was found across Indonesia. Major rivers in Kalimantan and Sumatra, as well as smaller rivers elsewhere in the country contain rich potentials. Generally, there are opportunities to develop kinetic turbines, especially for areas not yet reached by electricity. Response Surface Methodology is a set of mathematical and statis...

Over fuel consumption and increased exhaust gas due to the A/C system have become a serious problem. On the other hand, the LPG-fueled vehicle provides potential cooling from LPG phase changes in the vaporizer. Therefore, this article presents the potential cooling effect calculation from 1998 cm3 spark ignition (SI) engine. A numerical study is us...

Briquettes mixture of peat and charcoal leaf midrib palm oil is one of the alternative energy for replacing fossil fuel energy. It is environmentally friendly and abundant in Indonesia, mainly in South Kalimantan. In this study, the percentage of briquettes mixture of peat and charcoal leaf midrib of palm oil were 50%:50%, 60%:40%, 70%:30%, 80%:20%...

Some studies have been done on utilizing biomass from agriculture such as the leather and shell of rubber (Hevea brasiliensis) were not used optimally in Indonesia as an alternative energy which developed by making biobriquet to achieved the higher energy that could be used in the combustion process. In this study, the biobriquet was made of the le...

This work present the investigation LPG composition during discharging process from LPG fuel tank

The aim of this study is to identify the value of compounds contained in liquid coal by using Fourier Transform Infra-Red (FTIR) and Differential Scanning Calorimeter (DSC). FTIR was used to analyse the components contained in liquid coal, while the DSC is done to observe the heat reaction to the environment. Based on the Fourier Transform Infra-Re...

Research and development activities on Liquefied Petroleum Gas (LPG) vehicles have increased LPG engine performance to that of gasoline engines. LPG evaporation in the fuel system also has a potential cooling effect that can be taken advantage of. The results from previous studies, however, do not explain the level of fuel in the tank at the time o...

In Indonesia, the use of liquid petroleum gas (LPG) in vehicles has been promoted through government policy since 1988. However, the progress has not significantly run. Therefore, this paper presents the techno-economic analysis of LPG as road vehicles fuel alternative in comparison with gasoline RON 88 and RON 92 for public transportation in Indon...

The important matter of mixing at both micro and macro-fluidic levels has to be studied for determining how to achieve proper stirring ways. In order to analyse this matter, the first problem was how to visualise and especially how to measure the stirring process in a certain flow. In this study, the behavior of viscous glycerin employing various s...

The experimental study was intended to investigate characteristics of the cross flow turbine based to the three models designed on the same runner diameter with different runner length of each. The Flow rates were measured by magnetic flow meter, the forces were detected by using spring balance and turbine speeds were detected by tachometer. The pe...

This paper aims to study the windmill Savonius with multi-deflector. Multi-deflector placed around the windmill, which aims to reduced negative torque to the returning blade and directing the flow of wind to the advancing blade . CFD analysis with ANSYS software. The initial conditions with variation wind speeds 3, 4, 5 and 6 m / s. The result indi...

The negative influence of fossil fuels and the limited supply of fossil fuels to encourage researchers are looking for alternative fuels to renewable energy, namely coconut oil and jatropha oil. The purpose of this study was to determine the ratio of the combustion flame spray on burning long, wide combustion and combustion stage by studying the ex...

Experimental studies of the Archimedes screw turbine are applied as a micro hydro power plant for low head focused on the fluid flow. Fluid flow on a screw turbine is not completely filled water flow there is still a free surface between the water fluid and atmospheric air. Except the screw geometry, the turbine screw free surface allows the flow p...

Biogas is an alternative energy source that is sustainable and renewable containing more than 50% CH4 and its biggest impurity or inhibitor is CO2. Demands for replacing fossil fuels require an improved fundamental understanding of its combustion processes. Flammability limits and laminar burning velocities are important characteristics in these pr...

Fluid movement of liquid through a pipe arch supported by a drop in pressure caused by the inertia of the fluid and the secondary flow across the pipe bends. For Newtonian flow, pressure gradient near the wall area is the trigger for the secondary flow. Bend pipe has a value greater than the pressure drop due to the straight pipe geometry and track...

Many modifications have been made on conventional Savonius wind turbine's rotor blades have been made to improve the performances. The rotor blade modification in this research is a blade combination where the circle-shaped conventional model is combined with the one of a concave elliptical model. The combined blade will not affect the simplicity o...

A Cross flow turbine is the most popular micro power plants because of the simple construction, reliable, but until to now, the turbine performance is still low compared with other water turbines. The purpose of this study was to examine the increase of the cross flow turbine with a dual nozzle as a hydro power generation performance. The research...

The study of Archimedes screw turbine as a micro-hydro power-plant is being developed in this decade. Screw turbine has some advantages, namely no need draft-tube, fish-friendly, and can be operated in low head (H < 10 m). The aim of this research is to recognize the performance of Archimedes screw turbine due to flow rate effect and its slope and...

Energy crisis which is globally occured around the world attract researchers to study renewable energy. Experimental study of Archimedes screw turbine that had been applied as microhydro power plant for low head, they are focused on fluid flow. Fluid flow on Archimedes screw turbine is a flow with a free surface. Froude Number is utilized for this...

Rapid technological advances require electrical energy for its operations and human needs fulfillment. Water energy is abundant in nature and could be used as an electrical energy source. The cross flow is most widely applied as micro-hydro power plants because it can operate at low head, a small water discharge, simple in construction, easy and in...

This paper aims to improve the performance of Savonius rotor with the addition of guide vanes. Guide vanes with angle of 45° against tangent are placed around the rotor with the aim of reducing the negative torque to the returning blade. Guide vanes are used with variations in the number of 4, 8 and 16. The analysis was conducted by simulation usin...

Liquefied Petroleum Gas vehicles (LPG Vehicles) provide a potential cooling effect about 430 kJ/kg LPG consumption. This cooling effect is obtained from the LPG phase change from liquid to vapor in the vaporizer. In the existing system, energy to evaporate LPG is obtained from the coolant which is circulated around the vaporizer. One advantage is t...

Solar energy is one of the most promising renewable energy resources, which is available in most of the developing countries including Indonesia. The Solar thermal concentrator are used to capture solar radiation and In this regard, the direct normal irradiance can be concentrated into heat for diverse applications. The PMMA (polymethyl-methacrylat...

The performance of premixed micro-combustion in the cylindrical micro-combustors is discussed in this research paper. In this investigation, three types of micro-combustor having different parameter value of Area ratio (surface area to cross-sectional area of the chamber) were tested. A premixed fuel is used in this research which is composed by LP...

The penetration of wind turbine into the existing grid is increased during the past decades. The direct-drive variable speed, Full Converter Wind Energy Conversion System (FCWECS) was taking about 3500 Units of the whole installed wind turbines in 2014. In this paper, Superconducting Magnetic Energy Storage (SMES) Unit based on Hysteresis Current C...

Archimedes screw applications as water turbine is being developed and researched in the past decade. This kind of turbine excellence is that it can operate at a low head (H <10 m) and does not require a penstock. The screw turbine performance is influenced by the turbine screw shape geometry and the flow characteristics in the screw turbine. This s...

In this study, the behavior of glycerin nitration reactive mixing employing continuous and non-continuous stirring patterns was investigated. The changes in nitration of glycerin were observed by means of a color change technique based on a fast nitration reaction arising from continuous stirring patterns (RUN 1 and 2) and non-continuous stirring p...

Although the complex problems experienced by large industry can be solved, the world is still suffering from a lack of energy. The problem is particularly felt in developing countries where people livein villagesand requires the development of a more efficient energy sources. The more expensive and limited fossil fuel, makes hydropower become the b...

Water potential sources as an alternative energy basically will never run for the foreseeable future.This alternative energy is needed and one of them is a power generation especially for rural areas. There are a lot of water energy sources in Indonesia, especially energy sources from river water flow. One of the very large potential water flow ene...

The purpose of this study was to observe the chemical compounds composition in coal after a liquefaction process. Based on the test results, it is obtained some of the compounds contained in liquid coal. The dominant compound is Naphthalene, benzene and methyl groups. This compound is a hydrocarbon compound which allows to be used as a fuel.

Premixed Micro-combustion Micro Combustor Area to Volume Ratio Temperature Distribution Numeric Simulation Premixed Flame ABSTRACT A micro combustor is one of important devices in heat generation to power miniaturized products such as microrobots, notebook computers, micro-aerial vehicles and other small scale devices. An integrated micro combustor...

Solar thermal energy is a promising option capable of being one of the alternative energy sources for cooking. It is cheap compared with other forms of cooking, and beneficial for areas with abundant sunshine (for example Indonesia). The development of solar cooker would help in conservation of conventional fuels, LPG, kerosene, electricity and coa...

Availability of fossil fuels in the world decrease gradually due to excessive fuel exploitation. This situations push researcher to look for alternative fuels as a source of renewable energy, one of them is kapok (ceiba pentandra) seed oil. The aim this study was to know the behavior of laminar burning velocity, secondary Bunsen flame with open tip...

Abstrac t There are many small industry y that manufacture parts and accessories two-wheeled. Production process of parts and accessories has been done in the welding process . Welding is a common method used to connect the metal permanently. The results of observation on welding process identify there are many problems faced by operators of weldin...

Continous improvements to increase productivity is compulsory for small medium enterprise. The average value of productivity observed with Objective Matrix, in January-September 2014, is 261 . The main factorwhich affect the value of productivity is the number of defective products produced by Automatic Feeding and Sealing Machine.Approximately, 73...

This study investigates the variation of sulphuric acid concentration, temperature, and time towards the corrosion rate of saramet using response surfacemethod. Method used in this study is true experimental research. Sarametis material which is included into type of austenitic stainless steel which contains high amount of silicon. Starting at thes...

Mixing processes are best understood in turbulent flows, where, ironically they are only understood in a statistical sense. Similarly, detailed analysis of the mechanisms of the realistic mixing process in deterministic laminar flows is nearly absent from literature. This experiment was implemented to investigate the comparable performance of react...