Mustain A.,State Polytechnic of Malang |
Hartanto D.,State University of Semarang |
Altway S.,Sepuluh Nopember Institute of Technology
ARPN Journal of Engineering and Applied Sciences | Year: 2016
The extended binary interaction parameters of vapor-liquid equilibrium for alcohols binary mixtures were obtained. A total of 23 systems that consisted of isobaric vapor-liquid equilibrium data at 101.325 kPa were selected. The extended binary interaction parameters were fitted simultaneously by correlating the selected vapor-liquid equilibrium data with the Wilson, Non-Random Two-Liquid (NRTL), and Universal Quasi-Chemical (UNIQUAC) activity coefficient models. The extended binary interaction parameters were described as the temperature-dependent binary interaction parameters to increase the capability of the parameters for the application in wide range of temperature. The obtained parameters were very useful to calculate vapor-liquid equilibrium for designing and optimizing the distillation column in the alcohol separation process. © 2006-2016 Asian Research Publishing Network (ARPN).
Syamsiana I.N.,State Polytechnic of Malang |
Putri R.I.,State Polytechnic of Malang
Proceedings of the 2011 International Conference on Electrical Engineering and Informatics, ICEEI 2011 | Year: 2011
PEF is the newest non thermal technology for liquid and semi-solid food processing system. Based on previous researches, PEF has the advantage of maintaining better nutritional products, compared with the thermal system. PEF pasteurization requires a high voltage pulse generator that produces electrical shock. Some researches had been conducted to develop a generator circuit which has high efficiency and pulse wave that can be used in the PEF technology. The circuit of a high-voltage pulse generator can be designed either from Resistor-Capacitor (RC) circuits or Resistor-Inductor-Capacitor (RLC) circuits. The high-voltage pulse generator with high voltage transformer used in this paper will be controlled by microcontroller ATMEGA 8535. The paper also explores the design of a high-voltage pulse generator which is equipped with voltage regulation that can be set through the key pad. Constant high-voltage pulse frequency is applied and is controlled by ATMEGA 8535 microcontroller. Chamber is designed as a Tube-shaped chamber with a pasteurized apple juice capacity of 1.5 liters. The high voltage transformer used in this paper is a step-up transformer with a maximum output of 100KV. The designed equipment is expected to produce high voltage in range of 20KV to 100KV with an increase scale of 20KV. The examination result shows there was an error between the expected and the real output voltage from the device/equipment. The average error of this equipment is 5.41% and the smallest error on 60KV output voltage is 0%. This paper also carried out tests on the vitamins A and C content in apple juice to investigate the effectiveness of the designed equipment compared with thermal pasteurization. The content of vitamins A and C in apple juice resulted from PEF pasteurization is remain unchanged. This can be seen from the content of vitamin A. Before pasteurization, the content was about 0.5034g/gr and after pasteurization treatment using PEF, the content lies between 0.3676 and 0.435μg/gr, while pasteurization thermal treatment cause the content become 0.23μg/gr. In general, the PEF treatment will cause the content of vitamin A decrease although it is not significant. A significant decline emerged from apple juice which was pasteurized by heat. The heating process causes a degradation of vitamin A content. Meanwhile, for the content of vitamin C, it was about 0.5034μg/gr before pasteurization treatment and it lies between 11.25 - 18.95 mg/100ml after pasteurization treatment using PEF and thermal pasteurization is 4.00 mg/100ml. © 2011 IEEE.
Purwono B.S.A.,State Polytechnic of Malang |
Suyanta,State Polytechnic of Malang |
Rahbini,State Polytechnic of Malang
Energy Procedia | Year: 2013
The purpose of this paper is to analyze the dominant factors using the biogas-digester in the poor villages as an alternative energy. The method of analysis is Qualitative approach. Using the informen or participants of ten people from BPPT and the people (farmers) who live in Gondosuli village - Pasuruan, this research finds that there are five dominant factors namely local wisdom, the spirit of championship, government financial support, green technology and strong informal leaders. The spirit of championship will produce anything that we will construct and implement in poor villages easily. The findings of the study are useful for administrators, project managers, and practitioners. This research does not discuss the business ethics, values, and the external and internal factors. This paper is a part of the research report which is financed by Ministry of National Education and Culture - Republic of Indonesia. © 2013 The Authors. Published by Elsevier Ltd.
Radianto D.,State Polytechnic of Malang |
Asfani D.A.,Sepuluh Nopember Institute of Technology |
Syafaruddin,Hasanuddin University |
Hiyama T.,Kumamoto University
International Review of Automatic Control | Year: 2013
This paper presents a new approach of maximum power point tracking (MPPT) for partial shaded total cross tied (TCT) photovoltaic array based on fuzzy logic controller. The proposed method employs MPPT based on fuzzy logic controller comprising two inputs coming from voltage and current sensor. In addition, the photovoltaic array uses total cross tied configuration (TCT) in which it is superior to other configuration such as serial (S), parallel (P), and serial-parallel (SP) configuration. Here, TCT configuration consists of 10 photovoltaic modules by using 5×2 arrangements. Meanwhile, the fuzzy logic controller itself is used to drive boost dc-dc converter through pulse width modulation (PWM). The comparative study of two topologies, TCT (without fuzzy control) and proposed TCT (using fuzzy logic control) is carried out in MATLAB using SIMULINK, Fuzzy Logic Toolbox, and Power System Toolbox. The simulation result shows that TCT photovoltaic array using fuzzy logic controller (FLC) provides both higher power compared with TCT photovoltaic array without fuzzy logic controller. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.
Saroso H.,State Polytechnic of Malang |
Wardana I.,Brawijaya University |
Soenoko R.,Brawijaya University |
Hamidi N.,Brawijaya University
Advanced Studies in Theoretical Physics | Year: 2013
Burning characteristics of coconut oil vapor-air premixed combustion has been studied experimentally. This study was conducted using Hele-Shaw cell of 50cm × 20cm × 1cm. Coconut oil in this study has the composisiton of 12% glycerol and 88% fatty acid (consisting of 18.77% caprylic acid, 15.15% capric acid, 41.78% lauric acid, and 11.86% myristic). The combustion propagation direction was varied by igniting from top or from bottom. Flame propagation was observed at various equivalent ratios (φ) of 2.73; 2.57; 2.34; 2.19; 2.03; 1.93 and 1.78. The results show that coconut oil tends to be degraded into fat and glycerol because of hydrolysis reaction. Fatty acid is burned before glycerol. Fatty acid tends to produce separated flames of different boiling points and molecule weights. The process of energy release from glycerol needs high rate of combustion process and it tends to slow flame propagation and causes micro explosions. The flame propagating downward at φ = 2.73; 2.57 and 2.34 show orange flames that cause moderate micro-explosions. At φ = 2.19; 2.03 and 1.93, the flames are blue-green, causing strong microexplosions. At φ = 1.78 the flames are dark purple, causing weak micro-explosions. For flame propagating upward, only at φ = 2.03, the micro explosions can be seen clearly since the thermal expansion is high and the flame propagates fastest. © 2013 Hadi Saroso et al.
Ronilaya F.,State Polytechnic of Malang |
Miyauchi H.,Kumamoto University
International Journal of Emerging Electric Power Systems | Year: 2014
This paper presents a new implementation of a parameter adaptive PID-type fuzzy controller (PAPIDfc) for a grid-supporting inverter of battery to alleviate frequency fluctuations in a wind-diesel power system. A variable speed wind turbine that drives a permanent magnet synchronous generator is assumed for demonstrations. The PAPIDfc controller is built from a set of control rules that adopts the droop method and uses only locally measurable frequency signal. The output control signal is determined from the knowledge base and the fuzzy inference. The input-derivative gain and the output-integral gain of the PAPIDfc are tuned online. To ensure safe battery operating limits, we also propose a protection scheme called intelligent battery protection (IBP). Several simulation experiments are performed by using MATLAB®/SimPowersystems™. Next, to verify the scheme's effectiveness, the simulation results are compared with the results of conventional controllers. The results demonstrate the effectiveness of the PAPIDfc scheme to control a grid-supporting inverter of the battery in the reduction of frequency fluctuations. © 2014 by De Gruyter 2014.
Wang Y.,Northumbria University |
Ronilaya F.,State Polytechnic of Malang |
Chen X.,Northumbria University |
Roskilly A.P.,Northumbria University
Applied Thermal Engineering | Year: 2013
Electrical consumption in a household is not stable but changeable in one day throughout a whole year. The consumption depends on weather, seasons and users. This characteristic of demand makes it difficult to design and build a distributed power generation system to meet the demand for a household. For this reason, a stand-alone distributed power generation system (DPGS) needs to be carefully designed not only to meet the dynamic household electricity demand, but also to be economical. Hence, for a DPGS, it is essential to utilise electrical energy storage (EES) unit to store the excessive energy while power generation is running at off-peak time; and then the EES may supply the stored energy during the peak demand period. This study investigates a distributed power generation system with an electric energy storage unit to meet the dynamic electricity demand in a household. The system composes of one diesel-engine-generator (DG) running with biofuel; a fuel cell; integrated with an energy storage unit including a supercapacitor and a group of batteries. Models have been set up in Dymola software and two different system configurations are proposed and simulated. The characteristics of the integrated DPGS-EES system are presented and discussed. The results show that both configurations are working properly to meet the demand. © 2012 Elsevier Ltd. All rights reserved.
Purwono B.S.A.,State Polytechnic of Malang |
Rahbini,State Polytechnic of Malang |
Salim U.,Brawijaya University |
Djuwahir,Brawijaya University |
Energy Procedia | Year: 2015
The objective of this research is to reduce the research variables to be dominant factors. The research variables are Raw Material Handling, Raw Material Machining and Purchase Processing, Finished Product Warehousing, Finished Product Distribution, Training Program Operator, Financial Report, Operator's Skills Development, Processing Technology, Raw Material Testing Laboratories, Selection of The Technology, Manufacturing Technology, Budgeting, Regulation Improvement, Concerning Ecology, and "Creating" the New Market Share. The respondents of this research are the regulators, the producers, the end-users, and farmers. The number of respondents is 113 people with 15 research variables and is reduced by using Factor Analysis. The finding of this research reveals, the more we use of environmentally friendly processing technologies or using green technology, "Creating" a new market and regulation, Financing by state budget, Distributing products, and Handling Material will increase the capacity of bio-energy production or wealth creation. © 2015 The Authors. Published by Elsevier Ltd.
Putri R.I.,State Polytechnic of Malang |
Wibowo S.,State Polytechnic of Malang |
Rifa'i M.,State Polytechnic of Malang
Energy Procedia | Year: 2015
Solar energy is a potential energy source in Indonesia. A photovoltaic is needed to harvest this kind of energy, and to be able to gather the most, the PV must have a good efficiency. The maximum efficiency is achieved when PV works at its maximum power point which depends on irradiation and temperature. Since the irradiation and temperature always change with time, a PV system which able to track the maximum power point needs to be developed to produce more energy. This research was aimed to explore the performance of a maximum power point tracking system which implements Incremental Conductance (IC) method. The IC algorithm was designed to control the duty cycle of Buck Boost converter and to ensure the MPPT work at its maximum efficiency. The system performance of IC algorithm was compared to widely used algorithm - Perturb and Observe (P&O) on a Simulink environment. From the simulation, the IC method shows a better performance and also has a lower oscillation. © 2015 The Authors. Published by Elsevier Ltd.
Wahyudi B.,State Polytechnic of Malang |
Wahyudi B.,Brawijaya University |
Soeparman S.,Brawijaya University |
Hoeijmakers H.W.M.,University of Twente
Energy Procedia | Year: 2015
The conventional Savonius turbine is a good concept for small size wind-renewable energy systems; unfortunately always it has low efficiency. Inspired from the Savonius Blade, this research project designed the diffuser form as compartment between S blade and Tandem Blade of Savonius to produce "jet flow" through narrow gap on the advancing blade in order to rotate more powerful the returning blade. The reason to change the air (wind) by using water as working fluid is to increase the body force (BF) which works on the blade due to increasing the density of fluid. The new model of Hydrokinetic Cross Flow Vertical Axis Turbine (CROSSVAT) is developed from Savonius S rotor with using Savonius Diffuser Blade (SDB) and moving deflector (guide blade). The function of SDB is to increase the velocity ratio on narrow gap (Rcv) also the drag force on surface of blades. Research method used the CFD simulation and Response Surface Method (RSM) to optimize the geometry of tandem blade and moving deflector (the moving guide blade). This study results two model CROSSVAT rotor using Tangential Deflector (model 1) and Radial Deflector (model 2). © 2015 The Authors. Published by Elsevier Ltd.