UniMAP Conference and Proceedings
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PublicationTumble flows in gasoline direct injection engine-a study using particle image(Universiti Malaysia Perlis (UniMAP), 2009-10-11)This paper deals with the experimental investigations of the in-cylinder tumble flows in a motored single-cylinder internal combustion engine using flat and pentroof pistons at an engine speed of 1000 rev/min., during suction and compression strokes using particle image velocimetry. The two-dimensional in-cylinder tumble flow measurements and analysis are carried out in the combustion space on a vertical plane passing through the cylinder axis. To analyze the flow structure, ensemble average velocity vectors are used. Ts characterize the thumble flow, tumble ratio and average turbulent kinetic energy are made use of. At the end of compression stroke. pentroof piston showed an improvement in tumble ratio and average turbulent kinetic energy by about 41°'n and 103% compared to fla- piston. From the results, it is suggesting that the tumble flow enhancement is possible with pentroof piston.
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PublicationReduction of soot emission from diesel fuelled engine using a novel diesel particulate filter(Universiti Malaysia Perlis (UniMAP), 2009-10-11)Malaysia is a rapidly developing country that is working hard towards achieving its Vision 2020, of becoming a developed country. The increase in economic activities has also resulted to an increase in the country air pollution problem. One of the main sources of the pollutants is emissions from motor vehicles, which is originated from incomplete fuel combustion; either diesel or gasoline. Among the emissions that are considered to be harmful to human health and environment are carbon monoxide (CO), hydrocarbon (HC), nitrogen oxide (NOX), sulphur oxide (SOX) and carbon soot. Most emissions are equally contributed both gasoline and diesel fuelled vehicles. However, heavy duty diesel fuelled vehicles are the main contributor for the soot and NOX emissions. At present, in Malaysia, there is no regulation that forces diesel fuelled vehicles to be installed with exhaust after treatment system, which is able to reduce soot emission. In this paper, an overview on the control of emissions from diesel fuelled vehicles in Malaysia will be presented. In addition to that, description of a novel exhaust after treatment system, based on porous medium, which aims to suppress soot emission from diesel fuelled vehicles, is also be included.
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PublicationSimulation model of power quality provider(Universiti Malaysia Perlis (UniMAP), 2009-10-11)The quality of voltage and current delivered by the power utilities has become a major concern of the modern industries. These power quality problems are voltage sag and harmonic which can cause problems to the industries ranging from malfunctioning of equipments to complete plant shutdowns. In this paper, the proposed Quality Power Provider (QPP) modeled by simulation is able to compensate the power quality disturbances such as voltage sag and harmonics in the time of normal operation as well as performs its basic function during fault condition. The QPP has a unique and novel control which is able to track and extract the most common voltage disturbances fast, dynamic and simultaneously. As an experiment to verify and validate the performance, QPP is connected at a valorous point of typical sensitive simulated distribution network and different faults were created. Experimental results are demonstrated to prove the practicality of the mitigating device. The design, modeling and simulation is done using PSS/ADEPT and PSCAD software. The overall performance results showed that the Total Harmonic Distortion with QPP is 0.47 % as compared to 13.47 %. without QPP. The proposed QPP would increase the Power Quality ‘value added’ benefits to the system.
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PublicationPerformance of various distributor designs in a gas-solid fluidized bed(Universiti Malaysia Perlis (UniMAP), 2009-10-11)The applications of fluidization are far reaching. Some of the applications are combustion, gasification, drying, exfoliation and coating. However, only a few publications are available on fluidized beds that operate with Geldart Type-D particles and its respective distributors. This study focuses on fluidization of Geldart Type-D particles with three novel design of gas distributor, designated as Square Pitch Distributor (SPD), Circular Pitch Distributor (CPD) Semi-Circular Pitch Distributor (SCPD). The analysis of the results indicate that for the given bed characteristics, SPD shows better performance. Lower pressure drops and better fluidization uniformity are obtained. The distributors are perforated plate type with 4 mm holes, giving a total open area ratio of 13%. The holes are laid out in square and circular pitch of 10 mm. The bed was filled with Geldart D spherical PVC particles with a mean diameter of 5.87 mm and a density 858.8 kg/m³. Experiments are conducted by using superficial velocity up to 7.2 m/s and the range of particle loading is 0.5 kg to 2.0 kg. The pressure drop across the bed is measured by a digital manometer and the fluidization quality is assessed through physical observation. The maximum bed pressure drop values obtained for the distributors are 0.4122 kPa for SPD, 0.463 kPa for CPD and 0.5138 kPa for SCPD, with minimum fluidization velocities of 3.475 m/s, 3.588 m/s and 3.492 m/s respectively. In conclusion, SPD is found to have the best hydrodynamic characteristics and is most suited for use in gassolid fluidized beds.
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PublicationExperimental investigation of irreversibility in components of an experimental power plant(Universiti Malaysia Perlis (UniMAP), 2009-10-11)The objective of this research is to evaluate the irreversibility in components of an 8 kW experimental power plant working in the Rankine cycle including boiler, turbine, condenser and feed water tank. In this research, the effect of different operating conditions such as boiler pressure and output work on the irreversibility of components was investigated. Based on the results, it was found that the percentage ratio of exergy destruction to the total exergy destruction is maximum in the boiler system and minimum in the feed water tank.