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All Journal Mechatronics, Electrical Power, and Vehicular Technology Teknologi Indonesia
Imam Djunaedi, Imam
Research Center for Physics, Indonesian Institute of Sciences
Computer Science & IT Electrical & Electronics Engineering

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CREEP LIFE ASSESSMENT OF HIGH PRESSURE FEED WATER HEATER (HPFWH) SHELL AT COAL FIRED POWER PLANT Alam, Hilman Syaeful; Djunaedi, Imam
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i2.125

Abstract

The creep life of high pressure feed water heater shell of coal-fired power plant has been evaluated using the fitness for service (FFS) assessment based on creep rupture life calculation. The purpose of this study is to determine the remaining life of the component due to prolonged exposure to high operating temperatures and loading conditions. The assessment procedures consist of level 1, 2, and 3, the operating time which is evaluated based on the designed life of the components, i.e. 25 years. Based on the assessment results using level 1, total creep damage does not meet the requirements because the operating life is below the 25-year designed life, equal to 219,000 hours. However, based on the results of level 2 assessment, the component successfully achieves the design life with remaining life of 204,042 hours. These results are consistent with the assessment results obtained by level 3, but the remaining life of the component is only 6,806 hours after operated for 25 years.
Investigation of Hydrogen Flow Uniformity in a Serpentine Separator Plate of a PEMFC Using Computational Fluid Dynamics Simulation Wahyu, Haifa; Oemry, Achiar; Djunaedi, Imam
Teknologi Indonesia Vol 35, No 3 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i3.189

Abstract

This paper presents an investigation on the uniformity of hydrogen flow in a separator plate of a Polymer Electrolyte Membrane Fuel Cell (PEMFC). Hydrogen is the main reactant of a PEMFC that fl ows within the separatorplate and into the MEA. Separator plates have fl ow fi eld lay out which is the determining factor for the uniform distribution of the gas. The separator plates used in this study has the shape of serpentine fl ow fi eld, taken from a 200 Watt PEMFC stack. The fl ow of hydrogen gas is simulated within the separator plate to analyse the pressure and velocity distribution which has a correlation with the fl ow fi eld design. The objective of the study is to determine flow uniformity within the separator plates by increasing the hydrogen gas pressure from 1 bar up to 3 bars. Although flow distributions for the three cases are similar and quite uniform, but the velocity in the plates was reduced when the hydrogen pressure was increased. This is due to the backpressure occurs as a result of resistance from the flow field and also the gas diffusion layer governing a fuel cell. From the experiments on the characterization of fuel cell stack, the best practice is to maintain the inlet pressure at low level, that is around 1 bar, which is in agreement with the current simulation results. The fl ow was simulated using commercial CFD package by employing Navier-Stokes method which is the governing equation of the computational fl uid dynamics (CFD) application. The results are compared to the steady output without random differences of an experimental running of the fuel cell stack.
Study on Performance Improvement and Economical Aspect of Gas Turbine Power Plant Using Evaporative Cooling System Alam, Hilman Syaeful; Sasso, John; Djunaedi, Imam
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 6, No 2 (2015)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (824.729 KB) | DOI: 10.14203/j.mev.2015.v6.97-104

Abstract

The study is intended to improve the performance of gas turbine engines in order to meet both electrical power demand and peak load in the power plant. In this paper, evaporative cooling system had been applied to improve the performance of gas turbine in Pesanggaran power plant in southern Bali Island, Indonesia. Moreover, the economic analysis was conducted to determine the capacity cost, operating cost and payback period due to the investment cost of the system. Based on the evaluation results, the power improvement for the three gas turbine units (GT1, GT2 and GT3) are 2.09%, 1.38%, and 1.28%, respectively. These results were not very significant when compared to the previous studies as well as on the aspects of SFC (Specific Fuel Consumption), heat rate and thermal efficiency. Based on the evaluation of the economic aspects, the reduction of production costs due to the application of evaporative cooling system was not economical, because it could not compensate the investment cost of the system and it resulted a very long payback period. These unsatisfactory results could be caused by the high relative humidity. Therefore, further studies are needed to investigate the other alternative technologies which are more suitable to the climate conditions in Indonesia.
Co-Authors Achiar Oemry Hilman Syaeful Alam John Sasso, John Wahyu, Haifa