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All Journal Jurnal Polimesin
Hernawan Novianto
Politeknik Energi Dan Mineral Akamigas
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Optimization of the performance of the steam turbine SCSF-31.2" with 6 stages of axial exhaust in "X" geothermal power plant (PLTP "X") Hernawan Novianto; Zakiy Kamikho Harfy; Shultoni Mahardika; Sujono Sujono; Ayende Ayende
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3186

Abstract

The SCSF-31.2" 6-stage axial exhaust turbine in PLTP "X" is the main equipment for the power plant unit that functions to convert heat energy from steam into kinetic energy (rotation). Kinetic energy is transmitted by the shaft to the generator and then converted into electrical energy. The SCCF-31.2" 6-stage axial exhaust turbine currently operates at 7.95 bar (a) inlet pressure, 169.7 oC inlet temperature, and 112.504 kg/s steam mass rate. After evaluating the turbine performance with current actual operating data, the efficiency value is 78.8%, and it produces a gross generator power of 54.867 MW. The current efficiency value has decreased by 9.2% when compared to the initial condition. The decrease in efficiency is expected to occur due to an increase in temperature and pressure in the condenser. The temperature and pressure inside the condenser were initially at 40 °C and 0.074 bar (a) and are currently at 45.2 °C and 0.098 bar (a). Therefore, optimization is done by cleaning the channel sprayer in the condenser with the hope of increasing the water cooling flow rate and creating a wider contact area. As a result, the condenser temperature and pressure decreased so that the turbine efficiency value increased to 81.2% and the gross generator power increased to 57,224 MW
Experimental study on the performance of Peltier TEC12706 as a cooling and heating media Sujono Sujono; Hernawan Novianto
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5345

Abstract

The application of refrigeration spans a wide range of industries, from household needs to the oil and gas sector, employing various cooling methods. One rapidly developing approach is the use of Peltier devices, particularly the TEC1 12706 model, due to its compact size and widespread availability. It is essential for students to understand the application of Peltier technology, which necessitates the creation of practical tools for both educational and research purposes. Most existing research on Peltier devices focuses on air conditioning systems with fixed loads; therefore, it is imperative to explore their cooling and heating effects in dynamic environments. To address this gap, this study investigates the performance of Peltier modules as cooling and heating systems for moving media. A prototype of a cooling and heating module (heat pump) was developed using Peltier devices, and its performance was evaluated by varying the flow rates of hot and cold water (1.62/1.02; 1.2/0.8; and 0.9/0.68 L/min) and the number of operational Peltier elements (2, 4, 6). Calculations using the relevant formulas yielded the Coefficients of Performance (COP): COPc = 0.45, COPh = 1.37, and COPtot = 1.82. The results revealed that the cooling performance coefficient is lower than both the heating and total performance coefficients. Additionally, variations in flow rates and the number of installed Peltier devices showed minimal impact on cooling and heating performance coefficients.
Co-Authors Ayende Ayende Shultoni Mahardika Sujono Sujono Sujono Sujono Zakiy Kamikho Harfy