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INDONESIA
Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 5 Documents
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Search results for , issue "Vol. 23 No. 2 (2008)" : 5 Documents clear
STUDI BLOCKAGE EFFECT TERHADAP ALIRAN PADA KONFIGURASI WING-BODY FAIRING Khoiri Rozi; Herman Sasongko
Mesin Vol. 23 No. 2 (2008)
Publisher : Mesin

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Abstract

The study was performed to acquire information on the qualitative flow condition and dynamical blockage effect on wing-body fairing configuration. The study was used to computational fluid dynamics to provide the pathlines patters and the total static pressure distribution in the vicinity junction region. Results of study in the research indicated that flow pattern influences by variation of angle of attack. As increasing of angle of attct so that the saddle point position move in to pressure side and away from wing surface. Meanwhile, separation line or imprint horseshoe vortex due to increasing angle of attack became more than opened. Results of total static pressure distribution show that the blockafe effect area seems deeply on incoming trailing edge location. Therefore, as increasing of angle of attack will be blockage effect to fluid flow on pressure side and suction side stronger.
PENGEMBANGAN PERSAMAAN KORELASI PENDIDHAN KOLAM UNTUK REFRIGERAN HIDROKARBON Ari Darmawan Pasek; Willy Adriansyah; Hery Hery; Hengky Leo
Mesin Vol. 23 No. 2 (2008)
Publisher : Mesin

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Abstract

Hydrocarbons (HC) are considered as the alterative substitutes of CFC and HCFC refrigerants. Using it as new refrigerants needs a complete knowledge of its characteristics. One of them is the boiling heat transfer coefficient. Series of experiments were carried out to investigate this characteristics. Experiments had been carried out with R-12 (CFC) and R-22 (HCFC) and their substitutes, HC-12 and HC-22. Tested refrigerant was conditiond at a saturated state and an electric heater immersed in the refrigerant pool of liquid was used as the boiling surface. Boiling heat transfer coefficient is determined as the ratio between the heat flux and the excess temperature on the boiling surface. The experimental results were compared between R-12 and R-22 with their substitutes. The experimental results were compared with the correlation equations proposed by researchers. Based on the analysis results, modified correlation equations are proposed for the tested refrigerants.
ANALISIS TERMODINAMIKA SIKLUS HIBRID UNTUK PEMBANGKIT LISTRIK TENAGA PANAS BUMI I Made Astina; Kadek Edy Kurniawan; Merly Pastalozi
Mesin Vol. 23 No. 2 (2008)
Publisher : Mesin

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Abstract

Modification of the conventional cycle in a geothermaL power plant is an alternative way that can be conducted in efficient conversion of thermal energy to be electric energy. Combination of Brayton cycle with fossil fuel energy sources and Rankine cycle utilizing geothermal energy is interest of this study. Kamojang Geothermal power plant is chosen as an object of casestudy. A software was developed to accurately evaluate the thermodynamic cycle with any modification. The software is supported by thermodynamic properties database directly derived from equations of state. Hybrid cycle analysis was conducted by comparing the conventional geothermal system operating with independent Rankine cycle such as the current Kamojang geothermal power plant in accordance with rational data ernd assumptions.Simulation results show that 157.88% of power increment, 58.17% of efficiency increment for using organic working fluid R-134a. Replacing R-134a with organic working R-600 afford 162.89% of power increnrent and 63.76% of efficiency increment. Ratio of the net power increment respect to the heating input of fuel is 0.52. This high enhancement is achieved for gas turbine inlet temperature of 1100 celcius degree, pressure ratio of 20, gas temperatltre front steam heater at 350 celcius degree, steam temperature from the heater at 250 celcius degree, and organic turbine inlet pressure and temperature at 35 bars and 340 celcius degree, respectively.
RANCANG BANGUN MICRO AIR VEHICLE KONFIGURASI TAILLESS Taufiq Mulyanto; Arinta H Wijaya; Hari Muhammad
Mesin Vol. 23 No. 2 (2008)
Publisher : Mesin

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Abstract

Nowadays, Micro Air Vehicle (MAV) is mostly developed for surveillance purpose, either for military or civilian. In this article, a design and building of a MAV will be presented. A tailless configuration was chosen. The design and build process started with a study of several design parameters of existing MAVs. Then, it is followed by initial sizing, detail design and production of the MAV. In general, the designed MAV could meet the design requirements and objectives stated. Some preliminary tests had shown that the basic flying characteristics was sufficiently good, although further development still has to be done. The design and build process was also able to evaluate the implementation of some aircraft design formula and method being implemented to design MAV.
CORE SUB-COOLED BOILING OF THE BANDUNG TRIGA 2000 REACTOR K Kamajaya; Henky P.R; E Umar; P. Ilham Yazid
Mesin Vol. 23 No. 2 (2008)
Publisher : Mesin

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Abstract

In 2000, the TRIGA 2000 reactor in Bandung completed a commissioning program and received an operating license at 2000 kW. The Indonesia regulatory body (BAPETEN) issued a 15-year license, to operate the reactor at 2000 kW. During the commissioning tests, bubbling at the reactor core was observed and considered acceptable by General Atomic experts. The sub-cooled boiling observed during the commissiong tests confirmed the predictions of the thermal hydraulics calculations performed by General Atomics and presented in the safety analysis report. In 2004 the operating staff of the Bandung TRIGA 2000 Reactor observed an increase in the amount and size of the bubbles emanating from the core and in January 2005 the BAPETEN after an inspection and discussion with the operating irganization decided to limit the reactor power to 1250 kW. In January 2005, IAEA team mission organize a favt-finding mission to have a better understanding of the safety implications of the reactor bubbling and to propose an action plan to address and solve the issue. Followint this obligation, BATAN submitted to the Agency the current verison of the SAR at the end of 2007. In March 2007, IAEA team mission came to Indonesia di review the SAR was combined with the follow-up on the recommendation from previous mission on investigation of core bubbling phenomena,

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