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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 6 Documents
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Search results for , issue "Vol. 22 No. 2 (2007)" : 6 Documents clear
THERMODYNAMIC PROPERTY MODEL OF WIDE-FLUID PHASE n-BUTANE Chan Sarin; I Made Astina; Prihadi Setyo Darmanto; Haruki Sato
Mesin Vol. 22 No. 2 (2007)
Publisher : Mesin

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Abstract

New thermodynamic property model for n-Butane expressed in form of the Helmholtz free energy equation is presented. The formulation consists of eight terms of the so-called ideal-gas part and eighteen terms of the residual part. This is a relatively short equation in comparison to the existing equations, which are widely accepted, including the newly published in year 2006. In its development, available accurate experimental data of fluid properties and theoretical approach from the intermolecular potential were simultaneously considered to insure accuracy and to improve reliability of the equation of state over wide range of pressures and temperatures, especially at low temperatures in which the refrigeration field is concerned. From the coverage of experimental data used in model's development, the validity range is then from triple-point (134.895 K) to temperature of 589 K and pressure up to 69 MPa. The uncertainties with respect to different properties are estimated to be 0.02% in ideal-gas isobaric specific heat, 0.2% in density, 1% in heat capacities, 0.2% in vapor-pressure except at very low temperatures, 0.05% in saturated-liquid density, 0.02% and 0.8% in speed of sound in the vapour and liquid phases, respectively.
SIFAT MAMPU NYALA DAN MASSA OPTIMUM REFRIGERAN CAMPURAN R-290/R-22 SEBAGAI ALTERNATIF PENGGANTI R-22 Ari D Pasek; Aryadi Suwono; Novianti Nugraha; Usman Rosyadi
Mesin Vol. 22 No. 2 (2007)
Publisher : Mesin

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Abstract

The limited application of ozone depleting substance (ODS) such as CFC and HCFC refrigerants has encourage researchers to find a new alternative refrigerant. Hydrocarbon refrigerant such as R-290 (propane) has been widely used because it is environmentally friendly, save energy, and drop-in substitute. However, hydrocarbon refrigerants are flammable and categorized as A3 class refrigerant, so that the application of the refrigerants are limited by safety standard. In this research, an effort to lower the flammability of R-290 has been carried out. Series of flammability test have been done to proof that the flammability of R-290 is reduced by mixing it with R-22. Mixture of R-290/R-22 at molar fraction 0.4/0.6, 0.5/0.5, 0.59/0.41 has Lower Flammability Limit (LFL) above 3.5%, so that it can be classified as A2 class refrigerant. The optimum refrigerant charges of the refrigerant mixtures that give the highest COP have also been investigated. The results show that the optimum refrigerant charge of the mixture is lower than R-22 but higher than pure R-290. The system COP of R-290/R-22 mixture is higher than that of R-22 but lower than R- 290 system.
OPTIMISASI PROSES PEMESINAN EDM WIRE CUT UNTUK MODUS GERAK SIRKULAR MENGGUNAKAN ALGORITMA GENETIK Sigit Yoewono Martowibowo; Adriansyah Adriansyah
Mesin Vol. 22 No. 2 (2007)
Publisher : Mesin

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Abstract

Electro Discharge Machining Wire Cut (EDM Wire Cut) is one of non-conventional machining process which is used by many manufacturer industries. Technology development demands this process can produce high quality product with good productivity. To fulfill this demand, optimization of machining processes that involves several variables can be done. When doing the optimization of machining condition, an algorithm using mathematical model is needed to calculate the optimum values of process variables. There are many optimization techniques and methods which can be chosen, one of them is Genetic Algorithm. In this research work, an implementation of Genetic Algorithm in machining process optimization is presented. As the optimization parameters, feed rate and surface roughness selected. Based on the above parameters and considering the capability of the existing EDM Wire Cut, five input parameters are determined with right combination, namely no load voltage, capacitor, on time, off time and servo voltage. The output has been compared to other optimization method and it appears that the Genetic Algorithm shows promising results and thus may be proposed as an alternative tool in machining process optimization.
EFFECTS OF HYDROGEN ADDITION INTO INTAKE AIR ON THE HYDROCARBON EMISSION OF GASOLINE ENGINES AT COLD START CONDITION Arief Hariyanto; Wiranto Arismunandar; Gerard George Engel
Mesin Vol. 22 No. 2 (2007)
Publisher : Mesin

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Abstract

Start process, particularly cold start condition is considered important to be focused in terms of emission reduction due to high unburned hydrocarbon (HC) concentration in the exhaust gas. Several methods have been proposed and implemented for reducing exhaust gas emission during starting condition. In this paper will be discussed the addition of hydrogen into intake air in order to reduce the level of HC emission during cold start condition. Using this method, the combustion process during starting will be improved to produce better combustion. This paper describes an experiment conducted to find the optimal amount of hydrogen added on start process at various coolant temperatures, which is effective to reduce the total HC concentration at each start temperature, respectively. The results show that the HC concentration in the exhaust gas is influenced by the temperature of engine and can be reduced significantly by hydrogen addition into intake air.
Particle Size Distribution and Rheolog ical Characteristic of Trimethylolethane Treated by Cationic Surfactant Yuli Setyo Indartono; Hiromoto Usui; Hiroshi Suzuki; Satoshi Tanaka; Kousuke Nakayama; Yoshiyuki Komoda; Tetsu Itotagawa
Mesin Vol. 22 No. 2 (2007)
Publisher : Mesin

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Abstract

Trimethylolethane (TME) trihydrate particle suspended in water is a proper substance for latent heat transportation in cooling systems, since it has high heat transfer and thermal capacity. Additives, oleyl bishydroxyethyl methyl ammonium chloride as surfactant and sodium salicylate as counter-ion, were added into TME slurry to reduce its friction factor. Aditives influence on particle size distribution and rheological characteristic of TME are investigated in this study. It is found that the additives do not influence particle size at crystallization point, but they clearly inhibit further particle growth. By increasing molar ratio of counter-ion to surfactant, the particles do not grow at all. Increasing TME concentration reduces the apparent viscosity of TME with surfactant and increases critical shear rate for Shear Induced Structure (SIS) occurrence. By connecting this SIS phenomenon with previous data, it is found that there is a relation between the SIS and drag reduction for this drag-reducing TME suspension system.
PEMANFAATAN SISTEM CAD/CAM/CAE DALAM REVERSE DAN FORWARD ENGGINEERING UNTUK TURBIN FRANCIS Indra Djodikusumo; Lukman Santoso; Rahmat Haris
Mesin Vol. 22 No. 2 (2007)
Publisher : Mesin

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Abstract

The oil price has been increasing since the last few years. Since then the utilization of hydro power plant has also been increasing. The hydro power plant is very well known as environtmental friendly power plant and therefore its utilization is demanded all around the world. Indonesia has planned to build up until 488 MW micro and mini hydro power plant until the year 2020. Half of this is micro-hydro power plant and the other half is mini-hydro power plant. The turbines for micro-hydro power plant have been produced locally, but the other half which are mini-hydro power plant are still imported from foreign countries. It is the intention of this applied research to develop the capability of local industry to design and manufacture the Francis turbine for mini-hydro power plant from 300 kW until 5 MW. The utilization of CAD/CAM/CAE System is very intensif during the development phases. Reverse and forward engineering has been applied for this purpose. The good result has been achieved. The continuous improvement shall be done in the future in order to have the better result.

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