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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 18, No 2 (2003)" : 5 Documents clear
PEMODELAN DAN PERANCANGAN GAS COOLER UNTUK MESIN REFRIGERASI CO2 Adriansyah, Willy
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Gas cooler is one of the important components in CO2 refrigeration system and it must be designed properly. Conventional mathematical modeling used in designing heat exchanger have some drawbacks when the working fluid has large variation on its thermo physical properties. This paper discusses detail modeling and designing one of heat exchanger types which takes into account unique characteristic of CO2 as refrigerant. The mathematical model is then validated by experimental data. The comparison shows that the model predicts gas cooler performance within 2% maximum deviation. The principles of modeling can be applied to various types of heat exchanger.
ANALISIS TEGANGAN THERMAL PADA TROMOL REM TRUK DENGAN KAPASITAS ANGKUT 6 TON Puja, IGN Wiratmaja; Tampubolon, Henry Ako; Suhartanto, Untung
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

This paper presents drum brakes thermal stress analysis for 6 ton truck capacity, due to friction between shoe and drum for two leading shoe brakes type. The mechanical and thermal loading are analyzed for various road conditions such as straight path, curved, and downhill path, with various value of deceleration. Based on the transient heat transfer, the drum temperature distribution are calculated for various deceleration and braking time period. Using finite element techniques, the thermal stressses are obtained and the results are compared to the actual failures evidences of brake drums. It is obeserved that the real heat crack locations are in agreement with the computed stressed areas. Based on the pressure and temperature distribution, the wear rate can be obtained to estimate the technical life of the brake drum.
POMPA SENTRIFUGAL SEBAGAI TURBIN DENGAN PERFORMANSI HASIL PENGUJIAN LABORATORIUM UNTUK PEMBANGKIT MIKRO HIDRO Sutikno, Priyono
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Pump as Turbine (PaT) tested from mixed flow pump type with 250 mm bore diameter, and impeller tip has a minimum modification by rounded the blade, which could improve the efficiency of 2% to 6%. The modification is done by rounded the impeller tip with 2 mm radius. Tested Pump as Turbine at 1000 rpm has an efficiency about 82% and 10 kW power output. The best power produced by 250 mm bore Pump as Turbine is 25 kW at the 75% efficiency. The 15 meters head may have the runaway speed of the Pump as Turbine on asymptotic level at 2500 rpm. The pump as turbine could utilized as Micro Hydro Power driver in the low cost, compare with Francis turbine design and development cost, which is mass production of the pumps and abundant at the market.
PENERAPAN MODEL UP WIND, EKSPONENSIAL, DAN CENTRAL DIFFERENCE PADA METODA ANALISA SUB BULUH Tandian, Nathanael P; Suwono, Aryadi; Winarto, Winarto
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Sub-channel analysis is a method for analyzing thermal hydraulic aspects of nuclear reactors or heat exchangers. The analysis calculates distributions of fluid temperature, pressure, axial velocity, transverse velocity, and fuel rod temperature or heat flux. This paper deals with efforts for improving the accuracy of the sub-channel method. Three numerical schemes for evaluating transversal advective heat rates, i.e.: up wind, exponential, and central difference schemes, were compared. The differences among calculation results obtained by programs that apply these schemes were insignificant. The paper also seeks the best definition of averaged temperature for evaluating physical properties of control volume. It was found that accuracy of the sub-channel method can be improved if the volume-averaged and area-averaged enthalpy in the energy equation, and the volume-averaged density in the axial momentum equation were evaluated based on the fluid temperatures at the middle of control volumes.
PENGARUH ETANA PADA REFRIGERAN HIDROKARBON Abidin, Zainal; Pasek, Ari Darmawan; Abdurrachim, Abdurrachim
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Hydrocarbon refrigerant is one kind of refrigerants, which is developed to substitute CFC and HCFC. The substances contained in hydrocarbon refrigerant are etane, propane, normal butane, and iso butane. Ethane is being suspected on reducing the performance of refrigerator. This paper deals with theoretical study of ethane influence in hydrocarbon refrigerant. First of all it is necessary to create software for evaluating thermodynamics properties. This software has many choices for prescribed thermodynamics properties. According to the analysis, it is known that the more ethane content in HCR-12, the more deviation of saturated pressure-temperature curves between HCR-12 and R-12. While in HCR-22 when the pressure is less that 4 bar, it is known that the more ethane content, the more deviation of saturated pressure-temperature curve between HCR-22 and R-22. However, if the pressure is above 4 bars, it is known that the more ethane, the saturated pressure-temperature curve is close to the one of HCR-22 with 4% ethane content. On performance test of standard refrigeration system using the refrigerant, it is known that the more ethane content in HCR-12 and HCR-22, COP of the system decreases gradually. The average temperature in evaporator and condensor also declines.

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