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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 539 Documents
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A PLAUSIBLE ENERGY YIELD FROM PALM OIL MILL EFFLUENT Ing. Ondřej Cundr
Mesin Vol. 19 No. 2 (2004)
Publisher : Mesin

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Abstract

Application of biogas generated from palm oil mill effluent for producing electricity has been proven as an ecological alternative to naphtha and fossil fuels. In the first part of this article, the process of making oil from fresh fruit bunches is briefly described together with amounts of waste gained. After that, different types of treatment of palm oil mill effluent (POME) as one of results of the process are examined, resulting in a suggestion of anaerobic digestion under thermophilic conditions as the best way to treat POME. Finally, attention is also paid to the emission reduction during an anaerobic digestion in close tanks. The aim of the article is to stress the overwhelming energy potential of POME that can bring high increase in electrification ratio and recognizable decrease of air pollution on the island of Sumatra.
PERANCANGAN DAN PEMBUATAN ALAT UJI KOMPRESOR REFRIGERASI Willy Adriansyah
Mesin Vol. 20 No. 1 (2005)
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Abstract

A compressor testing device based on vapor compression cycle has been designed and built successfully. Simple and easy operation is the main differences between the device and conventional compressor testing device. A reciprocating compressor performance was tested for two kind of refrigerants; R22 and HCR22 using this device. From the experimental results it is found that the isentropic efficiency can be represented by a two degrees polynomial function. The experimental results also shows that the isentropic efficiency of the compressor using R22 is higher compared to the same compressor using HCR22.
ANALISIS SISTEM TATA UDARA DI DALAM KABIN KENDARAAN MINIBUS DENGAN MENGGUNAKAN PERANGKAT LUNAK COMPUTATIONAL FLUID DYNAMICS T. A Fauzi Soelaiman; Andini Aritonang
Mesin Vol. 20 No. 1 (2005)
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The aim of this research is to establish an analysis of an air conditioning system in a minibus vehicle cabin through some series of numerical simulations using a Computational Fluid Dynamics software. Two three-dimensional models of the vehicle were used in the simulations. The first model is a minibus without any passenger, and the second model is a minibus with seven passengers. In this research, the passenger model was considered as another cooling load source, therefore an analysis of the cooling effect experienced by passenger was not performed. A calculation of cooling load was also done to determine the maximum cooling load, using the weather data of Jakarta city throughout the year 2002. An experiment was done using an actual vehicle to validate the model. The maximum error of temperature reading between experiment and simulation was calculated and gave an acceptable maximum error of 10%. The simulation in this step was performed using the first model and steady calculation. A series of simulations were also done to analyze the air conditioning system performance under maximum cooling load. These simulations were done by varying the mass flow rates of the air entering the cabin, using the second model and transient calculations. The temperature and velocity contours acquired from these simulations were able to give good understanding of correlations between the factors influencing the air condition in the cabin.
ANALISIS PERCABANGAN RETAK PADA MATERIAL KERAMIK PIEZOELEKTRIK IGN Wiratmaja Puja; Muhamad Hidayat; Qing Hua Qin
Mesin Vol. 20 No. 1 (2005)
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Abstract

Crack branch or kink in piezoelectric body may occur due to mechanical or electric loading. This paper presents the analysis of crack branch for ceramic piezoelectric materials. This type of advanced materials is very advantageous for application in smart structures, measurements device and actuators. Utilizing the extended Stroh Formalism for elastoelectric, the boundary value problems are solved by way of Hilbert Transforms. The explicit expressions for the elastic, electric, stress and electric intesity factor, and strain energi density are presented in integral forms. These integrals are solved using Gauss-Chebysev-Quadrature. Numerical results for piezoelectric ceramics are presented to illustrate both qualitative and quantitative behaviour of the stress- electric intesity factors.
KAJI NUMERIK DAN EKSPERIMENTAL PERPINDAHAN PANAS PADA EVAPORATOR UNTUK MENDINGINKAN UDARA Prihadi Setyo Darmanto; Deddy Dwi Arjanto; Muhammad Ismail
Mesin Vol. 20 No. 1 (2005)
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This paper presents numerical and experimental study of heat transfer on fins-tube heat exchanger that functioned as an evaporator for coolingof humid air. In this case, change of phase occurred both on air and refrigerant. The proposed numerical analysis is based on the application of mass and energy balances implemented at small control volumes that were part of evaporator. The result of numerical evaluation was then compared to the experimental observation. A good agreement between experimental and numerical results was achieved and the proposed numerical method also could be used as a tool in designing fins tube heat exchanger with phase change in both fluids.
PENGGUNAAN TEKNIK APROKSIMASI (METAMODELING) UNTUK MENYEDERHANAKAN MODEL ELEMEN HINGGA DALAM PROSES OPTIMASI Rachman Setiawan
Mesin Vol. 20 No. 1 (2005)
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Abstract

Complex modelling using Finite element method in iterative optimisation process often yield expensive computation. One of the solution is to replace the expensive finite element analysis with a mathematically simpler model, that is using an approximate relations (Metamodel). Here, the approach is used to characterise the mechanical properties of an anisotropic plate from their corresponding natural frequencies. Radial basis functions model has been chosen for the Metamodel to approximate the finite element model generated in ANSYS 6.1 software. Characterisation process is regarded as an optimisation problem with the objective is to minimise the accumulation of differences between the target frequencies and the updated ones. The use of Metamodel shorten the computation time as well as increase the likelihood of reaching the global minimum. In general, the overall result is reasonably good to predict the mechanical properties of anisotropic plates.
STUDI NUMERIK PENGARUH JUMLAH DAN PUNTIRAN SWIRLER VANES PADA ALIRAN MASUK TABUNG I Gede Parwatha; Firman Hartono; Hisar M Pasaribu; Djoko Sardjadi; Aryadi Suwono
Mesin Vol. 20 No. 2 (2005)
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Abstract

Flow field at the inlet of a combustor under the influence of swirler vanes was investigated computationally. The isothermal flow was examined to predict the combustion stability. The simulations indicate different flow-field characteristics can be achieved under the same swirl number. In addition to swirl number, swirl velocity induces the existence of centrifugal force. This force affect velocity profile peak, static pressure profile, radially; and recirculation zone, axially.
ANALYSIS OF USING ALTERNATIVE REFRIGERANTS FOR ENERGY SAVING IN DESIGN FRAMEWORK OF AIR-CONDITIONING SYSTEM I Made Astina; Prihadi Setyo Darmanto; Warsito Warsito; Edwin Adryanto
Mesin Vol. 20 No. 2 (2005)
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Abstract

Environmental issues enforce us to find environmental friendly alternative refrigerants. Increasing energy consumption as consequence of widespread usage of air-conditioning systems needs effort to find efficient systems. Use ability of alternative refrigerants and effect of modified vapor-compression cycles were investigated in this research. In figuring effects of their application on a real air-conditioning system, analysis of redesign of air-conditioning system was concerned to make clear the problem. The results confirm that a right selection of refrigerants to air-conditioning system can improve its performance. Energy saving and economical costs can be reduced significantly. Several groups of hydrocarbons (HC) and hydrofluorocarbons (HFC) have good thermodynamic performance and better than R-22 that will be phased out. By introducing these alternative refrigerants, carbon-dioxide (CO2) emissions can be reduced due to energy saving caused by increasing of the coefficient of performance (COP).
PENGEMBANGAN METODE SIMULASI SISTEM PENGKONDISIAN UDARA ENERGI SURYA Agus Hermanto; Aryadi Suwono; Abdurrachim Abdurrachim; Ari D Pasek
Mesin Vol. 20 No. 2 (2005)
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Abstract

In this research, a simulation method has been developed for designing a solar air conditioner and predicting its perfomances. This simulation based on solar irradiation data, solar collector performance data, LiBr-H2O absorption chiller single effect performance data, Phase Change Material (PCM) data as its inputs. Napthalene is used for HTTS and acetic acid is used for TTS. Energy balance, mass balance, and characteristic equations of each component are used in the solar air conditioning simulation. Validation of the developed simulation model was done with experiment data for solar air conditioning system with HTTS and LTTS without auxiliary heater. Generally, the tendency of the simulation and experiment results are similar. The application of HTTS and LTTS make the system can be operated more in 100 minutes.
MEASURING AND COMPENSATING FOR OFF-LINE TO RUNNING MACHINERY MOVEMENT Phan Anh Tuan; Zainal Abidin; Komang Bagiasna
Mesin Vol. 20 No. 2 (2005)
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Actually, all rotating equipments which connected one to each other undergo a change in position during start-up (off-line) and this condition will affect the alignment of the shafts while running. The off-line to running movement characteristics of the vast majority of rotating machinery in industries have never been measured. It is very important to know how much movement occurred before concluding that it is insignificant and can be ignored. This paper will show the characteristics of both cold and hot misalignment. The purpose of this work is to analyze the influence of temperature to misalignment of rotating equipments that has been mentioned in some references but never been investigated. The objective of this work is to find out the characteristics of hot misalignment and to compensate for Off-Line to Running (OL2R) machinery movement. The results of the experiments and analysis show that the misalignment condition changes during operation and it strongly influences on the vibration level of the rotating machinery. In this case, the smaller the misalignment value, the smaller vibration level of the rotating machinery.

Page 42 of 54 | Total Record : 539

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