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Mesin
Published by Institut Teknologi Bandung
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Articles 539 Documents
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PEMODELAN PERPINDAHAN PANAS PROSES PENDINGINAN TERAK SEMEN DALAM GRATE COOLER Darmanto, Prihadi Setyo; Sugiharto, Sri
Mesin Vol 19, No 1 (2004)
Publisher : Mesin

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Abstract

Cooling of clinker into grate cooler is one of important processes in cement manufacturing because it influences the quality of the clinker and also determines heat recovery of the combustion air which related well to the fuel consumption. Heat transfer mechanism of the clinker cooling comprises radiation, convection, and conduction. This paper presents a numerical method of clinker cooling process on a grate cooler in order to evaluate temperature distribution of both clinker and cooling air in vertical and horizontal directions along the grates. The result was validated with the measurement of clinker temperature at the discharge section of the cooler. The proposed evaluation method will pave the way for determining the constant values of the control system for cooling air..
ANALISIS DOMAIN WAKTU GETARAN ACAK LINEAR DENGAN GANGGUAN DERAU WARNA Sutjiatmo, B
Mesin Vol 7, No 1&2 (1988)
Publisher : Mesin

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Abstract

Gangguan sistem getaran kendaraan yang berasal dari ketidak-rataan jalan merupakan proses acak derau warna. Di sini akan dibahas analisis sistem dengan menggunakan metode domainwaktu. Dalam Sutjiatmo [1], telah ditunjukkan analisis dasar metode domain waktu, yaitu analisis sistem getaran dengan gangguan derau putih. Tetapi, ketidakrataan jalan merupakanproses acak alami yang berupa derau warna. Karena itu, dalam makalah ini akan dibahas analisis getaran acak dengan gangguan derau warna .Dengan menggunakan suatu filter bentuk, derau putih dapat diubah menjadi. derau warna yang sesuai dengan gangguan. Kemudian, gabungan filter bentuk dan sistem getaran kendaraan akan mendapat gangguan derau putih dan dapat dianalisis menurut bentuk dasar. Dalam analisis ini, sistem getaran kendaraan dianggap linear.
TINJAUAN TENTANG FENOMENA PERAMBATAN RETAK DINAMIK Husnaini, Husnaini; Suharto, Djoko
Mesin Vol 11, No 1 (1996)
Publisher : Mesin

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Abstract

Fenomena retak lelah dan retak dengan beban kuasistatik sudah rnenjadi konsep yang mapan dan telah digunakan dalam perhitungan rekayasa, Sebaliknya, fenomena retak cepat (fastfracture) masih belum banyak diketahui dan merupakan bidang penelilian baru. Tulisan ini merupakan rangkuman dari penelitian-penelitian dibidang ini. Tujuannya adalah membuat suatu pembahasan yang sistemalik sehingga konsep dan parameter-parameter retak cepat ini dengan mudah dapat dimengerti.
SIFAT MAMPU NYALA DAN MASSA OPTIMUM REFRIGERAN CAMPURAN R-290/R-22 SEBAGAI ALTERNATIF PENGGANTI R-22 Pasek, Ari D; Suwono, Aryadi; Nugraha, Novianti; Rosyadi, Usman
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.
STUDI EKSPERIMENTAL PROSES QUENCHING BERKAS PIPA PANAS SEBAGAI PEMODELAN PROSES REFLOODING TERAS REAKTOR NUKLIR Wasitho, Muhadi Ayub; Suwono, Aryadi
Mesin Vol 12, No 1 (1997)
Publisher : Mesin

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Abstract

To simulate the thermohydraulic characteristics of reflooding process of a nuclear core reactor during lost of cooling accident, an experimental study using a reduced model was carried-out. The core reactor model consists of a 50 mm tubular transparent shell made of quartz and a bundle of 4 zircaloy-4 pipes of equal diameter 10.7 mm which are equipped with electrical heaters in the inside. The configuration of pipe bundle is in-line with the distance between pipe axis is 14.2 mm. The pipes are identic to those usually used as nuclear reactor fuel claddings. The quenching process was done by flooding the pipe bundle from the bottom. The observation temperature drop of the pipes surface and temperature rise of cooling water for various wetting velocity, initial pipe temperature and cooling water were recorded and analyzed. The quenching phenomenon was also observed visually. The initial pipe temperature and wetting velocity range are 100 - 500 "C and 4 - 20 cm/s, respectively.
Powering The Archipelago: Accelerating Rural Electrification in Indonesia with Community-based Renewable Energy Wahono, Jaya; Wibowo, Djati; Nurhadiyanto, Mohammad Arif; Kartika, Surya Batara; Rizal, Irfansyah; Azmi, Abdul Luky Shohiful; Satriyo, Dodi Budi; Murbini, Adhi Nugroho
Mesin Vol 26, No 2 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (495.338 KB) | DOI: 10.5614/MESIN.2017.26.2.1

Abstract

Large portion of the population in Indonesia lack access to electrical power, and 85% of these portion live in rural areas. This lack of access to electrical power means also lack of access to people’s fundamental needs. In addition, local industry cannot flourish without universal access of electricity among the population. Therefore, increasing access of electricity regardless where the population live is crucial to distribute wealth throughout the archipelago. The lack of access to electrical power in remote areas is primarily due to sparse population all over the country and limited power infrastructure. Additionally, most are generated by centralized power plants and therefore making it difficult to be distributed evenly to the entire country due to its archipelagic nature. Consequently, diesel fuel is used to generate power in remote areas, raising the cost of generation of electricity significantly while hindering the local community to get equitable and reliable access of electricity. Our solution to this particular problem is to develop distributed power generation system where each small areas will be provided with their own electrical power generator. This distributed power generation system is not only powered by local renewable energy source but it will also enhance the economic activities in the area. Distributed power generation will also contribute to a more equitable, reliable, affordable, and sustainable electricity in remote areas. By promoting distributed renewable energy in Indonesia, we believe that it will bring about the transition to the use of renewable energy source to generate electrical power in the entire country.
Life Cycle Testing of Hermetic Compressors With Alternatives to CFC-12 Devotta, Sukumar; Sawant, Nitin N; Joshi, Shailesh N
Mesin Vol 14, No 1 (1999)
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Abstract

Life cycle tests of hermetic compressors were conducted using a specially designed test rig that employs a gas cycle. They were conducted at an ambient temperature of 50”C and suction and discharge pressures of 2.2 bar and 18.5 bar respectively. The oil temperature was maintained between 80- I 00”C. The duration of test was 2000h.After completion of the test, the oil samples were tested for total acid number and metal contents (Cu, Fe and Al). Any chemical degradation of refrigerant sample was assessed using NMR and F T-IR spectroscopes. The wear effects of compressor parts were measured using perthography.An assessment of conventional mineral oil with CF C-12 and various grades of hydrocarbon (HC-290 and HC-600a) blends including DIN grade, CARE-30, a blend of HC-290/HC-600a from Indian sources, destenched LPG, and commercial grade LPG has been done. HFC-134a and Polyol ester oil (POE) combination has also been studied. The comprehensive test results from the above assessment and comparative ratings are presented
An Experimental Verification of a Methodology for Assessing The Energy Performance on Turning Processes Raharno, Sri; Martawirya, Yatna Yuwana; Cipta Wijaya, Jeffry Aditya
Mesin Vol 25, No 2 (2016)
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Abstract

This paper aimed to experimentally verify the methodology for assessing energy performance of turning processes that had been developed on the prior research. Specific energy consumption is used as the indicator in the process assessment. The experimental verification can be separated into two main steps. The first step is to construct the reference values of specific energy consumption and the second step is to compare the reference values to the specific energy consumption from the assessed process. The reference values were constructed based on the data of specific energy (from experiment) using data envelopment analysis (DEA) method. In this case, MaxDEA Basic 6.6 program has been used to determine the reference values. The experiment was conducted using several lathe machines based on the certain metering strategy. The metering strategy must be determined to maintain the consistency and validity of the process assessment.  After the reference values were constructed, the assessment can be carried out. Energy consumption from the assessed process was measured using power analyzer, and then it was converted into specific energy consumption value according to the material removal rate. Energy reduction score could be calculated based on the distance between the data of specific energy consumption (from the assessed process) and the reference value. The energy performance of the machine is better if the score of energy reduction is lower and nearer to the reference value. The methodology was designed to be as simple as possible in order to be appropriately implemented on the industry, but without reduce the quality of the assessment. shedding. 
METODA ULTRASONIK UNTUK MENENTUKAN ARAH KRISTAL TUNGGAL BERSTRUKTUR KUBIK Trisnobudi, Amoranto; Sugiharto, Benny
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

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Abstract

Single crystal direction can be determined by x-ray diffraction. The determination of this crystal direction can also be carried out by using ultrasonic method. In this method the ultrasonic wave velocity propagating through the crystal is measured. From this velocity measurement then the crystal direction can be determined. This paper deals with the results of a research about the direction determination of cubic single crystal using ultrasonic wave. There are two methods used, namely graphical method and computer method. These two methods used the same data, i.e. velocity data for all possible direction that has been calculated based on the wave and elasticity theory. In the first method, the data are stored as several graphics whereas in the second method they are stored as database in a computer program. These two methods have shown the same results in aluminum for crystal directions [311], [331], [661], [631] and [611] where the computer method can be carried out quicker than the graphical method.
ANALISIS SIKLUS KOMBINASI GAS DAN UAP Sontowiro, Pawito M
Mesin Vol 13, No 3 (1998)
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Abstract

In general, the gas exits from gas turbine still has a high temperature. To recover its energy, a Rankine cycle is installed to receive thermal input energy from the gas. For each value of pressure ratio of the Brayton cycle, the optimum total efficiency is largely controlled by the pressure and temperature of steam entering turbine and the steam—air mass flow rate ratio of the system. With the environment, the fluid entering temperature to the turbines, the minimum fluids temperatures difference in heat exchangers, and the quality of steam at the exit of steam turbine as constraints, optimum total efficiency of the system is investigated on this report.

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