Articles
<![CDATA[SIMULASI BEBAN PENDINGINAN BATUAN DALAM REKAYASA TEROWONGAN ]]>
<![CDATA[I Made Astina]]>;
<![CDATA[Prihadi Setyo Darmanto]]>
<![CDATA[ Mesin Vol. 10 No. 1&2 (1994) ]]>
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<![CDATA[Rekayasa terowongan sering dihadapkan pada berbagai kendala. Salah satu kendala yang dikaji tulisan ini adalah adanya batuan panas pada suatu bagian tertentu dari terowongan yang akan digali. Kondisi ini tidak munguntungkan dari sisi teknik pengerjaannya mengingat kesulitan para pekerja. Salah satu solusi agar pekerjaan penggalian terowongan dapat dilakukan adalah dengan mendinginkan bagian batuan yang panas tersebut.Di dalam makalah ini akan dibahas teknik pendinginan yang akan digunakan dan estimasi beban di dalam terowongan agar proses penggalian dapat berjalan dengan lancar dan ekonomis. perhitungan beban pendinginan dengan cara numerik juga akan dibahas dalam makalah ini. Fenomenadan dan karakteristik ï¬sik seperti sifat konduktiï¬tas tanah dan batuan, kehomogenan sifat batuan panas dan sumber panas dari batuan panas perlu di pelajari lebih lanjut sehingga penyederhanaan berbagai parameter dalam perhitungan dan estimasi beban diharapkan tidak menyimpang jauh dari beban pendinginan sebenarnya yang terjadi di lapangan.]]>
<![CDATA[PENGEMBANGAN PERANGKAT LUNAK ALAT BANTU PERANCANGAN SIKLON SEPARATOR HEMAT ENERGI ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Katon Primanto]]>
<![CDATA[ Mesin Vol. 12 No. 2 (1997) ]]>
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<![CDATA[This paper presents an optimization technique applying the design of the cyclone separators. The results of this optimization technique were the main geometric ratio of the modiï¬ed cyclone (DOPOL), which presented in non-dimensional form, that satisï¬ed the following criteria: minimum pressure drop or maximum separation efficiency. The design procedure of the cyclone was written as the computer software, where the iterative computation design can be proceed faster. This software used the correlations of the cyclone performance obtained by the previous experimental on a modiï¬ed cyclone. The software not only could be applied for modiï¬ed cyclone design, but it also could be used for the design of the classical cyclone base on the well-known algorithm.]]>
<![CDATA[PENGUJIAN KARAKTERISTIK KINERJA SIKLON SEPARATOR HEMAT ENERGI ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Katon Primanto]]>
<![CDATA[ Mesin Vol. 12 No. 3 (1997) ]]>
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<![CDATA[The performance of cyclone separator is measured by its capability to separate solid particles from dust laden gas flow and its pressure drop. The last parameter shows the energy used for running it. The cyclone having highest separation efficiency and lowest pressure drop is needed in the industrial application. It is the aim of this research work to study a modiï¬ed cyclone in order to ï¬nd a better performance than the classical cyclone type. The modiï¬cation is employed by inclining the roof of cyclone. With this modiï¬cation, the pressure drop could be reduced of about 50% without signiï¬cantly reducing of separation efficiency. This paper presents an investigation of performance of the modiï¬ed cyclone. This experiment proposes some empirical correlation of separation efliciency and pressure drop at various values of dust load.]]>
<![CDATA[KAJI NUMERIK DAN EKSPERIMENTAL PERPINDAHAN PANAS PADA KONDENSER BERPENDINGIN UDARA ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Dedy Dwi Arjanto]]>;
<![CDATA[Muhammad Ismail]]>
<![CDATA[ Mesin Vol. 17 No. 1 (2002) ]]>
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<![CDATA[This paper presents numerical and experimental study of the heat transfer on fins-tube heat exchanger that was employed as an air cooled condenser of the air conditioning system. In this case change of phase occurs on refrigerant side while air remain at gas phase. The proposed numerical analysis is based on the application of mass and energy balances implemented at a small control volume that is part of the condenser. The result of numerical evaluation was then compared with the experimental observation. A good agreement between experimental and numerical results was achieved and the numerical method is proposed that to be used as a tool for fins tube condenser design.]]>
<![CDATA[MODEL MATEMATIS DAN SIMULASI PERPINDAHAN PANAS PROSES PENGECORAN KONTINYU BAJA SLAB ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Arief Syahlan]]>;
<![CDATA[Koesnohadi Koesnohadi]]>
<![CDATA[ Mesin Vol. 17 No. 2 (2002) ]]>
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<![CDATA[This paper presents mathematical model and numerical simulation using CFD software FLUENT 5.4 applied on continuous casting process of steel slab. The distribution of temperature of the steel slab since it exits the mould till straightening region was evaluated. The result of numerical evaluation was also compared to the measurement temperature taken at some selected points. The comparison showed that there was a good agreement between the numerical result and the measurement data. The percentage of both liquid and solid phases along the slab was also simulated. It seems that the simulation of solid phase growth could be used as a method for determining the cross section position where the solidification ceases.]]>
<![CDATA[PEMODELAN PERPINDAHAN PANAS PROSES PENDINGINAN TERAK SEMEN DALAM GRATE COOLER ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Sri Sugiharto]]>
<![CDATA[ Mesin Vol. 19 No. 1 (2004) ]]>
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<![CDATA[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..]]>
<![CDATA[KAJI EKSPERIMENTAL DAN NUMERIK KINERJA CYCLO DUST FILTER ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Joko Sarsetyanto]]>
<![CDATA[ Mesin Vol. 19 No. 2 (2004) ]]>
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<![CDATA[One of the methods for increasing separation efficiency of a cyclone is to implement a fabric filter at its inner tube. The combination of cyclone separator and fabric filter in commonly called as cyclo-dust filter. This paper presents an experimental study of the performance test of cyclo-dust filter and CFD numerical simulation of the flow inside this apparatus. The experiment was conducted for some variation of filter area. The results show that the separation efficiency of more than 99% was observed. This value is normally very difficult to reach with a normal cyclone separator. The pressure drop rises with the increasing of fabric's area. However this increase of pressure drop is not proportional to the increase of the fabric's area. The CFD simulation was also used for determining the best position of inlet duct.]]>
<![CDATA[KAJI NUMERIK DAN EKSPERIMENTAL PERPINDAHAN PANAS PADA EVAPORATOR UNTUK MENDINGINKAN UDARA ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Deddy Dwi Arjanto]]>;
<![CDATA[Muhammad Ismail]]>
<![CDATA[ Mesin Vol. 20 No. 1 (2005) ]]>
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<![CDATA[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.]]>
<![CDATA[ANALYSIS OF USING ALTERNATIVE REFRIGERANTS FOR ENERGY SAVING IN DESIGN FRAMEWORK OF AIR-CONDITIONING SYSTEM ]]>
<![CDATA[I Made Astina]]>;
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Warsito Warsito]]>;
<![CDATA[Edwin Adryanto]]>
<![CDATA[ Mesin Vol. 20 No. 2 (2005) ]]>
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<![CDATA[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).]]>
<![CDATA[MODIFIKASI TOP CYCLONE UNTUK MENINGKATKAN KINERJA SUATU PABRIK SEMEN ]]>
<![CDATA[Prihadi Setyo Darmanto]]>;
<![CDATA[Arief Syahlan]]>
<![CDATA[ Mesin Vol. 21 No. 1 (2006) ]]>
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<![CDATA[Clinker production of a cement plant can be increased by rising clinker to kiln feed ratio-CKFR. One of the methods for increasing CKFR is by improving the separating efficiency of the top cyclone. The increase of separating efficiency of the top cyclone causes not only the increase of production, but is also followed by the lowering of specific heat consumption and percentage of ash in the coal because the exit gas from thetop cyclone is normally used for coal drying. This paper presents a simple and cheap modification of the top cyclone that has been applied in a Indonesian cement plant. The results show that the proposed modification can simultaneously increase clinker production, lower both of specific heat consumption and percentage of ash in the fine coal that used as the main fuel of the plant.]]>
