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Aloysius Eddy Liemena
Universitas Pattimura
Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Industrial & Manufacturing Engineering

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PERHITUNGAN TERMODINAMIKA SIKLUS KERJA MESIN DIESEL YANMAR EMPAT LANGKAH SATU SILINDER 5,5 HP DAN 2200 RPM (KAJIAN TEORITIS) Aloysius Eddy Liemena
ARIKA Vol 7 No 1 (2013)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

Siklus kerja suatu mesin empat langkah terdiri dari langkah-langkah berikut : I. Langkah pengisapan, yaitu pemasukan campuran udara bahan bakar atau udara ke dalam silinder mesin. II. Langkah kompresi, selama mana campuran udara bahan bakar atau udara ditekan/ di kompresi di dalam silinder tersebut. III. Langkah daya atau kerja, selama mana pembakaran campuran udara bahan bakar dan pemuian/ekspansi hasil-hasil pembakaran terjadi di dalam silinder. IV. Langkah pembuangan, selama mana hasil-hasil pembakaran dikeluarkan dari silinder tersebut. Perhitungan-perhitungan dibuat dengan mengambil sebagai suatu dasar titik-titik utama diagram indikator dasar tidak terkoreksi. Diketahui bahwa daya kuda mesin adalah 5,5 hp, kecepatan mesin 2200 rpm, koefisien udara lebih adalah 1,6, tekanan pembakaran maksimm 76 kg/cm 2, perbandingan kompresi 17,9. Asumsi bahwa temperatur udara luar adalah 290 K, Tekanan udara 1 kg/cm 2 , koefisien gas-gas sisa 0,03 komposisi bahan bakar C = 86%, H = 13% & O = 1%, nilai panas bawah bahan bakar 10100 kCal/kg. Metode yang digunakan dalam perhitungan ini adalah metode Grineveksky-Mazing. Hasil perhitungan parameter-parameter adalah tekanan dan temperatur pada permulaan kompresi adalah, p a = 0,92 kg/cm2= 320,83 K, efisiensi pengisian = 0,85514538 tekanan dan temperatur pada akhir kompresi adalah, p= 48,59 kg/cm2 dan T = 946,72 K, rasio kenaikan tekanan = 1,564, Jumlah udara teoritis yang diperlukan yang diperlukan untuk pembakaran bahan bakar cair = 0,4945 mole/kg bahan bakar, jumlah udara aktual = 0,7912 mole/kg bahan bakar, jumlah total hasil-hasil pembakaran = 0,824 mole/kg bahan c bakar, Koefisien kimia perubahan molar = 1,04, koefisien perubahan molar dengan memperhitungkan gas-gas sisa = 1,039, dan tekanan dan temperatur pada akhir pembakaran adalah p dan T = 1996,91 K, rasio ekspansi awal = 1,4, rasio ekspansi lanjutan = 12,7857 dan tekanan dan temperatur pada akhir ekspansi adalah pzb= 2,932 kg/cm2 dan T = 985,03,2 K, tekanan indikasi rerata = 8,26456027 kg/cm2 b, tekanan indikasi rerata terkoreksi = 8,020402346 kg/cm, tekanan efektif rerata = 6,369426752 kg/cm2, tekanan efektif menurut rumus daya = 6,369426752 kg/cm, sertapemakaian bahan bakar spesifik indikasi = 0,14931 kg/hp hr dan pemakaian bahan bakar spesifik efektif F = 0,188012 kg/hp hr.
Analisis Energi Pada Kompresor Tiga Tingkat Yang Mengalami Penurunan Tekanan Aloysius Eddy Liemena
ARIKA Vol 4 No 2 (2010)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

From the engineering thermodynamics point of view, compressor is assumed as a device of a steady-flow process that the mass of air or gas with energy as heat and work could enter or exit from the system. Air came through the compressor assumed as the ideal gas according by the first & second law of thermodynamics and had a three stage polytropic and so could calculated the steady flow worked that reversible internally. By given the mass flow rate of air, the total of power input for running the third stage compressor could be calculated. At the the three-stage compressor, the air pressure could be dropped from maximum to minimum. This research aims to decide the specific work and by obtained the air flow rate we could calculate the power input by the compressor.
Perbandingan Laju Aliran Massa Air Panas Terhadap Air Dingin yang Masuk Ruangan Pencampuran Aloysius Eddy Liemena
ARIKA Vol 5 No 1 (2011)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

In course of hot water mixing and the cool water, we are given on how manay hot water and the cool water pouring into the mixing column of second. This research target is to determine tendency (fast trend) ratio of hot current with temperature 60 0C to accelerate the cool current with 10 0C of mixing column with temperature yelded gyrate from 45 0C till 25 0C. Benefit expected from this research is deepen theory thermodynamics and fluid mechanics and technique application and for the related / relevant technological science area especially with mixing column making (mixing chamber). Methodologies weared in this research is descriptive methodologies that is analyse a steady stream from hot water and the cool water entering an mixing column and which also yield warm water. From hot water mixing at temperature 60 0C with cool water at temperature 10 0C, yielding warm water with temperature which vary from 45 0C till temperature 25 0C yield fast ratio degradation of hot current to cool water with variation of, y from 2,34 till 0,43 (downhill).
Laju Aliran Massa Air Pendingin Yang Diperlukan Dan Laju Perpindahan Panas Dari Refrigeran Ke Air Pendingin Aloysius Eddy Liemena
ARIKA Vol 5 No 2 (2011)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

The inner tube made a couple of turns inside the shell to increase the heat transfer area, thus the rate of heat transfer. The first, the entire heat exchanger was selected as control volume, Q became zero, since the boundary for this case lay just beneath the insulation and little or no heat crossed the boundary, The second, one of the fluids was selected as the control volume, then heat would crossed this boundary as it flew from one fluid to other and Q would not be zero. Refrigerant -12 was to be cooled by water in a condenser. The refrigerant entered the condenser with a mass flew rate of 5,5 kg/min at 0,9 MPa and variety of temperature 600 - 80 0C and leaved at variety 250 - 45 0C. The cooling water entered the condenser at 295 kPa and variety of temperature 50 - 25 0C and leaved at variety 150 - 35 0 C. The mass flew rate of the cooling water requireded was variety 20.9 - 20.31 kg/min ( decreased ). The heat transfer rate from the refrigerant to water was variety of 878 - 848,75 kJ/min ( decreased ).
Penentuan Parameter Titik-Titik Utama Siklus Kerja Mesin Diesel Kecepatan Tinggi Empat Langkah Dengan Perbandingan Kompresi 17 Dan Perbandingan Tekanan 1,8 (Kajian Teoritis) Aloysius Eddy Liemena
ARIKA Vol 6 No 1 (2012)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

An internal-combustion engine is the name given to a reciprocating heat engine in which the fuel is burned directly inside a working cylinder. The mixture of gases produced upon the combustion of the fuel in the cylinder of the engine forms the working substance which presses against the piston and does work. The entire working cycle of a four-stroke engine is completed during four strokes of the piston or two revolutions of the crankshaft, with only one stroke of the piston being a working one. The shaft rotates during the other strokes at the expense of the work performed in other cylinders or of the reserve energy stored by the flywheel during the power stroke of the piston. The pressure and temperature at the principal points that characterize the working cycle of a diesel engine can be determined from formulas of thermodynamics with account taken of the thermochemical processes that take place in the engine. The result of determine the parameter is the pressure and temperature at the beginning of compression, pa= 0,90 kg/cm2and Ta= 310 K, pressure and temperature at the end of kompression, pc= 40,1 kg/cm2 and Tc= 812,3 K, and pressure and temperatuer at the end of combustion, pz=72,18 kg/cm2and Tz= 1984,12 K and pressure and temperature at the end of expansion, pb= 3,454 kg/cm2and Tb= 1135,5 K.
Mesin Diesel Kecepatan Rendah Dua Langkah Dengan Rasio Kompresi 13 dan Rasio Tekanan 1,7 Dengan Penentuan Parameter-Parameter Titik-Titik Utama Siklus Kerjanya (Kajian Teoritis) Aloysius Eddy Liemena
ARIKA Vol 6 No 2 (2012)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

An internal-combustion engine is a reciprocating type of engine in which the working substance is a mixture of gases produced by combustion of fuel in the engine cylinder. A diesel or compression-ignition engine is a machine with self-ignition engine of fuel and internal mixing. The working cycle of a diesel engine can also be completed in two strokes of the piston. The mixture of gases produced upon the combustion of the fuel in the cylinder of the engine forms the working substance which presses against the piston and does work. The pressure and temperature at the principal points that characterize the working cycle of a diesel engine can be determined from formulas of thermodynamics with account taken of the thermochemical processes that take place in the engine.
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