Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Reaktor Mechatronics, Electrical Power, and Vehicular Technology Jurnal Teknologi Journal of Engineering and Technological Sciences Mesin Teknologi Indonesia Teknologika Indonesian Journal of Physics (IJP)
Ari Darmawan Pasek
Faculty Of Mechanical And Aerospace Engineering,Institut Teknologi Bandung
Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

Published : 18 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 18 Documents
Search

 1   2 
METODOLOGI PERHITUNGAN KOEFISIEN PERPINDAHAN PANAS KONVEKSI PAKSA FLUIDA ORGANIK PROPANA PADA KONDISI SUPERKRITIK Harmen Harmen; Willy Adriansyah; Abdurrachim Abdurrachim; Ari Darmawan Pasek
Jurnal Teknologi Vol 9, No 2 (2017): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.9.2.89-96

Abstract

Penelitian tentang siklus Rankine organik superkritis mulai giat dilakukan sebagai salah satu usaha untuk meningkatkan efisiensi termal dari siklus Rankine organik. Pada kondisi superkritik, sifat-sifat termodinamika dan fisika dari fluida organik berubah dengan sangat drastis disekitar titik kritisnya. Sehingga perhitungan koefisien perpindahan panas konveksi paksa tidak dapat lagi dilakukan dengan asumsi sifat-sifat fluida konstan. Dalam penelitian ini diusulkan sebuah metodologi untuk menghitung nilai koefisien perpindahan panas pada kondisi superkritis. Propana digunakan sebagai fluida organiknya. Tipe alat pemindah panas yang dipakai adalah jenis pipa ganda aliran berlawanan arah dan perhitungan bilangan Nusselt menggunakan korelasi Dittus-Boetler dan Gnielinski. Hasil perhitungan koefisien perpindahan panas dengan menggunakan metodologi ini dapat digunakan untuk menghitung luas daerah perpindahan panas dari alat pemindah panas tipe double pipe counter flow. Selanjutnya hasil perhitungan ini perlu dibandingkan dengan nilai koefisien perpindahan panas yang diperoleh dari hasil eksperimen.
ANALISIS DINAMIKA STRUKTUR PADA SISTEM FLEKSIBEL DI ANTARIKSA Ari Darmawan Pasek
Mesin Vol. 9 No. 1&2 (1990)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Berdasarkan data-data penelitian sebelumnya, dalam makalah ini akan dibahas model pendidihan dan mekanisme perpindahan panasnya pada permukaan berpori dalam cairan refrijeran. Ditunjang dengan suatu kajian analitik, diusulkan tiga model pendidihan yang terjadi pada tiga daerah fluks panas yang berbeda. Pada fluks panas rendah terjadi pendidihan pada dasar permukaan berpori dan pada fluks panas tinggi terjadi pendidihan pada permukaan. Sedangkan model pendidihan yang ketiga adalah pendidihan antara yang terjadi pada daerah transisi antara daerah fluks panas rendah dan tinggi. Pada makalah ini akan dibahas pula suatu metoda dan persamaan korelasi untuk memperkirakan koefisien perpindahan panas pada setiap daerah pendidihan.
PERBANDINGAN PERSAMAAN KOEFISIEN PERPINDAHAN KALOR KESELURUHAN UNTUK PERANCANGAN PENUKAR KALOR Yuli Setyo Indartono; Ari Darmawan Pasek
Mesin Vol. 11 No. 2 (1996)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This paper concerns with comparison of various heat transfer equations which can be used in the design of a shell and tube heat exchanger for combustion gas and air. A computer programme which also includes the thermodynamics properties of the gas and air was made for that purpose. Characteristics of the heat exchangers are then compared with the existing industrial heatexchanger. It was found that the overall heat transfer coefficient equation proposed by Babcock & Wilcock gives the best results .
PENGARUH ETANA PADA REFRIGERAN HIDROKARBON Zainal Abidin; Ari Darmawan Pasek; Abdurrachim Abdurrachim
Mesin Vol. 18 No. 2 (2003)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
PENGEMBANGAN PERSAMAAN KORELASI PENDIDHAN KOLAM UNTUK REFRIGERAN HIDROKARBON Ari Darmawan Pasek; Willy Adriansyah; Hery Hery; Hengky Leo
Mesin Vol. 23 No. 2 (2008)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydrocarbons (HC) are considered as the alterative substitutes of CFC and HCFC refrigerants. Using it as new refrigerants needs a complete knowledge of its characteristics. One of them is the boiling heat transfer coefficient. Series of experiments were carried out to investigate this characteristics. Experiments had been carried out with R-12 (CFC) and R-22 (HCFC) and their substitutes, HC-12 and HC-22. Tested refrigerant was conditiond at a saturated state and an electric heater immersed in the refrigerant pool of liquid was used as the boiling surface. Boiling heat transfer coefficient is determined as the ratio between the heat flux and the excess temperature on the boiling surface. The experimental results were compared between R-12 and R-22 with their substitutes. The experimental results were compared with the correlation equations proposed by researchers. Based on the analysis results, modified correlation equations are proposed for the tested refrigerants.
Potensi Pemanfaatan Serat Selulosa sebagai Material Bahan Baku dalam Sintesis Filter Udara Non-Woven sesuai Standar TAPPI T 205 Irwan Suriaman; Mardiyati; Jooned Hendrarsakti; Ari Darmawan Pasek
Jurnal Teknologika Vol 10 No 2 (2020): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1217.503 KB) | DOI: 10.51132/teknologika.v10i2.80

Abstract

Industry 4.0 era materials used by entrepreneurs should be recycled, environmentally friendly, renewable with less chemical content. Indonesia as a tropical country has a large land area with the potential to produce the largest natural fiber in the world. One opportunity that can be applied to the utilization of natural fibers in air filters that currently use dominant materials is synthetic fibers. natural fiber has the advantage because it does not contain toxic chemicals, local raw materials, and is easily produced. This research will analyze the mechanical and morphological characteristics of biological fibers that have great potential as pre-filter raw material. Analysis of mechanical properties through tensile strength testing for single fibers and morphological analysis through scanning electron microscopy (SEM). Tensile testing was the results are; palm oil has a tensile strength of 620 MPa; 998 MPa and 213 MPa flax coconut fiber. For the morphological test results from SEM analysis for ramie fiber, it looks solid without fiber holes; The fibers appear to be many small fibers bound to one another while coir fibers have many pore holes in one observed fiber.
Source Term Calculation of Small Pb-Bi Cooled Non-Refueling Nuclear Power Reactor 20 MWe (SPINNOR 20MWe) Imron Imron; Zaki Su’ud; Ari Darmawan Pasek
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.017 KB) | DOI: 10.5614/itb.ijp.2010.21.2.5

Abstract

Source term calculation of small Pb-Bi cooled, 15 years non-refueling nuclear reactor 20 MWe (SPINNOR 20MWe) has been performed. The study is limited on activity, toxicity, thyroid and whole body dose. The reactor has an average power density of 187 watt/cm3 with near zero postulated accident propability. The LOCA probability less than that of PWR type because of low pressure condition in the Reactor vessel. The coolant freezing in room temperature can protect nuclide from escaping. Antisipated accident by design capable to protect reactor from unprotected transient over power and unprotected loss of flow accident without scram. In hipotetik scenario accident, there is a sabotage in vessel and core melt when cooling system is lost. Core inventory factor on final cycle is 3,69E+9 Ci/MWth. Except elemental iodine and noble gas, all radionuclides were traped in containment. The source term in containmen 1,8 h after accident for Noble Gas group is 2,38E+09 Ci, Halogen group is 5,12E+08 Ci, Alkali metal group is 3,04E+08 Ci, Tellerium group is 3,99E+07 Ci, BaSr group is 6,80E+07 Ci, Noble Metal group is 2,91E+06 Ci, Lanthanide group is 1,72E+06 Ci, Cerium group is 8,12E+07 Ci. Np-237 is the longest for clearance time about 16.500 years, the most toxic is Xe-138 with α/D reach 7,38E+19. The Source term is used for estimate thyroid dose, in EPZ is 0.89 rem and in LPZ is 0.055 rem below limit constrain PWR 180 rem and 130 rem. The whole body dose in EPZ and LPZ is 0,00132 rem dan 0.000269 rem with PWR Standard 9,74 rem dan 8,54 rem. Based on acceptece criteria of PWR type, the safety requirement of SPINNOR 20MWe is achieved.
Source Term Analysis of Small Long-Life without Refueling 420 MWt PWR during Loss of Coolant Accident (LOCA) M. I. A. Abidin; Zaki Su'ud; Ari Darmawan Pasek
Indonesian Journal of Physics Vol 21 No 3 (2010): Vol. 21 No. 3, July 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (321.99 KB) | DOI: 10.5614/itb.ijp.2010.21.3.5

Abstract

Source term analysis of a small long-life 420 MWt PWR has been performed. The analysis includes calculation of fission products inventory in the core, the core activity, source term activity and toxicity, and also dose calculation on various situations during LOCA. Diffussion calculation conducted during the Beginning of Life (BOL) of the reactor. LOCA scheme calculated when the reactor has been operated for 10080 full power days. Fission products activities in the core have a total of 3.2E+08 Ci. Fission product activity that are released to the environment with assumption that 100% of noble gas, 50% of halogens and 1% of other source term groups are released resulting in a total activity of 6.71E+05 Ci, or about 0.21% of total activity in the core. Toxicity analysis show that there are 200 nuclides released to the atmosphere categorized as dangerous. Calculation of thyroid dose in the boundary of exclusion zone (350 m) gives result of 0.57593 rem, while in low population zone resulted in 0.23013 rem. Whole body dose calculation in exclusion zone resulted in 0.14583 rem and in low population zone, the whole body dose is 0.05107 rem.
Co-Authors Abdurrachim Abdurrachim Abdurrachim Abdurrachim Abdurrachim Abdurrachim Adriansyah, Willy Aryadi Suwono Aryadi Suwono Efrizon Umar Enri Damanhuri Harmen Harmen Hendrarsakti, Jooned Hengky Leo Herlian Eriska Hery Hery Hery Hery Imron Imron Indartono, Yuli Setyo Irwan Suriaman Kania Dewi Kilbergen W. Gultom Kilbergen W. Gultom Leo, Hengky M. I. A. Abidin Maemonah, Maemonah Mardiyati, Mardiyati Maulana Arifin Maulana Arifin Nanang Triagung Edi Hermawan, Nanang Triagung Edi Willy Adriansyah Willy Adriansyah Zaidan Eddy Zaidan Eddy Zainal Abidin Zainal Abidin Zaki Suud