Darmawi Bayin
Mechanical Engineering Department Sriwijaya University

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THE RECORDS OF THE POWER PRODUCE OF SOLAR CELL OF 50 WP AS LONG AS MARCH 2016 AT KENTEN AREA Bayin, Darmawi
Journal of Mechanical Science and Engineering Vol 4, No 1 (2017): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

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Abstract

Solar cell of 50 WattPeak capacity is used on this research. The measurements are conducted for eight hours a day from 9.00 oâ??clock a.m. till 5.00 oâ??clock p.m.  This research is mainly aimed at to find out the electric power outcome of the solar cell at varies weather conditions in March of 2016 year. All of the equipments and measurements apparatus is stationed at Kenten BMKG Station of Palembang. The solar cell position is facing to the north at an angle of 10º. The total output of electric power is 4384,99 Watt and the total solar light intensity 134062,91 W/m² along March 2016. On full shinny and clear day the maximum power obtained is 49,2 W/hr and the sun light intensity is 1464,6 W/m². On cloudy day, the maximum power obtained is   42,8 W/hr and the sun light intensity is 1216,9 W/m². On rainny day the maximum power obtained is 34,1 W/hr and the sun light intensity is 1042,5 W/m². The results shown the relations between the power obtained and the light intensity, atmosfir temperatur and clouds in the sky
STUDI EKSPERIMENTAL PENGARUH GRAVITASI TERHADAP LAJU KOROSI PADA DINDING SEBELAH DALAM TUBE BAJA KARBON BERPENAMPANG PERSEGI EMPAT YANG DIALIRI LARUTAN ASAM SULFAT 4% DAN 5% SECARA KONTINYU Bayin, Darmawi; Hartono, Hartono
Jurnal Rekayasa Mesin Vol 13, No 2 (2013): Journal of Mechanical Engineering
Publisher : Sriwijaya University

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Abstract

Ringkasan Korosi adalah penurunan mutu logam akibat berinteraksi secara elektrokimia dengan lingkungannya. Lingkungan ini dapat berupa air, tanah dan udara. Karena berlangsung secara elektrokimia, maka proses korosi akan melibatkan reaksi kimia dan listrik yang berupa aliran elektron. Pengaruh korosi tersebut menyebabkan terjadinya penurunan daya guna logam. Penelitian ini bertujuan untuk mengetahui dan menganalisa pengaruh gravitasi terhadap laju korosi pada dinding sebelah dalam spesimen tube baja karbon rendah. Dalam pelaksanaannya, spesimen tube dialiri dengan larutan asam sulfat 5% dan 4% (% by volume). Bagian tube yang diekspose adalah dinding sebelah dalam bagian atas dan bawah untuk spesimen tube yang dipasang horizontal serta dinding sebelah dalam bagian samping untuk spesimen tube yang dipasang vertikal. Dari hasil penganalisaan pengolahan data, dapat disimpulkan bahwa dinding sebelah dalam bagian bawah yang terekspose mengalami laju korosi yang lebih tinggi bila dibandingkan dengan daerah terekspose lainnya. Hal ini disebabkan karena dinding sebelah dalam bagian bawah menerima pengaruh gravitasi yang menyebabkan adanya gaya berat fluida. Parameter inilah yang menyebabkan terjadinya perbedaan laju korosi diantara bagian-bagian yang terkspose tersebut.
PERBEDAAN STRUKTUR MIKRO, KEKERASAN, DAN KETANGGUHAN BAJA HQ 705 BILA DIQUENCH DAN DITEMPER PADA MEDIA ES, AIR DAN OLI Bayin, Darmawi; Putra, M Amin Indra
Jurnal Rekayasa Mesin Vol 9, No 1 (2009): Journal of Mechanical Engineering
Publisher : Sriwijaya University

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Abstract

This research is aim to analyze the effect of  quench at difference medium on the hardness and the impact of HQ 705 steel which is as similar as AISI 4340 with 0.38 â?? 0.43% C; 1.82% Ni; 0.5% - 0.8% Cr  and 0,25% Mo. HQ 705 steel is heated to austenite temperature of  8500C and hold as long as 15 minutes and cooled at the difference mediums, which is water, ice and oil. After that, the steels being tempered at temperature of 5500C and hold as long as 30 minutes, and then again cooled. Finally, the specimens are tested to find hardness, toughness and microstructure. Through this research, we find the increase of hardness, from 33.4 HRC at no treatment to 56 HRC at cooling in water, 40.3 HRC at cooling in oil.