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All Journal Bulletin of Scientific Contribution : Geology STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin
Gilang Firmansyah, Gilang
Universitas Halu Oleo
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science

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PENGARUH RANGKAIAN SEL PELTIER TERHADAP KINERJA MINI REFRIGERATOR PORTABLE Firmansyah, Gilang; KW, Robertoes Koekoeh; Ilminafik, Nasrul; listyadi S, Digdo; Sholahuddin, Imam
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 1 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Abstract

Thermoelectric Cooler (TEC) / Peltier cooler box requires DC electric current in operation, so that it can be used as a tool to store portable vaccines that are useful in areas that do not have AC electricity flow. The research method uses experimental methods by making the previous research as a reference for conducting experiments with series variations on TEC. This study uses 2 TECs with a series of series and parallel TEC circuits on polyurethane cooler boxes 5,5 L (280 x 180 x 200) mm, power supplied to series and parallel TEC circuits of 20 W, 30 W, and 40 W while taking data is carried out for 60 minutes. The purpose of the study was to determine the effect of TEC cooling on the cooler, COP value, and efficiency on the system. The cooling capability of the TEC in the cooler shows the temperature in the cooler with the variation of the TEC parallel circuit lower than the series TEC. Calculation of the COP value shows the greater power given to the TEC, the COP value will be smaller, the COP value of the parallel circuit at minute 1 - 3 minutes is smaller than the series TEC, but in the 60th minute the difference in COP value between TEC series and The parallel circuit TEC is not too large. Calculation of cooling box efficiency with vaccine loading shows the highest efficiency is a parallel circuit TEC of 25,84% with input power in a 20 W system and a cooling load of 5,17 W, while the lowest efficiency is a series circuit TEC of 13,48% with input power 40 W and cooling load of 5,39W.
PENINGKATAN AKURASI PERHITUNGAN CADANGAN BATUBARA DI WILAYAH SEPARI - KALIMANTAN TIMUR BERDASARKAN DETEKSI KEMIRINGAN LUBANG BOR DENGAN SENSOR GYROSCOPE-ACCELEROMETER-HEADING DIJITAL Firmansyah, Gilang; Sukiyah, Emi; Yuniardi, Yuyun; Mardiana, Undang
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1129.941 KB) | DOI: 10.24198/bsc.v14i1.9786

Abstract

Penaksiran sumber daya dalam suatu proses penambangan batubara didapatkan melalui perhitungan dan analisis data eksplorasi detil. Data ini diperoleh dengan metode pemboran dan pemetaan geologi. Penaksiran sumber daya dilakukan untuk mengetahui taksiran jumlah tonase sumber daya batubara. Hasil taksiran selanjutnya digunakan untuk perhitungan stripping ratio pada lahan tersebut untuk mengetahui keekonomian bahan tambang. Hasil yang diperoleh dapat  menentukan kelayakan suatu tambang untuk di eksploitasi. Pada proses pengeboran terdapat istilah borehole deviation, yaitu deviasi atau simpangan miring dari suatu target lubang bor. Selama ini, pengeboran tegak lurus selalu dinyatakan memiliki kemiringan 90°. Asumsi tersebut sebenarnya tidak tepat. Kemiringan lubang bor yang dinyatakan tegak lurus ternyata memiliki nilai bervariasi. Oleh karena itu, survei kemiringan lubang bor perlu dilakukan untuk mengetahui kemiringian lubang bor secara akurat. Nilai dip dan azimut lubang bor turut berperan sebagai parameter penting dalam meningkatkan akurasi perhitungan cadangan. Berdasarkan hasil uji coba terhadap penggunaan sensor gyroscope-accelerometer-heading dijital pada pengeboran eksplorasi di wilayah Separi diperoleh adanya peningkatan hasil perhitungan cadangan batubara.
Co-Authors Digdo Listyadi, Digdo Emi Sukiyah Ilminafik, Nasrul Imam Sholahuddin KW, Robertoes Koekoeh Undang Mardiana Yuyun Yuniardi