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All Journal SIGMA EPSILON - Majalah Ilmiah Teknologi Keselamatan Nuklir Journal of Energy, Mechanical, Material and Manufacturing Engineering
Wardoyo Wardoyo
Pendidikan Teknik Mesin, Universitas Negeri Jakarta
Computer Science & IT Energy Mechanical Engineering

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EXPERIMENTAL INVESTIGATION ON COMBUSTION CHARACTERISTICS OF REFINE CORN OIL WITH ARECA CATECHU EXTRACT AS ADDITIVE Wardoyo, Wardoyo; Widodo, Agung S.; Wijayanti, Widya; Wardana, I. N. G.
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol 5, No 1 (2020)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (723.925 KB) | DOI: 10.22219/jemmme.v5i1.11990

Abstract

The need for vegetable oils as alternative energy reserves increases with the depletion of fossil energy sources. Vegetable oil is the strongest candidate to replace the fossil energy. However, the use of vegetable oil directly as fuel is limited by high viscosity. Viscosity like this results in non-ideal atomization, challenging to evaporate, and cannot burn completely. Among the methods that have been studied by previous researchers and which have proven to be effective, cheaper, and can reduce the viscosity of vegetable oils better is the mixing method. In this study, corn oil was mixed with areca extract as an additive. Areca extract contains polyphenols which are polar types of epicatechin. Epicatechin has three aromatic rings and several hydroxyl groups. Delocalisation of electrons in aromatic rings can produce London forces on vegetable oil molecules, thereby increasing the reactivity of burning vegetable oil droplets. The burning characteristics of corn vegetable oil affected by areca extract have been studied experimentally at room temperature and atmospheric pressure. The results showed that the rate and temperature of combustion increased, as well as the presence of micro explosions. The London force that appears causes the bonds in the triglyceride molecules to weaken so that the combustion becomes reactive, the rate of heat transfer in the droplets gets better, facilitates the appearance of micro explosions and increases the combustion temperature. Vegetable oil from corn has been studied experimentally at atmospheric pressure and room temperature. The results show an increase in the rate of combustion, an increase in combustion temperature, and the presence of micro explosions. London force that appears causes the bonds in the triglyceride molecules to weaken so that combustion becomes more reactive, the rate of heat transfer in the droplet gets better, facilitates the appearance of micro explosions and raises the combustion temperature.
STUDI EKSPERIMEN PENGARUH BEBAN KALOR TERHADAP UNJUK KERJA TERMAL MODEL LOOP HEAT PIPE Aziz Yudha Nugraha; Mukhsinun Hadi Kusuma; Giarno Giarno; Wardoyo Wardoyo
SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir Vol 25, No 2 (2021): November 2021
Publisher : Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/sigma.2021.25.2.6368

Abstract

Sistem pendingin pasif sangat diperlukan sebagai redundance apabila sistem pendingin aktif pada instalasi nuklir mengalami kegagalan operasi. Konspe teknologi sistem pendinginan pasif yang potensial digunakan dalam menyerap dan membuang kalor dengan baik adalah loop heat pipe (LHP). Diharapkan LHP menjadi solusi manajemen termal dalam keselamatan pengoperasian instalasi nuklir. Tujuan studi eksperimen ini adalah untuk mengetahui fenomena perpindahan kalor yang terjadi di dalam model LHP yang dibuat sendiri dan bagaimana unjuk kerja termalnya dalam menyerap dan melepas kalor. Metode yang digunakan adalah dengan melakukan eksperimen model LHP pada variasi beban kalor pada suhu air panas 35°C, 45°C, 55°C, dan 65°C. Fluida kerja di dalam evaporator menggunakan air demineral dengan filling ratio 200 %. Pembuangan kalor pada bagian condenser menggunakan udara dengan laju pendinginan sebesar 2 m/s. Model LHP divakum dengan tekanan sebesar -74 cm Hg. Hasil studi eksperimen menunjukkan bahwa didapatkan fenomena overshoot, zigzag, dan stable seperti fenomena umum perpindahan kalor yang terjadi pada LHP. Unjuk kerja termal terbaik didapatkan dengan hambatan termal terkecil sebesar 0,0017 ºC/W, yaitu diperoleh pada saat model LHP dioperasikan pada beban kalor 65°C. Kesimpulan dari penelitian ini menunjukkan bahwa semakin tinggi beban kalor yang diterima oleh evaporator menyebabkan semakin kecilnya nilai hambatan termal model LHP.
Co-Authors Aziz Yudha Nugraha Giarno Giarno Mukhsinun Hadi Kusuma Wardana, I. N. G. Widodo, Agung S. Widya Wijayanti