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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Equilibrium Journal of Chemical Engineering
Inayati Inayati
Universitas Sebelas Maret
Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Constant current-fuzzy logic algorithm for lithium-ion battery charging Muhammad Nizam; Hari Maghfiroh; Azis Ubaidilah; Inayati Inayati; Feri Adriyanto
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 13, No 2: June 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v13.i2.pp926-937

Abstract

The lithium-ion (Li-ion) battery has a high demand because of its long cycle, reliability, high energy density, low toxic, low self-discharge rate, high power density, and high efficiency. However, lithium-ion batteries have sensitivity to over-charge, temperature, and charge discharge currents. The conventional battery charging system takes a very long time to charge which makes the battery temperature high. Therefore, a charger system that can maximize charging capacity, shorten charging time, and extend battery life is needed. In this study, a battery charging system was developed using the constant current–fuzzy (CC-fuzzy) control method. The aim is to get faster charging time and maintain battery life by limiting the battery charging temperature. The proposed charger system is dual mode which can be operated in both buck and boost mode. The experimental result shows that the proposed method is superior compared to the constant current constant voltage (CCCV) method in charging time. The CC-fuzzy method charging time is faster compared to the CCCV method by 25% and 12.5% in buck and boost modes, respectively. Whereas from the battery temperature, in buck mode, the proposed method has a lower temperature by 0.5 ⁰C and in the boost mode, each method has the same temperature.
Fabrication of Bioplastic from Rice Straw Inayati Inayati; Abdulloh Abdulloh; Zanuar Bagus R
Equilibrium Journal of Chemical Engineering Vol 4, No 1 (2020): Volume 4 No 1 July 2020
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v4i1.43155

Abstract

Abstract. Oil based plastics have been proven as severe pollutants for the environments as they required years to be degraded. Thus, bioplastics are very attractive as the solution of this problem as they easier to be degraded in soil. This work was aimed to fabricate bioplastics from rice straw, with addition of carboxymethyl cellulose (CMC) and glycerol. Prior to the bioplastic fabrication, cellulose was extracted from rice straw through digestion process using ethanol solution (50% w/w) and sodium hydroxide solution (8% w/w) as catalyst. Digestion process was held for 60 minutes at temperature of 120 oC. Bioplastics were produced by blending dried pulp, carboxymethyl cellulose, and glycerol. Five grams of dried cellulose was dissolved in 100 ml of water. The amount of CMC and glycerol added to the pulp solution were varied from 1 ml to 2 ml and 0.5 to 1.5 grams, respectively. Swelling test (both in water and oil) and biodegradability test were conducted to study the performance of the bioplastics. Results showed that bioplactic dissolved easily in water. During oil swelling test, it showed that higher glycerol content increases the oil proof characteristic of the bioplastic. Meanwhile, the CMC content has no impact during the oil swelling test. The best composition of the bioplastic was achieved with the CMC and glycerol contents of 1.382% (w/w) and 1,843% (w/w), respectively, with the lowest oil swelling test result of 55%. Biodegradability of the bioplactics were lower in higher CMC and glycerol contents. The best composition with maximum weight reduction of the bioplastics was achieved by the bioplastic with 0.469% (w/w) of CMC content and 0.939% (w/w) of glycerol.Keywords: Bioplastic, Rice Straw, CMC, Glycerol, Swelling, Biodegradability
Co-Authors Abdulloh Abdulloh Azis Ubaidilah Feri Adriyanto Hari Maghfiroh Muhammad Nizam Zanuar Bagus R