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All Journal Jurnal Spektra Jurnal Ilmu Fisika Andalasian International Journal of Applied Science, Engineering, and Technology Jurnal Abdimas: Pengabdian dan Pengembangan Masyarakat JECCOM
Valdi Rizki Yandri
Politeknik Negeri Padang
Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics

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The utilization of biodiesel from waste cooking oil for Unand campus buses in Padang, Indonesia Yandri, Valdi Rizki
Jurnal Spektra Vol 11, No 1 (2011): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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

Abstract

Waste Cooking Oil (WCO) as the waste from household, restaurant and food entrepreneur will be processed to biodiesel. It will be used only for campus buses of University of Andalas (Unand) in Padang, West Sumatera, Indonesia. Noticeably, the campus buses fuel not only consist of biodiesel but also petrodiesel too, i.e. 5% biodiesel and 95% petrodiesel. Unand has four types of campus bus. i.e. 27 white microbus, 7 white bus, 4 green bus and 1 exclusive bus with the total weekly petrodiesel consumption is 9,625 L. It means we need 414 L WCO to produce biodiesel. Furthermore, this utilization can support Indonesian government in energy conservation program, i.e. saving the petrodiesel consumption and increasing biodiesel utilization as renewable energy. Keywords: Petro diesel, biodiesel, waste cooking oil, energy conservation.
PROSPEK PENGEMBANGAN ENERGI SURYA UNTUK KEBUTUHAN LISTRIK DI INDONESIA Yandri, Valdi Rizki
Jurnal Ilmu Fisika Vol 4, No 1 (2012): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (429.951 KB) | DOI: 10.25077/jif.4.1.14-19.2012

Abstract

Energy has important meaning in social and economics achievement to continously development and support to national economics activities. Energy consumption in Indonesia increases rapidly parallel with economics engagement and people growth. To supply energy requirement, renewable energy source should be developed. Renewable energy potency like solar energy hasn’t been used for big scale although Indonesia has big energy potency. Indonesia be included on tropical area which is exposed sun radiance almost year. It means solar energy has good prospects to be developed in Indonesia. Solar energy is one kind of energy which is gotten by converting sun calor energy to another type of energy. Solar energy can be used in form solar cell for electrical power plant. The utilization of solar cell can help people who lives on isolated area which is far from electrical network to use electrical energy.
Pemasangan Pembangkit Listrik Tenaga Surya (PLTS) untuk Mushalla Al Barkah di Kelurahan Limau Manis, Kecamatan Pauh, Kota Padang Yandri, Valdi Rizki; Wiharti, Wiwik; Hendri, Zulka; Hendri, Lenny Novi
Jurnal Abdimas: Pengabdian dan Pengembangan Masyarakat Vol 6 No 2 (2024)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jppm.v6i2.1474

Abstract

The Al Barkah prayer room is located in Limau Manis Village, Pauh District, Padang City and still frequently experiences power outages. This condition often causes disturbances to residents when carrying out their worship, so an alternative source of electricity is needed, namely a Solar Power Plant (SPP). The electrical load in this prayer room consists of 8 lamp units. The optimal time for SPP energy convertion is morning until midday, around 08.00 to 12.00. The effect of temperature on the efficiency of the SPP system can be seen from the decrease in power produced even though the intensity of sunlight is still high. This analysis provides a general overview of the performance of SPP without load in one day, showing the importance of monitoring temperature and sunlight intensity to optimize electrical energy output. At noon, around 12:00 to 13:00, the SPP system reaches peak energy conversion. The voltage and current reached their highest values, with power reaching 146.2 W at 12:00 and decreasing slightly to 119.7 W at 13:00 even though the sun's intensity reached its highest peak, namely 1115 W/m². In the afternoon, from 14:00 to 17:00, it shows a significant drop in voltage, current and power. At 14:00, the power produced is still quite high, namely 142.1 W, with a solar intensity of 1009 W/m². However, after 15:00, the power generated decreases drastically, only reaching 36.3 W at 15:00 and decreasing further to 23.5 W at 17:00, with a solar intensity of only 100 W/m².
Solar Panel Installation Engineering for Energy Conversion Optimization in Solar Power Plants Yandri, Valdi Rizki; Mayura, Yona; Wiharti, Wiwik; Hendri, Zulka; Hendri, Lenny Novi; Mufid, Ulfiah
JECCOM: International Journal of Electronics Engineering and Applied Science Vol. 2 No. 2 (2024)
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jeccom.2.2.42-49.2024

Abstract

The sunlight absorption is the main technical factor of solar power plants performance because it affects to the amount of solar energy conversion. In order to optimize this absorption, the position of solar panel should be adapted to the direction of sunlight so it can improve the economic factor of solar power plants utilization. Furthermore, in this research, we have designed and tested three serial connection solar panels with single solar tracker (SST) to optimize the absorption of sunlight and its conversion to electricity, where the electrical current from panel with SST (1.41 – 2.52 A) is higher than panel without SST (0.89 – 1.59 A). Another parameter, namely electrical power of solar power plants, is proportional to electrical current and also higher than without SST (65.2 – 102.4 W), so the stored electrical energy in battery can be also increased. The utilization of Arduino Mega 2560, driver motor BTS7960, and linear actuator can optimize the solar panel absorption and finally this control circuit addition can increase the solar energy conversion to electricity. Besides that, this control circuit will reset the position of solar panel at 6.30 pm to the starting position. It means the solar energy conversion can be maximized by using SST and this advantage can increase the efficiency and support the transition to renewable energy.
The Impact of Load Variations on The 300 W Pico-hydro Power Plants Parameters (Voltage, Current, Frequency and Generator Speed) Hendri, Zulka; Seftiani, Yudia Meka; Abadi, Akbar; Wiharti, Wiwik; Herisajani, Herisajani; Yandri, Valdi Rizki; Haryadi, Yuda; Mayura, Yona
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 2 (2025): July 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i02.249

Abstract

This research examines how load variations affect the performance of a pico-hydro power system, specifically focusing on voltage, current, frequency, and generator speed. Experiments were carried out through direct measurement under different load conditions. The findings reveal that as the load increases, the output voltage decreases due to higher circuit resistance, while the output current rises significantly. The generator frequency remains relatively stable under light loads but starts to fluctuate near full capacity, indicating the need for improved regulation. Similarly, the generator’s rotational speed declines with higher loads, signaling a performance limit. These results highlight the critical relationship between load changes and system performance, providing valuable insights to enhance the efficiency and stability of pico-hydro systems, especially for renewable energy applications in remote areas.
Co-Authors Akbar Abadi, Akbar Haryadi, Yuda Hendri, Lenny Novi Herisajani Herisajani Mayura, Yona Mufid, Ulfiah Seftiani, Yudia Meka Wiwik Wiharti Zulka Hendri