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Asral
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Pengaruh sisi aliran masuk terhadap prestasi pompa sebagai turbin dengan jumlah sudu bervariasi Asral
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/jwzr6s38

Abstract

Pump as Turbine (PAT) is an innovative solution in generating small-scale electrical energy in rural areas. However, the performance of PAT is strongly influenced by the configuration of the impeller, especially the number of blades that can affect the efficiency and electrical output power. Therefore, this study aims to analyze the effect of inflow and variation in the number of impeller blades on the performance of PAT as a picohydro power plant. This research was conducted experimentally in the laboratory using three different types of impellers, each having 9, 10, and 12 blades. Tests were conducted at various levels of valve opening ranging from 50%, 66.6%, 83.3% and 100% opening. The test results were then analyzed based on system efficiency, water flow rate, and electricity generated. The results showed that the impeller with the number of blades 10 produced the highest efficiency which reached 78% at 100% valve opening, while the impeller with the number of blades 12 showed the lowest efficiency due to greater water flow resistance. The highest electrical power is generated by the number of blades 10 with an output of 258.74 Watts. Thus, the selection of the optimal number of blades is very important to improve the performance of PAT as an efficient and economical renewable energy solution
Analysis of co-firing palm oil waste for the economic and emission performance of PLTU in Riau Aulia Ramadhan; Anita Susilawati; Asral; Dodi Sofyan Arief; Dinni Agustina
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/rkcrwn20

Abstract

This study evaluates the co-firing of palm oil industry waste biomass, specifically Palm Kernel Shell (PKS) and Empty Fruit Bunch (EFB) pellets, in coal-fired power plants (PLTU) in Riau, Indonesia, to support a sustainable energy transition. Empirical tests were conducted at PLTU Tenayan and Tembilahan, using biomass substitution rates of 5% and 50%, respectively. Key performance indicators, including Specific Fuel Consumption (SFC), Net Plant Heat Rate (NPHR), production cost, and exhaust emissions (SO₂ and NOₓ), were analyzed. Results show that 5% PKS co-firing at PLTU Tenayan reduced SFC from 0.871 to 0.856 kg/kWh and NPHR from 4,187 to 4,116 kCal/kWh, while 50% PKS co-firing at PLTU Tembilahan decreased SFC from 1.171 to 0.785 kg/kWh and NPHR from 5,312 to 3,625 kCal/kWh. Economically, PKS co-firing resulted in cost savings of up to Rp223.58/kWh. Emission measurements revealed SO₂ reductions up to 27.8% at PLTU Tenayan and 34% at PLTU Tembilahan (EFB scenario), with NOₓ emissions remaining stable or decreasing by up to 13%. Conversely, EFB pellet co-firing increased fuel consumption and production costs due to higher fuel prices and operational challenges. The study confirms that PKS co-firing is a viable and effective approach to enhance power plant efficiency, reduce emissions, and lower costs in palm oil-producing regions. Limitations include short test durations and limited plant sites; therefore, long-term monitoring is recommended to assess boiler integrity, operational stability, and emission performance for sustainable large-scale implementation. This research provides critical technical, economic, and environmental insights for advancing biomass co-firing in commercial coal power plants.
Kaji eksperimental pengaruh variasi impeller terhadap kinerja pump as turbine Asral
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/ag1jc221

Abstract

The increasing demand for electrical energy has driven the utilization of renewable energy sources, one of which is water energy. Centrifugal pumps operated in reverse as Pump as Turbine (PAT) are a simple and economical solution for small-scale power plants. This study analyzes the effect of impeller shape variations open, half closed, and fully closed on PAT performance through experimental testing with valve opening variations (50–100%) and electrical loads (30-300 watts). The parameters observed include flow rate, rotational speed, and hydraulic efficiency. The results show that the open impeller produces the largest flow rate (63.369 m³/h), the semi closed impeller has the highest rotational speed (1958 rpm), while the fully closed impeller provides the highest efficiency (58%). The impeller shape has been proven to have a significant effect on PAT performance, particularly in increasing energy conversion efficiency. This research contributes to the selection of optimal impeller designs for small-scale hydroelectric power generation systems and the development of more efficient renewable energy technologies
Co-Authors Adillah Rahmatul Ummi Agustina, Dinni Alexirsandi Pardede, Chris Alfianti, Yunita Nur Amalda Syahraemy Panggabean Amanda Septia Kirana Anita Susilawati Aulia Ramadhan Awaludin Martin Dian Ramadani, Anggita Dimas Permana Lubis Dodi Sofyan Arief, Dodi Sofyan Fadillah, Naufal Fransiskus Sitanggang , Lois Hanifa, Fadjriya harisandi, Prasetyo Heru Mulyanto Isramilda, Isramilda Karyono Lukluk Ul Masykuroh Maemunah, Omah Maharani, Karina Dwi Mardiputra, Ilham Muhammad Mia Firauhinnur Nining Yuningsih Pisko, Azkiando Prasetyo Harisandi Ramadhani, Nabilla Ranjuswari, Aninda Reni Febriani Rizky Srikandi Romarito Gesi Caloria Manurung Ropina Emwarjati Sihombing Rosianna Purba Sahreni, Sukma Sellina, Sesri Siti Fatimah Srirahma Yani, Nadia Supriyati Tsalasa Yuningsih , Intan Tumanggor, Neni Nora Widya Putri, Azzahra Widyastuti, Desma Alsheka Yahya, Adibah Yuliana Suryani, Ike Zahwa Khairani Azhar Zikri Anugerah