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All Journal Jurnal Energi Dan Manufaktur Jurnal Teknik Mesin Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Turbo : Jurnal Program Studi Teknik Mesin Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Prosiding SNTTM
Agustina, Dinni
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Experimental study of freeze vacuum drying with thermal energy storage for drying 2 kg aloe vera Adriyandy, Warits; Cahyati, Wulan; Agustina, Dinni; Martin, Awaludin
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/bp8zfz47

Abstract

One of the widely used post-harvest processing methods for aloe vera is drying, given its high water content. An effective drying method is vacuum freeze-drying, although this method has a drawback in energy efficiency. This research examines the use of paraffin wax as a Thermal Energy Storage (TES) medium to utilize waste heat from the condenser during the freezing phase in a vacuum freeze-drying system. The results of the study show that the use of TES consistently improves drying efficiency and energy savings. The system with TES was able to remove a higher moisture content compared to the test without TES, at 68% for a 2 kg load versus 58.57% without TES. In addition, the Coefficient of Performance (COP) for the system with TES was recorded at 2.23, which is higher than the 2.08 without TES. The use of TES for 2 kg also resulted in an electrical energy saving of 259 Wh. Thus, TES in a vacuum freeze-drying system is effective in enhancing energy efficiency, reducing power consumption, and improving the drying performance of aloe vera.
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.
Co-Authors Adriyandy, Warits Anita Susilawati Asral Aulia Ramadhan Awaluddin Martin Awaludin Martin Cahyati, Wulan Damanik, Reinhard Parulian Deviawan, Damar Agung Dodi Sofyan Arief, Dodi Sofyan Farida Isroani Jheri Hermanto Khotimah, Nur Martunis Martunis Mitha Tri Indraswari Muhammad Sholihin Ratna Sary Ratna Sary Roe Dwi Dhewaji Sibuea, Edwin Reinaldy Sunny Ineza Putri Surianto, Muhammad Akbar