Article Per Year (5 Year)
p-Index From 2021 - 2026
0.817
P-Index
This Author published in this journals
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
Unknown Affiliation
Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

Published : 11 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 11 Documents
Search

 1   2 
Rancang Bangun Turbin Angin Sumbu Horizontal Dengan Tipe Bilah Inverse Taper Berbahan Dasar Komposit Serat Tandan Kosong Sawit Damanik, Reinhard Parulian; Agustina, Dinni; Martin, Awaludin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Overcome the use of fossil fuel based power plants is improving annually and waste in Indonesia palm that cannot be used again, it is the basis for this research through the planning and manufacturing of wind turbine blades of elementary substance composite fibers of empty palm. As for the wind turbine blades designed to be adapted for areas with low wind speeds, the blade is made with an inverse taper type that can convert wind energy into a rotor round with a large torque. The type of airfoil used is NACA 4415 with increasing the chord thickness percentage by 30%. The result of the calculation, obtained radius blade 1,1m and hub 0,2m with the number of blades 5. In the making of blades, the fibre of empty palm is given alkaline treatment with a 3% NaOH rate of 2 hours. Composites made with 5% fiber content of epoxy resin with the length of fiber used is 30mm. Based on the aerodynamic simulation results using Qblade applications, the blade can generate 318W of power at 7m/s wind speeds with blade rotation speed 120rpm. Keyword: Inverse Taper, Fibre Bunch of Empty Palm
Uji Kinerja Turbin Angin Sumbu Horizontal Dengan Tipe Bilah Inverse Taper Dengan Jari-Jari 1,3m Pada Kecepatan Angin Di Pekanbaru Sibuea, Edwin Reinaldy; Agustina, Dinni; Martin, Awaludin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

The increasing needs of electrical energy and the limited amount of fossil fuel that keep reducing give a huge effect to the enhancement of renewable wind energy to grows rapidly, one of it is wind turbine. The purpose of this research is to study the performance of horizontal axis wind turbine with inverse taper blade. The wind turbine is place on a building with ±15m. The output power is measured under loading condition with 4.37 kg load. Acquired data were wind velocity, air temperature, constant load, and the shaft rotation speed. The result of the power test is 0.49 watt under wind velocity of 2.92 m/s and Tip Speed Ratio (TSR) 0.056 Keyword: Wind turbine, wind speed, inverse taper, TSR
Kaji Eksperimental Alat Pendingin Termoakustik Dengan Panjang Tabung Resonator λ/2 Dan λ/4 Deviawan, Damar Agung; Agustina, Dinni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Thermoacoustic is a system that converets energy from high amplitude sound waves into heat energy which produces temperature differences or vice versa, each of which can be used for heat engines and heat pump. This combination of pressure and temperature oscillastion will cause a thermoacoustic phenomenon, acoustic power input provided by a loudspeaker (driver) in the form of high amplitude soundwaves. In this study using λ/2 and λ/4 resonator tubes with a length of 80 cm and 60 cm. For the position of the stack in this study that is at the position of the tip farthest end of the sound source or loudspeaker box (stack position 2), and the position of the stack at the closest end of the sound source or loudspeaker box (stack position 1). From the analysis results obtained temperature differences on both sides of the stack that is on stack position 1 resonator tube λ / 2 2.69 C, on stack position 2 resonator tubes λ / 2 2.81 C, while on stack position 1 tube λ / 4 4.14 C and stack position 2 resonator tubes λ / 4 5.15 C. stack position influences the occurrence of thermoacoustic phenomena, the better position is stack position 2 because the greatest amplitude occurs in the position farthest from the sound source. Keyword: Refrigeration, thermoacoustic, stack, resonator
Perencanaan Dan Pembuatan Alat Uji Pemipaan untuk Menganalisis Kehilangan Tekanan dengan Menggunakan Software Pipe Flow Expert Dinni Agustina; Ratna Sary; Martunis Martunis
Jurnal Teknik Mesin Unsyiah Vol 6, No 1 (2018)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v6i1.18223

Abstract

The most dominant water distribution system used is the preparation system, in which each system has its respective advantages and disadvantages, where the weakness of the piping system is the unavoidable pressure loss caused by the connection factor and the surface roughness of the material used. Head losses are a flow loss phenomenon within the piping system. Head losses overall on 12.1 m piping system, This value can be from the sum of head losses on the pipe diameter of 25.4 mm with a length of 3400 mm of 0.0786 m. Head losses on pipe diameter 19 mm with length 3800 mm at 1.52 m and head losses at pipe diameter 12,7 mm with length 2800 mm equal to 10,59 m. The pressure in main pipe is 1,12 atm and pressure at output valve Water 1 atm based on the calculation method, the flow velocity in the main pipe 1 m/s, the speed in the second pipe 1.76 m/s, the speed in the last pipe of 3.34 m/s. Pipe used is PVC with diameter 1 inch, ¾ inch, and ½ inch. While the model pipe flow expert program 5.12 pressure on the main pipe of 1.18 atm, the pressure at the end of the valve 1 atm, the speed in the main pipe 1.077 m/s, the speed in the second pipe of 1.79 m/s, and the speed In the last pipe 3.3 m/s. The difference in velocity between modeling and calculation is due to the difference in internal diameter of the model by calculation, where the difference in value is 0.2 mm. The water debit generated from the test equipment is 1.3 m3/h, while using the software of 1.8 m3/h. The difference between the results of the experiment and modeling if the percentage of 270/0 is suppressed.
Pengaruh Cuaca Berawan terhadap Pengeringan Kelapa Kukur sebagai Bahan Kelapa Gongseng dengan Sistem Solar Drying Dinni Agustina; Ratna Sary; Muhammad Iqbal
Jurnal Teknik Mesin Unsyiah Vol 2, No 2 (2014)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17.41 KB)

Abstract

Dessicated coconut is the main ingredient in the manufacture of coconut ‘gongseng’ spices. Traditional methods of drying  the grated cocont directly in the sun have constraints  such as relatively longer drying time, products hygiene and supervisory personnel. Solar dryers conditioning system with a solar collector has been developed to overcome these constraints and tested in Lamlhom area, Aceh Besar. The research objective was to determine the effect of cloudy weather on the performance of solar drying system in term of the moisture content  and the qualityof the ddessicated coconut. Tests carried out in the temperature range of 30°C - 60°C in a state of clear and cloudy weather. Tests comparing the two samples of coconut grater with a weight of 2 kg and 4 kg at two  weather condition;sunny and cloudy. The experimental results of both samples on sunny and cloudy weather conditions indicate that the water content of the coconut water is still in the range of moisture content standards set by SNI 01-375-2000 which is maximum moisture content of 3%.
Pemanfaatan panas kondenser pada pengering beku vakum Dinni Agustina; Roe Dwi Dhewaji; Awaluddin Martin
Jurnal Energi Dan Manufaktur Vol 13 No 1 (2020)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JEM.2020.v13.i01.p06

Abstract

Pengering beku vakum (Freeze vacuum drying) merupakan salah satu metode pengeringan terbaik untuk pengawetan bahan makanan. Selain menjadi salah satu solusi untuk teknologi pasca panen, freeze vacuum drying juga mampu untuk meningkatkan nilai jual suatu produk. Penelitian ini bertujuan untuk mengembangkan pengering beku vakum yang menggunakan sistem pemanasan mandiri (self heating system) dengan pemanfaatan panas kondenser. Pada awal penelitian tanpa proses secondary drying dibutuhkan waktu 24 jam untuk menghilangkan kadar air sebanyak 62% dari produk dengan temperature -5oC. Penelitian berikutnya dengan memanfaatkan panas buang kondenser dan menggunakan proses secondary drying dibutuhkan waktu 4 jam untuk mengurangi kadar air pada produk sebesar 78% pada temperature -9oC. Freeze vacuum drying is one of the best drying methods for food preservation. Besides being one of the solutions for post-harvest technology, freeze vacuum drying is also able to increase the sale value of a product. The aim of this research is to develop a freeze vacuum drying using a self-heating system by utilizing a heat of condenser. At the beginning of the research without secondary drying process, it took 24 hours to remove 62% of water content from products with a temperature of -5oC. In further research by utilized waste heat of condenser and by using secondary drying process, it took 4 hour to reduce 78% moisture content of product at -9oC.
Prestasi Alat Pendingin Termoakustik Dengan Variasi Bentuk Stack Mitha Tri Indraswari; Dinni Agustina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

The use of conventional cooling machines that have an impact on the environment because it uses refrigerant gas containing CFC and HFC gases that are harmful to the atmosphere. One alternative to the cooling machine is a thermoacoustic cooling system. The thermoacoustic cooling system is a system that converts high-amplitude sound waves into heat energy which produces temperature changes. This system is called environmentally friendly because it uses air conditioning or noble gas cooling media. The main components of the thermoacoustic system are the resonator tube, the stack, the working fluid and the loudspeaker. In this study the working fluid used is air. The shape of the stack and stack position affect the performance of the cooling device. Thermoacoustic cooling devices using a stack of mica plastic material with a thickness of 0.5 mm and a length of 9 cm have been designed and operated on a resonator tube with a diameter of 5 cm and a length of 60 cm. The test was carried out experimentally using a loudspeaker sound source at a resonant frequency of 145 Hz. The ability of the cooling device based on results of the stack plate parallel produces a temperature difference at both ends of the stack of 4.31OC at 28OC ambient temperature. Keywords:Thermoacoustic, cooling device, COP
Pengembangan Freeze Vacuum Drying Dengan Sistem Kendali Menggunakan Reverse Valve Martin, Awaludin; Hermanto, Jheri; Agustina, Dinni; Surianto, Muhammad Akbar; Putri, Sunny Ineza; Khotimah, Nur
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3845

Abstract

The post-harvest handling process for rice aims to reduce the water content of rice grain, one of which is using the drying method. To maintain the quality of grain, evaluation and corrections are needed in handling so that losses can be minimized. Mechanical drying methods such as freeze drying are an effective vacuum solution, because they combine freeze drying and vacuum drying which have advantages in efficiency and quality of results. This vacuum dryer prototype has a maximum capacity of 10 kg of rice, the refrigerant used is R-134a, and the vacuum pressure that can be achieved is 5 bar below atmospheric pressure. This research will use variations in mass of 1 kg, 5 kg, and 10 kg, then the mass of 10 kg will be varied with refrigerant pressure of 14 bar, 15 bar, and 16 bar. The results of this test are that for the mass variation of 1 kg the air content that can be removed is 89% for 12.1 hours, for the mass of 5 kg the air content that can be removed is 85% for 15.3 hours, and for the mass of 10 kg the air content that can be removed is 76% for 17.5 hours. For variations in refrigerant pressure at a pressure of 16 bar 78% of the air content is lost for 19.8 hours, 15 bar 76% of the air content is lost for 19 hours, and 14 bar 62% of the air content is lost for 18 hours
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