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All Journal Jurnal Keteknikan Pertanian Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Teknik Mesin Indonesia
Dyah Wulandani
Departemen Teknik Mesin Dan Biosistem, Fakultas Teknologi Pertanian, Institut Pertanian Bogor
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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 1 
Orifice Analysis in Biodiesel Reactor with Hydrodynamic Cavitation System using Computational Fluid Dynamics Yayan Heryana Heryana; Dyah Wulandani; Supriyanto Supriyanto
Jurnal Keteknikan Pertanian Vol. 10 No. 1 (2022): April 2022
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.010.1.85-94

Abstract

Teknologi reaktor untuk proses transesterifikasi minyak nabati atau lemak hewani dengan metanoltelah banyak dikembangkan, dengan tujuan mendapatkan hasil biodiesel yang sesuai standar namundengan biaya yang seminimal mungkin. Reaktor kavitasi hidrodinamik tipe orifice merupakan alternatifpilihan untuk tujuan tersebut. Penelitian ini bertujuan menentukan desain orifice optimal dari beberapadesain orifice yang diuji melalui simulasi CFD. Penelitian ini menggunakan metode simulasi daneksperimental. Simulasi komputer yang dilakukan terhadap orifice A (2 lubang dengan diameter 2 mm), B(4 lubang dengan diameter 1,5 mm), C (9 lubang dengan diameter 1 mm) dan D (37 lubang dengandiameter 0,5 mm) menggunakan model Schnerr dan Sauer menunjukkan bahwa orifice C merupakanyang optimal menghasilkan kavitasi pada kondisi tekanan absolut inlet 3x105 N/m2 dengan penggunaanfluida metanol. Hal tersebut berdasarkan parameter yang diteliti yaitu kecepatan, tekanan, energi kinetikturbulen dan fraksi volume uap. Pada tekanan absolut inlet 3x105 N/m2 diperoleh kecepatan maksimum28,69 m/s, tekanan minimum 12266 N/m2, fraksi volume uap maksimum 0,98 dan energi kinetik turbulenmaksimum 12,75 m2/s2. Hasil simulasi tersebut dibandingkan dengan eksperimen yang dilakukan padareaktor kavitasi hidrodinamik menggunakan orifice C dan D. Pengukuran yang dilakukan terhadapparameter kecepatan dan tekanan menunjukkan tidak terjadi penyimpangan yang signifikan antara hasilsimulasi komputer dan eksperimen.
Kajian Pola Aliran dalam Reaktor Biodiesel dengan 4 Tipe Agitator melalui Simulasi Computational Fluid Dynamics Sahrun Dongoran; Dyah Wulandani; Desrial Desrial
Jurnal Keteknikan Pertanian Vol. 10 No. 2 (2022): Agustus 2022
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.010.2.133-144

Abstract

Biodiesel is formed by transesterification reaction of vegetable or animal fatty acid with alcohol. Agitation of fluid in the biodiesel reactor is required for occurring of the transesterification reaction. This research aims to study the flow behaviour in reactor with different type of agitator using computational fluid dynamics simulation and determine the optimum type of agitator in biodiesel production. Flow behaviour which was studied includes temperature and fraction distribution, turbulence intensity, and vorticity of fluid. The study was conducted in transient and steady state simulation with agitation types of helical screw, turbine, propeller, and anchor. The material that was modelled consist of cooking oil and methanol with mole ratio of 1:6. The mixing process used 500 rpm agitation speed and 60-65 oC mixing temperature. Furthermore, to determine the optimum agitator, the analytical hierarchy process method was carried out. The simulation results were analysed then obtained the score of each agitator, which were 0.314 (anchor), 0.350 (helical screw), 0.249 (propeller) and 0.087 (turbine). Based on the result, the optimum agitator was the helical screw type.
Utilization of Crude Glycerol Waste from Biodiesel Production as an Additive to Improve the Quality of Tea Dreg Biopellet Lilis Sucahyo; Imelda Hellen ABR Sembiring; Dyah Wulandani
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 12, No 3 (2023): September 2023
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v12i3.571-582

Abstract

Biodiesel production using the transesterification method generates a large amount of crude glycerol as by-products. Crude glycerol waste can be reused and utilized as an additive in the formulation of biopellet. Tea dregs are a waste produced by the beverages industry that can be used as green fuel in the form of biopellet as an environmentally friendly energy source. This study aims to analyze and characterize biopellet from tea dregs with crude glycerol as an additive to increase the quality. The biopellet formulation contains six levels of crude glycerol composition percentage: 0% (as control), 5%, 10%, 15%, 20%, and 25%. The parameters for the quality assessment of biopellet refer to the SNI 8675:2018 standard. The best formulation of biopellet was obtained in the 10% treatment with properties of density value of 0.93 g/cm3, pellet durability of 98.09%, moisture content of 8.10%, volatile matter content of 73.37%, ash content of 6.08% and calorific value of 16.38 MJ/kg. The addition of up to 10% crude glycerol as an additive has been shown to improve the quality of tea dregs biopellet. Keywords:  Additive, Biopellet, Crude glycerol, Tea dregs.
Analisis keseragaman kolektor surya pelat datar glazed dan unglazed Efendi, Rustam; Nelwan, Leopold Oscar; Wulandani, Dyah
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.599

Abstract

Solar collectors, as a means of converting solar energy into thermal energy, are the focus of this study. Two types of solar collectors used, namely glazed flat plates (KSPDG) and unglazed flat plates (KSPDU), are tested to evaluate uniformity of performance. The study was conducted using a testing setup that included a tank, water pump, thermocouple, flowmeter, anemometer, and pyranometer. Uniformity testing is performed by analyzing inlet temperature, outlet temperature, ambient temperature, and solar irradiation during 8 hours of testing. Test results show that both types of solar collectors show similar trends in performance, with increases in water temperature aligned with increased solar irradiation. Statistical analysis shows a similar level of uniformity between KSPDU I and KSPDU II, as well as between KSPDG I, KSPDG II, and KSPDG III.
Influence of Temperature and Sweating Duration on The Quality of Vanilla (Vanilla planifolia Andrews) Farida Kurniasari; I Wayan Budiastra; Dyah Wulandani
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 14, No 2 (2025): April 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i2.458-466

Abstract

Indonesia has significant potential for vanilla production. However, in terms of quality, Indonesian dried vanilla still has a low standard, one of the factors being the suboptimal post-harvest technology, particularly in the sweating process. This research aims to determine the optimal temperature and sweating duration to achieve the best vanilla quality in accordance with the Indonesian National Standard (SNI). After the harvesting process, the vanilla pods were treated by soaking them in warm water at a temperature of 65°C for 3 minutes. After the vanilla pods were wilted, they were wrapped using a combination of a towel cloth-black cloth-burlap. They were then sweated in an incubator at 40°C with 70% RH and 45°C with 70% RH for 2, 4, and 6 days. The observed vanilla quality parameters include weight loss, color, hedonic tests (aroma and color), vanillin content based on the methods of SNI 01-0010-2002 and ash content based on the methods of AOAC. The result shows that the optimal temperature and duration for sweating in an incubator are 40°C and 4 days. Keywords: Postharvest, Quality, Sweating, Vanilla, Vanillin.
Application of Ice Gel For Edible Flowers Distribution Packaging of Butterfly Pea Darmawati, Emmy; Wulandani, Dyah; Ulya, Kamila Nikmatul
Jurnal Keteknikan Pertanian Vol. 12 No. 2 (2024): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.012.2.172-183

Abstract

Butterfly pea (Clitoria ternatea) is a popular edible flower in Indonesia that is rich in antioxidants. However, they are perishable and sensitive to temperature changes during storage and transportation. The use of ice gel in distribution packaging has been identified as an effective solution to maintain its quality. This study aimed to determine the optimal positioning of ice gel in two types of distribution packaging: a Styrofoam box and an insulated box. The experiment involved cooling 36 g of flowers per distribution package over 2 h of simulation using six pieces of ice gel at two different positions (positions 1 and 2). The results showed that the ice gel placed in position 2 reduced the temperature inside the packaging more rapidly and maintained the lowest temperature for a longer period than the ice gel placed in position 1. Therefore, placing the ice gel in position 2 is the best option for application in the distribution package. Ice gel position 2 can reduce the flower’s temperature from 20°C to 10.7°C in the Styrofoam box and from 20oC to 11°C in the insulated box during simulation.
Rice Husk Availability Mapping as Biomass Cofiring Material at Power Plant in Indramayu Swastika, Abdul Baits Dehana Padma; Liyantono, Liyantono; Wulandani, Dyah
Jurnal Keteknikan Pertanian Vol. 12 No. 2 (2024): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.012.2.284-300

Abstract

Indonesia berencana untuk mengurangi emisi gas rumah kaca (GRK) sebesar 29% pada tahun 2030 untuk mengatasi penggunaan energi fosil yang tinggi. Salah satu strateginya adalah PT PLN mengimplementasikan teknologi pembakaran biomassa di 52 pembangkit listrik pada tahun 2025. Namun, keberlanjutan pasokan menjadi tantangan tersendiri, dengan penelitian yang belum memadai dan hanya 33,52% yang tercatat di pabrik penggilingan. Penelitian ini menghitung ketersediaan sekam padi untuk pembakaran biomassa di Kabupaten Indramayu, daerah penghasil beras terbesar di Indonesia. Dengan menggunakan pendekatan spasial, survei, wawancara, dan Quantum GIS (QGIS) versi 3.22.12, peta visual ketersediaan sekam padi dibuat. Data dari 95 penggilingan padi (79 kecil, 12 menengah, 4 besar) menunjukkan potensi sekam harian masing-masing sebesar 0,87, 4,83, dan 10,74 ton. Data produksi nasional memperkirakan ketersediaan sekam padi tahunan sebesar 272.106 ton. Analisis spasial dari survei dan wawancara mengindikasikan 601.669 ton/tahun, sementara distribusi menurut skala penggilingan menunjukkan 588.861 ton/tahun. Persaingan penggunaan sekam padi cukup tinggi untuk industri seperti genteng, batu bata, dan semen, dengan fraksi pemulihan sebesar 13,23%, 17,50%, dan 23,33% pada saat panen, serta 3,90%, 10%, dan 15% pada saat tidak panen. Sekam padi yang tersedia di Indramayu untuk bahan bakar biomassa adalah 77.102,17 ton/tahun. Jumlah ini berkontribusi sebesar 0,78% terhadap kebutuhan biomassa nasional dan 45,56% terhadap kebutuhan PLTU Indramayu. Kebijakan yang mendorong penggunaan dan pengelolaan sekam padi di daerah penghasil padi diperlukan untuk meningkatkan implementasi pembakaran biomassa.
Shelf-life Estimation of Dried Chili in Vacuum Packaging Ranawati, Nanda Wisha; Ahmad, Usman; Wulandani, Dyah
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 1 (2024): March 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i1.60-70

Abstract

This research aimed to build a model for estimating the shelf life of dried chilies in vacuum packaging stored at any storage temperature. The shelf-life estimation of dried red chilies was carried out based on the change rate of dried chilies quality parameters using the ASLT (Accelerated Shelf-Life Testing) method with the Arrhenius approach. The shelf-life estimation using the ASLT method was carried out by conditioning the storage room, which could accelerate the degradation reaction, stored at temperatures above room temperature. Prior to storage, red chilies were dried until their moisture content reaches 10%. Then it was packaged in vacuum packaging made of PE (polyethylene) plastic and stored at 35°C. During the storage period, the observation was conducted on some quality parameters, namely moisture content, color, and vitamin C content. The same experiments were also carried out at 40°C, 45°C, and 50°C to obtain different rate constant values. The shelf-life estimation results from the Arrhenius equation model were selected based on the critical parameter, in this study the critical parameter was the decrease of vitamin C content. The shelf life of dried red chilies that were packed in vacuum stored at room temperature (25°C) could maintain its quality up to 365 days. Keywords:  Arrhenius,  ASLT,  Red chili,  Vacuum packaging,  Shelf life, 
Influence of Temperature and Sweating Duration on The Quality of Vanilla (Vanilla planifolia Andrews) Kurniasari, Farida; Budiastra, I Wayan; Wulandani, Dyah
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 2 (2025): April 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i2.458-466

Abstract

Indonesia has significant potential for vanilla production. However, in terms of quality, Indonesian dried vanilla still has a low standard, one of the factors being the suboptimal post-harvest technology, particularly in the sweating process. This research aims to determine the optimal temperature and sweating duration to achieve the best vanilla quality in accordance with the Indonesian National Standard (SNI). After the harvesting process, the vanilla pods were treated by soaking them in warm water at a temperature of 65°C for 3 minutes. After the vanilla pods were wilted, they were wrapped using a combination of a towel cloth-black cloth-burlap. They were then sweated in an incubator at 40°C with 70% RH and 45°C with 70% RH for 2, 4, and 6 days. The observed vanilla quality parameters include weight loss, color, hedonic tests (aroma and color), vanillin content based on the methods of SNI 01-0010-2002 and ash content based on the methods of AOAC. The result shows that the optimal temperature and duration for sweating in an incubator are 40°C and 4 days. Keywords: Postharvest, Quality, Sweating, Vanilla, Vanillin.
Co-Authors Desrial Emmy Darmawati Farida Kurniasari I Wayan Budiastra Imelda Hellen ABR Sembiring Kurniasari, Farida Lilis Sucahyo Liyantono . Nelwan, Leopold Oscar Ranawati, Nanda Wisha Rustam Efendi Sahrun Dongoran Supriyanto Supriyanto Swastika, Abdul Baits Dehana Padma Ulya, Kamila Nikmatul Usman Ahmad Yayan Heryana Heryana