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Sutini Pujiastuti Lestari
Politeknik Negeri Sriwijaya
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RANCANG BANGUN ALAT PENGERING TIPE TRAY DENGAN MEDIA UDARA PANAS DITINJAU DARI LAMA WAKTU PENGERINGAN TERHADAP EXERGI PADA ALAT HEAT EXCHANGER Mahardhika, Lintang Putri; Lestari, Sutini Pujiastuti; Bow, Yohandri
KINETIKA Vol. 7 No. 1 (2016): KINETIKA 01032016
Publisher : Politeknik Negeri Sriwijaya

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Abstract

Drying is one way to remove or eliminate some of the water of a substance by evaporating most of the water contained through evaporation heat energy. The purpose of this research was to determine the length of time the drying of the moisture content of crackers and aware of any changes exergy of steam and changes exergy of air in the heat exchanger tools during the drying process. Exergy can be defined as the maximum employment potential in the form of material or energy that interacts with the environment. The longer the drying time then changes exergy of steam and changes exergy of air generated increased, this is due to the heat lost from the boiler so that it can affect the heat that will be up to the drying chamber. The more amount of the change exergy of steam and changes exergy of air, the lower the content of water in crackers. The water content in the crackers meet the standards of ISO 2713.1: 2009. At the time of 6 hours produces water content of 12.20%, at a time of 6.5 hours to produce 11.64% moisture content, at the time of 7 hours to produce 11.29% moisture content.
UTILIZATION OF PLASTIC WASTE INTO LIQUID FUELS Lestari, Sutini Pujiastuti
KINETIKA Vol 3, No 3 (2012): KINETIKA 01112012
Publisher : Teknik Kimia Politeknik Negeri Sriwijaya

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Abstract

The production of plastic waste in Indonesia in increasing from year to year. Along with that, then the unused plastic waste in the environment increases. Thgis problem is greated because of the plasic waste can not decompose easily, if only just left. Therefore, efforts are needed to convert plastic waste into liquid fuel that is by catalytic pyrolisis. The volume of piroligneuos liquid (obtained) was  mearsuredand it?s physical properties were analyzed. The analys include distillation ASTM, spgr, and 0API. From the data obtained showed that pyrolysis catalysts are able to increase the pyrolysis process by lowering the temperature and time of decomposition, so the maximum liquid fuel was obtained at 0,024 weight fraction of catalyst, and in the temperature range below 3500C obtained result could reach more than 50%. The optimum temperature of pyrolyzing plastic waste into liquid fuel was 3290C, and the weight fraction of bentonite catalyst was 0,024. from the analysis of ASTM (D-86) there were there component of pyroligneus liquid, there are gasoline, kerosene, and diesel. From the result of analizing showed the pyroligneous liquid had spgr was 0,7702 near with spgr of gasoline with octane number 91 among 0,715-0,780. 0API result was 52,2185 or near with 0API of gasoline.
PROTOTYPE PENGERING BAHAN BAKU DAN PRODUK BIOPELET DITINJAU DARI ENERGI H2O YANG TERUAPKAN KE UDARA Lestari, Sutini Pujiastuti; Aswan, Arizal; Sumarna, Herlin
KINETIKA Vol. 10 No. 1 (2019): KINETIKA 01032019
Publisher : Politeknik Negeri Sriwijaya

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Abstract

Energy consumption in Indonesia is still dominated by the use of fossil-based energy, especially petroleum and coal. Therefore, biomass as a renewable energy source is an effort to reduce the use of fossil energy in Indonesia. Biopellet is one of the processing of biomass into solid fuel. In the process stage of making biopellet used dryer. In the prototype of drying machine, the independent variables are variation of raw material mix and fixed variable such as air velocity, drying time, and drying temperature. Based on the results of the research, the H2O concentration was evaporated and the H2O heat in the air was highest in the 60% mixture of wood powder: 40% rice husk. From mass of H2O evaporated equal to 14.84 gr and H2O heat in air equal to 136.506 grcal analyzed moisture content and calorific value of biopelet product. Water content obtained at 6.716% and the calorific value of 5,188.8506 grcal/gr has met the SNI 8021-2014 standard.
PRODUKSI BAHAN BAKAR CAIR DARI LEMAK SAPI MENGGUNAKAN KATALIS ZEOLIT DENGAN METODE PIROLISIS Lestari, Sutini Pujiastuti; Aswan, Arizal; Effendy, Sahrul; Febriana, Ida; Ramadhana. S, Safira Eva; Safitri, Widi; Shaskia, Bekka Alta
KINETIKA Vol. 11 No. 2 (2020): KINETIKA 01072020
Publisher : Politeknik Negeri Sriwijaya

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Abstract

Beef tallow is structurally a monoalkyl ester of long chain fatty acids similar to vegetable oil which are widely used as raw materials for biofuel production. The processing of beef tallow into liquid fuel is from pyrolisis process of the catalytic cracking method with 1%w/w and 5% natural zeolite catalyst. The purpose of this research is to get the best operating condition that produce the largest %yield of liquid fuel with temperature range 280-320oC and time range 60-140 minutes. The result shown that the optimum temperature is 320oC using 5% catalyst with product yield of 12.4206 %. The optimum time operation is 100 Minutes using 5% catalyst with product yield 11.51%Also the best operating condition using 1% catalyst are at temperature of 320°C and 60 minutes with11.86% of yield. Physical character from this research aredensity, kinematic viscosity,and flash point shown that liquid fuel product obtain solar. Chemical compound in liquid fuel of this research are 18.26% of gasoline fraction (C7–C11) and 41.33% of kerosene/diesel (C12–C19) for 1% catalyst and 40.67% of gasoline fraction (C7–C11) and 47.11% of kerosene/diesel (C12–C19) for 5% catalyst.
PENGARUH LEVEL KETINGGIAN AIR TERHADAP SATURATED STEAM PADA CROSS SECTION WATER TUBE BOILER MENGGUNAKAN BAHAN BAKAR GAS DAN SOLAR Manggala, Agus; ., Fatria; Lestari, Sutini Pujiastuti; Naim, Barokallah Muhammad; Sastama, Nanda
KINETIKA Vol. 11 No. 2 (2020): KINETIKA 01072020
Publisher : Politeknik Negeri Sriwijaya

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Abstract

A boiler is a device that serves to heat water to become high pressure and high temperature steam, using heat from the combustion of fuel in the combustion chamber. The growth of the domestic boiler industry will develop with research on boiler technology. One of the parameters of the steam produced is temperature and pressure. It is necessary to have the right water level in the steam production process to get saturated steam which is in accordance with the theory, which is in the range of 150-374ËšC. The results of the research show that the optimal water level is the 4th condition (60%) because it can produce saturated steam according to the pressure target with a constant state in a continuous process using diesel and gas fuel.
PENGARUH RASIO UDARA BAHAN BAKAR SOLAR DAN GAS TERHADAP KUALITAS SATURATED STEAM PADA SISTEM TWO DRUM WATER TUBE BOILER Rusnadi, Irawan; ., Fatria; Zikri, Ahmad; Lestari, Sutini Pujiastuti; Alvino, Raudi; Jaya, Julian Indra
KINETIKA Vol. 11 No. 2 (2020): KINETIKA 01072020
Publisher : Politeknik Negeri Sriwijaya

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Abstract

A boiler is an equipment used to produce steam for various purposes. In this case, the boiler used also often has problems that cause less than optimal steam results. The obstacle that occurs is usually the ratio of air to fuel which causes the combustion results to be not optimal and imperfect so that it has an impact on the production and quality of the steam produced. One of the parameters of the steam produced is temperature and pressure. Both will relate to the enthalpy of steam as a measure to determine the value of the energy contained in the steam. Therefore, this research focuses on determining the most optimal and precise ratio of air to diesel fuel and gas so that maximum combustion results are obtained. The air-to-fuel ratio which is the variable for diesels are 123.67, 128.33, 133.00, 137.67, 142.33 and for gas are 29.16, 29.44, 29.71, 29.99 and 30.26. In the resulting data, the fourth of the air fuel ratio of diesel fuel which is more optimal and precise, which is 137.67 and 29.99 for gas with the resulting value of temperature is 151oC, pressure is 5 bar and the value of the saturated steam quality is 0.7993 ≈ 0.8.
imulasi Prototype Pembangkit Listrik Tenaga Mikrohidro Turbin Crossflow Ditinjau dari Ketinggian, Debit dan Arah Aliran Ridwan, K.A; Lestari, Sutini Pujiastuti; Rusnadi, Irawan; ., Erlinawati; Rahayu, Atika; Mahendra, Evando; Pratama, Wahyudi
KINETIKA Vol. 12 No. 1 (2021): KINETIKA 01032021
Publisher : Politeknik Negeri Sriwijaya

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Abstract

The energy crisis prompted the Indonesian government to change the paradigm towards new and renewable energy, from alternative energy to main energy. In order to overcome the electrical energy crisis, then conducted research on new and renewable energy. Utilization of microhydro based energy generation into one solution to be applied in effort to overcome this crisis. Microhydro power plant (PLTMH) is carried out by utilizing flow velocity (river flow) or head potential (waterfall) with water turbine connected to a generator so that it can convert mechanical energy from the turbine into electrical energy. Type of turbine used is crossflow turbine. This simulation is by varying the head potential (1.6 m, 1.8m, 2 m, 2.2 m, 2.4 m) and the direction of flow (horizontal overshoot, vertical overshoot, and undershoot) generated electrical energy. Based on the research results, the optimal flow direction horizontal overshoot flow which produces flow discharge 20 liter/min, the electrical energy 16 watt, and at height of 2.4 meters and the electrical energy15.3 watt.
RANCANG BANGUN ALAT PENCETAK BIOBRIKET CAMPURAN AMPAS TEH TEMPURUNG KELAPA DITINJAU DARI WAKTU KARBONISASI TERHADAP NILAI KALOR DAN KADAR AIR Pratiwi S, Anggun; Situmeang, Ricky Samuel; Lestari, Sutini Pujiastuti; Effendy. A., Sahrul; Manggala, Agus
Jurnal Distilasi Vol 7, No 1 (2022): Jurnal Distilasi
Publisher : Universitas Muhammadiyah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jd.v7i1.4466

Abstract

Terbatasnya sumber energi fosil menyebabkan perlunya pengembangan energi alternatif yang murah dan bersifat kontinyu serta dapat diperbaharui. Salah satu bahan baku yang dapat dijadikan sumber energi alternatif yaitu ampas teh dan tempurung kelapa. Pada penelitian ini dilakukan rancang bangun alat pencetak biobriket dengan sistem pneumatik yang menggunakan udara bertekanan sebesar 7 bar dari kompresor dengan 2 lubang cetakan yang berukuran diameter 32 mm dan tinggi 16 mm, menghasilkan gaya diberikan pada piston pneumatik untuk mencetak biobriket sebesar 562,688 N. Gaya dorong silinder atau gaya yang diberikan untuk mendorong silinder sehingga silinder bergerak maju sebesar 48,7714 kgf sedangkan gaya tarikan silinder sehingga silinder bergerak mundur sebesar 5,9059 kgf dengan kecepatan pergerakan maju mundur silinder yaitu 0,0561 m/s. Diameter silinder pneumatik yang di 32 mm dengan double acting cylinder karena diperlukan gerakan maju mundur. Untuk menggerakaan silinder pneumatik tersebut dibutuhkan udara sebesar 3,5596 liter/menit dengan energi atau daya kompresor yang dibutuhkan sebesar 71,9 watt. Pembuatan biobriket campuran ampas teh tempurung kelapa menjadi biobriket dilakukan melalui proses karbonisasi dengan variabel tetap temperatur karbonisasi 400°C dan variabel tidak tetap yaitu waktu karbonisasi 40, 50, 60, 70 dan 80 menit. Dari hasil penelitian, nilai kalor tertinggi dan telah memenuhi standar SNI 01-6235-2000 pada waktu karbonisasi 80 menit sebesar 5673,2129 cal/gr sedangkan kadar air yang telah memenuhi standar SNI 01-6235-2000 sebesar 6,87% dengan waktu karbonisasi yang sama.
Co-Authors ., Erlinawati ., Fatria Alvino, Raudi Arizal Aswan Effendy, Sahrul Effendy. A., Sahrul Febriana, Ida Irawan Rusnadi Jaya, Julian Indra Mahardhika, Lintang Putri Mahendra, Evando Manggala, Agus Naim, Barokallah Muhammad Pratama, Wahyudi Pratiwi S, Anggun Rahayu, Atika Ramadhana. S, Safira Eva Ridwan, K.A Safitri, Widi Sastama, Nanda Shaskia, Bekka Alta Situmeang, Ricky Samuel Sumarna, Herlin Yohandri Bow Zikri, Ahmad