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All Journal Seminar Nasional Teknik Kimia Kejuangan Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Jurnal Ilmu Fisika Prosiding SNAST
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Studi Eksperimen Karakteristik Shell-And-Tube Heat Exchanger Dengan Variasi Jenis Baffle Dan Jarak Antar Baffle Ariwibowo, Teguh Hady; Permatasari, Prima Dewi; Ardhiyangga, Novan; Triyono, Sugit
Jurnal Ilmu Fisika Vol 8, No 2 (2016): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2135.355 KB) | DOI: 10.25077/jif.8.2.87-97.2016

Abstract

Shell-and-Tube Heat Exchanger merupakan jenis penukar kalor yang banyak digunakan di pembangkit dan pengolahan minyak. Namun, peningkatan performa penukar kalor ini perlu dilakukan dengan cermat karena alirannya yang kompleks didalam shell. Penelitian ini mengkaji peningkatan performa dalam bentuk koefisien perpindahan panas total dan efektivitas dengan melakukan variasi jenis baffle (single segmental dan triple segmental) dan baffle spacing (5 cm dan 10 cm) menggunakan pendekatan eksperimen dan numerik. Penukar kalor diuji pada laju massa 0,033; 0,066; 0,099; 0,133; dan 0,166 kg/s. Pada variasi jenis baffle, hasil eksperimen menunjukkan single segmental menghasilkan koefisien perpindahan panas total dan efektivitas yang lebih baik dari pada triple segmental dengan nilai koefisien perpindahan panas total maksimal 301 W/m2.K pada 0,166 kg/s dan efektivitas maksimal 0,5 pada 0,033 kg/s. Sedangkan, pada variasi baffle spacing, hasil eksperimen menunjukkan baffle spacing 5 cm menghasilkan koefisien perpindahan panas maksimal 651 W/m2.K saat laju massa 0,166 kg/s sedangkan baffle spacing ini hanya munjukkan performa yang lebih besar dari baffle spacing 10 cm ketika laju massa 0,133 kg/s. Hasil simulasi menunjukkan turbulensi aliran yang besar pada sisi shell mengakibatkan distribusi temperatur merata sehingga mempengaruhi koefisien perpindahan panas total. Kata Kunci : Shell-and-Tube Heat Exchanger , baffle spacing, jenis baffle, koefisien perpindahan panas total, efektivitas, CFD. 
Monitoring Renewable Energy Dengan Konsep Mini SCADA Menggunakan IoT Wahyu Pratama , Muhammad Syafii ; Tridianto, Erik; Permatasari, Prima Dewi
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

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Abstract

The supply of electricity for the people of Indonesia is still dependent on PLN. PLN as a company that provides electrical energy often experiences problems that result in rotating blackouts due to peak load and theft which impact on consumers. In this research renewable energy monitoring has been designed using the mini scada concept which is integrated with IoT. The Miniscada concept has the advantage of being able to monitor the amount of electricity generated by renewable energy online, realtime and together wirelessly. By using the SCADA concept which has the function ckient and server. Client as a transmitter is used as a place to read data from the sensor before it is sent to the server. The server as a receiver is used as a place to store data sent by the transmitter and can be monitored online and in real time. The server receives all information on the amount of electricity emitted through the transmitter using a 2.4Ghz frequency radio and uploads the amount of electricity from the server to the cloud platform Blynk application. By utilizing IoT technology that makes it easy to monitor data in the form of voltage and current from solar panels, wind turbines and PLN with IoT via a smartphone. So that the data obtained in the form of AC voltage with 0.9% error DC voltage from Solar Panels with error 1.89% AC current from incandescent lamps 25 watts with error 0.7% DC current from batteries with an error of 3%.
Electric Load Controller Untuk Pembangkit Listrik Tenaga Mikro Hidro Ardianto , Mukhlas; Pratilastiarso, Joke; Permatasari , Prima Dewi
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

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Abstract

In implementation, PLTMH utilizes different head heights so that the potential energy of water is converted into mechanical energy to turn turbines. Then the generator will convert mechanical energy from the turbine shaft rotation into electrical energy. In the operation of PLTMH, fluctuating loads cause unstable frequencies and voltages that can damage electrical equipment and cause overspeed generators when the load is very low. To regulate fluctuating loads on modern PLTMH using ELC (Electric Load Controller). The working principle of the ELC is to control the load which aims to balance the power generated by the generator with the power used by consumers. The results of the simulation conducted by a generator with 30 VA power require an excitation voltage of 52.2 V dc, the dc voltage of the buck converter is capable of producing an output of 52.2 V with a duty cycle value of 0.725%. Changes in consumer loads cause the value of the generator voltage to increase, namely loading from a scale of 11-30 KW with a voltage reading of 220-235 V line-neutral. The decrease in consumer load results in the power transferred to the ballast load being greater, namely alpha angle variation from 0o - 180o. A decrease in consumer load from a scale of 11-30 KW results in the power being transferred to ballast loads from 0 KW - 30 KW. ELC is able to maintain line-neutral voltage on the 220 V set point and has 100% accuracy. The ELC simulation results are able to maintain a 220 V set point voltage with a power capacity generated by a 30 VA generator.
Numerical Study of Shell-And-Tube Heat Exchanger Performance with Various Baffle Spacing Sugit Triyono; Teguh Hady Ariwibowo; Prima Dewi Permatasari
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Heat exchanger  is the instrument used to exchange the heat from one system to another that can be used as a heater or cooler. One of those types is shell-and-tube heat exchanger which is mostly used in many factories. Shell-and-tube heat exchanger consist of shell, which there are many tube inside it with baffles arranged along the shell-side. This study examines the effect of baffle spacing towards shell-and-tube heat exchanger performance which geometry have been specified first. This study used a simulation method developed by Heat Transfer Research Inc. (HTRI) to determine heat exchanger performances. Baffle spacing is set to various values: 30 mm, 60 mm, and 90 mm which one of each conditions also vary the mass flow rate to various number: 0.8333 kg/s, 0.1667 kg/s, and 0.25 kg/s. The simulation will generate outlet temperature of each fluid, overall heat transfer coefficient, and pressure drop. Baffle spacing 30 mm generates pressure drop 0.011 kPa while the increase of mass flow rate from 0.1660 kg/s to 0.250 kg/s also increase the value of pressure drop 0.030 kPa to 0.045 kPa. From those three variation of baffle spacing, baffle spacing 60 mm generates a stable value: 0.003 kPa, 0.007 kPa, and 0.015 kPa that is the optimum condition to gain the good performance of shell-and-tube heat exchanger.
Numerical Study of Shell-And-Tube Heat Exchanger Characteristicsin Laminar Flow with Single Segmental Baffle Novan Ardhiyangga; Teguh Hady Ariwibowo; Prima Dewi Permatasari
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Shell-and-tube heat exchangers (STHEs) are one of the most popular heat exchanger due its flexibility to allow wide range pressure and temperature. The shell-sideperforms very complex flow which result in the difficult of analysis. This paper examines the characteristic of shell-side which obtained by adjusting vary of mass flow rates to gain laminar flow condition. A certain STHE with single segmental baffle used in this analysis that run by the stream analysis method developed by Heat Transfer Research Inc. (HTRI). The result shows that the increase value of mass flow rate will increase the shell-side heat transfer coefficient, pressure drop, and heat exchanger effectiveness. The increase value of mass flow rate from 0.1065 kg/s to 0.1775 kg/s will increase the shell-side heat transfer coefficient about 37.56% where minimum and maximum values are 1557.58 and 2142.76 W/m2.K. The shell-side pressure drop also increase from 0.325 kPa to 0.898 kPa or up to 176.31% increase. The heat exchanger effectiveness increase with the lower number of 7.02% from 0.276 to 0.295. From this experiment, it can be inferred that the increase value of mass flow rate in shell-side will be good to the heat exchanger performance, but the increase value of pressure drop must be in consideration too.
Experimental Study of Heat Transfer Characteristics in The Hair-Pin Heat Exchanger Aulia Arif Shalihuddin; Teguh Hady Ariwibowo; Prima Dewi Permatasari
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

The heat transfer characteristics in the horizontal Hair-pin heat exchanger are investigated experimentally. Heat transfer coefficients were calculated and plotted with the experimental data. The inner and outer diameters of the inner tube are 10.67 and 12.09 mm. The inner tube is made from stainless steel with thickness 0.71 mm and the length of 500 mm with conductivity thernal 14.4 W/m.K. The outer tube is made from PPMA(polymethyl methacrylate) with thickness 2.27 mm and the length of 450 mm. Cold and hot water are used as working fluids in outer tube and inner tube, respectively. Flows in the inner tube and outer tube were counter flow. The mass flow rates were varied of cold water are 0.0167, 0.0194, 0.0222, 0.025 and 0.0278 kg/s. Reynolds number were got between of 1667 and 2776 in laminar flow to turbulent flow. Then, the results data of cold water are heat transfer 139,67 Watt for the lowest flowrate and 348,78 Watt for the highest flowrate. From the experimental results obtained heat transfer characteristics in Hair-pin heat exchanger, can be increased by varied the mass flow rate in cold side
Rancang Bangun Sistem Pengendalian Level Pada Tangki Penyimpanan Menggunakan Degree Of Freedom Analysis Dengan Tunning PID Berdasarkan Metode Cohen-Coon Firmansyah Adi Nugroho; Prima Dewi Permatasari; Hendrik Elvian Gayuh Prasetya
Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Vol 9, No 2 (2020): Edisi Desember 2020
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/setrum.v9i2.9410

Abstract

The storage tank is one of the most important operating units used in the generation process. This operating unit functions as water storage which will later be used as raw material for making steam. To maintain the mass balance system and the energy balance system in the storage tank, a proper control system is needed. One of the variables controlled in this operating unit is implementing a level control system. In a process control system, key knowledge is needed, namely determining the process variable (PV), manipulated variable (MV), and disturbance variable (DV). If it is wrong in determining the three types of variables, then the output from the control system that we provide is not by the value we want (setpoint). Analysis of degrees of freedom (DOF) is used to determine the number of manipulated variables in the storage tank operation unit. To determine the number of variable numbers and the number of equation numbers can be used by looking at the mathematical equation model of the storage unit operation. Meanwhile, to determine the number of variables used in the above equation is to choose the type of variable that affects the process if the variable is changed. PID tunning needs to be done to determine the best proportional, derivative, and integral constant values, which later the output we want is the same as the setpoint value. Cohen Coon is a PID tunning method that can tolerate a constant amplitude oscillation state. Cohen-Coon is trying to improve the oscillation method by using the quarter amplitude decay method. The closed-loop response system, in this method, is made so that the response is in the form of a quarter amplitude decay. Quarter amplitude decay is defined as a transient response whose amplitude in the first period has a ratio of one quarter (1/4).
Modular Renewable Energy Dengan Konsep Mini SCADA Prima Dewi Permatasari
Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Vol 8, No 2 (2019): Edisi Desember 2019
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/setrum.v8i2.6539

Abstract

Dalam upaya meningkatkan rasio elektrifikasi nasional perlu dilakukan kerjasama antar pemerintah dan masyarakat untuk meningkatkan peran energi terbarukan. Dengan adanya penggunaan energi terbarukan dan daya listrik dari PLN memungkinkan untuk kolaborasi serta dilakukan manajemen. Sehingga mampu meminimalisir penggunaan listrik dari PLN dan mengoptimalkan listrik dari energi terbarukan. Pada penelitian ini dikembangkan tekhnologi Modular R-EMS. Modular R-EMS merupakan inovasi teknologi yang memungkinkan penggunaan lebih dari satu energi terbarukan. Modular R-EMS memiliki interface yang menampilkan data berupa tegangan, arus, daya, persen battery, biaya pemakaian beban perbulan disertai sistem back up beban ketika PLN tidak beroperasi. Pemasangan sensor dilakukan pada Node MCU dan arduino yang terkoneksi internet. Error yang dihasilkan pada tegangan AC 0.9% tegangan DC 1.89%  arus AC 0.7% arus DC 3%.Penggunaan energi PLN pada beban hingga 100% ketika malam hari. Penggunaan energi terbarukan pada pagi hari 76.58% hingga 100% pada siang hari 78.95% - 100% pada sore hari 19.64% hingga 62.85%. Daya berlebih dari energi terbarukan otomatis mengalir ke PLN
Studi Eksperimen Karakteristik Shell-And-Tube Heat Exchanger Dengan Variasi Jenis Baffle Dan Jarak Antar Baffle Teguh Hady Ariwibowo; Prima Dewi Permatasari; Novan Ardhiyangga; Sugit Triyono
Jurnal Ilmu Fisika (JIF) Vol 8 No 2 (2016): September 2016
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.8.2.87-97.2016

Abstract

Shell-and-Tube Heat Exchanger merupakan jenis penukar kalor yang banyak digunakan di pembangkit dan pengolahan minyak. Namun, peningkatan performa penukar kalor ini perlu dilakukan dengan cermat karena alirannya yang kompleks didalam shell. Penelitian ini mengkaji peningkatan performa dalam bentuk koefisien perpindahan panas total dan efektivitas dengan melakukan variasi jenis baffle (single segmental dan triple segmental) dan baffle spacing (5 cm dan 10 cm) menggunakan pendekatan eksperimen dan numerik. Penukar kalor diuji pada laju massa 0,033; 0,066; 0,099; 0,133; dan 0,166 kg/s. Pada variasi jenis baffle, hasil eksperimen menunjukkan single segmental menghasilkan koefisien perpindahan panas total dan efektivitas yang lebih baik dari pada triple segmental dengan nilai koefisien perpindahan panas total maksimal 301 W/m2.K pada 0,166 kg/s dan efektivitas maksimal 0,5 pada 0,033 kg/s. Sedangkan, pada variasi baffle spacing, hasil eksperimen menunjukkan baffle spacing 5 cm menghasilkan koefisien perpindahan panas maksimal 651 W/m2.K saat laju massa 0,166 kg/s sedangkan baffle spacing ini hanya munjukkan performa yang lebih besar dari baffle spacing 10 cm ketika laju massa 0,133 kg/s. Hasil simulasi menunjukkan turbulensi aliran yang besar pada sisi shell mengakibatkan distribusi temperatur merata sehingga mempengaruhi koefisien perpindahan panas total. Kata Kunci : Shell-and-Tube Heat Exchanger , baffle spacing, jenis baffle, koefisien perpindahan panas total, efektivitas, CFD. 
PENGARUH MODIFIKASI DOVETAIL-CROWN TIP PADA ROTOR TERHADAP PRESSURE RATIO KOMPRESOR AKSIAL MULTISTAGE Ibnu Samsul Kurniawan; Setyo Nugroho; Prima Dewi Permatasari
PROSIDING SNAST Prosiding SNAST 2018
Publisher : IST AKPRIND Yogyakarta

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Abstract

Compressors are one type of turbomachinery to add energy of fluid and move fluid from one location to another. Axial compressor on gas turbine used to compress fluid to get the required pressure increase. Multiple-stage axial compressor have a high level performance, that is 70-80%. Compressor performance is related with energy utilization, the greater the energy loss, the lower the compressor performance. The biggest energy loss is caused by aerodynamic loss, stall phenomenon and tip clearance. Gap between casing and rotor can cause secondary flow, leakage flow and boundary scrapping. These three streams can cause energy losses and affect the pressure ratio produced by the compressor. One way to get better performance with add dovetail-crown tip modification on the rotor, with the aim of reducing energy loss on the tip clearance. Modification of dovetail-crown tip on the rotor that is, the airfoil profile extended 75% of tip clearance compressor, then given a square gap along the chord with a/b ratio of 1:3. The axial compressors that become the testing system have parameters: 0.5 degree reaction, three stage, stagger angle 24 °, NACA 65- (19) -10 blade profile. Based on the results, the addition of a modified tip blade in the form of a dovetail-crown tip can reduce energy losses by presenting an average reduction in energy losses of 11.9%. The results also show that the use of dovetail-crown tip modification can increase the compressor pressure ratio with an average percentage increase of 0.0219%.
Co-Authors Aprilliyanto, Bagas Ardianto , Mukhlas Arrad Ghani Safitra Aulia Arif Shalihuddin Erik Tridianto, Erik Firmansyah Adi Nugroho Hendrik Elvian Gayuh Prasetya, Hendrik Elvian Ibnu Samsul Kurniawan Imam Santoso Joke Pratilastiarso Lohdy Diana Lovyta Putri Adianti Nabila Haninda Az Zahra Nabila Haninda Azzahra Novan Ardhiyangga Novan Ardhiyangga Novan Ardhiyangga, Novan Prasetya, Hendrik Elvian Gayuh Pratilastiarso, Joke Pratilastiarso, Joke Putra, Firdaus Fhudoli Setyo Nugroho Sugit Triyono Sugit Triyono Sugit Triyono, Sugit Teguh Hady Ariwibowo Wahyu Pratama , Muhammad Syafii