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All Journal Rotasi Prosiding SNATIF Semesta Teknika JMPM (Jurnal Material dan Proses Manufaktur) Eksergi: Jurnal Teknik Energi Formosa Journal of Science and Technology (FJST)
Thoharudin, Thoharudin
Universitas Muhammadiyah Yogyakarta
Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Journal : Semesta Teknika

 1 
Penjernih Kabut Asap Kebakaran Hutan dengan Media Plasma dan Karbon Aktif Terintegrasi Isnan, Muhammad; Rofiq, Ainur; Hasanudin, Ibnu Awal; Thoharudin, Thoharudin
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

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

Abstract

Smoke haze from forest fires consists of Volatile Organic Compounds (VOC) and particulate matter which has micro size that can cause the respiratory disorders. Therefore, the device to reduce the matters is necessary to prevent the respiratory health including the lung. One of the many methods is using plasma and activated carbon for eliminating the matters from the air that was conducted in this study. Smoke haze was modeled as exhaust gas obtained from rice husk combustion. The velocity of gas in the cleaning device was controlled in various velocities, namely 0.3, 0.9, 1.2 and 1.5 m/s. The calculation of smoke haze particulate matter and VOC was conducted in a simple method by using cutton as filter media to separate the particulate matter and VOC from the gas. This study resulted that the increasing of velocity affected the increasing of particulate matter and VOC filtered on the cutton. The plasma utilisation on the device affected the reduction of particulate matter and VOC filtered on the cutton. The application of both plasma and activated carbon in the device could achieve the best performance of eliminating the particulate matter and VOC indicated by the clean cutton obtained after filtering. The highest efficiency of particulate matter and VOC removal was achieved by applicating both plasma and activated carbon with gas velocity of 1.5 m/s, namely 96.1 %.
Simulasi CFD Aliran Stratified Air-Udara pada Pipa Horisontal Sukamta, Sukamta; Thoharudin, Thoharudin; Nugroho, Dedy Melianto
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212227

Abstract

Two-phase flow can be found in industries, such as petroleum, electricity generation. In geothermal power plants, two-phase flow occurs from a mixture of water and steam which should be avoided in the piping system because it can cause equipment damage in the operating system. Therefore, an operator and engineer need a knowledge of flow patterns, phenomena and characteristics of the two-phase flow. One of the methods to predict the flow pattern is ud\sing the Computational Fluid Dynamic (CFD). This CFD simulation was modeled using Ansys Fluent 15.0 software to determine the changes of Stratified flow characteristics. The model used is Volume of Fluid (VOF). The fluid type is water and air. The variation of superficial water velocity JL of 0.025 m/s - 0.1 m/s while the superficial air velocity (JG) of 0.05 m/s - 1 m/s. The pipe used is an acrylic of 19 mm diameter and length of 1000 mm. The simulation results show that: (1). Stratified flow occurred for the low velocity of the liquid and gas phases. It was shown by the water and air are clearly separated. (2). Flow patterns are not stable, but it can change depending on the superficial velocity of gas and water. (3). The larger of JG causes the wave height because of Bernoulli’s effect so that it will make the stratified wavy or ripple flow pattern. (4). The frequency of stratified-wavy and ripple waves will tend to decrease when the JL increases, while the effect of JG is insignificant. Furthermore, it can be concluded that the speed of gas must be regulated so as not too large to the speed of water.
Investigasi Kapasitas Energi Termal pada Solar Water Heater Berbasis Kalor Laten dengan Variasi Debit Air Nadjib, Muhammad; Caroko, Novi; Thoharudin, Thoharudin; Darmawan, Hanifan
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.18196

Abstract

Material penyimpan kalor pada solar water heater adalah air sebagai kalor sensibel. Kekurangan air adalah densitas energinya rendah. Material lain adalah dari golongan kalor laten (phase change material, PCM) yang memiliki densitas energi tinggi. Unjuk kerja termal SWH tipe aktif dengan tangki horizontal dan memakai PCM jenis paraffin wax terhadap perubahan debit aliran air belum pernah diungkap. Tujuan penelitian ini adalah untuk mendapatkan karakteristik pengaruh perubahan debit air terhadap kapasitas penyimpanan energi termal di tangki. Penelitian menggunakan SWH dengan tangki yang di dalamnya diletakkan kapsul silinder berisi paraffin wax RT55. Termokopel dipasang di sisi air dan PCM. Eksperimen dilakukan secara indoor memakai solar simulator. Debit aliran air yang digunakan adalah 1 lpm, 2 lpm dan 3 lpm. Penelitian ini mendapatkan hasil yaitu kapasitas energi termal untuk debit aliran tersebut masing-masing adalah 10,45 MJ, 10,59 MJ dan 10,71 MJ. Semakin besar debit air maka kapasitas penyimpanan energi termal semakin tinggi.
Co-Authors Agung Santoso, Tito Hadji Aji, Hanung Yudistira Anwar, M. Choirul Arif Setyo Nugroho Ayatullah, Maulana Wahyu Budiyantoro, Cahyo Caroko, Novi Darmawan, Hanifan Hasanudin, Ibnu Awal Irawan, Fabio Dwi Bagus Irawan, Fabio Dwi Bagus Isnan, Muhammad Iswandi Iswandi Martinus Heru Palmiyanto Mubaroq, Fiqih Anas Muhammad Nadjib, Muhammad Nugroho, Dedy Melianto Rofiq, Ainur Santosa, Tito Hadji Agung Sembiring, Suzad Miko Stefanus Unjanto, Stefanus Sukamta Sukamta Sukmana, Rifky Adji Sunardi Sunardi Suyono, Warsito Kabul Wahyudi Wahyudi Wahyudi, Wahyudi Yudha, Fitroh Anugrah Kusuma