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All Journal Rotasi FLYWHEEL : Jurnal Teknik Mesin Untirta
Wahyu Nur Fadilah
Department Of Mechanical And Energy Engineering, Politeknik Elektronika Negeri Surabaya, Kampus PENS, Jl. Raya ITS Sukolilo, Surabaya, Indonesia
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Numerical Analysis of the Effect of Serrated Fin to the Heat Transfer in the Condenser Lohdy Diana; Febrian Kusumawardani; Wahyu Nur Fadilah; Muhammad Nabiel Ariansyah; Muhammad Farid Irfianto
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume 7, Issue 2, October 2021
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v0i0.12034

Abstract

Condenser is one of the most important components in the power generation industry, which serves to condense the output steam from low-pressure turbine for boiler feed water. Several ways can be used to improve the performance of the condenser, one way is to add a serrated fin on the outer tube to lower the temperature of the outlet. A serrated fin that is used has 0° and 30 segments per period, which is installed on the tube with the diameter of the outer of 0.03175 m. This research was carried out by using the numerical method of CFD 2D to compare the performance of the heat transfer on the tube without and with a serrated fin on the variation speed of 7 m/s and 9 m/s. By inputting the parameters of the inlet of 350.15 °K, the resulting value of the outlet serrated fin tube temperature which is lower than the annular tube (tube without the serrated fin). On the simulation of the serrated fin tube with an inlet velocity of 7 m/s resulting outlet temperature of 343.2 °K, lower than in the simulation on the annular tube which produces the outlet temperature of 344.53 °K.
Performance Analysis of Working Fluids on Organic Ranking Cycle Using Waste Heat from Flue Gas Wahyu Nur Fadilah; Kartika Meylia Putri; Joke Pratilastiarso
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.1-7

Abstract

The increasing in electricity demand was inversely proportional to the supply of fossil fuels. It required various parties to find innovations to produce more electrical energy without increasing the use of fossil fuels. Organic Rankine Cycle (ORC) was one of the ways to generate electricity with a low heat source and it was affected by the type of refrigerant used as a working fluid. Therefore, this research was conducted to find a working fluid that produced good thermal efficiency and power for the ORC system by utilizing the flue gas from the steam power plant. Simulations were carried out using CoolProp software to determine the properties of the working fluid to be used and Cycle Tempo software to simulate the ORC system. This study used variations of working fluid R134a, R404A, R407C, R410A, and R507. In addition, flowrate variations of 100 kg/s, 150 kg/s, 200 kg/s, 250 kg/s, and 300 kg/s were also used. From this research, the highest thermal efficiency occurred at a flowrate of 300 kg/s using a working fluid R407C, it was 36.19%. The largest net power was also obtained at a flow rate of 300 kg/s using the working fluid R407C, it was 26980.9 kW.
Studi Numerik Pengaruh Geometri Dasar Laut Berbentuk Convex Terhadap Performa Hidrodinamis Oscillating Water Column (OWC) pada Gelombang Pendek Fadilah, Wahyu Nur; Junianto, Sony; Arini, Nu Rhahida; Pratilastiarso, Joke
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.53-59

Abstract

Lautan yang luas menyimpan potensi energi yang besar dalam gelombang laut, menjadi solusi potensial terhadap krisis bahan bakar fosil. Wave Energy Converters (WECs) memegang peranan penting dalam mengoptimalkan potensi ini, dengan Oscillating Water Column (OWC) menjadi perangkat yang paling menjanjikan dan memiliki konstruksi yang sederhana. Penelitian ini mengeksplorasi kompleksitas hidrodinamis OWC, dengan fokus pada pengaruh profil dasar berbentuk convex terhadap efisiensi penangkapan energi, terutama dalam menghadapi gelombang laut yang tidak teratur dan alami. Simulasi numerik dua dimensi (2D) digunakan untuk menganalisis performa hidrodinamis OWC pada frekuensi rendah atau gelombang pendek. Keunikan penelitian ini terletak pada variasi lebar radius convex, dengan nilai yang diuji adalah 1; 1.5; 2; 2.5; 3; dan 3.5 meter. Analisa numerik menunjukkan terdapat penurunan performa hidrodinamis yang cukup signifikan ketika lebar radius bernilai lebih dari 2.5 meter. Hasil studi ini merekomendasikan bahwa untuk mendapatkan performa hidrodinamis yang optimal dan lebih baik dibandingkan dengan profil dasar berbentuk datar, lebar radius convex sebaiknya tidak bernilai lebih dari 75% dari kedalaman air.
Co-Authors Arini, Nu Rhahida Febrian Kusumawardani Joke Pratilastiarso Kartika Meylia Putri Lohdy Diana Muhammad Farid Irfianto Muhammad Nabiel Ariansyah Pratilastiarso, Joke Sony Junianto