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All Journal EMITTER International Journal of Engineering Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Prosiding Seminar Nasional Sains dan Teknologi Terapan Infotekmesin Journal of Applied Civil Engineering and Infrastructure Technology (JACEIT) Journal of Mechanical Engineering, Science, and Innovation
Diana, Lohdy
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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STUDI NUMERIK PENGARUH OBSTACLE PRISMA SEGITIGA SUDUT TEKUK 40° TERHADAP PERPINDAHAN PANAS PADA PEMANAS UDARA SURYA BERBENTUK TRAPEZOIDAL Dewi, Naili Husna; Diana, Lohdy; Safitra, Arrad Ghani
Prosiding Seminar Nasional Sains dan Teknologi Terapan Inovasi Teknologi Infrastruktur Berwawasan Lingkungan
Publisher : Institut Teknologi Adhi Tama Surabaya

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

Abstract

Matahari merupakan sumber energi terbarukan, Energi tersebut dapat digunakan sebagai pemanas udara. Prinsip kerja pemanas udara surya adalah energi panas matahari ditransmisikan  oleh kaca kemudian diserap oleh plat penyerap. Panas tersebut digunakan untuk memanaskan udara yang dialirkan ke dalam saluran plat penyerap melalui bantuan induced fan. Pada penelitian ini, membahas tentang pengaruh obstacle berbentuk prisma segitiga terhadap perpindahan panas dan penurunan tekanan di dalam saluran pemanas udara yang berbentuk trapezoidal. Obstacle yang digunakan berbentuk prisma segitiga dengan sudut tekuk 40° disusun secara segaris atau inline dengan memvariasikan parameter S/H= 0.7; 1; 1.3. Penelitian dilakukan secara simulasi numerik dengan menggunakan software CFD komersial. Simulasi dilakukan secara tiga dimensi menggunakan model RNG k-? viscous model. Kriteria konvergen 10-6 untuk residual kecepatan, momentum serta energi.  Kondisi batas yang diberikan antara lain kecepatan sisi masukan 2.62m/s, sepanjang dinding saluran diberikan heat fluxs 620W/m2, dinding bawah terisolasi sempurna serat sisi keluaran merupakan outflow. Hasil simulasi menunjukan obstacle dengan sudut tekuk 40° dengan parameter S/H=1.3 memiliki nilai kenaikan temperatur sebesar 17.73K, energi yang berguna 132.12watt, penurunan tekanan terendah sebesar 31.59Pa dan memiliki effectiveness tertinggi sebesar 0.78 sehingga dapat dikatakan paling optimum
Numerical study the effect of inlet and outlet ventilation configurations for passive cooling air conditioning system Safitra, Arrad Ghani; Diana, Lohdy; Pratilastiarso, Joke; Hidayat, Nur
Journal of Mechanical Engineering, Science, and Innovation Vol 4, No 2 (2024): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2024.v4i2.6659

Abstract

The application of Green Energy Technology through Passive Cooling System is the right solution. It aims to achieve energy savings and reduce CO2 emissions. This study focuses on the simulation of room conditions using the computational fluid method. The simulation aims to determine the effect of inlet and outlet configuration against the air condition in the room. The results presented in this simulation are the distribution of air temperature, air humidity, and air velocity. The variations used in the simulation are the air inlet and outlet positions, there are three configurations of air inlet and outlet positions. Variation 1: two inlets – one outlet, Variation 2: two inlets – two outlets, Variation 3: four inlets – three outlets. The results of the study show Variation 3 has the best design if cooling or heating equipment wants to be added, for example passive cooling in summer and a heater for cold weather. On other hand, Variation 1 is the most effective in maintaining the stability of humidity distribution and air velocity within the room. This configuration successfully creates optimal ventilation by generating efficient natural convection without significant fluctuations, achieved using two inlets and one active outlet
Modifikasi Sudut Masuk Impeller Pompa Sentrifugal Untuk Mengurangi Efek Kavitasi Arini, Nu Rhahida; Ramadhani, Desy; Diana, Lohdy; Reivanda, Reihan Rizky
Journal of Applied Civil Engineering and Infrastructure Technology Vol 6 No 1 (2025): Agustus 2025
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jaceit.v6i1.984

Abstract

A centrifugal pump utilizes pressure energy, which is generated by the kinetic energy of involute impeller rotation. A common issue in pump operation is cavitation, a physical phenomenon that occurs when the static pressure of the fluid drops below its saturation pressure, causing the fluid to boil. This phenomenon affects the pump, leading to problems such as shockwaves and erosion, which must be minimized. This research aimed to investigate the influence of pump impeller modifications in reducing the cavitation effect using the computational fluid dynamics (CFD) method. The modifications focused on adjusting the inlet and outlet angles of the pump impeller. A 3D CFD model was developed using OpenFOAM, a CFD software tool, and the cavitation number (Ca) was used as the primary parameter to measure cavitation levels. Additionally, Ca was compared to a reference cavitation number, calculated based on the saturated pressure, while cavitation points at the impeller inlet and outlet were visualized using Paraview software. The results showed that a pump impeller with a blade inlet angle (β₁) of 21,69° resulted in 39.157 cavitation points, whereas modifying β₁ to 38,66° reduced the cavitation points to 32.778, thus decreasing the cavitation points by 6.379. This confirmed that modifying β₁ significantly reduces the cavitation effect.
The Experimental Study of the Lens Wind Turbine Performance with Vortex Generator Diana, Lohdy; Pratilastiarso, Joke; Safitra, Arrad Ghani; Arini, Nu Rhahida; Saputra, Firman Yunan; Syahputra, Ar Rayyan Ikhsan; Putra, Firdaus Fhudoli
invotek Vol 24 No 3 (2024): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v24i3.1237

Abstract

Wind energy potential is available in several regions in Indonesia with wind ranges reaching 5 m/s. Wind turbine research continues to develop to produce optimal power. The aim of this research is to determine the performance of wind turbines equipped with diffusers or lens that put triangle fin vortex generator on lens’s surface. The turbine blade used Clark-Y that has a winglet angle of 45-degrees. There are three variations of lens wind turbine that were tested: without vortex generator, z/h=4.5, z/h=2.5, z/h=0.5. The research was carried out experimentally with fifth wind velocity 3 m/s, 3.5 m/s, 4 m/s, 4.5 m/s, and 5 m/s. The results analyzed to determine turbine performance are turbine rotation, the power produced due to wind direction. Based on the results of the experiments that have been carried out, the results were obtained a straight comparison between TSR and wind turbine rotation (rpm), and straight comparison between Cp and TRS. The Cp is largest in a lens wind turbine with a vortex generator z/h=0.5, which is 0.59 and has the highest power output of 473 watt.
Impact of Embedded Pipe Configuration in Phase Change Material on Photovoltaic Cooling Diana, Lohdy; Aziz, Abdul; Safitra, Arrad Ghani; Pratilastiarso, Joke; Kusumawati, Eny
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.8177

Abstract

The photovoltaic as a solar power plant is increasingly widespread as renewable energy. However, high photovoltaic surface temperatures can reduce performance in generating electricity. Based on these problems, a photovoltaic cooling system is needed. This research aims to produce effective photovoltaic cooling by planting pipes that carry cold fluid embedded in Phase Change Material. The experimental research used solar simulator, there are three variations of pipe configuration, including: parallel, serpentine, and circular. The photovoltaic used in this research has a specification of 50WP. This study examines the effect of various cooling pipe configurations on thermal performance, output power, and the reduction of photovoltaic temperature. The results show the serpentine pipe configuration exhibits the highest thermal efficiency initially but declines drastically over time, while the circular pipe design demonstrates the best long-term stability and efficiency. Specifically, the circular pipe variation effectively reduces the photovoltaic surface temperature, maintaining the lowest temperature of around 42°C at the 80th minute, compared to higher peak temperatures in the unmodified variation 67°C, serpentine 50°C, and parallel 45°C. Overall, the circular pipe design is identified as the most effective cooling method for maintaining low surface temperatures and ensuring stable performance in photovoltaic panels.
The Experimental Study of the Effect of Cooling Pad Surface Shape on Passive Cooling Performance Diana, Lohdy; Safitra, Arrad Ghani; Ariwibowo, Teguh Hady; Riyantoni, Ricko Guntur; Islam, Saiful; Prasetyo, Muhammad Fandi Setiawan Cahyono
invotek Vol 24 No 1 (2024): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v24i1.1173

Abstract

Climate change causes the air conditions inside buildings to increase in temperature. This causes the demand for cooling processes to increase every year. The use of cooling equipment currently requires quite a lot of electricity costs and produces CO2 emissions. The experimental study of the effect of cooling pad surface shape on passive cooling performance to produce a cooling device that is economical and environmentally friendly. The variations of the cooling pad surface were sinusoidal wave and triangular wave. The method was experiments carried out in the laboratory to control environmental conditions. The test results showed that the sinusoidal wave variation had a temperature drop of 1.1 °C lower than the triangular wave. The sinusoidal wave variation has 5% lower relative air humidity than triangular wave variation but air humidity for both variations had increased. Meanwhile, the use of silica sand could not reduce air humidity, it was because of the sum of sand that was used.
Studi Eksperimen Pengaruh Bentuk Saluran Pada Corrugated Collector Terhadap Performa Pengering Tomat Tenaga Surya Safitra, Arrad Ghani; Diana, Lohdy; Gamar, Farida; Astin, Novita; Kusuma, Diki Candra; Sasongko, Rio Bagus
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.3094

Abstract

Solar Air Heaters (SAHs) are a strategic solution to mitigate post-harvest losses of horticultural commodities caused by inefficient conventional drying. This study aims to analyze the effect of serpentine absorber channel geometries integrated with Fresnel lenses on collector thermal performance and drying effectiveness. The experimental method involved testing three absorber channel cross-sections—triangular, rectangular, and trapezoidal—under outdoor conditions. The results indicate that the trapezoidal design offers superior thermal performance compared to other variations. The trapezoidal collector produced a maximum outlet air temperature of 88.5°C, a useful heat gain of 1,744.49 Watts, and a thermal efficiency of 50%. Application to tomato drying demonstrated that the system reduced drying time by half compared to open sun drying and significantly lowered product moisture content. This study concludes that integrating a trapezoidal absorber with a Fresnel lens effectively enhances the performance of active solar drying systems.
Thermal Analysis of Solar Air Heater with Ventilator Turbine and Fins Safitra, Arrad Ghani; Diana, Lohdy; Agil, Denny Muhammad; Fareza, Julfan Hafiz; Arini, Nu Rhahida
EMITTER International Journal of Engineering Technology Vol 8 No 2 (2020)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24003/emitter.v8i2.584

Abstract

Solar air heater (SAH) is a renewable energy application for the drying process. SAH has a challenge to produce high performance under uncertain weather. The performance of SAH can be enhanced by providing the absorber plate by adding the fins. This study aims to evaluate the thermal performance of SAH with rectangular fins SAH at low air velocity. This study compares the performance of SAH without fins and SAH with rectangular fins. Two variations of a tilt angle of SAH are 0° and 30° which are observed in this study. The SAH uses a ventilator turbine to suck air into the collector box. The air velocity is 0.01 m/s. The method is experimental. The SAH is tested under real condition from 9 a.m. to 4 p.m. The measurement tools consist of a pyranometer, an anemometer, a temperature sensor in the inlet section, 3 sensors in the absorber plate, a sensor in the outlet section, 6 temperature sensors in the drying cabinet. The result showed the thermal efficiency of SAH with rectangular fins is 29.67 % higher than SAH without fins at 0˚ tilt of angle at noon. The thermal efficiency of SAH with rectangular fins is 25.26 % higher than that of without fins at 30˚ tilt of angle at noon.
Co-Authors Abdul Aziz Agil, Denny Muhammad Arini, Nu Rhahida Arrad Ghani Safitra Astin, Novita Dewi, Naili Husna Eny Kusumawati Fareza, Julfan Hafiz Gamar, Farida Islam, Saiful Kusuma, Diki Candra Nur Hidayat Prasetyo, Muhammad Fandi Setiawan Cahyono Pratilastiarso, Joke Putra, Firdaus Fhudoli Ramadhani, Desy Reivanda, Reihan Rizky Riyantoni, Ricko Guntur Saputra, Firman Yunan Sasongko, Rio Bagus Syahputra, Ar Rayyan Ikhsan Teguh Hady Ariwibowo