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All Journal Journal of Engineering and Technological Sciences Prosiding Seminar Nasional Teknik Mesin Makara Journal of Technology
Rustan Tarakka, Rustan
Department of Mechanical Engineering, Faculty of Engineering, Hasanuddin University, Jalan Perintis Kemerdekaan KM 10, Tamalanrea, Makassar 90245
Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Experimental Study of an SWH System with V-Shaped Plate Jalaluddin, Jalaluddin; Arif, Effendy; Tarakka, Rustan
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (422.813 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.2.7

Abstract

Solar energy is known as an environmentally friendly energy source with a wide range of applications. This energy can be utilized in various applications such as domestic and industrial water heating using solar water heating (SWH) systems. The thermal performance of an SWH system using a V-shaped absorber plate is presented in this study. Two SWH systems with different absorber plates, i.e. a flat-plate and a V-shaped plate, have been investigated experimentally. First, the absorptivity of the absorber plates was calculated analytically. The optimum V-shaped configuration with angle at β = 21° (V-shaped dimensions t = 4 cm and l = 4 cm) was determined from various V-shaped plate absorbers based on their absorptivity and applied in the experimental study. Two SWH systems were installed and tested at a low flowrate of 0.5 L/min and at a high flowrate of 2 L/min. The results showed that the SWH system with V-shaped plate absorber had a 3.6-4.4% better performance compared with that of the system with flat-plate absorber.
Karakteristik Koefisien Tahanan Aliran Melintasi Tiga Silinder Persegi Tersusun Tandem Konfigurasi Seri Dan Paralel Salam, Nasaruddin; Tarakka, Rustan; Jalaluddin, Jalaluddin; Setiawan, Muh.; Machfud, Andi
Seminar Nasional Teknik Mesin 2019: Prosiding Seminar Nasional Teknik Mesin 2019
Publisher : Politeknik Negeri Jakarta

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Abstract

Tujuan penelitian ini, adalah untuk menentukan karakteristik koefisien tahanan aliran fluida melintasi tiga silinder persegi tersusun tandem konfigurasi seri dan paralel (benda uji), dan menentukan nilai koefisien tahanan yang optimum melintasi benda uji tersebut. Dalam mencapai tujuan tersebut, maka metode penelitian berupa eksperimental dilakukan pada wind tunnel, untuk mengukur gaya tahanan aliran fluida. Pengukuran gaya tahanan aliran dilakukan dengan forces balance measurement. Benda uji silinder persegi 3 buah dengan ukuran panjang sisi-sisi yang sama 5 cm, dan menggunakan material acrylic dengan ketebalan 2 mm. Ketiga silinder tersebut disusun dalam konfigurasi seri dan paralel. Selanjutnya, masing-masing konfigurasi diberikan 2 model perlakuan jarak, yaitu model I jarak selinder 1 dengan silinder 2 (M) berubah sedangkan jarak silinder 2 dengan silinder 3 (N) tetap 6 cm dan model II M dan N berubah dengan jarak yang sama, kemudian diberikan perlakuan 7 tingkat kecepatan yang sama dari 8 m/s sampai dengan 20 m/s. Penelitian berlangsung pada bilangan Reynolds (Re) dari 9.395 sampai dengan 62.634, atau aliran laminar untuk aliran eksternal. Hasil eksperimen menunjukkan karakteristik koefisien tahanan (Cd) pada konfigurasi seri meningkat bila jarak tiga silinder persegi tersusun tandem diperbesar, sedangkan pada konfigurasi parallel nilai Cd menurun bila jarak diperbesar. Nilai Cd yang diperoleh pada masing-masing model konfigurasi seri dan parallel lebih kecil dibandingkan dengan nilai Cd silinder persegi tunggal.
Modification of Flow Structure Over a Van Model By Suction Flow Control to Reduce Aerodynamics Drag Harinaldi, Harinaldi; Budiarso, Budiarso; Warjito, Warjito; Kosasih, Engkos Achmad; Tarakka, Rustan; Simanungkalit, Sabar Pangihutan; Lay Teryanto, I Gusti Made Fredy
Makara Journal of Technology Vol. 16, No. 1
Publisher : UI Scholars Hub

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Abstract

Automobile aerodynamic studies are typically undertaken to improve safety and increase fuel efficiency as well as to find new innovation in automobile technology to deal with the problem of energy crisis and global warming. Some car companies have the objective to develop control solutions that enable to reduce the aerodynamic drag of vehicle and significant modification progress is still possible by reducing the mass, rolling friction or aerodynamic drag. Some flow control method provides the possibility to modify the flow separation to reduce the development of the swirling structures around the vehicle. In this study, a family van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed body). This model is equipped with a suction on the rear side to comprehensively examine the pressure field modifications that occur. The investigation combines computational and experimental work. Computational approach used a commercial software with standard kepsilon flow turbulence model, and the objectives was to determine the characteristics of the flow field and aerodynamic drag reduction that occurred in the test model. Experimental approach used load cell in order to validate the aerodynamic drag reduction obtained by computational approach. The results show that the application of a suction in the rear part of the van model give the effect of reducing the wake and the vortex formation. Futhermore, aerodynamic drag reduction close to 13.86% for the computational approach and 16.32% for the experimental have been obtained.
Co-Authors Budiarso Budiarso, Budiarso Effendy Arif Engkos Achmad Kosasih Engkos Kosasih Harinaldi . I Gusti Made Teryanto, I Gusti Made Jalaluddin Jalaluddin Lay Teryanto, I Gusti Made Fredy Machfud, Andi Nasaruddin Salam, Nasaruddin Sabar Pangihutan Simanungkalit Sabar Simanungkalit, Sabar Setiawan, Muh. Warjito Warjito, Warjito