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Pasek, Ari D
Mesin
Mechanical Engineering

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KAJI EKSPERIMEN OPTIMASI KOEFISIEN DAYA SKEA JENIS POROS DATAR DENGAN SUDU GABUNGAN SILINDER BERPUTAR DAN ROTOR SAVONIUS Soetanto, Maria F; Suwono, Aryadi; Darmanto, Prihadi S; Pasek, Ari D
Mesin Vol 19, No 2 (2004)
Publisher : Mesin

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Abstract

Horizontal Axis Wind Energy Conversion System (HAWECS) is more efficient than other Wind Energy Conversion Systems at the same condition [2,3]. Rotating cylindrical blade is taken as the substitute alternative to the airfoil blade considering that presence of lift force and its simple manufacturing production. The lift force generated by the rotating cylinder is known as the Magnus Effect [1,7,9]. The savonius rotor in this research is employed to propel the cylinder. This research conducted an experiment to optimize the energy conversion of a HAWECS which its blades consist of the combination of cylinder and savonius rotor. Two kind of blades were used in this experiment, i.e.blade with L/D (ratio of the length and diameter of cylinder) equals to 3 and 4. Three variations of wind velocities were used, i.e. 8.5 m/s, 9.7 m/s, and 10.2 m/s. Experimental results present that the blade with L/D ratio = 4 give more efficient than the L/D = 3, and the increase of power was reached if the wind velocity increases.
SIFAT MAMPU NYALA DAN MASSA OPTIMUM REFRIGERAN CAMPURAN R-290/R-22 SEBAGAI ALTERNATIF PENGGANTI R-22 Pasek, Ari D; Suwono, Aryadi; Nugraha, Novianti; Rosyadi, Usman
Mesin Vol 22, No 2 (2007)
Publisher : Mesin

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The limited application of ozone depleting substance (ODS) such as CFC and HCFC refrigerants has encourage researchers to find a new alternative refrigerant. Hydrocarbon refrigerant such as R-290 (propane) has been widely used because it is environmentally friendly, save energy, and drop-in substitute. However, hydrocarbon refrigerants are flammable and categorized as A3 class refrigerant, so that the application of the refrigerants are limited by safety standard. In this research, an effort to lower the flammability of R-290 has been carried out. Series of flammability test have been done to proof that the flammability of R-290 is reduced by mixing it with R-22. Mixture of R-290/R-22 at molar fraction 0.4/0.6, 0.5/0.5, 0.59/0.41 has Lower Flammability Limit (LFL) above 3.5%, so that it can be classified as A2 class refrigerant. The optimum refrigerant charges of the refrigerant mixtures that give the highest COP have also been investigated. The results show that the optimum refrigerant charge of the mixture is lower than R-22 but higher than pure R-290. The system COP of R-290/R-22 mixture is higher than that of R-22 but lower than R- 290 system.
PENGEMBANGAN METODE SIMULASI SISTEM PENGKONDISIAN UDARA ENERGI SURYA Hermanto, Agus; Suwono, Aryadi; Abdurrachim, Abdurrachim; Pasek, Ari D
Mesin Vol 20, No 2 (2005)
Publisher : Mesin

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In this research, a simulation method has been developed for designing a solar air conditioner and predicting its perfomances. This simulation based on solar irradiation data, solar collector performance data, LiBr-H2O absorption chiller single effect performance data, Phase Change Material (PCM) data as its inputs. Napthalene is used for HTTS and acetic acid is used for TTS. Energy balance, mass balance, and characteristic equations of each component are used in the solar air conditioning simulation. Validation of the developed simulation model was done with experiment data for solar air conditioning system with HTTS and LTTS without auxiliary heater. Generally, the tendency of the simulation and experiment results are similar. The application of HTTS and LTTS make the system can be operated more in 100 minutes.
Co-Authors Abdurrachim Abdurrachim Agus Hermanto Aryadi Suwono Darmanto, Prihadi S Nugraha, Novianti Rosyadi, Usman Soetanto, Maria F