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Rosyida Permatasari, Rosyida
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Penentuan Persamaan Distribusi Temperatur Udara Dalam Ruang Annulus Pada Daerah Sub-Layer Laminar Dengan Metoda Regresi Permatasari, Rosyida; Riyono, Joko
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Determination of Air Temperature Distribution Equation in Annulus Room on LaminarSub Layer Theretorey. Laminar sub-layer is a very thin region near the wall has a laminar character andthe viscous action and heat transfer take place under circumstances like those in laminarflow. ^ Havingobtained a knowledge of the temperature distribution, the heat transfer rate from a heated surface to afluid which isforced over it may be determined. The temperature distribution is obtained by leastsquaremethod. Andthe observation data is closed by exponentialregression equation.
Pengaruh Penambahan Zat Aditif X terhadap Viskositas, Performa Mesin dan Emisi Gas Buang Sepeda Motor Honda CB150R Senoadi, Senoadi; Adi, Supri; Permatasari, Rosyida
MESIN Vol 10, No 1 (2019): Optimization in Renewable-Energy Conversion and Mechanical Design for National
Publisher : Universitas Trisakti

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Abstract

Mechanical contact is the process which can not be avoided in machinery system. The way to diminish thrist conditon which caused by the process is to give engine lubricant into that system. The lubricant resistance over the temperature system is influenced by base stock and its additives where contained of. Lubricant oil additives are chemical compounds that will improve or enhance the lubricant performance of base oil. These additives are carefully designed to ensure the functions in machines system. Engine lubricant that used in this research is MPX 1 SAE 10 W-30 and the additives that used is Engine Additive with brand Lupromax. The aim of this research is to analyze the reaction of increasing the additive EA over to viscosity and machine function of Honda All New CB 150R. In this research, it is found that the fusion with EA 5.25% (1200 ml lubricant with 63 ml additives) could: (1) reduce viscosity to 66.56 mm2/s and 9.9 mm2/s at temperatures of 40°C and 100°C, respectively, (2) enhance the torque and energy to 14.5 kW @9000 rpm and 12.23 Nm @7000 rpm with reducing the rate emision of CO to 0.44% vol, HC to 196 ppm vol, CO2 to 6.5% vol and enhancing the rate of O2 to 10.71%, and (3) reduce fuel consumption to 18.75 ml/km.
Perancangan dan Pemodelan Turbin Darrieus untuk Pembangkit Listrik Tenaga Arus Laut (PLTAL) Prayoga, Wahyu Adi; Permatasari, Rosyida
MESIN Vol 10, No 1 (2019): Optimization in Renewable-Energy Conversion and Mechanical Design for National
Publisher : Universitas Trisakti

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Abstract

Sea current energy is one of the new and renewable energy that is currently being developed to replace fossil energy which is starting to deplate its availability. Sea current energy research continues to be developed. One of the studies that can be developed is modeling laboratory-scale sea currents, so that it is necessary to design a model of Sea Current Power Plants that aims to improve the process of understanding the energy. In this design, a model of Sea Current Power Plant with a capacity of 150 Watt is designed using the Darrieus Turbine. The design results some data such as : diameter of 428 mm for turbine rotor, height of 327 mm for turbine rotor, chord length of 0.04 m for 3 NACA 0018 airfoil blades, and a transmission ratio of 1 : 5 for transmission systems using a straight gear gearbox. In addition, the turbine generated 205.5 rpm rotation at  flow rate of 1.15 m/s with turbine efficiency of 40%.
Pengaruh Perbedaan Tegangan Pemanas terhadap Performa Refrigeran R12, R134a dan MC134 pada Refrigeration Laboratory Unit Senoadi, Senoadi; Aliandi, Arif Akhmad; Permatasari, Rosyida
MESIN Vol 10, No 1 (2019): Optimization in Renewable-Energy Conversion and Mechanical Design for National
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/ms.v10i1.4128

Abstract

Along with technological developments and population growth, the need for air conditioner (AC) is increasing, both those used in industry, offices, buildings, housing, vehicles, and others. In the use of AC, refrigerant is needed. Based on the Montreal agreement, it was agreed to replace refrigerants that are more environmentally friendly. The refrigerant used today is refrigerant with CFC and HCFC compounds. The use of those refrigerants result in ODP and GWP. This study aims to determine the energy efficiency of three refrigerants: R12, R134a, and MC134, by comparing the COP value of a refrigeration laboratory unit machine. Based on the test results, COP of MC134 refrigerant has the highest value compared to R12 and R134a refrigerants. Therefore, it can be concluded that MC134, a hydrocarbon refrigerant, could be considered as a substitute for R12 and R134 refrigerants, eventhough  flammability of the  hydrocarbons at certain temperatures should be considered also.