Perancangan Bilah Tipe Inverse Taper pada Turbin Angin Berdasarkan Kondisi Angin di Pekanbaru

The increasing consumption of fossil fuels as energy source of the world cause a decrease in a number of fossil fuels. Wind energy as one of renewable energy resource has a great potential to solve the problem of dependency on fossil fuels, especially in Pekanbaru, Indonesia. Pekanbaru wind speed condition which is considered relatively low can be harnessed efficiently by designing blades which suits wind characteristics in Pekanbaru. Blades are designed using aerodynamic equations and software assistance such as Microsoft Excel, Qblade, and Autodesk Inventor. As a result, the blades had a solid structure, easily in manufacturing and affordable which can generate mechanical power at low wind speeds with a radius 1,1 m and hub 0,2 m and the chord length at the base of the blade 0,13 m and at the tip 0,26 with twist angle at the base of the blade 20,4 and at the tip 5,6 . The result of this research is to show that the inverse taper blade design is applicable in low wind speed conditions in order to produce an affordable, compact, and efficient wind turbine appropriate for wind characteristic in Pekanbaru

Unjuk Kerja Sistem Pendingin Adsorpsi dengan Pasangan Karbon Aktif-Metanol sebagai Adsorben-Adsorbat

The air conditioning system that we used now may contribute to the effects of global warming and high energy consumption. One solution is to use the adsorption cooling system. Adsorption refrigeration system using activated carbon as adsorbent and methanol as adsorbate aims to replace the existing cooling system today. Targets to be achieved in this research is to analyze the adsorption cooling system that can replace vapor compression system that uses a refrigerant that can damage the ozone layer, with vartiation of desorption time and the mass flow rate of water in the evaporator to see its effect on the value of the COP on the system. Adsorbate or refrigerant used in the cooling system is methanol and adsorbent used in adsorption cooling system is activated carbon. The method used in this study is experiment. Experiment method conducted to determine the effect of desorption time variations and variations in the mass flow rate of water in the evaporator to the value of the COP. The highest COP is the variation of water mass flow rate 0,016 kg / s that is 0,099

Perancangan Evaporator Jenis Tube In Tube Heat Exchanger pada Sistem Adsorpsi Kapasitas 5000 BTU/h dengan Pasangan Karbon Aktif-Metanol sebagai Adsorben-Adsorbat

Global warming and high electrical energy consumption issues have been attention all human in the world. Among various technologies especially refrigeration that being developed to prevent those problem. The refrigeration vapor compression cycle, which impaction on the ozone layer and potential damage of global warming because contains HCFC and CFC and Beside that, the highly electrical energy consumption might be happen. In this research proposed a designing and manufacturing of adsorption cooling system with a double bed adsorbed with capacity 5000 Btu/h. The methanol was used as adsorption and activated carbon as adsorbent, which have characteristic zero Ozone Depletion Potential (ODP) and zero Global Warming Potential (GWP) that was expected to be able to decrease damage to the ozone layer and minimize the electrical energy consumption. The method used in this research was the design. The adsorption cooling system contained two adsorbed in a U-tube and circular plate fin with tube from copper and circular plate fin structure from aluminum which a distance fins of 5 mm. An evaporator and a condenser (tube in tube of heat exchanger) with a tube from copper with total heat transfer area was 0.457 m² for evaporator, with desorption/ adsorption phase time was 20 minutes

Rancang Bangun Sistem Pendingin Adsorpsi dengan Pasangan Karbon Aktif-Metanol sebagai Adsorben -Adsorbat

The air conditioning system is used during nowdays is vapor compression system that uses high energy and refrigerant that can damage the ozone layer and global warming increasing. Adsorption cooling system with activated carbon as adsorbent and methanol as adsorbate is expected to replace the vapor compression system that utilizes a high energy, using refrigerants that could potentially damage the ozone layer and the increase of global warming. This study aims to determine the value of COP adsorption cooling system was designed and fabricated. The method used in this research is the design. Method engineering is done for the design, manufacture, and testing of adsorption refrigeration using activated carbon-methanol pair as adsorbent-adsorbate. Based on test data obtained, the lowest temperature of the water coming out of the evaporator is 21.8 °C with the highest temperature change was 2.9 °C and the average water temperature change is 2.31 oC. COP values of adsorption cooling system was designed and fabricated at 0.0439

Unjuk Kerja Turbin Angin Sumbu Horizontal Berdiaemeter 2,6 Meter di Gedung C Fakultas Teknik Universitas Riau

Electrical energy needs are increasing and limited fossil energy triggers a rapid development in renewable energy. One of the renewable energy resources is wind turbines. The kinetic energy of the wind can be converted into electrical energy using wind turbines. The purpose of this study is to figure out the performance of horizontal axis wind turbines with 5 inverse taper type blades. Wind turbines located at a height of 19 m above the ground. The power output of generator was measured with load conditions. The load was given for this testing is 10 Ohm Resistor. Data collected from the testing were wind speeds, electrical voltages and rotational speeds. From the test achieved maximum of 49,24 Watt when the wind speed of 8,3 m/s. Wind turbine generator starts generate electrical power at a wind speed of 2 m/s. The maximum achievement of power coefficient of 0,0369 at TSR 0.721