Abstract. The total potential of wind energy in Indonesia reaches 144 GW. This wind energy potential is dominated by small wind speeds ranging from 4-6 m / s and about 113 GW. This is the reason why the development of small-scale wind powerplant is more feasible to be developed in Indonesia. The characteristics of local wind and geographical conditions of Indonesia which is an archipelagic country are fundamental in designing wind power and utilizing of local materials. This study aims to get local fast-growing wood of wind turbines blades in Indonesia, which has the best physical and mechanical properties of wood, and is tested computationally on certain airfoils and shows a uniform distribution of stress. The types of wood are tested in this study were Sengon (Albizia chinensis), Jabon (Antocephalus cadamba), and Balsa (Ochroma Rowlee grandiflorum). The test covers the basic properties of the wood, physical and mechanical properties. The test results showed that Jabon have density 0.34 was the best compared to Sengon (0.24) and balsa (0.18). The best dimensional stability (T/R Ratios) are Jabon (1.97), sengon (2.19) and balsa (2.84), respectively. With the highest density result and the lowest dimensional stability value, mechanical testing of Jabon wood shows the best mechanical properties. The simulation result using Q-Blade software was obtained airfoil NACA 4415 most suitable for local wind characteristics, and got the low value of stress and distribution color uniformly on each wood.
The landfill gas technology has been implemented in some landfill in urban area of Indonesia. Bantargebang integrated waste treatment (TPST Bantargebang) is the first landfill completed with energy recovery facility, landfill gas technology. TPST Bantargebang power plant established in 2010 and supplied electricity to grid. The electrical energy supplied tend to decrease and only reaches 2.4 GWh in 2017. Energy potential is important to evaluated for knowing the performance of TPST Bantargebang power plant. By using Modified Triangular Method, obtained the results that the electricity energy potential equal to 4.5 GWh. The calculation also estimate the emission reduction potential about 4325.88 tCO2/year, and economic potential from sales of electricity about 3.7 billion rupiah.
In Indonesia, the waste to energy conversion technology has been installed and operate in some landfill, such as Bantargebang landfill where applied landfill gas recovery methods. Evaluate the running process is important to optimize the installed facilities and the other potential technology. This paper aims to evaluate the running process technology in Bantargebang landfill compare with the other waste to energy technology so it can be used as a reference for upgrading technology. Evaluation using Multi Criteria Decision Making techninque with observe method Analitycal Hierarcy Process adopt energy (energy content and net electrical output), environment (MSW reduction and GHG emission), and economic (initial cost and operation maintenance cost) as criterions. The results shows that the anaerobic digestion as alternative technology is the best technology with total point 2.71, followed by inceneration pelletization at second rank with total point 2.70, and running process landfill gas recovery at third rank with total point 2.56.
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