Sukmaji Indro Cahyono et al., International Journal of Emerging Trends in Engineering Research, 8(6), June 2020, 2617 - 2623 2617 ABSTRACT The wind turbine, a high potential renewable energy that available install directly in the location of energy demand.it can reduce energy loss due to the transmission. Installation of the wind turbine integrated with a building has a significant problem due to the efficiency and noise. In the urban area, the high building and particular roof design can be amplified the wind speed. In present research aim to investigate Savonius wind turbine with addition slotted blade, that suitable integrated with the doom roof type building. The research was conducted by an experiment method in an open type wind tunnel, and the best variable of the experiment becomes the input of Computational Fluid Dynamic (CFD) simulation, the Savonius wind turbine integrated on the doom roof type. The experimental variables are slotted angle blade 5°, 10°, and 15° degree, and wind speeds are arranged 3 m/s to 9 m/s. The validation of simulation is observed by comparing with the experimental result. In the simulation, the ratio of the doom geometry is a comparison between diameter to the high of the doom. The doom ratios is 1.5, and the position installation is on the top of the doom. The result found that the highest power coefficient is achieved to 0.291 and the torque coefficient to 0.776 by the 6m/s of wind speed. The slotted angle blade of 5° obtained as the optimum configuration in a low tip speed ratio. The 1.5 doom roof ratio is considered the highest performance of CFD in both of the top and side installation. This experiment result can become a reference to implemented the installation on the doom roof type such as mosque in urban areas with low wind speed Key words: Doom roof, Power coefficient , Savonius wind turbine, Slotted blade, Tip speed ratio, and Torque coefficient. 1. INTRODUCTION Ecofriendly electricity can be generated by wind energy as alternatives to renewable energy. The wind energy has highly potentially implemented at the location that energy is used. Many research has a design wind turbine to convert wind energy into electric energy. Kragten [1] and Bitar et al. [2] investigated the traditional wind turbine design, a horizontal axis wind turbine have several disadvantages; they are poor efficiency in the low speed of the wind, relative high noise, and required tall towers. The enormous requirement of electrical energy location is urban environments, and commonly, it has many high-rise buildings. However, the wind conditions in urban areas were turbulent, and the relatively low wind speed. Also, the wind speed is always changing, and the direction is not always the same [3]. The wind turbine suitable for integrating with a building in an urban area and have more optimal in low-speed wind turbines. The savonius wind turbine is a vertical axis wind turbine (VAWT) that has low initial speed and low maintenance cost. The Savonius wind turbines integrated with tall buildings are increasingly in demand as micro electric generating applications [4]. Various research of the Savonius wind turbine blade design has been studied to improve rotor efficiency and performance. Ricci et al. [5] investigate some of the advantages of Savonius wind turbines are: able to operate in turbulent and multi-directional wind conditions, especially in urban environments. However, according to Roy et al. [6], The Savonius turbines have a poor efficiency than other types of turbines but work with optimal efficiency at low speed. The characteristic of Savonius wind turbines that the number of savonius blades to achieve the best efficiency at low speed are two compare with three or four blades [7]. Previous research of Savonius turbine power coefficients are achieved in the range of 0.10-0.25. Kacprzak et al. [8] studied about the modifications of the blade in the savonius wind turbine are developed by the researcher to improve rotor efficiency and performance. Research by Alexander and Holownia [9] found the effects of blade ratio, overlap blade, and the spacing distance between the turbine blade by the experiment in the wind tunnel. Savonius wind turbines with an overlap blade can increase the performance by allowing the wind to flow into the gap between the overlapping blade and between the two blades, The Study of the Savonius Wind Turbine Blade Performance Integrated on the Doom Roof Type Building Sukmaji Indro Cahyono 1 *, Nanda Syukron Roziqin 2 , Dominicus Danardono Dwi Prija Tjahjana 1 1 Faculty of Engineering, Universitas Sebelas Maret (UNS), Surakarta 57126, Indonesia. * Corresponding author: sukmaji@ft.uns.ac.id 2 Undergraduate student, Faculty of Engineering, Universitas Sebelas Maret (UNS), Surakarta 57126, Indonesia ISSN 2347 - 3983 Volume 8. No. 6, June 2020 International Journal of Emerging Trends in Engineering Research Available Online at http://www.warse.org/IJETER/static/pdf/file/ijeter65862020.pdf https://doi.org/10.30534/ijeter/2020/65862020