The technical and economic features of a patented V-shape roof guide vane (VRGV) with a solar and wind power generation system mounted on an eco-roof system are presented in this paper. Moreover. this innovative VRGV was investigated on for the purpose of improving the performance of a vertical axis wind turbine (VAWT). which was installed on an eco-roof system to solve the low-effici... https://crowssportes.shop/product-category/wood-stick/