Development of a small wind power system with an integrated exhaust air duct in high-rise residential buildings

• The Venturi exhaust air duct cap was proposed to amplify an exhaust air speed.
• The small wind power system was installed with the exhaust air duct.
• The generated output of small wind power system with exhaust air duct cap was improved.

This study explores the application of a small wind power system with an integrated exhaust air duct in super high-rise apartments. This is accomplished by designing and manufacturing the diameter of the exhaust air duct such that it can be connected with the exhaust employed for both the living rooms and bathrooms of the apartments. Additionally, the Venturi exhaust air duct cap is designed to be in the shade to prevent turbulent and counter flows of the blade. The shape of the blade is designed as a double-wing structure. The structure consists of Savonius and Darrieus shapes combined with a horizontal axis for installation on the exhaust air duct.The results from the test-bed tests are obtained after the installation of the designed and manufactured small wind power system with the combined exhaust on the rooftop of a building with 15 floors (53.1 m high, 90 m above sea level). The electricity generated by the designed system is thrice that of a general small-size wind energy system for the average external wind velocities of 0.9 m/s, 1.2 m/s, and 1.3 m/s (maximum wind velocity was 2.3 m/s).The energy generated from the installation of this system on a super high-rise apartment with a height of 100 m is also predicted. The results indicate that the generated electricity of the proposed small wind power system with integrated exhaust air duct is 1.7–1.9 times higher than that of the other systems tested. Especially, the generation of electricity increases by 9.9% and 6.2% for heights of 200 m and 300 m, respectively. This was based on the results for 100 m super high-rise buildings.