Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

The purpose of this study is to provide basic information such as static pressure loss and friction factor and P-Q curves of aluminum flexible ducts, which are mainly used in ventilation systems. The aluminum flexible duct is then applied to the horizontal tube. Through the experiment, the effects of diameter, compression ratio, pitch interval, duct internal wind velocity, and Reynolds number of aluminium flexible ducts are measured and reviewed using statistical methods. The maximum static pressure loss was 138 Pa in a 100 mm duct, 62 Pa in 125 mm and 30 Pa in 150 mm. In addition, similar static pressure losses occurred at 25% and 50% of the duct compression ratio. The friction factor occurred up to 0.5 at 75% compression at 1 m duct with a diameter of 100 mm. Eight prediction models were derived by stepwise regression. All prediction models had R² of 0.8 or higher, but a number of values in response to the actual test were found to exceed 20 percent of the error. For the Gaussian process regression, the prediction model 6 was also very responsive with the determinant R² 0.99 and the RMSE 2.603.