Computational Fluid Dynamics Analysis of Flexible Duct Junction Box Design

Investigation of Forced-Air Duct Leakage Phenomenon Using CFD Methods for Underground Tunnel Construction

“…To assess the network quality, the parameter Skewness was used, which is one of the primary measures of network quality. Skewness determines how close a cell shape is to ideal shape [13]. The ideal element is in case of value 0, while 1 means a completely degenerated element.…”

Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes

“…Recommended Configurations IBACOS' research found that pressure losses and the associated calculated EL values of junction boxes can vary considerably, based on the configuration, the number of flow splits desired, the location of the outlets in the box, the size of the box, the airflow through the box, and the incoming and outgoing velocities (Beach et al 2013). As a result of that research, IBACOS recommends that the following junction box configurations are optimal:…”

“…IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations (Beach et al 2013). These recommendations can help to ensure that a system aligns more closely with the design and the occupants' comfort expectations.…”

Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes

“…Place the branch attached to the second junction box at the back of the first junction box. IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations (Beach et al 2013). As a result, this measure guideline is intended to offer additional recommendations for optimizing flexible duct, constant-volume HVAC systems using junction boxes within ACCA Manual D guidance (Rutkowski 2009).…”

“…ACCA Manual D assigns a 15-ft EL for a metal wye fitting, whereas a junction box receives a significantly higher EL of 95 ft for a reference velocity of 900 ft per minute (fpm). The technical report by Beach et al (2013) discusses this issue in more detail.…”