Prediction Method of Pressure Drop in Chamber Boxes

Abstract

Chamber boxes are widely used in duct systems for air conditioning and ventilation; however, the optimal method for accurately predicting pressure drop has not been clarified. Here, various methods for predicting the pressure drop in chamber boxes were compared with those of the experimental results and computational fluid dynamics (CFD) simulations. The results showed that the proposed method, which sums the pressure drops at a duct outlet and inlet, had the highest prediction accuracy. This method is convenient as it does not require the chamber box dimensions. For in-line chamber boxes, this method yields a higher pressure drop than that in the experimental and CFD results, making it safer; however, a method for calculating closer values was also proposed.