An empirical approach: Prediction method of air pressure distribution on building vertical drainage stack

Pressure fluctuation control in vertical drainage stacks has been identified as important to insure sanitary drainage performance in early empirical studies. Chaotic plumbing and over-design are common in utility services within building envelopes from domestic investigations in Taiwan. Considerable progress has been made in predicting the air pressure distribution within vertical drainage stacks. Following previous research, this paper focuses on an empirical approach to air pressure prediction in vertical drainage stacks. An experimental device that simulates a medium high apartment was set up to provide empirical parameters and model verification. Comparisons between the measured data and calculated values reveal that this prediction model can reproduce the mean air pressure distribution value in a vertical drainage stack given single point discharge and steady flow conditions.