Air infiltration rates in the bedrooms of 202 residences and estimated parametric infiltration rate distribution in Guangzhou, China

This study investigates the overnight air infiltration rates of 202 natural ventilated bedrooms, measured in August to September 2016 (cooling season) in Guangzhou, China. The rates were calculated and analyzed based on a single zone mass balance equation, using CO2 produced by the sleeping occupants as tracer gas source. It was found that additional ventilation is required to satisfy the Chinese building code, where only 16% had the minimum required amount of ventilation. The air infiltration rates fit a log-normal distribution (R2 = 0.85) ranging from 0.05 to 1.32 h−1, with an arithmetic mean of 0.41 h−1. None of these parameters had an effect on the air infiltration rate distribution: Absolute indoor and outdoor temperature difference, window age, building type (two different window standards), floor level of bedroom and openable window area. The provided data can be used in analyzing cooling energy and indoor air quality from outdoor pollution in natural ventilated residential buildings in south China.