Login
Carbon dioxide included in exhaled breath is often used as a tracer gas when estimation of ventilation aspect in buildings with occupants is performed. Indoor carbon dioxide concentration is also adopted evaluation of ventilation commonly. It is needed for these investigations to grasp occupants’ carbon dioxide production rate accurately.
In previous studies by the authors (2014, 2016), equations for calculating carbon dioxide production rate based on Japanese subjects' exhaled breath data obtained by using Douglas bag method have been shown. These equations, whose variables are occupant’s height & weight, gender, age and Met, have been validated by measuring concentration of carbon dioxide in ventilated single zones with occupants.
This paper describes about investigated results of accuracy using one of the equations. Moreover, aiming at improving the precision in estimating indoor carbon dioxide concentration, estimation of Met value utilising wearable triaxial accelerometer or pulse rate monitor is examined and shown experimental results.