2022 Volume 37 Pages 13-24
The aim of this study is to develop a simple ventilation measurement method consisting of measurement and analysis methods by ventilation experiments using tracer gas in a model house considering daily life. This measurement system used carbon dioxide as the tracer gas, human expiration(CO2) as the source, and high performance sensor, microcomputer board and laptop as the measurement unit. This system can be made at a low cost. Inference of correct air change rate were obtained from measurements that included large fluctuations in carbon dioxide concentration due to the breathing of a person in the room, assuming initial values by regression analysis, and using least squares method and least absolute value methods.