Abstract
This article compares various techniques for the control of indoor air quality in a naturally ventilated building: ON-OFF, proportional-integral-derivative PID, proportional-integral with deadband PIdb, and fuzzy control. The control system for the fuzzy controllers is a typical two input carbon dioxide concentration and its time derivative, one output change in window opening area system. Two different fuzzy controllers are modeled: one based on Mamdani's max-min inference, and the other using Gupta's multivariable structure. The results show that the fuzzy controllers and the Pldb controller are much more suitable than the PID or the ON-OFF controllers. The number of cycles of the controlled parameter i.e., the window opening fluctuations is actually much smaller. Minor differences between the two fuzzy controllers are observed.
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