COMPARISON OF CONVENTIONAL AND FUZZY CONTROL OF INDOOR AIR-QUALITY INBUILDINGS

This article compares various techniques for the control of indoor air quality in a naturally ventilated building: ON-OFF, proportional-inre gral-derivative (PID), proportional-integral with deadband (PIdb), and fuzzy control. The control system for the fuzzy controllers is a typi cal 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, an d the other using Gupta's multivariable structure. The results show th at the fuzzy controllers and the PIdb controller are much more suitabl e than the PID or the ON-OFF controllers. The number of cycles of the controlled parameter (i.e., the window opening fluctuations) is actual ly much smaller. Minor differences between the two fuzzy controllers a re observed. (C) 1996 John Wiley and Sons, Inc.