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Analysis and Distributed Control of HVAC Systems


Ph. Rostalski

NCCR MICS Workshop 2007, Neuchâtel, Talk and Poster

The effect of sensor and actuator positioning in a novel exhaust-driven mechanical displacement ventilation systems is analyzed. As in all displacement ventilation systems the development of a stable multilayer stratification is the key for an efficient exchange of air. It is shown that the contaminant handling may be highly effected by the choice and positioning of sensors and actuators. The presence of strong heat sources might lead to a configuration with a thick top-layer, acting as a reduced ceiling in view of exhaust produced by weaker sources of heat e.g. human beings. A proper sensor positioning together with an appropriate design using distributed exhaust-fans can have a strong influence on the efficiency of the overall ventilation concept. To quantify the effects, a first principle, mathematical model is developed and compared to the results of small scale experiments. These experiments confirmed the predictions made by the model. Several scenarios with qualitatively different behavior were examined.


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