抄録
To keep air-quality clean, ventilation is most important thing. The ventilation system has 2 type systems, one is central-system and another is package-system. The central-system can control ventilation rate using CO_2 monitor but the package-system doesn't, because of its high-cost. We have experimented application of low-cost semiconductor sensor to package-system to control ventilation rate. We report the correlation between semiconductor sensor output and CO_2 concentrate, and the result of energy saving by reducing ventilation rate.
