Abstract
The purpose of this study is to find the control strategies for ventilation and energy reduction with appropriate maintenance of indoor contaminant levels. According to a survey in other research, many mechanical ventilation systems are not often operated by residents, because residents tend to avoid powering their ventilation system in order to save utility cost. There isn't anything to inform sufficiently how to operating ventilation system for IAQ(Indoor Air Quality). And then, without any sufficient ventilation control strategies, it would be very difficult to improve IAQ by an occupant's manual control. If the ventilation unit is operating for 24 hour, the energy consumption would be dramatically increased. Therefore, the sensor based DCV control method is necessary for comfort and energy saving. It has been simulated both of $CO_2$ and TVOC sensors based DCV system for operating mechanical ventilation system. As a result of analysis, $CO_2$-DCV is not sufficient to maintain for comfort IAQ against TVOC from building materials and furnitures. Because $CO_2$ is generated irregularly by occupant's schedules in individual room, but TVOC is emitted steadily from the finishing materials Therefore, $CO_2$-DCV couldn't control the chemical contaminants like TVOC as below as the guideline. We must consider whether chemical contaminants are a proper target for control in an apartment house or not, because TVOC are more dangerous than $CO_2$.
