Taiwan is located in the subtropics and has a climate with high temperature and humidity, which leads to high indoor moisture that causes biological pollutants. A moisture buffering effect is proposed to improve indoor air quality and human health. The hygroscopic character of Douglas fir is investigated as a parameter for numerical simulation. Additionally, the EMPD (Effective Moisture Penetration Depth) method is carried out using the program EnergyPlus to simulate moisture buffering performance with varying ventilation rates and quantities of Douglas fir. The results showed that Douglas fir can moderate the indoor moisture variation to decrease the appearance frequency of high humidity and to improve indoor air quality.
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