Indoor Air Quality

Moisture Buffering Material & Indoor Humidity Control

Located in the subtropical area, average yearly relative humidity of plain urban in Taiwan are above 75%. High humidity indoor environment makes the surface of interior materials a great breeding ground for microorganism such as mold which successively causes biological pollutant of indoor air and threatens the health of the space occupants. Many foreign studies indicate that porous materials passively reduce the variation range of indoor humidity to effectively improve the problem of moisture. In contrast, reducing the humidity variation range is not effective in Taiwan, since the humidity range of Taiwan often appears at a relatively high rate which requires active strategy to remove moisture.

The lab focus on applying moisture buffering materials specifically for Taiwan’s tropical weather. We conduct ISO standard experiment with constant temperature and humidity chamber to collect material data of moisture conductivity, equilibrium moisture percentage, and moisture absorption and desorption capability. Subsequently, study those data by operating HAM specific algorithm and effective moisture penetration depth simplified algorithm with EnergyPlus™, the whole building energy simulation program, developed by Department of Energy (DOE) of the United States.
Below are ongoing projects:
[1] Humidity properties measurement and database establishment of materials
[2] Simplified algorithm for simulation of moisture buffering materials in the condition of Taiwan weather.
[3] Compatible material selection proposals on humidity buffering and ventilation strategy in the condition of Taiwan weather.
[4] Indoor air pollutant decreasing assessments of moisture buffering materials using mold germination

Constant temperature and humidity chamberSimulation result of indoor relative humidity on with/without moisture buffering materialsIndoor air quality assessment using mold germination graph method

VOCs Absorptive Material

After the implement of Indoor Air Quality Act, indoor air quality in Taiwan has reached a new milestone. It has recently caught much attention that moderating and controlling the concentration of chemical contaminants indoors passively with porous materials. However, test method for determination of absorptive materials such as ISO, JIS, CNS, etc. was established in the condition of constant temperature and humidity while the ventilation volume is fixed. Thus, it needs further analysis on the long-term performance of absorptive materials and hence the effect on the occupants’ health, since the air condition including temperature and humidity varies along with the property of space use.

The lab prepares the performance data of absorptive materials by operating ISO standard experiment with small emission test chamber for later on analysis computing.

Since the commercial software is by now incapable of analyzing targets in a long term, the lab applies Fortran programming language for computing the diffusion pattern of heat and particles in the building material and between the material and the indoor air.

Below are ongoing projects:
[1] Simulations on reducing concentrations of indoor Formaldehyde by applying absorptive building materials for long-terms
[2] Property measurement and database establishment of absorptive building materials

Langmuir isotherm patterns in different temperature of absorptive materials by experimentStatistics of indoor air concentrations with/without absorptive building materials (as long-term simulation result)