PASSIVE MOISTURE CONTROL RESEARCH USING ONE KIND OF NANOPOROUS MATERIALS

摘要

Humidity levels in a building significantly affect comfort of occupants and performance of air conditioning system.High or low humidity levels will make occupants feel uncomfortable. Decreasing temperature set point of air conditioner may obtain thermal comfort while the humidity levels are high. However, it should increase the space heat gain and energy used for air conditioning. Furthermore, high humidity levels will accelerate the growth of mold, mildew and deterioration of building materials. The arising humidity levels may be due to the intermittent operation of air conditioning system, moisture sources in the building, infiltration and so on. In addition, moisture adsorption/desorption effects at interior building surfaces may be an important component of the latent space cooling load when a building is operated with day air conditioning and night ventilation. The moisture adsorption provides a storage capacity for indoor moisture which is similar to the capacitance of thermal mass for sensible heat. The primary motivation for this research is to determine the moisture capacitance of one kind ofnanoporous material. Sorption isotherm measurements were carried out for common four building materials and the nanoporous materials. Experimental results showed that this kind of nanoporous silicon gel material will assist us to maintain the relative humidity of the environment.