Surface Moisture Absorption And Desorption On The Indoor Humidity And Moisture Load Within The Building Envelope

The humidity is one of important factor for thermal comfort and indoor air quality (IAQ). Moisture absorption and desorption feature of inner building envelope influenced indoor humidity and humidity load.Study on moisture absorption and desorption process of inner building envelope have absorbed more and more attention of researchers, but relative researches are too less, with people's request for indoor thermal environment and construction energy conservation enhanced, the research in this field becoming more and more urgent. In most cases, the existing air-conditioning system only ensured the temperature demand, but failed to ensure the humidity request. This thesis sets the moisture absorption and desorption process of inner building envelope as an engineering background, and studied the moisture transfer in porous media, and studied the moisture absorption and desorption process of inner building envelope's influence for indoor humidity and humidity load, based on it.This thesis first reviewed the researches for heat and moisture transfer in porous media and indoor heat and moisture model, according to application on real project, based on Fick theorem and Darcy theorem, deduced the heat and moisture process in porous media, established mathematical model, carried on the value simulation, researched the heat and moisture transfer in porous media under different kinds of conditions, such as decided parameter and variable parameter. In this foundation, established the indoor humidity model that considered the moisture absorption and desorption process of inner building envelope, researched the change of indoor humidity under many outer condition: in different inner surface material, different air-conditioning modes, and different initial humidity content of inner surface. Obtained the moisture absorption and desorption process of inner building envelope's influence effect for indoor humidity in different conditions, and researched the moisture absorption and desorption process of inner building envelope's influence for humidity load, and provided the relevant results with the form, had some practical value to application on engineering.