Preparation,Thermal-Humidity Property And Application Simulation Of Phase Change And Humidity Storage Materials

As indoor living environment is required more higher continually,issues about how to keep the balance among comfort degree,energy conservation and environment protection have become a hot topic in the research field of modern building energy conservation.And how to use the passive self-adjustment ability?i.e.,phase change and temperature controlling property,humidity storage and humidity controlling property?of the material has become the research focus already.Considering the building energy conservation exerted by material,this research cannot only relieve the matching contradiction between supply and demand of building energy conservation in terms of time and intensity,so as to reduce the energy consumption and improve the indoor air,but also store and use solar energy effectively and other low-cost clean energy to realize the win-win of environment and economy,all which can provide powerful technical support to promote the sustainable development of building greenization.Phase change material and humidity controlling material were used as element material in this research.First,sol-gel method was applied to prepare phase change and humidity storage composites,of which the optimal preparation parameters,preparation mechanism and phase change and humidity storage mechanism were mainly studied.And the composite material was combined with current building material to prepare the gypsum-based phase change and humidity storage material,in order to research its properties.Then,the electrospinning method was used to explore the preparation of phase change and humidity storage fiber,which was combined with current building material to make gypsum-based phase change and humidity storage fiber composite material,so as to explore the influence of preparation parameters on morphology of phase change and humidity storage fiber and properties of gypsum-based phase change and humidity storage fiber composite material.Finally,theoretical analysis,numerical simulation and field test were combined to analyze the coupled heat and moisture transfer mechanism of gypsum-based phase change and humidity storage material,so as to establish the coupled heat and moisture transfer model of gypsum-based phase change and humidity storage wall,using temperature and relative humidity as the driving potential of heat and moisture transfer.Also,the model was verified by field test.The basic research contents are as follows:The first part,the research background and practical significance were stated respectively,and research progress of phase change material,humidity controlling material,phase change and humidity storage composites were concluded and summarized,so as to find out the research approach of the preparation,property test and application simulation of building phase change and humidity storage material.The second part,influence of preparation parameters on texture of fatty acid/SiO₂ phase change and humidity storage composites was researched,in order to realized satisfied intersertal-coated structure of phase change and humidity storage composites and reach the nanoscale to the greatest extent.Influence of preparation parameters on the combination property?i.e.,humidity storage and controlling property,phase change and temperature controlling property?of fatty acid/SiO₂ phase change and humidity storage composites were studied,in order to obtain the optimal preparation parameters of making decanoic acid-palmitic acid/SiO₂ phase change and humidity storage composites.Aimed at property test and analysis of optimal decanoic acid-palmitic acid/SiO₂ phase change and humidity storage composites,thus,the preparation mechanism as well as phase change and humidity storage mechanism of optimal decanoic acid-palmitic acid/SiO₂ phase change and humidity storage composites was revealed.Optimal decanoic acid-palmitic acid/SiO₂ phase change and humidity storage composites and gypsum were recombined to form the phase change and humidity storage composites.Then,the mechanical property,humidity storage and controlling property,phase change and temperature controlling property were tested and analyzed respectively.The third part conducted exploratory preparation of phase change and humidity fiber,and studied the effect of preparation parameters on morphology of phase change and humidity storage fiber.Then,phase change and humidity storage fiber was combined with gypsum to form the gypsum-based phase change and humidity storage fiber composite material,of which the properties were tested and analyzed.The coupled heat and moisture transfer mechanism of gypsum-based phase change and humidity storages was analyzed in the fourth part.With temperature and relative humidity as the driving potential,the coupled heat and moisture transfer model of gypsum-based phase change and humidity storage wall was established.The main thermal-humidity physical property parameters of gypsum-based phase change and humidity storage material was test experimentally,and they were verified through the coupled heat and moisture transfer model of gypsum-based phase change and humidity storage wall.Finally,all the contents were concluded and further research was proposed.