INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Adsorption and Desorption Performance Evaluation Methods for Hygroscopic Materials:a Review |
CUI Yumeng, ZHANG Yufeng
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State Key Laboratory of Subtropical Building Science, School of Architecture, South China University of Technology, Guangzhou 510640, China |
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Abstract Poor humid environment has adverse effects on occupants' health and comfort, structure durability and building energy consumption. Humidity-related problems occur frequently in many buildings due to the focus on the design and control of temperature and the weakening or neglect of humidity. Making full use of hygroscopic materials is a zero-energy-consumption and green way of indoor humid environment conditioning, which has broad application prospects in the construction field.
Adsorption and desorption performance evaluation is the basis of development and application of hygroscopic materials, which currently can be carried out from three levels of material, system, and room. At the material level, the hygric properties of materials are examined. It is highly fundamental and can intuitively and accurately express the characteristics of materials with the mature and standardized test methods. It is yet limited on the long test cycle, the incomplete material database, and the limited function of evaluation indicators. At the system level, the material performance is evaluated under the dynamic conditions created by the laboratory. It has unique advantages compared with the other two levels as the test is simple and fast and the actual room boundary is partly taken into account. Some problems still need to be faced, such as misuse of indicators and insufficient consideration of actual sensitivity factors. At the room level, the performances of materials and rooms are truly evaluated in the actual scene. The evaluation at this level is the most reliable, but the existing evaluation indicators are quite limited and the test methods are not unified. In recent years, the research has been more in-depth. More attention was paid at the material level to the materials' properties diffe-rences in the standard and actual environments, the actual sensitivity factors of moisture buffer value were investigated at the system level, and more scientific evaluation methods were proposed at the room level based on the new calculation or performance indicators. Future research can also focus on the internal relationship among the three levels, and constructing a comprehensive evaluation system of ‘material-structure-space' by establishing the interaction channels.
Taking the moisture absorption and desorption performance evaluation method for hygroscopic materials as the main object, this paper syste-matically reviews and discusses the existing evaluation indicators and methods in aspects of characteristics and differences, uses and limitations, from three levels of materials, system, and room, to provide reference for the correct understanding, rational use and further research and deve-lopment of the evaluation method.
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Published: 28 December 2022
Online: 2023-01-03
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Fund:Program of China Scholarship Council (201906150064). |
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