Study on a new correlation between diffusion coefficient and temperature in porous building materials |
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| Authors: | Qinqin Deng Xudong Yang Jianshun Zhang |
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| Affiliation: | 1. Department of Building Science, Tsinghua University, Beijing 100084, PR China;2. Building Energy and Environmental Systems Laboratory, Department of Mechanical and Aerospace Engineering, Syracuse University, Syracuse, USA;1. U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA;2. Arcadis, 4915 Prospectus Drive, Suite F, Durham, NC 27713, USA;1. School of Architecture and Urban Planning, Nanjing University, Nanjing 210093, PR China;2. Department of Building Science, Tsinghua University, Beijing 100084, PR China;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China;3. Beijing Key Laboratory for Indoor Air Quality Evaluation and Control, Beijing 100084, China |
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| Abstract: | The diffusion coefficient (D) and partition coefficient (Kma) are the two important parameters used to predict the volatile organic compound (VOC) emission or sorption characteristics in porous building materials. D and Kma may be strongly affected by temperature (T). In this study, we derived a new correlation between D and T based on the assumption that molecular diffusion is dominant, and evaluated this correlation using a series of existing experimental data. The modeling results using the new correlation agree well with the experimental data. The correlation would be useful for assessment of indoor air quality under different environmental (temperature) conditions. |
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