Abstract
Thermal insulation is one of the most effective methods to reduce the energy loss through building envelopes because of its low thermal conductivity. However, moisture ingress driven by the pressure gradient across the insulation may lead to a variation of the thermal conductivity, which highly deteriorates the thermal performance of building envelopes and further affects the heating/cooling loads. In this paper, a novel simultaneous test method based on the guarded hot box is proposed to investigate the simultaneous variations of moisture content and effective thermal conductivity of thermal insulation. Two types of aerogel blanket are selected as test specimens. The variations of thermal conductivity versus temperature and moisture are measured and compared. Besides, the variations on the appearance of test samples are also discussed in detail.
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Acknowledgements
The authors would like to thank the National Natural Science Foundation of China (Grant No. 51706078) for funding and supporting this work. The authors also acknowledge the Analytical and Testing Center of HUST for providing relevant SEM photos.
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Guo, H., Cai, S., Wang, X., Fang, D., Li, K. (2020). Simultaneous Test of Heat and Moisture Transfer in Aerogel Blankets. In: Wang, Z., Zhu, Y., Wang, F., Wang, P., Shen, C., Liu, J. (eds) Proceedings of the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019). ISHVAC 2019. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-9528-4_101
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DOI: https://doi.org/10.1007/978-981-13-9528-4_101
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