Development of a Numerical Model to Calculate Heat Transfer in a Cement-Based Material Incorporated with Expanded Perlit
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Development of a Numerical Model to Calculate Heat Transfer in a Cement‑Based Material Incorporated with Expanded Perlite Filled with Aerogel Honglin Zhang1 · Yong Tan1 · Ge Wang1 · Yao Nan1 · Liang Wang1 Received: 18 May 2020 / Accepted: 17 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract To solve the problem of high cost and low strength of aerogel-based building materials, expanded perlite filled with aerogel (EPA) has been made by filling the pores in the expanded perlite with aerogel. Adding EPA to cement-based material can reduce the thermal conductivity of the cement-based material. In this study, in order to investigate the thermal conductivity of materials with different content of graded expanded perlite filled with aerogel (GEPA) and non-graded expanded perlite filled with aerogel (NEPA), the experimental and numerical studies have been carried out. The cement-based materials incorporating the EPA (CEPA) have been prepared by replacing different volumes of sand with the NEPA or GEPA, and the thermal conductivity of the CEPA has been measured using the modified transient plane source technique. Based on the law of conservation of energy and the principle of heat transfer, the thermal conductivity models of the CEPA have been developed using the Jacobi iterative method. The results show that the decreasing degree of thermal conductivity of the CEPA is positively correlated with the content of the EPA, and the performance of the GEPA is better than that of the NEPA. As the numerical and experimental results are consistent with each other, the numerical model has been proved to be reasonable and feasible for being widely used to calculate the thermal conductivity of EPA cement-based material, which can be used in sustainable buildings. Keywords Cement-based material · Expanded perlite filled with aerogel · Heat transfer · Numerical model
* Honglin Zhang [email protected] 1
Xianyang Institute of Nonmetallic Minerals Research & Design Co., LTD, Xianyang 712000, China
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International Journal of Thermophysics
(2020) 41:148
1 Introduction In recent years, the rapidly increasing energy consumption has caused a crisis in energy supply and a number of environmental problems, such as ozone depletion, global warming, and air pollution. In 2018, China’s energy consumption grew by 3.7 %, the highest rate since 2012 [1]. In 2016, carbon emissions from buildings reached 1.96 billion tons, accounting for 9.4 % of China’s energy emissions; building energy consumption reached 899 million tce, accounting for 20.6 % of China’s energy consumption. The building energy consumption caused by the building envelope accounted for 8 %–25 % [2]. In severe cold and cold regions, the heat consumption caused by heat transfer of building exterior walls accounted for more than 28 % of the heat consumption of the building envelope [3]. Therefore, the use of thermal insulation materials in the building envelope can improve the thermal insulation p
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