Study on properties of phase change foam concrete block mixed with paraffin / fumed silica composite phase change material
Section snippets
Introduction and research background
With the rapid development of urbanization, the building industry has become the largest energy-consuming sector and accounts for about 40% of total energy consumption [1,2]. Various on-site renewable energy generation systems, such as solar collectors [3,4] and wind turbine [5], were developed by researchers to supply energy for buildings. However, these renewable systems are often economically infeasible due to unstable energy sources and large peak energy loads. Larger generation and storage
Raw materials and equipment
In this study, Paraffin (melting point of about 44 °C) was purchased from Hangzhou Luer New Material Technology Co., Ltd. Fumed silica AEROSIL R106 (Degussa AG, Hydrophobic type) was purchased from Xiaoguwei Drilling Laboratory Analysis Instrument Cooperation in Guangzhou, China. Cement P·O42.5 (Conch cement with a density is 3100 kg/m3) was produced by the Haimen Conch, China. Hydrogen peroxide foaming agent was produced by Fujian Yinzhou Wanke Coating Energy Saving Building Materials Co.,
Morphology and thermophysical properties of paraffin/fumed silica composite PCM
Fig. 3 shows the PCM samples with paraffin content of 45% (wt), 50% (wt) and 55% (wt). As can be seen from Fig. 3, with the increase of paraffin content, the agglomeration becomes more obvious. Among them, the sample with 55% (wt) paraffin has the highest agglomeration level.
Followed the experiment settings in Section 2.2, Table 1 shows the results of a liquid leakage test. Based on the table, the composite PCM with paraffin content of 55% (wt) has the highest leakage level, while the sample
Conclusion
“Passive” building design aims to improve the thermal conductivities of the building envelope to reduce the heating and cooling loads. This study proposed a novel phase change foam concrete, which is able to mitigate the temperature fluctuation by storing heat during the daily heat peak. By doing so, the buildings are able to select renewable energy generating systems with smaller size and lower capital investment. In order to assess the thermal properties and optimize the material composition,
Acknowledgement
This work was supported by Guangzhou Science and Technology Program (201704030137), the Research Project of Guangdong Province (2017A050506058), and the Major Research Project of Guangdong Provincial Department of Education (No. 2016KZDXM035).
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