Influence of SiC on heat transfer efficiency and mechanical properties of cement-based materials

被引：0
|
作者：
Du Y. [1 ]
Huang W. [1 ]
Dai M. [1 ]
Ma C. [2 ]
Guo H. [3 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] Institute of Urban Intelligent Transportation and Safety Operation and Maintenance, Shenzhen University, Shenzhen
[3] Shandong Binzhou Highway Engineering Co. Ltd., Binzhou
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 05期
基金：
中国国家自然科学基金;
关键词：
floor heating system; heating efficiency; mechanical properties; microstructure; SiC; thermal properties;
D O I：
10.11817/j.issn.1672-7207.2023.05.008
中图分类号：
学科分类号：
摘要：
In order to improve the heating efficiency of floor heating system(FHS) for reducing heating energy consumption, different contents of SiC were used as admixture to prepare cement-based composites materials(CCMs) used in the filling layer of FHS. The mechanical and thermal properties of specimens were characterized by microstructure analysis, thermal stability, compressive/flexural strength, thermal conductivity and indoor water-bath heating test. The results reveal that SiC has smooth textures and is irregularly shaped, and it is wrapped by hydration products with good dispersion and structural integrity. The introduction of SiC does not produce new chemical reactions. With the increase of SiC content, more macro-pores and weak areas are found in the hydration system, accompanied with reducing cement hydration degree. The compressive and flexural strength of CCMs increase firstly and then decrease with the increasing content of SiC. The introduction of SiC leads to better thermal stability and higher thermal conductivity of CCMs. Compared with control group, the maximum thermal coefficient of CCMs can be increased by 140.8%, and heat loss rate within the FHS operating range can be reduced by nearly 6%. The simulation heating efficiency of FHS is improved with increasing SiC content, and the heating efficiency can be improved by up to 23.6%. © 2023 Central South University of Technology. All rights reserved.
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页码：1730 / 1738
页数：8
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共 25 条
  • [1] ZHANG Hongzhi, HAN Zongwei, YANG Lingyan, Et al., Influence of pipe length design method on long-term performance of ground source heat pump, Journal of Central South University(Science and Technology), 52, 6, pp. 1846-1853, (2021)
  • [2] ZHAO Libo, RAO Zhenghua, DAI Wenting, Et al., Experimental study of heat transfer in room with radiant floor heating and mixing ventilation system, Journal of Central South University(Science and Technology), 46, 11, pp. 4348-4354, (2015)
  • [3] ZHUANG Zhi, LI Yuguo, CHEN Bin, Et al., Chinese Kang as a domestic heating system in rural Northern China: a review, Energy and Buildings, 41, 1, pp. 111-119, (2009)
  • [4] CHUA K J, CHOU S K, YANG W M, Et al., Achieving better energy-efficient air conditioning-A review of technologies and strategies, Applied Energy, 104, pp. 87-104, (2013)
  • [5] KARABAY H, ARICI M, SANDIK M, A numerical investigation of fluid flow and heat transfer inside a room for floor heating and wall heating systems, Energy and Buildings, 67, pp. 471-478, (2013)
  • [6] SUN Mingqing, MU Xinying, WANG Xiaoying, Et al., Experimental studies on the indoor electrical floor heating system with carbon black mortar slabs, Energy and Buildings, 40, 6, pp. 1094-1100, (2008)
  • [7] JIN Xing, ZHANG Xiaosong, LUO Yajun, A calculation method for the floor surface temperature in radiant floor system, Energy and Buildings, 42, 10, pp. 1753-1758, (2010)
  • [8] DING Pei, LI Yanru, LONG Enshen, Et al., Study on heating capacity and heat loss of capillary radiant floor heating systems, Applied Thermal Engineering, 165, (2020)
  • [9] LI Qingqing, ZHANG Ye, GUO Tieming, Et al., Development of a new method to estimate thermal performance of multilayer radiant floor, Journal of Building Engineering, 33, (2021)
  • [10] LIU Kai, WANG Zhi, JIN Can, Et al., An experimental study on thermal conductivity of iron ore sand cement mortar, Construction and Building Materials, 101, pp. 932-941, (2015)
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