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Thermal Performance Research and Optimal Design of Concrete Self-insulation Compound Block(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年01期
Page:
87-96
Research Field:
混凝土结构
Publishing date:

Info

Title:
Thermal Performance Research and Optimal Design of Concrete Self-insulation Compound Block
Author(s):
SUI Xue-min1;  GONG Shu-kuan1; 2;  XU Biao1;  HUANG Hua1
(1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. CITIC General Institute of Architectural Design and Research Co., Ltd., Wuhan 430014, Hubei, China)
Keywords:
self-insulation block;  thermal performance;  numerical simulation;  hole pattern optimization;  heat transmission coefficient
PACS:
TU522.3
DOI:
10.19815/j.jace.2021.02011
Abstract:
In response to the thermal insulation requirements of wall in residential buildings in cold zones, seven schemes of concrete self-insulation compound block were designed. The finite element analysis software ANSYS was used to simulate the heat transmission of block, and the effects of the distribution of holes on the thermal resistance of self-insulation blocks under the same porosity rate were compared. According to the influence characteristics, the thermal performance of the block was optimized, and an optimized design scheme for blocks with three rows of staggered columns holes which filled with thermal insulation materials to block the heat flow on the side walls of the block, and thick outside holes and narrow inside holes was proposed. The results show that the increase of the row number of holes makes the thermal resistance of the block increase, and the increase of the column number of holes makes the thermal resistance of the block decrease. The staggered column distribution of holes can better improve the thermal resistance of the block and the thickness ratio of the outer hole and the inner hole should be 1.6-2.0. The proposed thermal conduction resistance of the optimal self-insulation block reaches 2.37 m2·K·W-1, the equivalent thermal conductivity is 0.118 W·m-1·K-1, and the compressive strength is 8.7 MPa. The compressive strength meets the design requirements of self-insulation blocks for external self-supporting walls. The heat transmission coefficient of the self-insulating wall built with this optimal block is 0.428 W·m-2·K-1, which meets the design standard of 75% energy saving for residential buildings in cold zones of China, and the heat transmission coefficient is reduced by 23% compared to the external thermal insulation walls with the same materials and wall thickness.

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Last Update: 2021-02-10