Theoretical Study on Optimal Design of Thermal Performance of Aerated Concrete-Based Composite Thermal Insulation Wall

Abstract:

A wall of aerated concrete only can hardly meet the requirements for energy-saving architectural design. If both sides of the wall are provided with thermal insulation mortar to form a composite wall, the heat transfer performance of the wall will be significantly improved. In this Paper, we established an optimization model for the thermal economy of a thermal insulation composite wall according to heat transfer theory and in consideration of the depreciation and maintenance costs of the wall during use, and took the average heat transfer coefficient and index of thermal inertia of the wall as restricted conditions to calculate and analyze the economical thickness of the thermal insulation layer. We expect the optimization model be valuable reference in promoting the application of aerated concrete-based composite thermal insulation walls.

• Periodical: Advanced Materials Research (Volumes 450-451)
• Pages: 663-666
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.450-451.663
• Online since: January 2012
• Authors: Fang Yang, Lin Zhu Sun, Zi Ling Xie
• Keywords: Aerated Concrete, Optimization Model, Thermal Performance

References

[58] 88.

[13] 00.

[16] 09.

[12] 02 Heat transfer coefficient(W/(m2. K).

85.

[1] 97.

[1] 97.

[1] 97 Index of thermal inertia.

[3] 16.

[3] 45.

[3] 45.

[3] 45 The following optimization model was established according to Eq. 11-13. Min A=2. 7765+555δ+0. 14/(0. 04962+δ) (14) S.T. = 0. 03827/(0. 07644+δ)+0. 02673/(0. 03299+δ)≤[λ] (15) = 3. 2792+14. 6154δ≥[D] (16) The optimally calculated thermal parameters through the model and the corresponding thickness data of thermal insulation layer are shown in Table 2 and Figs. 1-2. Table 2 Results of thermal insulation layer thickness calculation Thermal parameters W/( m2. K).

DOI: 10.1520/stp29293s

[15] 1.

[20] 1.

[28] 4.

[39] 4.

[54] 1 Thermal parameters(W/( m2. K).

[28] 4.

[49] 3.

[83] 5 117. 7 159 Fig. 1 Thickness calculation results of thermal Fig. 2 Thickness calculation results of thermal insulation layer when index of thermal inertia insulation layer when heat transfer coefficient is more than 3. 5 is less than 0. 8 Conclusion In this Paper, we established an optimization model for the thermal economy of a composite ther- mal insulation wall according to heat transfer theory and considering the depreciation and maintenance costs of the wall during use, and took the average heat transfer coefficientand index of thermal inertia of the wall as restricted conditions to calculate and analyze the economical thickness of thermal insulation layer of the aerated concrete-based thermal insulation composite wall. The results show that the economical thickness of thermal insulation layer is in a nonlinear increase trend with the decrease in the limiting value of the heat transfer coefficient and is rapidly increased with the increase in the index of thermal inertia; that the heat transfer coefficient of a wall is reduced with the increase in the thickness of thermal insulation layer and the index of thermal inertia of a wall is increased with the increase in the thickness of thermal insulation layer. The model is expected to provide guidance for optimal design of composite thermal insulation walls. Acknowledgements Major Project for Social Development of Wenzhou City S20090001, supported by Wenzhou City Special Fund for Building Energy Saving in (2009).