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Analytical analysis of the thermal performance of building walls based on the thermal-electric analogy method.

Number: pap. 443

Author(s) : CHENG R., ZHANG Y., WANG X.

Summary

Dynamic thermal performance analysis of building wall is of great importance in analysing building energy consumption. However, conventional methods are usually complex for engineering applications and their physical mechanisms are not so clear. In order to simplify the analytical process with a clear physical mechanism and investigate the energy transferred in the dynamic heat transfer process from both quality and quantity perspectives, a new analysis method based on the thermal-electric analogy was proposed in this paper. The thermal network model of the dynamic heat transfer process of the external wall was built based on the thermal-electric analogy method. Several novel parameters such as thermal impedance and heat transfer dispassion were proposed, which can effectively simplify the analytical process and offer some novel insights. The results showed: (1) the proposed new parameter thermal impedance can simultaneously reflect the co-resistant effect of thermal resistance and thermal capacitance. It will decrease with larger thermal conductivity and thermal capacitance; (2) there were three kinds of heat transfer dispassion in the dynamic heat transfer process. The part caused by thermal resistance was irreversible, and the part caused by thermal capacitance was reversible; (3) the extreme of heat transfer dispassion in the Thevenin’s equivalent circuit really corresponded to the extreme of the heat flux transferred in one cycle. However the real heat transfer dispassion of all nodes didn’t. The proposed novel concept and method can be used to build an equivalent thermal network in a built environment, which can provide a much simplified but more effective method with clear physical mechanism for engineering applications.

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Pages: 10 p.

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Details

  • Original title: Analytical analysis of the thermal performance of building walls based on the thermal-electric analogy method.
  • Record ID : 30009115
  • Languages: English
  • Subject: Environment
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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