Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80598
Title: Optimal thickness determination of insulating air layers in building envelopes
Authors: Zhang, T 
Yang, H 
Keywords: Building envelopes
Flow and heat transfer
Insulating air layer
Optimal thickness
Issue Date: 2018
Publisher: Elsevier
Source: Energy procedia, 2018, v. 152, p. 444-449 How to cite?
Journal: Energy procedia 
Abstract: In building envelopes, using enclosed air layer becomes a popular way of thermal insulation, since the air has a much lower conductivity coefficient, and is much cheaper than other building materials. The motivation of this research is to investigate the coupled convective and radiative heat transfer in the air layer of building envelopes, in order to find the optimal geometrical parameters of the insulating air layers. Based on CFD technology, a Ra number judgment basis is summarized for flow pattern judge in insulation air layers, and the coupled convective and radiative heat transfer characteristics across the air layer is analyzed. The results indicated that a larger layer height results in a weaker convective heat transfer; when the thickness is below 20mm, an increasing thickness leads to a considerable decrease in the heat transfer; but when thickness exceeds 20mm, the heat transfer is slightly influenced by the thickness. The optimal thickness of the insulation air layer is 20-30mm depending on the climate condition.
Description: 2018 Applied Energy Symposium and Forum, Carbon Capture, Utilization and Storage, CCUS 2018, Perth, Australia, 27-29 June 2018
URI: http://hdl.handle.net/10397/80598
EISSN: 1876-6102
DOI: 10.1016/j.egypro.2018.09.251
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