Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16707
Title: The effects of external wall insulation thickness on annual cooling and heating energy uses under different climates
Authors: Pan, D
Chan, M 
Deng, S 
Lin, Z
Keywords: Annual cooling and heating energy uses
Energy Gain Ratio (EGR)
External wall insulation
Relative Variation Ratio (RVR) of the sum of annual cooling and heating energy uses
Thickness
Issue Date: 2012
Publisher: Pergamon Press
Source: Applied energy, 2012, v. 97, p. 313-318 How to cite?
Journal: Applied energy 
Abstract: External wall insulation plays an important role in building energy consumption through affecting cooling and heating energy uses. In this paper, a study on the effects of external wall insulation thickness on annual cooling and heating energy uses under different Chinese climates is reported. Firstly, two indexes: Energy Gain Ratio (EGR) and Relative Variation Ratio (RVR) of the sum of annual cooling and heating energy uses, to assess the effects of external wall insulation thickness on energy saving potential are introduced. Secondly, a model space having four different exterior zones facing four different orientations in an office building is presented and the settings of the model space described. Lastly, the simulated annual cooling and heating energy uses for the four different exterior zones at different external wall insulation thicknesses under three different climates in China, Guangzhou, Shanghai and Beijing, are reported. The results suggested that energy saving was significant by increasing the external wall insulation thickness in exterior zones facing all orientations under Beijing's climate, since the heating energy use was dominant and can be reduced remarkably with the increase in insulation thickness. Under Shanghai's climate, increasing external wall insulation thickness to over 26. mm would not reduce the sum of annual heating and cooling energy uses in the south-facing exterior zone, but would help save energy in exterior zones facing the other three orientations. For all exterior zones under Guangzhou's climate, it was, however, hardly possible to reduce the sum of annual heating and cooling energy uses by increasing the external wall insulation thickness.
URI: http://hdl.handle.net/10397/16707
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2011.12.009
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