摘要
The aim of the study is to evaluate both environmental damage and saving benefit in selecting building shading devices.The environmental damage from the produc-tion and construction(P&C)of shading devices is evaluated.The saving benefit,i.e.,decreasing building operation energy(OE),due to installing shading devices is evaluated.A simple office building module is used.The external shading devices are constructed from concrete-based external shading devices and aluminum-based light shelf devices.Energy design via Life Cycle Energy Assessment(LCEA)and environmental design via Life Cycle Assessments(LCA)are applied.Environmen-tal design is performed when PV energy generation is used.It was found that in energy design,40%of building OE saving benefit is required to compensate energy needed for the P&C of shading devices.In environmental design,100%of the building OE saving benefit is required to compensate for environmental damage stemming from the P&C of shading devices.It was concluded that in energy design,in addition to OE,P&C energy should be evaluated.In environmental design,due to a major reduction in the OE saving benefit,the importance of the P&C environmental damage increased.Environmental design cannot be replaced with energy design when PV energy generation is assumed for building OE needs.
