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The purpose of this study is to show explicitly a series of exergy input, output, and consumption for daylighting, electric-lighting, and space heating/cooling system and hence to reveal how daylighting system consumes solar exergy and how electric-lighting, and heating, and cooling systems consume exergy originally contained by fossil fuel. The merit of exergy calculation is that we can explicitly and thoroughly show how different types of energy are used as a series of exergy consumption at different parts of a system. We first show how to calculate exergy consumed by a system during a given period. We, then, show the result of a calculation of annual exergy consumption for the whole of an architectural environmental system. We assumed two cases : one is a case of a double glazed window with interior Venetian blinds, and the other is a case of a double glazed window with exterior Venetian blinds. The results show the followings. The total amount of solar exergy consumption of the two cases are almost equal to each other, but the ways of solar exergy consumption are different. The consumed exergy, which originates from LNG, in the case of exterior Venetian blinds was smaller than that of the room with interior Venetian blinds.