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It is known that reducing the temperature setpoint is an effective heating energy saving measure for all kinds of buildings. This study focuses on the heating demand saving effect of the same buildings for different functional uses based on the same climatic background (Beijing) and the same reduction in the heating setpoint. Through comprehensive analysis of the absolute energy saving amount (ESA) and the relative energy saving ratio (ESR) from different time perspectives, the heating energy saving mechanism in reducing the heating temperature is discussed. Two types of completely different heating saving mechanisms were found: (1) the behavioural energy saving (BES) was dominated by those heating hours in which the outdoor air temperature or indoor integrated temperature was in the reducing range of heating setpoint, and(2) the energy saving of the temperature difference (ESTD) is dominated the rest heating hours. When the buildings were used for different functions, the annual ESA was determined by the numbers of the above two types of heating hours, and the annual heating ESR was mainly determined by the heating hours when the heating demand was large.

Is the heating energy saving effect by lowering the temperature setpoint similar in different functional buildings?