Classified identifications: the annual relative variation rates (RVRs) of energy consumption are approximate in different cities with the same shading coefficient

Abstract

By research on the variation laws of annual heating and cooling energy consumption and their RVRs with sun-shading coefficient in all the hours with and without solar radiation in three cities (Tampa, Sterling of USA and Fuzhou of China) respectively, we can find that: in winter, the proportion of the heating energy consumption in all the hours with solar radiation in the annual heating needs is very small (less than 15%), the influence of shading measures on the annual total heating energy consumption and its RVRs is not so significant. And thus the predictions of DOE-2 on the effect of shading measures on the annual heating energy consumption deserve further study. However, in summer, the proportion of the cooling needs of each hour with solar radiation in the annual total cooling needs is very large (more than 95%), therefore the influence of shading measures on the annual cooling energy consumption and its RVRs is very great. And hence the predictions of DOE-2 and CTM are both reasonable. By comparative analysis on two representative cities, we can find out that under the same sun-shading coefficient, the annual heating RVRs and the annual cooling RVRs are both approximate in different cities. By further analysis on the distributions of the daily heating and cooling RVRs, the monthly heating and cooling energy consumption and its RVRs in Sterling with different shading measures, we can find out that sun-shading coefficient has a far less impact on the annual heating energy consumption than on the annual cooling needs.