Identifications: the relative increase rates of cooling or heating energy consumption are approximate in different cities with the same increase of ventilation rate

This paper makes comparative research on the variation laws of energy consumption for model building with traditional envelop in Tampa of USA and Haʹerbin of China when ventilation rates increase from 0 to 1.5 vol./h. It can be found that the hourly, daily and monthly energy consumptions of heating increase more obviously than those of cooling, and also the absolute increment of the monthly energy consumption has great difference in cities with different climates for the same building with the same increase of ventilation rate. The hours, days and months in need of heating and cooling around a year are completely different in comparative cities and the difference in the hourly RVRs of energy consumption is also very great. Therefore, it is very difficult to infer the annual variation law of energy consumption from that of limited hours. When ventilation rates are made the same increase, the distribution laws of the increase rates of hourly, daily and monthly heating needs are very similar in comparative cities. Just the very similarity determines that annual heating RVRs are approximate under different climates. Moreover, the distribution laws of the hourly cooling RVRs in comparative cities have also similarity, which determines the inevitability of approximation of annual cooling RVRs under different climatic conditions.