How is building energy used related with occupants behaviors and the building usage modes?

Jiang Yi
Building energy data around the world have been given based on statistical data combined with some case study data for both office buildings and residential. Very large differences have been found for same function buildings between different countries. Study has been made to understand the reasons for these differences. It shows that the differences are not due to the difference in technics used in these buildings but caused by different usage modes and the behaviors of the occupants. Simulation mode has then developed to modelling the building energy performance under different usages. It shows how large difference in energy use the occupant behavior can cause. According to the total energy that the earth can provide us for operate buildings for whole human settlement, we need both energy saving technologies and energy saving usage modes. However further study has discovered that most of energy saving technics are heavy relyed on the real occupant behaviors and building usage modes. Some technics appears great saving with high energy usage mode but cannot make any change when working at low energy usage modes. Vice versa, some measures work very well when the building operated at low energy mode but may raise energy when operated at high energy mode. Therefrom, what should be the reference usage mode when we evaluate the building energy performance at the design stage or when we evaluate an energy saving technic? It is very important to set up right for the reference usage mode according to the real possible usage modes.