Whole building energy simulation and energy saving potential analysis of a large public building

By comparing EnergyPlus with other energy simulation tools, this paper explores how to use EnergyPlus to construct models to accurately simulate complex building systems as well as the interrelationships among sub-systems such as HVAC, lighting and service hot water systems. Then energy consumption and cost of a large public building is simulated and calculated for LEED certification using EnergyPlus. ASHRAE baseline model is constructed according to ASHRAE 90.1 standard and the comparison of annual energy consumption between ASHRAE baseline model and proposed model is carried out. Moreover, an energy efficiency model is built based on the design model. In this model, shading performance of the transparent envelopes and operating performance of the building system components are improved. Meanwhile, other ECMs (energy saving measures) such as daylighting dimming and occupant sensors are considered. The simulation results show 4.7% electricity consumption decrease but 6.9% gas consumption increase of the energy efficiency model compared to ASHRAE baseline model. In summary, the annual energy cost of the energy efficiency model is reduced by 7.75%.