Whole Building Energy Simulation and Energy Saving Potential Analysis of a Large Public Building Using EnergyPlus

By comparing EnergyPlus with other energy simulation tools, it 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 (Heating Ventilation and Air Conditioning), lighting and domestic hot water systems. Energy consumption and cost of a large public building were simulated and calculated for LEED certification using EnergyPlus. ASHRAE baseline model was constructed according to ASHRAE 90.1 standard and the comparison of annual energy consumption between ASHRAE baseline model and proposed model was carried out. Moreover, an energy saving model was built based on the proposed model, in which the shading performance of the transparent envelopes and operating performance of the building system components were improved. Meanwhile, other energy saving measures such as daylighting dimming and occupant sensor were considered. The simulation results show 4.7% electricity consumption decrease but 6.9% gas consumption increase of the energy saving model compared to ASHRAE baseline model. In summary, the annual energy cost of the energy saving model is reduced by 7.75%.