Influence of energy saving measures of office building envelope on energy consumption of air conditioning system and economic analysis

Based on a five-story office building in Tianjin, establishes the energy consumption model with eQUEST software. Simulates and calculates the cooling, heating and annual energy consumption by changing the parameters of building envelope. Analyses the influence of energy saving measures, including increasing insulation layer thickness of outdoor wall and roof and changing external window type, on the energy consumption of air conditioning system and the economic benefits. The result of single factor sensitivity analysis indicates that the energy saving potential and economic benefits of the three measures of changing external window type, increasing insulation layer thickness of outdoor wall and increasing insulation layer thickness of roof are decreasing in turn.