Research on the suitability technologies of existing public buildings in hot summer and cold winter zones based on energy consumption and economic coupling optimization

In the era of energy conservation and carbon reduction, simulations and analyses were carried out on three typical building types—office buildings, hotel buildings, and commercial buildings—in hot summer and cold winter zones, China, using Ladybug tools based on the Grasshopper platform. The energy consumption benefits and static payback periods for different retrofit technologies were compared. The results show that retrofitting a domestic hot water system is highly suitable for hotel buildings. Retrofitting the lift system is highly suitable for commercial buildings. A comprehensive evaluation of improving the thermal performance of the transparent building envelope, replacing lighting fixture, and improving the efficiency of chiller units shows good suitability for all three building types.