Study on Energy Saving Retrofitting Strategies for Existing Public Buildings in Shanghai

Public buildings include office building, schools, hotels, hospitals, retails and others. This paper selects two types of existing public buildings — office and hotel to conduct research. It firstly introduces and analyzes the feasible energy saving retrofitting strategies and technologies for existing public buildings in Shanghai, mainly about building envelope, HVAC system and lighting system. Then it builds up prototypical models, with whole building energy analysis software—EnergyPlus, for office and hotel respectively to simulate and calculate the annual energy saving and payback period of the various strategies. Therefore the different features of the two types of buildings and the energy saving effects of various strategies used on them are studied. The results show that the energy saved by each one strategy may be different for different types of existing buildings. For office buildings, such ECMs (energy conservation measures) as external shading, energy efficient lighting system, daylighting in perimeter area and variable pumps have short payback period. While for hotels, external shading, variable pumps and temperature reset have short payback period.Copyright © 2009 by ASME