Design Method to Energy-saving Reconstruction for Existing Public Building in Northern Area of China

The energy consumption of per unit area in public building are larger than the residential building in China, and the energy-saving reconstruction for existing public building is less than the residential building at present, so it also have great potential and space of energy conservation. This paper based on the feature of climate and energy consumption of existing public building, formulated the evaluation principle of energy-saving reconstruction technology, put forward from economy, energy-saving effectiveness, advance and combination property of technology to determine the design method to energy-saving reconstruction, to select appropriate technology. At last, this paper through a case building---a teaching building in Xi'an to analysis how from specific problems to apply appropriate technologies in northern area.