Optimized design of existing building based on energy-saving and low-carbon — A case study of the 4th canteen of Chongqing University

This article gives a canteen of Chongqing University as an example, proposes that we should pay attention to the potential capability of existing building, integrating tightly the energy saving strategies with the building. It concerns the nature light, ventilation, rain collection and integrated utilization of energy, searching the feasibilities of passive-energy's using in existing building.