Comparative Study on Energy Saving Effect of Energy Efficiency Retrofit of Existing Residential Buildings in Cold Area

In this paper, two residential demonstration projects are selected to analyze the energy saving effect of EER of existing residential buildings in cold area China case of China. Based on the theory of building energy consumption, calculation data of two cases of actual testing data, compared with the actual effect of energy saving by building energy consumption indexes of EER projects to sum up the energy conservation contribution of EER technical measures in cold area. The important findings are: a) the energy-saving reconstruction of existing buildings in the cold area of China can bring significant energy saving and emission reduction effects; b) the energy saving distribution of the external wall retrofit of the inefficient buildings in the cold area takes up the largest part of energy saving by building envelope, and the second is the EER of external windows; c) the energy saving EER of existing building envelope must synchronize with the indoor heating system retrofit and heating metering and charging system, otherwise, the phenomenon of “energy-efficient building do not save energy” will happen.