Study on Energy Saving and Low Carbon Renovation of Ultra Low Energy Buildings in Severe Cold Regions

Abstract Under the general environment of environmentally friendly and low carbon development and the construction industry transformation, China’s building carbon emissions in 2020 accounted for 51 per cent of the total number of carbon emissions, of which is the building operation stage accounted for 22 per cent of the total carbon emissions, and the share and trend of energy consumption are consistent with the situation of carbon emissions. Ultra-low-energy buildings have long been widely recognised as energy efficient and ecological buildings. This paper takes the project of the renovation of a complex building in primary school in Shenyang in severe cold regions as a research object, analyses the difference in energy consumption and carbon emissions between the renovated building and the original building in the operation phase, and explores the energy-saving and low carbon potentials of ultra-low-energy buildings compared with traditional buildings. Calculations based on actual cases, the renovated buildings for energy consumption is 21.66kWh/m 2 and carbon emissions from renovated building is 15.88kgCO 2 /m 2 , while the original buildings for energy consumption is 58.94kWh/m 2 and the carbon emission of the original building is 43.22kgCO 2 /m 2 at the building’s operational stage. The renovated building has remarkable energy efficient and low carbon potential compared to the original building.