Abstract
This paper studied the retrofit project of an existing office building in Beijing to meet the requirements of nearly zero energy buildings. The office building is the first retrofit nearly zero energy building project in China. There are technical difficulties under the constraints of the building and resources. In order to study the technical solutions applicable to the project, we analyzed the suitability of different energy-saving technologies based on the resources and characteristics of the project. Then we obtained the key energy-saving factors. This paper also discussed the energy saving effects of different energy efficiency technology solutions, proposing an optimized nearly zero energy technology solution and verifying the energy-saving level of the optimized plan. Compared with normal new constructions complied with national energy efficiency standard, the energy efficiency of this retrofit building increased by 60%.
Highlights
Energy conservation is among the most critical issues faced by the sustainable development of human societies
Nearly zero energy building (NZEB) requires 60% energy saving compared with normal new constructions complied with national energy efficiency standard in China
The retrofit goal of existing office building is to meet the requirements of NZEB (60% energy-saving compared with new constructions complied with national energy efficiency standard in China)
Summary
Energy conservation is among the most critical issues faced by the sustainable development of human societies. Buildings account for over 40% of end-use energy in the world 1 .With the economic development, the energy consumption of office buildings is growing increasingly in China. Zero energy building (NZEB) is the major development target of many counties in the short to medium term, due to the technical and economical rationality. NZEB requires 60% energy saving compared with normal new constructions complied with national energy efficiency standard in China. There is no nearly zero energy retrofit projects of existing buildings in China. The office building is the first retrofit nearly zero energy building project in China. The retrofit goal of existing office building is to meet the requirements of NZEB (60% energy-saving compared with new constructions complied with national energy efficiency standard in China).
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