Application of Green Retrofitting Technology to Existing Office Buildings

Renovating and updating office buildings to green buildings is an important measure to solve environmental problems. As focusing on improving the green performance of existing office buildings in China, this research is to develop and establish a green retrofitting assessment framework for their renovation diagnosis and rehabilitation of the existing office buildings. Through literature reviews and expert interviews, the major indices and the factors of the indices in the initial green retrofitting assessment framework were determined. Afterward, the Delphi method was used to finalize the assessment framework with the data of the expert questionnaires. The final assessment framework consisted of five indices and seventeen factors. The five indices were energy conservation, water saving, waste reduction, physical environment, and ecological protection. To easily apply the assessment framework to the existing office buildings, a renovation diagnosis and rehabilitation scoring table were established by using an analytic hierarchical process (AHP) to determine the relative weights of the issues and the factors. Finally, the scoring table was applied to an existing office building in Fuzhou City, Fujian Province, China to investigate the retrofitting diagnosis problems and propose the retrofitting strategies using available engineering and technology.