Research on Large-Scale Building Energy Efficiency Retrofit Based on Energy Consumption Investigation and Energy-Saving Potential Analysis

As building energy consumption continues to grow, large-scale building energy efficiency retrofit (LSBEER) has become a trend in China, especially in existing commercial districts (ECDs). In some mature ECDs, buildings often have complex functions, long running time, and a lack of a basic database, so the whole energy consumption and level of energy efficiency are unclear. It is a challenging task to put forward the effective energy efficiency retrofit measures (ERMs) and quantify energy-saving potential. To overcome these obstacles, this paper introduces a bottom-up approach to analyze the potential of LSBEER. Meanwhile, it examines a case study of energy-saving potential of an ECD in Shanghai, with very specific problems targeting and corresponding to measurements. One hundred key buildings are studied in this paper, and the authors give a comprehensive understanding and quantitative analysis of energy-saving potential. Moreover, this paper also suggests a list of ERMs, including envelope, cooling, lighting, heating, elevator, and so on. Through investigation, the annual energy saving (AES) is 533,268 GJ, which could reduce energy consumption by 24.3%. Furthermore, the authors supply a feasible potential map of LSBEER for decision-makers. (C) 2019 American Society of Civil Engineers.