Abstract
Buildings have a significant impact on global and local energy demand and climate change. Consequently, the issue of photovoltaic (PV) potential assessment of building roofs have been extensively studied. Although studies have adopted different methods to predict the various potentials of rooftop PVs, as yet there is no understanding of a comprehensive framework for evaluating the potential of rooftop PVs. This study aims to develop a new framework to evaluate the technical, economic, environmental, and social benefits of rooftop PVs in old communities in Nanjing. The study found that the total annual electricity generation of rooftop PVs in the two districts of Nanjing was 431,136,314 KWh, which can meet about 20% of the residential electricity demand in the study area; the total electricity generation in the life cycle of 25 years was 5327909814 KWh; The economic benefit was 4.06 yuan/wp; the CO2 emission efficiency was 20.02%; the social benefit was 11.224 yuan/KWh. The results of this study will potential provide valuable reference suggestions for urban planners from the perspective of the benefits brought by rooftop PV in the two districts.
Highlights
With the intensification of climate change and air pollution, many countries had adopted different response measures to reduce pollutant emissions and mitigate climate change [1]
The results showed that the estimated electricity generation of rooftop PV in 25 years was 5327909814 KWh
The electricity generation income of rooftop PV was 2814734755 yuan; the total daily maintenance cost of rooftop PVs was 132286148.9 yuan, and it can be calculated that the economic benefit per watt of rooftop PV was 4.06 yuan/wp
Summary
With the intensification of climate change and air pollution, many countries had adopted different response measures to reduce pollutant emissions and mitigate climate change [1]. In this process, the renewal and transformation of the city was important. As an important part of building energy saving and emission reduction, the potential assessment of rooftop PV affects energy planning and the feasibility of installing PVs. only by accurately predicting the potential of rooftop PV capacity can the actual value of rooftop PV applications in the buildings be effectively analyzed. There has been a lot of communities in Qinhuai and Gulou Districts of Nanjing City, analyzed the economic, environmental and social benefits to provide energy planners some certain basic suggestions
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