Abstract
The environmental and energy crisis has become a problem that can not be ignored in today’s world and improving the proportion of renewable energy utilization is an important way to alleviate the problem. China has begun to vigorously develop rooftop photovoltaic systems, and it is urgent to analyze the photovoltaic potential of the country. In this paper, GIS technology is used to calculate the available area of a PV system on the roof of urban buildings in China. The installed capacity and annual power generation of a PV system on the roof of urban buildings in China are further calculated, and the investment cost analysis of the buildings with a PV system is carried out. The results show that Chinese mainland city rooftop photovoltaic area has reached 3.35 billion m2. If urban roofs are used for photovoltaic power generation in China, the annual photovoltaic power generation capacity will be 672 billion kWh, which is about 61% of the total annual electricity consumption of the whole society in 2020. On the other hand, the initial investment in the construction of an urban photovoltaic system is large, but most of them can realize the return of investment in a short period of 8–10 years. Moreover, in the effective life of the follow-up photovoltaic system, it will bring greater economic benefits, which is more than two times the initial investment. To further promote the process of social carbon peak and carbon neutrality in China, the construction of an urban photovoltaic system is very feasible.
Highlights
According to the calculation of the United Nations Intergovernmental Panel on climate change (IPCC), in order to achieve the goal of 2 ◦C or even 1.5 ◦C temperature control stipulated in the Paris Agreement, the world must achieve carbon neutrality by 2050 [1]
Where, IPV is photovoltaic installed capacity, kW; G0 is solar irradiance under standard test conditions (STC), kW/m2; ηPV is photovoltaic module power generation efficiency, taking 0.1803; C0 is taking into account temperature changes, component pollution, The comprehensive coefficient of transmission loss, inverter efficiency, battery charge and discharge compensation and other factors, the comprehensive coefficient of this photovoltaic system is set to 75%
According to the previous article According to the statistical calculation results, the following conclusions can be obtained: The usable area of photovoltaic roofs of urban buildings in mainland China has reached 3.35 billion m2
Summary
According to the calculation of the United Nations Intergovernmental Panel on climate change (IPCC), in order to achieve the goal of 2 ◦C or even 1.5 ◦C temperature control stipulated in the Paris Agreement, the world must achieve carbon neutrality by 2050 [1]. The research calculates the application potential and economic value of roof photovoltaic in urban buildings in China. The calculation results can reflect the importance of the urban photovoltaic system for the construction of solar energy in China’s future goal of “carbon peaking and carbon neutralization”. From the overall situation of solar energy resources distribution in the Chinese mainland, the most abundant solar radiation area is located in the southwest and northwest of China. According to the above method, the solar radiation resources of various provinces and cities are obtained, as shown in
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