Abstract
Analysis of the function of urban energy metabolic system is an important research subject under the policy of energy saving. We developed an ecological network model for the system, and used Beijing city as an example of how this approach provides insights into the flows within the system. The basic components of the model are energy exploitation, energy transformation, energy consumption, and energy recovery. Beijing's energy metabolic system in 1995, 2000, 2005 and 2007 were analyzed by this approach as examples. Network utility analysis was applied to analyze the complex relationships between the components within the system. Using the sign distribution in the network utility matrix, we determined the relationships between each pair of the system's components. Some of the energy metabolic relationships between sectors were the same in the four years, whereas others were different. The ecological relationships between the energy transformation and exploitation sectors, between the energy consumption and transformation sectors, and between the energy consumption and exploitation sectors were the same, but the ecological relationships between the energy recovery and other three sectors differed greatly. Using ecological network analysis to evaluate the structure of urban energy metabolic system provided sound suggestions for adjusting the relationships between components.
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