Abstract
In the context of the energy crisis and environmental deterioration, the integrated energy system (IES) based on multi-energy complementarity and cascaded utilization of energy is considered as an effective way to solve these problems. Due to the different energy forms and the various characteristics in the IES, the coupling relationships among various energy forms are complicated which enlarges the difficulty of energy efficiency evaluation of the IES. In order to flexibly analyze the energy efficiency of the IES, an operation efficiency evaluation model for the IES is established. First, energy utilization efficiency (EUE) and exergy efficiency (EXE) are proposed based on the first/second law of thermodynamics. Second, the energy efficiency models for five processes and four subsystems of the IES are formed. Lastly, an actual commercial-industrial park with integrated energy is employed to validate the proposed method.
Highlights
The high-efficient utilization of clean energy received widespread attention and the energy internet and the integrated energy system (IES) has set off a wave of global energy systems reform (Meibom et al, 2013; Mancarella, 2014)
By comparing the energy efficiency of IES in winter and summer, it can be seen that the energy efficiency in summer is better than that in winter because of the higher energy efficiency level of energy production process (EPP) and energy transmission process (ETP) in summer
It was found after analysis that there is a relationship between the energy utilization efficiency (EUE) and the exergy efficiency (EXE)
Summary
The high-efficient utilization of clean energy received widespread attention and the energy internet and the IES has set off a wave of global energy systems reform (Meibom et al, 2013; Mancarella, 2014). In order to improve the economy and environmental protection of systems, IES can coordinate the multi-energy allocation, improve energy efficiency, and offer high-quality energy services by energy cascaded utilization. IES is made up of energy production process (EPP), energy transmission process (ETP), energy conversion process (ECP), energy storage process (ESP), and energy utilization process (EUP). These processes can affect the energy efficiency and function of the IES.
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