A Marginal Contribution Theory-Based Energy Efficiency Contribution Analysis for Integrated Energy System

The energy efficiency analysis is a prerequisite for the construction of the integrated energy system (IES). In this study, a novel energy efficiency analysis method is proposed considering different energy subsystems in the IES. First, the energy efficiency index of the subsystems and conversion devices is formed for elaborating their influence on the IES. The IES is composed of four energy subsystems, i.e., power/gas/heat/cooling subsystems, and six energy conversion devices. Next, the energy efficiency contribution models of energy subsystems and conversion devices are proposed based on their energy efficiency index, respectively. Then, in order to calculate the energy flow in the IES, an equivalent topological model of the IES weighted directed graph is proposed to calculate the energy efficiency contribution. Finally, an actual park is employed to illustrate the validity of the proposed analysis method.

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An Energy Efficiency Index Formation and Analysis of Integrated Energy System Based on Exergy Efficiency

Frontiers in Energy Research ◽

10.3389/fenrg.2021.723647 ◽

2021 ◽

Vol 9 ◽

Author(s):

Huiling Su ◽

Qifeng Huang ◽

Zhongdong Wang

Keyword(s):

Energy Efficiency ◽

Evaluation Model ◽

Second Law Of Thermodynamics ◽

Energy System ◽

Efficiency Index ◽

Exergy Efficiency ◽

Energy Utilization ◽

Utilization Efficiency ◽

Efficiency Evaluation ◽

Integrated Energy System

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.

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Energy efficiency analysis method based on fuzzy DEA cross-model for ethylene production systems in chemical industry

Energy ◽

10.1016/j.energy.2015.02.078 ◽

2015 ◽

Vol 83 ◽

pp. 685-695 ◽

Cited By ~ 82

Author(s):

Yongming Han ◽

Zhiqiang Geng ◽

Qunxiong Zhu ◽

Yixin Qu

Keyword(s):

Energy Efficiency ◽

Chemical Industry ◽

Ethylene Production ◽

Production Systems ◽

Efficiency Analysis ◽

Analysis Method ◽

Cross Model ◽

Fuzzy Dea ◽

Energy Efficiency Analysis

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Energy Flow Chart-Based Energy Efficiency Analysis of a Range-Extended Electric Bus

Mathematical Problems in Engineering ◽

10.1155/2014/972139 ◽

2014 ◽

Vol 2014 ◽

pp. 1-12 ◽

Cited By ~ 5

Author(s):

Xiaogang Wu ◽

Chen Hu ◽

Jingfu Chen

Keyword(s):

Energy Efficiency ◽

Energy Flow ◽

Management Strategies ◽

Efficiency Analysis ◽

Flow Chart ◽

Evaluation Indexes ◽

Auxiliary Power ◽

Electric Bus ◽

Northern Chinese ◽

Energy Efficiency Analysis

This paper puts forward an energy flow chart analysis method for a range-extended electric bus. This method uses dissipation and cycle energy, recycle efficiency, and fuel-traction efficiency as evaluation indexes. In powertrain energy efficiency analysis, the range-extended electric bus is developed by Tsinghua University, the driving cycle based on that of Harbin, a northern Chinese city. The CD-CS and blended methods are applied in energy management strategies. Analysis results show with average daily range of 200 km, auxiliary power of 10 kW, CD-CS strategy, recycle ability and fuel-traction efficiency are higher. The input-recycled efficiency using the blended strategy is 24.73% higher than CD-CS strategy, while the output-recycled efficiency when using the blended strategy is 7.83% lower than CD-CS strategy.

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Integrated Energy System Optimization Based on Standardized Matrix Modeling Method

Applied Sciences ◽

10.3390/app8122372 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2372 ◽

Cited By ~ 7

Author(s):

Jingchao Li ◽

Yulong Ying ◽

Xingdan Lou ◽

Juanjuan Fan ◽

Yunlongyu Chen ◽

...

Keyword(s):

Energy Flow ◽

Nonlinear Problems ◽

System Optimization ◽

Energy System ◽

Optimization Method ◽

Modeling Method ◽

Matrix Modeling ◽

System Components ◽

Integrated Energy System ◽

Energy Conversion Devices

Aiming at the optimization of an integrated energy system, a standardized matrix modeling method and optimization method for an integrated energy system is proposed. Firstly, from the perspective of system engineering, the energy flow between energy conversion devices is used as a state variable to deal with nonlinear problems caused by the introduction of scheduling factors, and a standardized matrix model of the integrated energy system is constructed. Secondly, based on the proposed model, the structural optimization (i.e., energy flow structure and equipment type), design optimization (i.e., equipment capacity and quantity), and operation optimization for the integrated energy system can be achieved. The simulation case studies have shown that the proposed integrated energy system standardized matrix modeling method and optimization method are both simple and efficient, and can be effectively used to decide the system components and their interconnections, and the technical characteristics and daily operating strategy of the system components.

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