A novel multi-dimensional performance evaluation method for IES based on decomposition and synthesis of marginal exergoeconomic cost coefficients

Accurate evaluation of techno-economics serves as the foundation for the planning, scheduling and operational optimization of integrated energy systems (IES). However, existing studies on IES performance evaluation conduct single or selective assessments of energy efficiency, exergy efficiency, economics and other factors. They fail to capture the correlations among different evaluation indicators simultaneously under a unified benchmark, thus not achieving a multi-dimensional unified benchmark evaluation for IES. Meanwhile, all evaluation indicators are system-oriented, and an equipment-system integrated evaluation has not been accomplished. To address these issues, this paper proposes a novel multi-dimensional evaluation method for IES based on the decomposition and synthesis of marginal exergoeconomic cost coefficients. From the marginal exergoeconomic cost coefficients, the marginal irreversible exergoeconomic cost coefficients of equipment are decomposed, which realizes the quantitative characterization of techno-economic inequivalent irreversible losses in IES under a unified benchmark and reveals the influence mechanism of equipment performance degradation in IES on the formation of exergy flow exergoeconomic costs. A synthesis method for the comprehensive exergoeconomic cost coefficients of cooling/heating/electricity products in IES is proposed, which uncovers the distribution and formation process of exergoeconomic cost flows during their transmission in the energy network. Based on the analysis and comparison of typical cases, it is verified that the proposed method can characterize the techno-economic characteristics of heterogeneous exergy flows of IES accurately.