Abstract
The structure of an integrated energy system is complex. Thermoeconomics can play a significant role in the analysis of IES because it makes up for the deficiency of traditional thermodynamic analysis and provides new information on the cost and energy conversion efficiency. When using thermoeconomics to analyze the energy efficiency of an IES, one key issue that needs to be solved is how to transfer irreversible loss across thermal cycles, so that the mechanism of system performance degradation can be fully revealed. To this end, an irreversible cost and exergy cost integrated analysis method based on improved thermoeconomics is proposed, in which the cumulative and transmission impact of irreversible loss across thermal cycles is evaluated using linear transformation of <KP> matrix. A case study on a 389MW combined cooling, heating, and power IES demonstrates the effectiveness of the proposed approach. The proposed approach can reveal the key links impairing the overall energy efficiency and transfer of irreversible loss across thermal cycles. The approach can be extended to various types of IES to provide directions for the assessment and optimization of the system.
Highlights
An integrated energy system (IES) is a new energy system based on advanced technology and management modes to achieve a complementary and cascading utilization of multiple types of energy [1,2,3,4]
Ghaffarpour et al [21] carried out an exergy analysis and exergy economic analysis of a new type of power generation system in which biomass is combusted with coal and calculated the impact of different operating parameters on the exergy efficiency and exergy cost of the system; the results show that the fuel mass flow rate and current density are the dominant factors affecting the variation in energy and exergy efficiencies as well as unit production cost
This paper proposes an irreversible cost and exergy cost integrated analysis method for IESs based on improved thermoeconomics, in which linear transformation of the matrix is applied to unify the process irreversible loss and the exergy cost of the system together
Summary
An integrated energy system (IES) is a new energy system based on advanced technology and management modes to achieve a complementary and cascading utilization of multiple types of energy [1,2,3,4]. Based on exergy economic structure theory and exergy cost theory, this paper will present a production structure diagram construction method and exergy cost modeling method for IESs, carry out linear transformation on the matrix, and reveal the transmission characteristics of irreversible loss in an IES and the formation process of multiple product exergy costs in the system. The exergy economic analysis method is applied to analyze the performance degradation process of an IES; For an IES, an integrated model for calculation of exergy costs and irreversible loss costs based on the classification of exergy flow attributes is proposed; Linear transformation of the matrix is carried out to obtain the relationship between process irreversible losses and exergy costs for an IES.
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