Abstract
Compressed air energy storage (CAES) is an economic, large-scale energy storage technology, but its further applications are limited by thermodynamic inefficiency. Although high-exergy destruction components can be highlighted through exergy analysis, the interactions among components and the true potential for the improvement of CAES are not obvious. In this study, an advanced exergy analysis was applied to the CAES system. The exergy destruction within each system component was split into four parts, namely, endogenous, exogenous, avoidable, and unavoidable. The thermodynamic properties of CAES were discussed in detail by combining the four parts. Results indicate that the unavoidable part of exergy destruction within the components of the system is larger than the avoidable part. The most important components based on the avoidable exergy destruction are combustion chambers, intercoolers, and aftercoolers. Exergy destruction can be significantly reduced by improving the main component efficiencies. More than half of the avoidable exergy destruction is exogenous, which indicates that interactions among components have a considerable impact on the CAES performance.
Highlights
Renewable energy sources exhibit remarkable and uncontrollable intermittency during power production
The thermodynamic data of real, theoretical, unavoidable, and hybrid conditions are provided in Tables VII–IX; TOT stands for the overall system
Advanced exergy analysis splits the exergy destruction within each component into endogenous/exogenous and avoidable/unavoidable parts, which can help facilitate the subsequent optimization of the overall system
Summary
Renewable energy sources (e.g., solar and wind energy) exhibit remarkable and uncontrollable intermittency during power production. Advanced exergetic analysis has been applied to many types of energy conservation systems, such as a tri-generation system with a diesel gas engine operating in a refrigerator plant building, a gas engine heat pump for food drying processes, a novel system for generating electricity and vaporizing liquefied natural gas, supercritical power plant, and absorption refrigeration machines.. Advanced exergetic analysis has been applied to many types of energy conservation systems, such as a tri-generation system with a diesel gas engine operating in a refrigerator plant building, a gas engine heat pump for food drying processes, a novel system for generating electricity and vaporizing liquefied natural gas, supercritical power plant, and absorption refrigeration machines.22 The results of these applications show that the interactions among components and the energy saving potentials need to be considered to effectively improve energy conservation systems.
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