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Exergy-based efficient ecological-function optimization for endoreversible Carnot refrigerators
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DOI：10.1515/jnet-2024-0099.png)
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Abstract
En 中文
Based on the definition of exergy-based efficient ecological-function (EEF) proposed in the existing literature, which is the product of energy conversion coefficient-of-performance (epsilon) and exergy-based ecological-function (E), this paper will introduce the exergy-based EEF into performance optimization for Carnot refrigerator cycle. Via endoreversible Carnot refrigerator model established in previous literature, expression of the exergy-based EEF of refrigerator is derived based on finite-time thermodynamic theory, relationships of dimensionless exergy-based EEF versus epsilon and cooling load (R) are studied, and performance differences of refrigerator cycles at the maximum exergy-based EEF, at the maximum E, and at the maximum efficient cooling-load conditions are compared. The results demonstrate that relationships of dimensionless exergy-based EEF versus R and epsilon are parabolic-like ones; in actual design, the refrigerator should be designed at the larger R and epsilon points. When exergy-based EEF is taken as optimization-objective, although R decreases slightly, epsilon is increased, and entropy-generation-rate (sigma) is greatly decreased, so exergy-based EEF does not only reflect the compromise between the R and sigma, but also reflect the compromise between the R and epsilon.
Keywords:
endoreversible Carnot refrigerator
finite-time thermodynamics
ecological-function
performance comparison
comparative performance
exergy-based efficient ecological-function
Journal
J
IF:
4.2
Papers:
767
Citations:
941