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انتروپی منفی
Table 1.5 shows five SLA approaches (exergy analysis, physical exergy analysis, exergy consumption analysis, negentropy analysis, and entropy analysis) and the required reference environment properties for each.
Consequently, it is meaningless to compare the results of exergy consumption, negentropy, and entropy analyses to those of energy analysis because, while exergy and negentropy can be consumed and entropy created, energy is conserved.
This is not the case for exergy consumption, negentropy, and entropy analyses, which only permit relative comparisons of the performances of different subprocesses.
As noted above, the SLAs that stem from the SLT can be categorized in order of decreasing comprehensiveness as follows (see Fig. 1.6): exergy, physical exergy, exergy consumption, negentropy, and entropy analyses.
Negentropy A quantity defined such that the negentropy consumption during a process is equal to the negative of the entropy creation.
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