| 论文简介 |
This paper presents a study on a modified ejector enhanced auto-cascade freezer cycle with conventional
thermodynamic and advanced exergy analysis methods. The energetic analysis shows that the modified
cycle exhibits better performance than the conventional auto-cascade freezer cycle, and the system COP
and volumetric refrigeration capacity could be improved by 19.93% and 28.42%. Furthermore, advanced
exergy analysis is adopted to better evaluate the performance of the proposed cycle. The exergy
destruction within a system component is split into endogenous/exogenous and unavoidable/avoidable
parts in the advanced exergy analysis. The results show that the compressor with the largest avoidable
endogenous exergy destruction has highest improvement priority, followed by the condenser, evaporator
and ejector, which is different from the conclusion obtained from the conventional exergy analysis. The
evaporator/condenser greatly affects the exogenous exergy destruction within the system components,
and the compressor has large impact on the exergy destruction within the condenser. Improving the
efficiencies of the compressor efficiency and the ejector could effectively reduce the corresponding
avoidable endogenous exergy destruction. The exergy destruction within the evaporator almost entirely
belongs to the endogenous part, and reducing the temperature difference at the evaporator is the main
approach of reducing its exergy destruction. |
(创新港)
