| 论文简介 |
This study proposes a modified dual-temperature CO2 transcritical refrigeration cycle, in which two cascade
ejectors are applied to enhance the performance of a dual-temperature refrigeration system. The
theoretical investigations with energetic and exergetic methods have been carried out, the results show
that the dual-ejector cycle exhibits higher coefficient of performance (COP) and system exergy efficiency
than that of the basic throttling refrigeration cycle and single ejector refrigeration cycle. In comparison
with the single ejector refrigeration cycle at the given operation conditions, the proposed system
improves the COP and exergy efficiency by 5.26–25.5% and 9.0–28.7%, and the pressure lift ratio of the
two cascade ejectors could be improved by 6.0–12.2%. The largest exergy destruction of the proposed
cycle occurs in the gas cooler, followed by the ejectors accounting for the 28.9% of the system exergy
destruction rate. The performance characteristics of the double ejector cycle show its potential advantages
in dual-temperature CO2 transcritical refrigeration systems. |
(创新港)
