کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1734052 | 1016150 | 2011 | 12 صفحه PDF | دانلود رایگان |
In this paper, two new CO2 cascade refrigeration cycles are proposed and analyzed. In both these cycles the top cycle is an ejector-expansion transcritical cycle and the bottom cycle is a sub-critical CO2 cycle. In one of these proposed cycles the waste heat from the gas cooler is utilized to drive a supercritical CO2 power cycle making the plant a combination of three cycles. Using the first and second laws of thermodynamics, theoretical analyses on the performance characteristics of the cycles are carried out. Also a parametric study is conducted to optimize the performance of each cycle under various operating conditions. The proposed cycles exhibit a reasonable value of COP (coefficient of performance) with a much less value of compressor discharge temperature, compared to the conventional cycles.
► Two new high performance configurations of ejector-expansion TRCC (transcritical CO2) cascade refrigeration cycles using constant-area mixing model were presented.
► A parametric study was also conducted to optimize the performance of plant under various operating conditions.
► The range of increase in COP (coefficient of performance) values of Layouts 1 and 2 is about 10.8–31.5%.
Journal: Energy - Volume 36, Issue 12, December 2011, Pages 6839–6850