Performance and Exergy Analysis of Cryogenic Cycles
DOI:
https://doi.org/10.22399/ijcesen.5244Keywords:
Exergy, Refrigeration, Cryogenic cycles, PerformanceAbstract
This study examines and demonstrates the concepts of thermodynamics, exergy, and exergy analysis, and shows how these principles are applied to cryogenic cycles using equations. Furthermore, an energy, exergy, and performance analyses of the two-stage vapor compression cascade cryogenic cycle for natural gas liquefaction is conducted, and optimum operating conditions are presented in tables. Based on the data obtained from these equations, exergy analysis of cryogenic cycles was performed, and performance analysis and curves were plotted.
When the compressor outlet pressures of the first sub cycle is increased from 3300 kPa to 4590 kPa, the exergy loss of the devices decreases, the exergy efficiencies of the increases, and the COP values increase. When the cooling amount in heat exchangers 1 and 2 is increased from 9 °C to 17 °C, i.e., when cooling is increased, it leads to a slight improvement in the performance of the system. The optimum total compressor consumption according to inlet/outlet temperature difference in heat exchangers 1 and 2 are obtained at about 14-15 °C. When these two improvement methods are applied together, optimum performance values of the system are obtained. The COP value increases from 0.078 to 0.1164. The system is affected by the compressor outlet pressure of the first sub cycle. Increasing the cooling level from 9°C to 17°C in heat exchangers 1 and 2 has a minor impact on system performance.
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