Abstract
Various kinds of refrigeration cycles and the effect of various design parameters are reviewed in this paper. A simple vapor compression absorption cycle provides cooling at low temperature up to -50 °C but cannot produce cooling and heating effect simultaneously, whereas this limitation overcome by cascading two vapor compression cycle to produce both cooling and heating effect simultaneously by taking CO2 as a refrigerant in the high-temperature side and other refrigerants in the low-temperature side which provides a larger cooling range as compared to the conventional cycle. An EES computer program was built to investigate the properties of some blends such as R744/125, R744/41, and R744/32, and the effect of subcooling, superheating, and approach temperature was calculated. The effect of some design parameters, such as evaporator temperature and isentropic efficiency of the compressor, is analyzed, and results show that the COP of the cycle increases with an increase in evaporative temperature but decreases with increasing condenser temperature. The isentropic efficiency of the compressor has little effect on system performances. A transcritical cycle can give heating effect above the critical temperature which makes the cycle more efficient as compared to the subcritical cycle. Furthermore, cycle performances of both subcritical and transcritical cycles can improve by using a two-phase ejector as a replacement of the throttle valve. The effect of various design parameters of the ejector to increase system performance is also discussed moreover for large-scale industrial applications of ejector-enhanced refrigeration cycle.
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Abbreviations
- AT:
-
Approach temperature
- COP:
-
Coefficient of performance
- DT:
-
Heat exchanger temperature difference
- ε :
-
Heat exchanger effectiveness
- h :
-
Enthalpy
- HT cycle:
-
Higher temperature cycle
- IT:
-
Intermediate temperature
- LT Cycle:
-
Lower temperature
- mL, mH:
-
Mass transfer in low and high-temperature cycles respectively (kg)
- ŋ c :
-
Isentropic efficiency of compressor
- OT:
-
Overlap temperature
- Q H :
-
Heat transfer in higher temperature cycle (kJ)
- Q L :
-
Heat transfer in lower temperature cycle (kJ)
- T C :
-
Condenser Temperature
- T E :
-
Evaporative temperature
- T H :
-
Temperature of heat sink fluid
- T L :
-
Temperature of heat source fluid
- W T :
-
Total work done by the compressor
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Kumar, S., Chahal, V. (2021). A Review of Various Kinds of Cascade Refrigeration Cycle and Application of Ejector Mechanism. In: Pandey, C., Goyat, V., Goel, S. (eds) Advances in Materials and Mechanical Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0673-1_20
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DOI: https://doi.org/10.1007/978-981-16-0673-1_20
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