Abstract
A numerical study of cascade refrigeration system using two different refrigerant pairs, namely, R41–R404A and R170–R161 working under the same operating conditions has been presented in this paper. A computer code has been developed in Engineering Equation Solver software using the basic energy and exergy equations of cascade refrigeration system. Values of some of the important input parameters for the analysis have been taken from the literatures to carry out this simulation work. The effect of evaporator temperature on the basic performance parameters, such as COP, compressor power, total exergy destruction, exergetic efficiency has been computed. The analysis of the predicted results shows that for each evaporator temperature, an optimal point exists where the system shows maximum performance. An effective reduction of compressor work and total exergy loss is observed with R170–R161 system than those of the R41–R404A system. This eventually results in higher optimal COP as well as exergetic efficiency for R170–R161 system compared to R41–R404A system.
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Abbreviations
- COP:
-
Co-efficient of performance
- CRS:
-
Cascade refrigeration system
- GWP:
-
Global warming potential
- ODP:
-
Ozone depletion potential
- LTC:
-
Low temperature cycle
- HTC:
-
High temperature cycle
- Qeva :
-
Evaporator heat load in kW
- Qcas :
-
Cascade condenser heat load in kW
- Qcond :
-
Condenser heat load in kW
- WT :
-
Total compressor work in kW
- Wl :
-
Compressor work in LTC in kW
- Wh :
-
Compressor work in HTC in kW
- T0 :
-
Ambient temperature in °C
- Tcond :
-
Condenser temperature in °C
- Teva :
-
Evaporator temperature in °C
- THE :
-
Evaporator temperature in the HTC in °C
- TLC :
-
Condenser temperature in the LTC in °C
- ∆T:
-
Temperature difference in the cascade condenser in °C
- h:
-
Specific enthalpy in kJ/ kg
- s:
-
Specific entropy in kJ/ kg – K
- \( {\overset{\cdot }{\mathrm{m}}}_{\mathrm{l}} \) :
-
Mass flow rate in the LTC in kg/s
- \( {\overset{\cdot }{\mathrm{m}}}_{\mathrm{h}} \) :
-
Mass flow rate in the HTC in kg/s
- ηs :
-
Isentropic efficiency
- ηm :
-
Mechanical efficiency
- ηelec :
-
Electrical efficiency
- ηex :
-
Exergetic efficiency
- δ:
-
Percentage of exergy loss
- EX:
-
Exergy in kW
- ED:
-
Exergy destruction in kW
- 1, 2, 3, ..:
-
State points
- 0:
-
Ambient condition
- i:
-
Individual components
- eva:
-
Evaporator
- comp,l:
-
LTC compressor
- comp,h:
-
HTC compressor
- exp,l:
-
LTC expansion device
- exp,h:
-
HTC expansion device
- cas:
-
Cascade condenser
- cond:
-
Condenser
- HE:
-
Evaporator in HTC
- LC:
-
Condenser in LTC
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Acknowledgements
The first author acknowledges the support provided by the Thermal Simulation and Computation (TSC) Lab at Mechanical Engineering Department of IIEST, Shibpur for carrying out the research work.
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Roy, R., Mandal, B.K. Energetic and exergetic performance comparison of cascade refrigeration system using R170-R161 and R41-R404A as refrigerant pairs. Heat Mass Transfer 55, 723–731 (2019). https://doi.org/10.1007/s00231-018-2455-7
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DOI: https://doi.org/10.1007/s00231-018-2455-7