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Energetic and exergetic performance comparison of cascade refrigeration system using R170-R161 and R41-R404A as refrigerant pairs

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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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Correspondence to Bijan Kumar Mandal.

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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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