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Thermodynamic Analysis of Various Refrigerants for Automotive Air Conditioning System

  • Tauseef Aized
  • Ameer Hamza
Research Article - Mechanical Engineering
  • 12 Downloads

Abstract

This study investigates numerically the thermodynamic analysis of various refrigerants on the basis of vapor compression refrigeration cycle. The refrigerants studied are R134a, R152a, R1234yf, R404A, R407C, R410A and R507A. The aim of this research is to find the alternative refrigerant of R134a numerically. EES Professional V9.944-3D is used in the modeling of thermodynamic cycle of VCRC and calculating the performance parameters of VCRC. The comparison of thermodynamic VCRC for all the refrigerants is made. The performance parameters include: cooling capacity, input power of compressor, COP, compression ratio and discharge temperature. These parameters are calculated at engine speeds of 1000 rpm, 2000 rpm and 3000 rpm, condenser temperature of \(50\,^{\circ }\hbox {C}\) and evaporator temperature of \(5\,^{\circ }\hbox {C}\). The compressor volumetric efficiencies are taken as 0.75, 0.65 and 0.55 corresponding to engine speeds of 1000 rpm, 2000 rpm and 3000 rpm. The results of performance parameters for all refrigerants studied are exported to MATLAB R2017a software where the comparative analysis is performed. Results show that R152a is the only refrigerant which can be used as alternative in current AACS with minimum modification. The cooling capacity of R152a is slightly less than that of R134a, while its COP is found to be higher than that of R134a. R152a shows the highest COP improvement of 5.33% at engine speed of 1000 rpm. It has very low GWP and almost same saturation pressure corresponding to condenser and evaporator temperature as that of R134a, so it can serve as alternative refrigerant in current AACS.

Keywords

Automotive air conditioning system Alternative refrigerants R134a Global warming potential Performance Vapor compression refrigeration cycle EES software 

Abbreviations

AACS

Automotive air conditioning system

VCRC

Vapor compression refrigeration cycle

ODP

Ozone depletion potential

HFCs

Hydrofluorocarbons

CFCs

Chlorofluorocarbons

CR

Compression ratio

rpm

Revolutions per minute

DFT

Default reference state in EES software

NBP

Normal boiling point

EES

Engineering equation solver

COP

Coefficient of performance

GWP

Global warming potential

HFOs

Hydrofluoroolefins

ASH

Reference state for ASHRAE

IIR

International Institute of Refrigeration

List of symbols

\(\rho \)

Density of refrigerant

s

Specific entropy of refrigerant

\(\eta \)

Isentropic efficiency of compressor

\(Q_{\text {evap}}\)

Evaporator cooling capacity

\(P_{\text {comp},\mathrm{R134a}}\)

Compressor input power for R134a

\(Q_{\text {evap,imp}}\)

Improvement in evaporator cooling capacity

\({\text {COP}}_{\text {imp}}\)

Improvement in coefficient of performance

\(\dot{m}\)

Mass flow rate of refrigerant

h

Specific enthalpy of refrigerant

\(P_{\text {comp}}\)

Compressor input power

\(\eta _\mathrm{v}\)

Volumetric efficiency of compressor

\(Q_{\text {evap,R134a}}\)

Evaporator cooling capacity for R134a

\({\text {COP}}_\mathrm{R134a}\)

Coefficient of performance for R134a

\(P_{\text {comp,imp}}\)

Improvement in compressor input power

P

Saturation pressure

N

Engine speed

\(D_{\text {comp}}\)

Compressor displacement

Additional subscripts

s

Isentropic process

\(1, 2, 3, \ldots \)

State points on property diagram

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Faculty of Mechanical EngineeringUniversity of Engineering and Technology, LahoreLahorePakistan

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