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Screening of HFCs and Fluoroethers as Alternatives to R134a Using SRK EoS

  • S. ParashuramaEmail author
  • D. K. Ramesha
  • M. S. Govindegowda
Original Contribution
  • 39 Downloads

Abstract

The volumetric and thermodynamic properties of fluorinated ethers such as trifluoromethyl-1-H-pentafluoroethylether, F-oxetane, 2-H-heptafluoropropane, pentafluorodimethylether, F-methyl methyl ether, perfluorodoxolane, pentafluorodimethoxymethane and HFCs such as trifluoroethane, heptafluoropropane, difluoroethane, pentafluoropropane, ethyl fluoride as alternatives to replace R134a have been predicted using SRK equation of state over the temperature range from − 25 °C to + 55 °C. Theoretical analysis is carried out using ten-point vapour compression cycle for screening of candidate refrigerants. The results of analysis have been used to ascertain standard refrigeration parameters in respect of each of the candidate refrigerants. The analysis indicates that the performances of difluoroethane, ethyl fluoride, pentafluorodimethylether and F-oxetane are better than that of R134a.

Keywords

Hydrofluorocarbons Fluorinated ethers Volumetric refrigeration capacity Discharge temperature Coefficient of performance Specific compressor work R134a 

List of symbols

C

Clearance factor and specific heat (kJ/kg °C)

COP

Coefficient of performance

GWP

Global warming potential

ODP

Ozone depletion potential

h

Enthalpy (kJ/kg)

M

Molecular weight (kg/kg mol)

\(\dot{m}\)

Mass flow rate, kg/s

n

Polytropic index

P

Pressure (bar)

Q0

Refrigerating effect (kJ/kg)

T

Temperature (K) and torque (N m)

V

Volume, cc (m3)

v

Specific volume (m3/kg)

W

Power input (W)

q

Refrigeration effect

Abbreviations

NBP

Normal boiling point (°C)

CFC

Chlorofluorocarbons

HFCs

Hydrofluorocarbons

HCFCs

Hydrochlorofluorocarbons

PFDME

Perfluorodimethyl ether

POE

Polyester oil

VP

Vapour pressure (bar)

VRC

Volumetric refrigerating capacity (kJ/m3)

SCD

Specific compressor displacement [(m3)/ton of refrigeration]

Greek symbols

γ

Specific heat ratio

η

Efficiency

Subscripts

c

Critical

fg

Vapourization

i

Inlet

is

Isentropic

k

Condenser

n

Polytropic

o

Evaporator

stg

Starting torque

v

Volumetric, vapour

0, 1, 2, etc.

State points

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Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  • S. Parashurama
    • 1
    Email author
  • D. K. Ramesha
    • 2
  • M. S. Govindegowda
    • 3
  1. 1.Department of Mechanical EngineeringJSSATEBangaloreIndia
  2. 2.Department of Mechanical EngineeringUVCEBangaloreIndia
  3. 3.Vivekananda College of Engineering and TechnologyPutturIndia

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