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Energy and exergy performance comparison of different HFC/R1234yf mixtures in vapor-compression cycles

  • Lihao HuangEmail author
Article
  • 19 Downloads

Abstract

To increase the COP and volumetric capacity of hydrofluoroolefins while reducing the global warming potential (GWP) of hydrofluorocarbons (HFCs), four HFC/R1234yf mixtures with various compositions are compared with verified thermodynamic models. Results show that a lower R1234yf mass fraction leads to a higher mixture latent heat; R32/R1234yf has the highest pressures, the lowest pressure ratios and the biggest temperature glides. As the R1234yf mass fraction increases from 0.0 to 1.0, the cooling coefficient of performance (COP) first increases from 5.25 to 5.52 and later decreases to 5.30 for R32/R1234yf, while it decreases from 5.46, 5.63 and 5.30 to 5.29 for R134a/R1234yf, R152a/R1234yf and R161/R1234yf. The heating COP first increases from 3.90 to 4.00 and later decreases to 3.79 for R32/R1234yf, while it decreases from 3.84, 3.95 and 4.02–3.79 for others. Caused by different volumetric capacities, R32/R1234yf requires a compressor enlarged by 2.8 times, R134a/R1234yf and R152a/R1234yf requires little change on compressor size, while R161/R1234yf requires a compressor enlarged by 1.5 times. R32/R1234yf yields the highest discharge temperature, while R134a/R1234yf yields the lowest. R32/R1234yf shows the highest exergy COPs (ECOPs) when the R1234yf mass fraction is above 60% in cooling mode and 46% in heating mode. Otherwise, R152a/R1234yf performs the best in cooling model and R161/R1234yf performs the best in heating mode. Considering both GWP and efficiency, the optimal composition is 20/80% for R32/R1234yf, 10/90% for R134a/R1234yf and 100/0% for both R152a/R1234yf and R161/R1234yf. This study provides suggestions for the determination of optimal compositions of different HFC/R1234yf mixture refrigerants.

Keywords

Low-GWP Hydrofluoroolefin Hydrofluorocarbons Mixture refrigerant Vapor-compression cycle Exergy efficiency 

List of symbols

H

Specific enthalpy, kJ kg−1

\(\dot{m}\)

Mass flow rate, kg s−1

pc

Condensing pressure, kPa

pe

Evaporating pressure, kPa

Qc

Heating capacity of condenser, kW

Qe

Cooling capacity of evaporator, kW

qc

Cooling volumetric capacity, MJ m−3

qh

Heating volumetric capacity, MJ m−3

Tc

Condensing temperature, °C

Te

Evaporating temperature, °C

T0

Reference temperature, °C

\(\dot{V}\)

Volumetric flow rate, m3 s−1

Wp

Power of compressor, kW

x

Mass fraction

ηi

Isentropic efficiency

ρ

Density, kg m−3

ΔHlv

Latent heat, kJ kg−1

Abbreviations

COP

Coefficient of performance

ECOP

Exergy coefficient of performance

GWP

Global warming potential

HCFC

Hydrochlorofluorocarbons

HFC

Hydrofluorocarbon

HFO

Hydrofluoroolefin

ODP

Ozone depletion potential

p–h

Pressure–enthalpy

R22

Chlorodifluoromethane

R32

Difluoromethane

R125

Pentafluoroethane

R134a

1,1,1,2-Tetrafluoroethane

R152a

1,1-Difluoroethane

R161

Fluoroethane

R410A

Mixture of difluoromethane and pentafluoroethane

R1234yf

2,3,3,3-Tetrafluoropropene

R1234ze(E)

Trans-1,3,3,3-tetrafluoropropene

T-s

Temperature–entropy

VLE

Vapor–liquid equilibrium

Notes

Acknowledgements

The supports from “Shanghai key laboratory of multiphase flow and heat transfer for power engineering” (13DZ2260900), PhD Start-up Funding (1D-16-301-007) and Shanghai Municipal Education Commission Funding (10-17-301-803) are greatly acknowledged.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Institute of Refrigeration and Cryogenics, University of Shanghai for Science and TechnologyShanghaiPeople’s Republic of China

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