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Effect of h-BN solid nanolubricant on the performance of R134a–polyolester oil-based vapour compression refrigeration system

  • R. HarichandranEmail author
  • P. Paulraj
  • S. Maha Pon Raja
  • J. Kalyana Raman
Technical Paper
  • 24 Downloads

Abstract

The interest in the use of hexagonal boron nitride (h-BN) nanoparticles as solid nanolubricant for R134a–polyolester oil-based vapour compression refrigeration system was arisen because of its self-lubricating property, thermal and chemical stability. The present investigation analyzes the consequence of different volume concentrations of h-BN solid nanolubricant in the polyolester oil-based lubricant, on its density, viscosity and tribological aspects, as well as on the coefficient of performance of a vapour compression refrigeration system using R134a (1,1,1,2-tetrafluoroethane) refrigerant as the working fluid. Different samples of nanolubricants were prepared based on the volume percentage of h-BN nanoparticles using magnetic stir, low-intensity ultrasonic bath and high-intensity ultrasonic stirrer method. The tribological test results reveal that there is a momentous enhancement in antifriction behaviour in the nanolubricant compared to base polyolester oil. The nanolubricant containing 3 vol% h-BN nanoparticles shows a sixty percentage improvement in the energy saving as compared to base POE oil system.

Keywords

Refrigeration h-BN nanoparticles Nanolubricant characteristics Performance of the system 

List of symbols

Cp

Specific heat capacity (kJ kg−1 K−1)

Dp

Nanoparticle diameter (m)

K

Energy meter constant (Imp kW−1 h−1)

m

Mass of water (kg)

mh-BN

Mass of h-BN nanoparticles

mbf

Mass of polyolester oil

n

Number of pulses taken in energy meter

P

Work power input (kW)

Q

Refrigerant capacity (kW)

t

Time (s)

T

Absolute fluid temperature (K)

Tr

T/273.15 K

T

Temperature difference (K)

x

Mass fraction

Abbreviations

COP

Coefficient of performance

HFC

Hydrofluorocarbon

POE

Polyolester

PAG

Polyalkylene glycol

SEM

Scanning electron microscope

UV

Ultraviolet

VCR

Vapour compression refrigeration

Greek symbols

ρh-BN

Density of h-BN nanoparticles

ρbf

Density of polyolester oil

\(\varPhi\)

Volume concentration

v

Liquid kinematic viscosity (mm2 s−1)

Subscripts

ex

Experimental

L

Pure lubricant

m

Mixture measured

np

h-BN nanoparticles

Notes

Acknowledgements

The authors are grateful to the Dr. M. A. Neelakandan, Professor, Department of Chemistry, National Engineering College, for providing the research laboratory facilities. One of the authors, Dr. R. Harichandran, acknowledges the Advanced Engineering Materials Laboratory, Department of Mechanical Engineering, National Engineering College, K.R. Nagar, Kovilpatti, Tamilnadu, India, for providing research laboratory facilities.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Engineering CollegeKovilpattiIndia

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