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


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.


Refrigeration h-BN nanoparticles Nanolubricant characteristics Performance of the system 

List of symbols


Specific heat capacity (kJ kg−1 K−1)


Nanoparticle diameter (m)


Energy meter constant (Imp kW−1 h−1)


Mass of water (kg)


Mass of h-BN nanoparticles


Mass of polyolester oil


Number of pulses taken in energy meter


Work power input (kW)


Refrigerant capacity (kW)


Time (s)


Absolute fluid temperature (K)


T/273.15 K


Temperature difference (K)


Mass fraction



Coefficient of performance






Polyalkylene glycol


Scanning electron microscope




Vapour compression refrigeration

Greek symbols


Density of h-BN nanoparticles


Density of polyolester oil


Volume concentration


Liquid kinematic viscosity (mm2 s−1)





Pure lubricant


Mixture measured


h-BN nanoparticles



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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