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Performance investigation of ice plant working with R134a and different concentrations of POE/TiO2 nanolubricant using experimental method

  • Shailendra Singh ChauhanEmail author
  • Ritesh Kumar
  • S. P. S. Rajput
Technical Paper
  • 40 Downloads

Abstract

This paper experimentally investigates the performance of an ice plant test rig for varied volume concentrations (0.1%, 0.2% and 0.3%) of TiO2 nanoparticles dispersed in polyol ester (POE) lubricating oil using R134a as a working refrigerant. The performance of the test rig is investigated on the basis of parameters including brine temperature in the brine tank (pull-down time), pressure ratio, compressor power input, freezing capacity, COP, thermal conductivity, viscosity, and density at suction and discharge end of compressor. Analysis is based on temperature and pressure readings taken using suitable thermocouples and gauges fitted to the test rig. Refrigerant properties are acquired using REFPROP 9.1 software development by NIST. The concentration of 0.2% is found as the optimum since the lowest compressor power input and the highest COP are achieved at this concentration. The result indicates that the mixture of R134a/nanolubricant (POE/TiO2) worked safely and efficiently in the rig, and the performance is found better than operated with mixture of R134a/lubricant (POE), with 15.8% less power consumption in the compressor and 29.1% increase in the COP at 0.2% volume concentration of TiO2 nanoparticles. Moreover, thermal conductivity, viscosity, and density of the mixture of R134a/nanolubricant (POE/TiO2) are found higher compared to mixture of R134a/lubricant (POE) and are increasing with increasing the TiO2 concentration.

Keywords

TiO2 concentration POE R134a Coefficient of performance Compressor power input Nanolubricant 

List of symbols

Cp

Specific heat (kJ kg−1 K−1)

h

Specific enthalpy (kJ kg−1)

k

Thermal conductivity (Wm−1K−1)

m

Mass (kg)

\( \dot{m} \)

Mass flow rate (kg s−1)

P

Pressure (bar)

\( \dot{Q}_{{\text{f}}} \)

Freezing capacity (kW)

T

Temperature (°C)

v

Specific volume (m3 kg)

Win

Compressor power input (kW)

ρ

Density (kg m−3)

µ

Dynamic viscosity (m Pa-s)

ϕ

Nanoparticle volume concentration (%)

nm

Nanometre

COP

Coefficient of performance

CNT

Carbon nanotube

HFC

Hydrofluorocarbon

HP

High pressure

LP

Low pressure

MO

Mineral oil

MWh

Mega watt hour

POE

Polyol ester

PAG

Polyalkylene glycol

TiO2

Titanium dioxide

TR

Tons of refrigeration

VCRS

Vapour compression refrigeration system

Subscript

1

Compressor inlet

2

Compressor outlet

3

Condenser outlet

4

Evaporator inlet

r

Refrigerant

b

Brine

avg

Average

dis

Discharge

suc

Suction

Notes

Acknowledgements

Authors appreciate the support given by Amity Institute of Technology, Amity University Uttar Pradesh, Noida (U.P.), and Maulana Azad National institute of technology, Bhopal (M.P.).

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  • Shailendra Singh Chauhan
    • 1
    Email author
  • Ritesh Kumar
    • 2
  • S. P. S. Rajput
    • 3
  1. 1.Amity Institute of TechnologyAmity University Uttar PradeshNoidaIndia
  2. 2.Department of Mechanical EngineeringGovernment Engineering CollegeJhalawarIndia
  3. 3.Department of Mechanical EngineeringMaulana Azad National Institute of TechnologyBhopalIndia

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