PARAMETRIC EVALUATION OF THERMOPHYSICAL PROPERTIES FOR A MIXED REFRIGERANT … · 2017-07-30 ·...

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International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 7, July 2017, pp. 1246–1251, Article ID: IJMET_08_07_135

Available online at http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=8&IType=7

ISSN Print: 0976-6340 and ISSN Online: 0976-6359

© IAEME Publication Scopus Indexed

PARAMETRIC EVALUATION OF

THERMOPHYSICAL PROPERTIES FOR A

MIXED REFRIGERANT OF PROPANE AND

ISO-BUTANE IN INDUSTRIAL APPLICATIONS

Seepana PraveenKumar

Research Scholar, Lovely Professional University, Punjab, India.

Raja Sekhar Dondapati

Associate Professor, Lovely Professional University, Punjab, India.

Preeti Rao Usurumarti

Assistant Professor, P.V.K. Institute of Technology, Andhra Pradesh, India.

Priyanka Anand

Research Scholar, Lovely Professional University, Punjab, India.

ABSTRACT

Mixed Refrigerant have emerged researchers during the past decades due to its

superior thermophysical properties such as thermal Conductivity, density, viscosity

and specific heat. In the present work, two base fluids such as propane (R290)and

ISO-butane (R600a)are mixed at different compositions by its molecular weight

composition. The analyses are carried out under operating conditions temperature

ranges from(300-350K) and pressure ranges is operated from (3MPa-7MPa)are

considered in order to analyse the properties such like thermal conductivity, viscosity,

density, and specific heat by using National Institute of Standards and

Technology(NIST) Super trapp. In the present context, results that variation of

thermophysical properties operated at pressure from 3MPa to 7Mpa at different

compositions.

Key words: Base fluids, Thermal conductivity, Density, Viscosity, Specific heat,

Thermophysical.

Cite this Article: Seepana PraveenKumar, Raja Sekhar Dondapati, Preeti Rao

Usurumarti and Priyanka Anand Parametric Evaluation of Thermophysical Properties

for A Mixed Refrigerant of Propane and ISO-Butane in Industrial Applications.

International Journal of Mechanical Engineering and Technology, 8(7), 2017, pp.

1246–1251.

http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=8&IType=7

Parametric Evaluation of Thermophysical Properties for A Mixed Refrigerant of Propane and

ISO-Butane in Industrial Applications


1. INTRODUCTION

In the past few decades, advancements in the Nanotechnology led to a new generation of

fluids called mixed refrigerant which are widely used in various applications such as domestic

refrigeration system, industrial refrigeration system, air conditioning system, heat exchangers,

diesel generators for the purpose of coolant, etc. [1]–[4].The study of mixed refrigerant was

first performed by Choi [5], in which he compared the thermal conductivities of mixed

refrigerant with various heat transfer fluids. With the advancement in technologies, industries

around the world strongly need to enhance the thermal conductivity by developing the

advanced fluids for better heat transfer. Therefore, in the present work, thermal

conductivity, density, viscosity and heat transfer as the function of temperature is analyzed at

various compositions of propane and ISO-butane. In the present study 10gms of refrigerant

mixture of propane and ISO-butane are considered at different compositions. The analysis is

carried at pressure at 3MPa-7MPa where the liquid phaseis formed at a temperature of 300-

350K. The concept of evaluating thermophysical properties of a mixed refrigerant carried out

by Abdolbaqi[6], [7]studied that behavior of thermal conductivity, density, viscosity and

specific heat at different

compositions.

Figure 1 Schematic Diagram of VCRS System

2. METHODOLOGY

In this present research work, mixed refrigerant Propane (R290) and ISO-butane(R600a) are

selected that are used in the vapour compression refrigeration system. Thermophysical

properties such as thermal conductivity, Viscosity, density and specific of propane and ISO-

butane are evaluated at different compositions of10-90%, 20-80%, 30-70%,40-60%, 50-50%,

60-40%,70-30%,80-20%,and 90-10%.Thepropertiesofthemixed refrigerants are as follow.

Seepana PraveenKumar, Raja Sekhar Dondapati, Preeti Rao Usurumarti and Priyanka Anand


Table 1 Represents properties of propane and ISO-butane

R290 R600a

IUPAC Propane ISO-butane

Chemical Formula C3H8 C4H10

Density 2.0098 kg/m3 2.51 kg/m3

MeltingPoint -187.7 -159.42

BoilingPoint -42.25 -11.7

Vapour Pressure 853.16 204.8

Specific Heat Capacity 73.6 96.65

SaturatedHydrocarbon Alkane Alkane

ODP 0 0

GWP 3.3 3

Cp/Cv 1.136 1.006

Critical Temperature 96.7 134.7

Critical Pressure 4248 3640

3. EXPERIMENTAL RESULTS

Investigation of thermophysical properties such as thermal conductivity, density, viscosity and

specific heat at a temperature(300-350K) and pressure of (3MPa-7MPa) on a mixed

refrigerant. Further, results have been obtained with respect to temperature at different

composition of are frigerant mixture. From the Figure1, Figure2, Figure3, Figure4, Figure5 we

can reveal that thermal conductivity, density, viscosity decreases with increase in temperature.

Moreover, as the increase in temperature specific heat is also increases.

Figure 2 a) Thermal conductivity of base fluid b) Density c) Viscosity d) Specific heat as a function of

temperature at pressure of 3MPa




Figure 2 reveals that variation of thermophysical properties with respect to different

temperatures. It is observed as the temperature increases thermal conductivity, specific heat,

viscosity decreases at pressure 3MPa. Moreover, it is also observed specific heat increases

with increase in temperature at pressure 3MPa.

Figure 3 a) Thermal conductivity b)Density of mixed refrigerant c) Viscosity d) Specific heat as a

function of temperature at pressureof4MPa

Figure 3 represents that thermal conductivity, density, viscosity, specific heat with respect

to temperatures. It is observed, that as the thermal conductivity, density, viscosity decreases

with increases in temperature at different compositions at 4MPa. Moreover, it is also observed

that as the specific heat increases with increase in temperature at different composition for

mixed refrigerant

Figure 4 a) Thermal conductivity b) Density c) Viscosity of base fluid d) Specific heat as a function of


Seepana PraveenKumar, Raja Sekhar Dondapati, Preeti Rao Usurumarti and Priyanka Anand


Figure 4 shows that variation of thermo physical properties at different compositions with

respect to temperature. Moreover, it is observed that at pressure 5MPa thermal conductivity,

viscosity, density decreases and specific increases for a mixed refrigerants.

Figure 5 a) Thermal conductivity b)Density c) Viscosity d) Specific heat of base fluid as a function of


Figure 5represents that thermal conductivity, density, viscosity, specific heat with respect

to temperatures. It is observed, that as the thermal conductivity, density, viscosity decreases

with increases in temperature at different compositions at 6MPa. Moreover, it is also observed

that as the specific heat increases with increase in temperature at different composition for

mixed refrigerant

Figure 6 a) Thermal conductivity b)Density c) Viscosity d) Specific heat as a function of temperature

at pressure of 7MPa

Figure 6reveals that variation of thermophysical properties with respect to different

temperatures. It is observed as the temperature increases thermal conductivity, specific heat,




viscosity decreases at pressure 3MPa. Moreover, it is also observed specific heat increases

with increase in temperature at pressure 3MPa.

4. CONCLUSION

The present work was carried out in National Institute of Standard Technology (NIST®) for

inspecting the Thermophysical properties of Propane(R290) and ISO-butane(R600a) at a

temperature of 300-350K and pressure of 3MPa to 7MPa. In addition, results are calculated

for density, viscosity, thermal conductivity and Specific heat for a mixed refrigerant the

results shows that as the temperature increases thermal conductivity, viscosity and density are

decreases. Moreover, as in increases in temperature specific heat is also increased at different

pressures of a refrigerant mixture at different compositions.

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PARAMETRIC EVALUATION OF THERMOPHYSICAL PROPERTIES FOR A MIXED REFRIGERANT … · 2017-07-30 ·...

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