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http://www.iaeme.com/IJMET/index.asp 1246 editor@iaeme.com
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
http://www.iaeme.com/IJMET/index.asp 1247 editor@iaeme.com
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
http://www.iaeme.com/IJMET/index.asp 1248 editor@iaeme.com
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
Parametric Evaluation of Thermophysical Properties for A Mixed Refrigerant of Propane and
ISO-Butane in Industrial Applications
http://www.iaeme.com/IJMET/index.asp 1249 editor@iaeme.com
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
temperature at pressure of 5MPa
Seepana PraveenKumar, Raja Sekhar Dondapati, Preeti Rao Usurumarti and Priyanka Anand
http://www.iaeme.com/IJMET/index.asp 1250 editor@iaeme.com
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
temperature at pressure of 6MPa
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,
Parametric Evaluation of Thermophysical Properties for A Mixed Refrigerant of Propane and
ISO-Butane in Industrial Applications
http://www.iaeme.com/IJMET/index.asp 1251 editor@iaeme.com
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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