IRJET- Experimental Investigation of Pipe in Pipe Tube Heat Exchanger using Sio2 Nanofluid

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1436
Experimental Investigation of Pipe in Pipe Tube Heat Exchanger Using
Sio2 Nanofluid
Akash A.Dhobale1, Dr.J.A.Hole2
1ME student, Department of Mechanical Engineering, JSPM’s NTC narhe, Maharashtra, India.
2Professor, Department of Mechanical Engineering, JSPM’s Tathawade , Maharashtra, India.
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Abstract - Pipe in pipe tube heat exchanger system was
design and constructed to investigate the behavior of the
nanofluid SiO2 with respect to the base fluid. Heat transfer
characteristicswere measured. Experimental setupconsists
of outer M.S pipe, inner aluminum pipe, SiO2 nanofluid with
2% vol concentreat ,100nm size and water is a base fluid.
Based on results heat transfer characteristics of the
nanofluid improve the performance of the heat exchanger.
By adding the nanopartical in the base fluid which increases
the heat transfer characteristics and results in larger the
heat transfer coefficient as compare to base fluid. In this
paper we see the how nanofluid affects in the heat transfer.
Key Words: heat transfer characteristics, Nanofluid, pipe in
pipe tube heat exchanger, Effectiveness .
1. INTRODUCTION
Pipe in pipe tube heat exchanger is a mechanicaldevice,used
to transfer of heat between two fluids at different
temperatures. This types of heat exchanger widely used in
industries. Now a day for heat transfer enhancement,
nanofluid is used. The first time nanofluid was defined in
1995, when Choi, working in a research project at Argonne
National Laboratory. Nanofluid is the mixture of
nanopartical and base fluid. Nanopartical have the highly
thermal conductivity, so it increasesthe thermal propertyof
the base fluid (water or glycol). This exchanger used in food
industries, petroleum industries, oil industries, thermal
power plant and chemical industriesetc. For increasingheat
exchanger performance now a day’s nanofluidiswidelyused
in heat transfer devices. Now companies trying to find high
heat transfer in compact heat exchanger. So by using
nanofluid with variousconcentrationswillincreasestheheat
transfer rate at compact heat exchanger. So nanofluid is
helpful for designing the heat exchanger which transfers
more heat in compact size as compare to conventional heat
heat exchanger. In this pipe in pipe tube heatexchangerSiO2
nanofluid with 100nm size at 2% vol. concentration is used.
1.1 Materials Selection
By studying the research, the many different nanofluid is
used in heat exchanger like CuO, Al2O3 , ZnO etc. Base fluid
mostly used for preparation of the nanofluid are water ,
ethylene glycol , engine oil etc. from the above studywehave
select the pipe in pipe tube heat exchanger with SiO2
nanofluid.
Table -1: Thermal properties of water and SiO2 nanofluid
Table -2: Material Specification
2. EXPERIMENTAL SETUP
Fig -1: Line diagram of the setup
The pipe in pipe tube heat Exchanger consists of two pipes.
Outer pipe made up of M.S having outer diameter 76.2mm
and inner diameter 74.2 mm and 1m long. Inner pipe made
up of aluminum having inner diameter 23.4mm and outer
diameter 25.4mm and 1050mm long. On the inletofonepipe
valve is provided to open and close alternatively for parallel
and counter flow operation. Two tanks are used for store
cold and hot fluid. Two pumps is used for pumping the fluid
Sr. No. Property water SiO2
1 density(Kg/m3) 998 2220
2 Specific Heat (J/kg-k) 4187 745
3 Thermal conductivity (W/m.K) 0.58 1.4
4 Viscosity (Pa.s) 0.0019 -

in the heat exchanger it pump maximum 10.lpm of fluid.
2500 W one immersion heater is used, to heat the fluid. For
flow measuring one rota meter is used to measure the cold
fluid flow. Four K type thermocouple is used for measuring
temperature of the inlet and outlet of the both fluids. For
temperature indicating digital temperatureindicatorisused.
Fig -1: Experimental setup
2.1 Analysis of pipe in pipe tube Heat Exchanger
The analysis of the heat exchanger as following [7]:
i) Hot fluid heat transfer rate Qh = mh×Cph×(Thi – Tho )
ii) Cold fluid heat transfer rate Qc = mc×Cpc×(TCo – TCi )
Where (Thi, Tho) is the inlet and outlet temperature of the
hot fluid. And (TCi, TCo ) is the inlet and outlet temperatureof
the cold fluid. mhand mC is the mass flow rate of hot andcold
fluid.
Qavg =
iii) Effectiveness of the Heat Exchanger
Ɛ =
iv) Density of nanofluid calculated
𝜌nf = (1- φ) ×𝜌bf + φ𝜌p
v) Specific heat of the nanofluid
Where 𝜌nf, Cpnf is the density and specific heat of the
nanofluid respectively. Φ is the weight concentration of the
of the nanopartical in volume of the base fluid.Cpnp and Cpbf is
the specific heat of the nanopartical and base fluid
respectively.
3. RESULTS AND DISCUSSION
In order to study of pipe in pipe tube heat exchanger, the
nanopartical increase the thermo physical properties of the
base fluid. By using nanofluid we will increase the heat
transfer characteristicsof the exchanger. Nanofluidgivesthe
good result than water. Also the increases or decreases of
the mass flow rate, is affect on heat transfer rate.
Table -3: Observation table
Results are shown in graphical forms, as they following:
Chart -1: Time vs. temperature difference
It is the combine graph of water vs. SiO2 nanofluid. This
graph clearly shows that the difference between nanofluid
and water. In this we see that time increases at specific
interval there is increasesthe temperature difference.Sowe
see that as compare to water nanofluid gives more
temperature difference.

Chart -2: Mass flow rate vs. temperature difference
Chart 2. Shows that comparison between mass flow rate vs.
temperature difference of the water and nanofluid.
Nanofluids have more thermal conductivitythanwater.That
means it will conduct more heat than water. In the graph we
see that if we decrease the mass flow rate of the nanofluidor
cold water there is increases the temperature difference of
the heat exchanger. Means that if we vary the flow of the
fluid there is affect on the outlet temperature of the heat
exchanger.
Chart -3: Mass flow rate vs. Effectiveness
The chart shows that the effectiveness of the water and
nanofluid. And we see the combine result of the mass flow
rate vs. effectiveness of the heat exchanger of water and
nanofluid. Effectiveness of the heat exchanger is dependson
temperature difference of the hot water and temperature
difference of the inlet hot and inlet nanofluid fluid. So as we
discus above if we vary the mass flow rate there is also vary
the temperature difference of the hot water and nanofluid.
Means that if we vary or reduce the mass flow rate of the
working fluid, there is vary or increase the effectiveness of
the heat exchanger. Effectiveness of the heat exchanger
should be lies in between 0 to 1
Chart -4: Time vs. average heat transfer rate
The chart 4 shows that water and nanofluid combine result
of time vs. average heat transfer rate. Heat transfer rate of
the heat exchanger isdepends on the temperaturedifference
of the fluid. So chart 4 shows that if we increases the time at
a specific interval there is increases theaverageheattransfer
tare of the heat exchanger.
Chart -5: Mass flow rate vs average heat transfer rate
It is seen that effect of mass flow rate on average heat
transfer rate of the heat exchanger. From chart 5 we see as
we decrease the mass flow rate, there is average heat
transfer rate of the nanofluid increases.
3. CONCLUSIONS
Heat transfer rate is directly proportional to Reynolds
number. Pressure drop increases with increase in volume
concentration. Spherical shaped nano-material give better
heat transfer rate than other shapes. From the Experimental
investigation we observed that thermal conductivity of the
nanofluid is greater than water.
Inlet Temperature of the hot and cold fluid willalsoaffecton
the heat transfer rate. Also by varying the mass flow rate we
can control the heat transfer rate and effectiveness of the
heat exchanger. Increasing the time is also increasestheheat
transfer rate. By using SiO2 nanofluid asa cooling fluid inthe
pipe in pipe tube heat exchanger Effectiveness of the heat
exchanger increased by 23.10% as compare to the water.

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IRJET- Experimental Investigation of Pipe in Pipe Tube Heat Exchanger using Sio2 Nanofluid

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