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Performance Investigation of a Nanofluid-Based Parabolic Trough Solar Collector

  • Devander KumarEmail author
  • Sheela Kumari
Conference paper
  • 466 Downloads
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

The present study is performed with the aim to investigate the simple methods of performance enhancement of parabolic trough collector (PTC). Nanofluid proposes exclusive advantages over conventional fluids due to their unique physical properties. In this manuscript, the thermal performance of PTC integrated with the storage tank is investigated experimentally using 0.0 and 0.1 wt% nanofluids based on the multi-walled carbon nanotube (MWCNT) particles. A nanofluid based on the MWCNT particles using triple deionized water as a base fluid is prepared and used as the working fluid in addition to the water for performance investigation. The performance has been evaluated in terms of useful heat gain, collector thermal efficiency, rise in water temperature within the storage tank, charging, and overall efficiency of system. Experimental results showed that the performance of the collector is improved using nanofluid as a working fluid in comparison to the water and average gain in thermal efficiency is achieved to be about 3% higher with nanofluid. The maximum charging efficiency of the system is found to be 62 and 59% with MWCNT nanofluid and water, respectively.

Keywords

MWCNT nanofluid Parabolic trough collector Thermal efficiency Charging and overall efficiency 

Nomenclature

.

\( A_{\text{a}} \)

Aperture area (m2)

\( C_{\text{pf}} \)

Specific heat of flowing fluid at mean temperature (J/kg K)

\( C_{{{\text{p}},{\text{bf}}}} \)

Specific heat of base fluid (J/kg K)

\( C_{{{\text{p}},{\text{nf}}}} \)

Specific heat of nanofluid (J/kg K)

\( C_{{{\text{p}},{\text{np}}}} \)

Specific heat of nanoparticles (J/kg K)

\( C_{{{\text{p}},{\text{st}}}} \)

Specific heat of stored fluid (J/kg K)

\( D_{\text{ai}} \)

Inner diameter of absorber (m)

\( D_{\text{ao}} \)

Outer diameter of absorber (m)

\( D_{\text{ci}} \)

Inner diameter of glass cover (m)

\( D_{\text{co}} \)

Outer diameter of glass cover (m)

\( E_{\text{co}} \)

Collected energy (J)

\( E_{\text{st}} \)

Stored energy (J)

F

Focal length (m)

H

Height of inner storage tank (m)

I

Solar beam radiation on aperture plane of PTC (W/m2)

L

Collector length (m)

Lsr

Supporting rod length (m)

\( \dot{m} \)

Mass flow rate of working fluid (kg/s)

m

Stored mass of fluid within the storage tank (kg)

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

Useful energy extracted (W)

\( S_{\text{a}} \)

Arc length of parabola (m)

\( T_{\text{fi}} \)

Inlet temperature of fluid (°C)

\( T_{\text{fo}} \)

Exit temperature of fluid (°C)

ΔT

Temperature difference between exit and inlet of receiver (°C)

\( T_{\text{st}} \)

Fluid temperature in storage tank (°C)

\( w_{\text{I}} \)

Error in solar beam irradiance (%)

\( w_{\text{m}} \)

Error in mass flow rate (%)

\( w_{\Delta T} \)

Error in temperature rise in the receiver (%)

\( w_{\eta } \)

Error in thermal efficiency of collector (%)

\( W_{\text{a}} \)

Aperture width (m)

x

Half of aperture width (m)

X

Height of thermocouples from base of inner storage tank (m)

Y

Depth of parabola from focal axis (m)

Subscripts

k

At any instant time

\( k + 1 \)

One hour period after kth time

I

Inner

O

Outer

Greek Symbols

\( \phi_{\text{r}} \)

Rim angle (°) chosen as 90°

\( \eta_{\text{I}} \)

Instantaneous thermal efficiency

\( \eta_{\text{ch}} \)

Charging efficiency

\( \eta_{\text{ov}} \)

Overall efficiency

Фbr

Ball bearing diameter (m)

Фic

Inner collar diameter (m)

Фoc

Outer collar diameter (m)

Фsr

Supporting rod diameter (m)

φ

Volume fraction of nanoparticles in nanofluid

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Oil and Natural Gas Corporation Ltd.AhmedabadIndia
  2. 2.Indian Institute of TechnologyRoorkeeIndia

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