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The utilization of conical strip inserts in a parabolic trough collector

  • Keyvan Amani
  • Mahdi Ebrahimpour
  • Sanaz Akbarzadeh
  • Mohammad Sadegh ValipourEmail author
Article
  • 6 Downloads

Abstract

During the last years, many studies have been performed in the field of parabolic trough collectors (PTCs) to achieve thermal performance enhancement. The use of turbulators can help to increase the fluid mixing and as a result, the decrease in wall temperature and risk of tube deformation. In this paper, the impact of conical strip inserts on the thermal performance of a PTC is numerically investigated. Reynolds number varies from 8000 to 40,000. Working fluid temperature at the inlet is 300 K. The results demonstrate that the Nusselt number increases up to 91.949%. Furthermore, the friction factor in the PTC with conical strip inserts is 5.21 more than the plain tube. Performance evaluation was used for analysing the benefits of this kind of turbulator. The overall thermal–hydraulic performance (PEC) varied from 1.107 to 0.679.

Keywords

Parabolic trough collector Thermal performance Conical strip inserts Nusselt number 

List of symbols

c1

Adjustable constant (–)

c2

Adjustable constant (–)

Cμ

Adjustable constant (–)

f

Friction factor (–)

k

Turbulent kinetic energy (m2 s−2)

Nu

Nusselt number (–)

Pr

Prandtl number (–)

D

The absorber tube diameter (m)

Re

Reynolds number (–)

T

Temperature (K)

u

Velocity (m/s)

W

Velocity in the z direction (m s−1)

Subscripts

c

corrugated

turb

turbulence

Greek symbols

ε

Turbulent kinetic energy (J kg−1 s−1)

µ

Dynamic viscosity (kg m−1 s−1)

ν

Kinematic viscosity (m2 s−1)

\(\Gamma\)

The equation of turbulence kinetic energy generation (–)

σk

Adjustable constant (–)

σz

Adjustable constant (–)

Abbreviations

CFD

Computational fluid dynamics

FVM

Finite volume method

MCRT

Monte Carlo ray tracing (MCRT)

PTC

Parabolic trough collector

PEC

Thermal performance factor

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2020

Authors and Affiliations

  1. 1.Faculty of Mechanical EngineeringSemnan UniversitySemnanIran

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