A Review on the Various Solutions to Improve the Performance of the Solar Collector Absorber Tube by Using Turbulator and Hybrid Nanofluid

Document Type : Original Article

Authors
Seyede Mohadeseh Miri
Farhad Vahidinia
Assistant Professor, Department of Mechanical Engineering, Faculty of Engineering, University of Zabol, Zabol, Iran.
10.22034/stme.2024.466713.1065
Abstract
The absorber tube is the main part of the solar collectors which its appearance and operational characteristic can play key role in absorbing of solar irradiation amounts. Researchers have proposed various offers to improve the solar collector performance such as inserting a turbulator in the absorber tube and using of nanofluid (especially hybrid nanofluids) instead of simple working fluid. In present study, the various shapes of turbulators proposed by the researchers have been reviewed. Turbulators can be classified according to their shapes. In the first category, turbulency in fluid flow is made by providing ribs or corrugations on the inner wall of absorber tube. But in the second category, external obstacles can be inserted in the absorber tube to improve its performance. Most literatures disscused about the second category of turbulators. By comparing the hydrothermal performance between the smooth absorber tubes with the improved one, it can be concluded that addition of turbulator enhances the thermal properties of all collector types up to 82%.  The turbulators can increase the pressure drop and friction factor due to its operation as an obstacle in the fluid flow. Also, the use of nanofluids (especially hybrid nanofluids) beside the turbulators can improve the collector’s performance. However, several characteristics such as the concentration of nano particles, different kinds of hybrid nano fluid and collectors, the various shapes of the turbulator, etc., are all effective parameters on the collector performance.
Keywords
Solar collector
improvement performance of absorber tube
turbulator
hybrid nanofluid
energy optimization
Subjects
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  • Receive Date 07 July 2024
  • Revise Date 26 October 2024
  • Accept Date 06 November 2024
  • First Publish Date 06 November 2024
  • Publish Date 21 September 2024