Investigating the direct absorption planar collector with a central absorber tube for simultaneous surface and volume absorption and the effect of carbon nanofluid in improving thermal performance

Authors

1 Department of Mechanical engineering, Central Tehran Baranch, Islamic Azad University, Tehran, Iran

2 Assist. Prof., Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

3 Department of Mechanical Engineering, Islamic Azad University Central Tehran Branch, Tehran, Iran

Abstract

The purpose of this work is to investigate a different geometry in the parabolic collector in order to increase the thermal efficiency through simultaneous surface and volume absorption in a combined condition. Recently, it has been observed that if the inlet temperature is above 250 °C, Direct absorption collectors can increase efficiency up to 10% Considering that there is a direct relationship between the concentration of nanofluid and the diameter of the transparent tube carrying the fluid with the absorption coefficient, On the other hand, as the concentration of nanofluid increases, fluid sedimentation and system maintenance problems occur. In this research, the amount of nanocarbon used as a suspension of 0.02 gr/l in oil base fluid is considered. According to experimental data, this amount of nano carbon concentration completely absorbs light rays at a depth of 24 (mm) and this absorption coefficient has been used for this specific geometry of the collector. The results show that the rest of the radiation is absorbed on the surface using the central tube, so that the thermal efficiency is up to 6% compared to the usual copper absorption collector, which is about 19 degrees Kelvin.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 2
May and June 2024
Pages 65-76

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