Numerical Simulation of a Parabolic Through Solar Collector with a Novel Geometric Design Equipped with an Elliptical Absorber Tube Under the Influence of Magnetic Field

Abstract

The primary basis of the present study is the design of a new geometry of the parabolic through solar collector in order to achieve maximum thermal efficiency. Most of the absorber tubes used in solar system have a circular cross section. In this study, the cross section of the PTSC absorber tube is modeled as elliptical. Also, in this study, in order to make thermal properties more practical, DWCNT and GO nanoparticles were dispersed in Syltherm 800 base fluid. Syltherm 800 heat transfer oil is used as a condensing HT oil up to the highest temperature, because this BF has low viscosity and high thermal stability. Also, using this BF in TS prevents sedimentation and pollution. An innovative combined turbulator has been used to change the shape of flow lines to create turbulence in the path of the absorber tube. In addition, in the final stage of elliptical absorber tube, in the middle part where ICT is located, it is affected by the magnetic field, and different values of Hartmann number are checked on it. The obtained numerical results state that the most trend of changes in the average Nusselt number in EAT is due to the presence of ICT in the hybrid nanofluid flow path. However, in the next step, the most changes that can be seen in the \({\text{Nu}}_{{{\text{ave}}}}\) are due to the increase in the transverse ratio of ICT. Based on the results, it can be stated that the use of the MF in higher Ha has a significant effect on the hydrodynamic performance of the SS of the present study and increases the value of the PEC index to some extent compared to lower Ha. Also, based on the results, the Ha = 150 has the highest exergy efficiency \((\eta_{{{\text{ex}}}} )\) values in all the investigated Re ranges. After that, Ha = 100 and 50 are in successive positions. The highest exergy efficiency in the absence of a magnetic field occurs at a Reynolds number of 10,000, a volume fraction of 4%, and for ξ = 12 mm, which is around 55%. The lowest exergy efficiency with change of Hartmann number occurs at Reynolds number of 60,000, volume fraction of 4%, PR = 2, and in ξ = 12 mm.