Thermal performance enhancement in a parabolic trough receiver tube with internal toroidal rings: A numerical investigation

[Display omitted] •A novel parabolic trough receiver with toroidal rings is examined numerically.•Thermally efficient absorber exhibits a higher thermal efficiency of 69.32%.•Nu for the optimal absorber cases is 2.33 and 1.49 times higher than SAT.•Heat loss for the thermally efficient case is lower...

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