Document Type : Research Article
Authors
1
Master of Science in Energy Systems, Faculty of Science and New Technologies, Semnan University, Semnan, Iran
2
Department of Automotive, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
3
Department of Thermal Engineering, Fluid Mechanics, and Energy Conversion, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
10.22060/mej.2026.24875.7906
Abstract
In the present research, to improve heat transfer in the parabolic solar collector, experiments were conducted using water and magnetic fluid as the working fluids at volume percentages of 2%, 2.5%, 3%, and 3.5% for the simple absorber tube and the absorber tube with a neodymium permanent magnet in turbulent flow, based on ASHRAE Standard 93. The thermal efficiency for water and magnetic fluid at volume percentages of 2%, 2.5%, 3%, and 3.5% was empirically measured and calculated for the simple tube at average Reynolds numbers of 5643, 12987, 13918, and 14845, yielding efficiencies of 50.6%, 55.0%, 60.5%, 65.29%, and 70.73%, respectively. Additionally, for the tube with a permanent magnet, the thermal efficiency for water and magnetic fluid at the same volume percentages was empirically measured and calculated at the same average Reynolds numbers, resulting in efficiencies of 52.94%, 57.69%, 62.79%, 68.01%, and 73.02%, respectively. As observed, with the increase in the volume percentage of the magnetic fluid, the thermal efficiency significantly increased. Furthermore, the creation of a magnetic field enhanced heat absorption, leading to an increase in the thermal efficiency of the parabolic solar collector system.
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