Thermal efficiency investigation of a ferrofluid-based cylindrical solar collector with a helical pipe receiver under the effect of magnetic field

This experimental study investigates the advantage of using Mn–Zn Fe2O4/water ferrofluid subjected to effect a non-uniform magnetic field on thermal efficiency fabricated cylindrical solar collector with receiver in shape helical pipe. Using ASHRAE Standard, this has investigated influence nanoparticles volume fraction (0.0–1.0%), mass flow rate fluid (0.00415–0.033 kg/s), and produced by set permanent magnets (Br = 0.0–1.2 T) collector' efficiency. The results show that for ferrofluid, overall is increased augmentation. For case 0.033 kg/s 1.0%, maximum enhancement compared water been 48.54%. positive applying predominates at lower rates higher fractions. In 0.00415 Br 1.2 T, collector's 26.8% without field.