Abstract
ABSTRACT Thermal efficiency of parabolic solar trough collectors (PTCs) can be enhanced by dispersing TiO2 nanoparticles into the conventionally used heat transfer fluids. In the present experimental work, a one-dimensional mathematical model is designed to study the outcome of TiO2 nanoparticles dispersed in the base fluid for variable temperatures PTCs. The major finding of this work is that the TiO2 nanofluid enhances the thermal efficiency of the PTC slightly. Elevated working temperatures are most appropriate for nanofluids using to generate highest gain of energy discharged. It is found that the Exergetic effectiveness enhancement is most important than energetic effectiveness. The maximum exergy efficiency is achieved by TiO2 based nanofluid and is about 8.09%. The highest relative gain of thermal energy discharged is found to be 9.66% higher than the water-based collector by using 0.3% of TiO2 in the base fluid.
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