Improvement of Heat Pipe Solar Collector Thermal Efficiency Using Al<sub>2</sub>O<sub>3</sub>/Water and TiO<sub>2</sub>/Water Nanofluids

<div>Efficiency chart for pure water, Al<sub>2</sub>O<sub>3</sub>-water, and TiO<sub>2</sub>-water nanofluids.</div>

International Journal of Photoenergy

Figure 11: Improvement of Heat Pipe Solar Collector Thermal Efficiency Using Al<sub>2</sub>O<sub>3</sub>/Water and TiO<sub>2</sub>/Water Nanofluids 