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>Solar radiation and temperature graphs for Al<sub>2</sub>O<sub>3</sub>-water nanofluid.</div>

International Journal of Photoenergy

Figure 9: 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 