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>Schematic diagram of a basic heat pipe [<a href="/journals/ijp/2021/5546508/#B37">37</a>].</div>

International Journal of Photoenergy

Figure 2: 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 