“…Meanwhile, there are also many attempts that have been made for application of nanofluid, especially in energy systems [8–11]. Due to the enhancement in heat and mass transfer process, TiO 2 nanofluids have been tentatively applied to the fields of solar collectors [12], refrigeration [13–16], energy storage [17, 18], heat pipes [19–21], and other energy applications [22–34], such as car radiator [31], PV/T hybrid system [32, 33], and combined heat and power (CHP) systems [34]. In our previous studies, the heat transfer characteristics of TiO 2 nanofluids in heat conduction, forced convection boiling heat transfer, and natural convection heat transfer have been summarized [35].…”