Nanofluids are the most attractive mean to enhance the performance of heat transfer devices. Several
types of nanoparticles were utilized as they have high thermal conductivity. Renewable energy makes
use of these nanofluids special in solar collectors. Evacuated tube solar collector is one of the most
utilized solar collectors in thermal applications. CeO2 nanoparticles were used in the presented study.
The mean diameter of CeO2 was 25 nm. A stable CeO2/water was made. The stability was checked using
Zeta potential machine. Experiments were carried out using three different volume concentration of
CeO2 nanoparticles of 0.015%, 0.025%, and 0.035%. The thermal performance of the evacuated tube solar
collector was examined at different mass flux rates. Results showed that the temperature difference
between inlet and outlet flow and absorbed energy increase when nanofluids are used. The volume
fraction flow rate of 0.035% at the mass flux rate of 0.017 kg/s.m2 had the maximum heat removable
factor, the thermo-optical characteristic of the collector, and the thermal loss coefficient. The thermooptical
characteristic of the collector of tube solar corrector is raised up to 34%.