The performance of solar evacuated thermal collector (SETC) was investigated by using water-based aluminum oxide (Al₂O₃) nanofluid and combination of Al₂O₃ and copper oxide (CuO) hybrid nanofluid. The influence of several parameters namely, fluid outlet and inlet temperature, nanofluid volume fraction, and ambient temperature on the collector performance was investigated. The fluid properties such as specific heat, viscosity, density, and thermal conductivity of the working fluid were estimated using correlations from the literature. The experimental work was carried out on SETC with pure water initially and later with nanofluids. The flow rate in the tube was fixed at 5 LPH and 8 LPH and the observations were noted several times in a sunny day to study the thermal performance. The experimental results revealed that higher volume fraction of Al₂O₃ nanofluid yield higher efficiency. The energy efficiency also increases with higher solar radiation intensity. Using hybrid nanofluid (Al₂O₃ + CuO), maximum collector efficiency of 84.23% and 94.78% were noted for 0.01 and 0.03 volume fractions at 8 LPH flow rate.

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