Thermal Performance of a Dimpled Tube Parabolic Trough Solar Collector (PTSC) with SiO₂ Nanofluid

Table 3

Properties of nanofluids.

Properties	DI H2O-SiO2 0.1%	DI H2O-SiO2 0.2%	DI H2O-SiO2 0.3%	DI H2O-SiO2 0.4%	DI H2O-SiO2 0.5%
Density, kg/m^3	1014	1025	1029	1035	1042
Specific heat, kJ/kgK	410.6	414.8	418.5	422.7	427.8
Convective heat transfer coefficient, W/m^2K	0.6723	0.7562	0.7825	0.8251	0.8452
Viscosity, m^2/s	0.411^−6	0.388^−6	0.377^−6	0.286^−6	0.257^−6
Boiling point, °C	2950	2958	2960	2968	2970
Molar mass, g/mol	60.08	62.72	64.28	66.82	69.86