Fig. 1 Specular reflection path diagram More about this image found in Specular reflection path diagram

Fig. 2 The first specular incident ray path diagram More about this image found in The first specular incident ray path diagram

Fig. 3 The theoretical CR changes with ξ and μ ( W i = 2 b i , 2 r = 60 mm) More about this image found in The theoretical CR changes with ξ and μ ( W i = 2 b i , 2 r = 60 mm...

Fig. 4 The theoretical CR changes with n ( W i = 2 b i , 2 r = 60 mm) More about this image found in The theoretical CR changes with n ( W i = 2 b i , 2 r = 60 mm)

Fig. 5 The area utilization rate k changes with ξ and μ ( W i = 2 b i , 2 r = 60 mm) More about this image found in The area utilization rate k changes with ξ and μ ( W i = 2 b i , 2...

Fig. 6 The area utilization rate k changes with n ( W i = 2 b i , 2 r = 60 mm) More about this image found in The area utilization rate k changes with n ( W i = 2 b i , 2 r = 60...

Fig. 7 Effective radiation diagram of multiple collector tubes connection: ( a ) β = β 2, s , ( b ) β = β 2, f , and ( c ) β = β 2, e More about this image found in Effective radiation diagram of multiple collector tubes connection: ( a ) ...

Fig. 8 The utilization rate of heat collection length ( l 0 = 1.92 m, a = 1.2 m) More about this image found in The utilization rate of heat collection length ( l 0 = 1.92 m, a = 1.2 ...

Fig. 9 The simulated gray scale of energy flux density ( r = 50 mm, n = 20, I s = 1000 W/m 2 ): ( a ) ξ = 10, ( b ) ξ = 16, and ( c ) ξ = 20 More about this image found in The simulated gray scale of energy flux density ( r = 50 mm, n = 20, I ...

Fig. 10 Energy flux in the width direction of the receiving focal plane ( r = 50 mm, n = 20, I s = 1000 W/m 2 ) More about this image found in Energy flux in the width direction of the receiving focal plane ( r = 50 m...

Fig. 11 Spectral reflectivity of the glass mirror ( λ 1 = 280 nm, λ 216 = 2430 nm) More about this image found in Spectral reflectivity of the glass mirror ( λ 1 = 280 nm, λ 216 = 2430...

Fig. 12 Spectral transmissivity of the glass enclosure of the collector tube ( λ 1 = 280 nm, λ 216 = 2430 nm) More about this image found in Spectral transmissivity of the glass enclosure of the collector tube ( λ 1...

Fig. 13 Spectral absorptivity of the absorption coating of the collector tube ( λ 1 = 280 nm, λ 216 = 2430 nm) More about this image found in Spectral absorptivity of the absorption coating of the collector tube ( λ ...

Fig. 14 Reflection spectrum of glass mirror, transmittance spectrum of glass enclosure, and absorption spectrum of coating of collector tube ( λ 1 = 280 nm, λ 216 = 2430 nm) More about this image found in Reflection spectrum of glass mirror, transmittance spectrum of glass enclos...

Fig. 15 Physical picture of the experimental platform More about this image found in Physical picture of the experimental platform

Fig. 16 Torsional blade More about this image found in Torsional blade

Fig. 17 Photothermal experimental data of group 1 (2 r = 60 mm, l 0 = 1.92 m, a = 1.2 m, l′ = 0.6 m, and CR = 34.86): ( a ) inlet and outlet temperature; ( b ) flow rate Q t , temperature difference T out − T in , and the solar direct radiation intensity I S ; and ( c ) theoretica... More about this image found in Photothermal experimental data of group 1 (2 r = 60 mm, l 0 = 1.92 m, ...

Fig. 18 Photothermal experimental data of group 2 (2 r = 60 mm, l 0 = 1.92 m, a = 1.2 m, l′ = 0.6 m, and CR = 34.86): ( a ) inlet and outlet temperature; ( b ) flow rate Q t , temperature difference T out − T in , and the solar direct radiation intensity I S ; and ( c ) theoretica... More about this image found in Photothermal experimental data of group 2 (2 r = 60 mm, l 0 = 1.92 m, ...

Fig. 19 Photothermal experimental data of group 3 (2 r = 60 mm, l 0 = 1.92 m, a = 1.2 m, l′ = 0.6 m, and CR = 34.86): ( a ) inlet and outlet temperature; ( b ) flow rate Q t , temperature difference T out − T in , and the solar direct radiation intensity I S ; and ( c ) theoretica... More about this image found in Photothermal experimental data of group 3 (2 r = 60 mm, l 0 = 1.92 m, ...