Design and Preliminary Test of Water-Injected Fresnel Concentrators

Fig. 5. Concentrating characteristics of water-injected Fresnel concentrator and traditional non-water-injected Fresnel concentrator under different solar incident angles. (a) Concentration efficiency; (b) peak flux

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Fig. 6. Concentrating characteristics of water-injected Fresnel concentrator with different tooth widths under different solar incident angles. (a) Concentration efficiency; (b) peak flux

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Fig. 7. Test prototype of water-injected type Fresnel concentrator. (a) Flat view; (b) bottom view

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Fig. 8. Distribution of light spots in focal plane. (a) Actual light spot; (b) simulated theoretical spot

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Table 1. Structure parameters and simulation parameters of water-injected Fresnel concentrator

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Table 1. Structure parameters and simulation parameters of water-injected Fresnel concentrator

Parameter	Value
Focal length of concentrator /mm	2000
Aperture (or length) of concentrator /mm	2060
Width of concentrator /mm	1000
Tooth width of Fresnel concentrator /mm	50
Number of teeth of Fresnel concentrator	40
Thickness of flat plate /mm	1.5
Refractive index of glass	1.47
Refractive index of water	1.33
Refractive index of air	1.0
Width of receive target /mm	100
Length of receive target in focal line direction /mm	1000
Initial sunlight incident angle /(°)	0
Sunlight divergence angle /mrad	9.3
Direct normal irradiance of sunlight /(W·m^-2)	1000