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PART 6

Concentrator Optics

Agenda

Why Concentration Concentration Ratio

Parabolic Geometry The Parabola Parabolic Cylinder Paraboloid

Parabolic and Spherical Optics Two-dimensional Ray Trace Diagrams Line-focus Troughs Point-focus Dishes

Reflection of Energy to the Receiver Reflection of Parallel Rays Reflection of Non-parallel Rays Contribution of Errors

Reflection to a Fixed Point (the Power Tower) Principles of Reflection and Refraction

Mirrors Lenses Total Internal Reflection

Dielectric Reflection and Antireflection Coatings Fresnel Lens Optics

Why Concentration

Collector stagnation temperature The temperature of the receiver increases until the

convective and radiation heat loss from the receiver equals the absorbed solar energy

The rate at which heat is actively removed from the collector determines the collector operating temperature

Receiver heat loss can be reduced by operating the collector near the ambient temperature to reduce the size of the hot surface (i.e., the receiver)

Concentration Ratio Optical Concentration Ratio (CRo). Geometric Concentration Ratio (CRg)

Parabolic Geometry

Fixed (non-tracking) Apertures

Parabolic Cylinder (Trough), Paraboloid

Parabolic and Spherical Optics

equation for a line tangent to this circle at the point (x1 , y1)

Two -Dimensional Ray Trace Diagrams

Parabolic trough endloss

circular mirrors with different rim angles

Reflection of Parallel Rays

Reflection of Nonparallel Rays

The Contribution of Errors

Thanks

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