1. PART 6 1 Concentrator Optics

2. 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

3. 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 ( CR o ).  Geometric Concentration Ratio ( CR g )

4. Parabolic Geometry

5. Fixed (non-tracking) Apertures

6. Parabolic Cylinder (Trough), Paraboloid

7. Parabolic and Spherical Optics equation for a line tangent to this circle at the point ( x 1, y 1 )

8. Two -Dimensional Ray Trace Diagrams

9. Parabolic trough endloss

10. circular mirrors with different rim angles

11. Reflection of Parallel Rays

13. Reflection of Nonparallel Rays

14. The Contribution of Errors

18. Thanks Be prepared for coming Quiz Team Assignment will be sent to you soon