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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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