Parabolic Dish Reflector

                                                                Parabolic Dish Focuses solar energy  at the Focal point of Recevier

• Dual  Aixs
• Can attain temp of 1800 c
• PDR consists of parabolic shaped dish concentrator which redirects solar emission into a receiver    which is fixed at the focal point3

 

Heliostat Field collector

• A multiplicity of plane mirrors can be used to reflect incident solar radiations on to a matual target and very high input of radiaut energy is obtained this is also called central receiver collector
• They are highly efficient;

Direct Method

• Direct Method is by using photovoltaic solar cells silicon solar cells have been widely used
• PV is a device that converts light in to electric current using the photovoltaic effect
• Solar  Photovolatic system(PV system) Has been applied to solar pumps for water pumping for drinking water supply

• For paractical use this usully requires conversion to certain desired voltages or alternating current (AC) through the use of inverters
• Multiple solar cells are connected inside modules modules  are wired tied to an inverter which produces power at desired voltage

Reflective Materials

• Reflective materials are used to make the surface are used to make the surface brighter and to capture the more solar radiations
• Selection of reflective materials to design parabolic heat collecter has very significant role
• A perfect material is one that has following Characerstics

1. High Reflection Efficiency
2. Can be easily attached
3. Long lasting in a varity of environmental conditions
4. Able to bear ultra vialet radiations
5. Easily available
6. E-conomical

• Dual  Aixs