Question

Explain working of concentrating type of solar collector.

Answer 1

Figure concentrating type of solar collector: 

All concentrating solar thermal power (STP) technologies rely on four basic key elements: 

Concentrator, Receiver, Transport-storage, Steam generator (Heat exchanger) Condenser Steam turbine Alternator and  

Working of Concentrating type of Solar collector: The concentrator captures and concentrates solar radiation, This is then delivered to the receiver. The receiver absorbs the concentrated sunlight, Transferring its heat energy to a working fluid.(As good as coolant) This coolant is re-circulated again and again The transport-storage system passes the fluid from the receiver to the heat exchanger where steam at high temperature and high pressure generated.

OR

It consists of cylindrical parabolic concentrator and through reflector have been made of highly polished aluminum or silver glass or thin film of aluminized plastic or mirrors on a film base. And absorber which is well insulated is placed along focus axis. In this type solar collector, radiation is collected over the area of the reflecting surface and is concentrated at the focus of the parabola (absorber) Tracking of collector according to sun direction is necessary for better result. The tracking is always from south to north direction because there is more solar energy in this direction than the East-West arrangement.