The concept : “Linear concentration of solar energy by multiple flat or slightly curved surfaces”
Basic components: The Linear Fresnel concentrating solar mechanism is composed of the parallel reflective surfaces (usually flat mirrors), the metal structure, thetracking mechanism, the secondary receiver (optionally) and the receiver.
Operation principle: The mirrors track the sun in one axis in order to concentrate the solar irradiation into the linear receiver located at a higher level. The concentrated solar irradiation can be further concentrated by a secondary mirror facing downwards. The receiver converts the concentrated irradiation to useful heat.
|Shape of mirrors
|| Flat or slightly curved
|Type of concentration
|Sun Concentration Ratio
|| 150 – 500 oC
|Heat Transfer fluid
|| Thermal oil, Molten salt, Pressurized water, 2 phase water
Basic Applications : The produced heat from the Linear Fresnel can be used for electricity generation by driving a turbine( or engine) connected to an electrical power generator, for steam generation by a heat exchanger, for cooling by driving a thermal (or compression) chiller and for desalination by driving a thermal (or electrical) desalination unit.
Technology variations : Moving receiver, Lens instead of reflectors, Multiple receivers, Curved geometry