EML4930L8

EML4930L8 - Sustainable Energy Science and Engineering...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
S ustainable E nergy S cience and E ngineering C enter Concentrating Collectors - Power Generation
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
S ustainable E nergy S cience and E ngineering C enter Concentrating Collectors Collectors are oriented to track the sun so that the beam radiation will be directed onto the absorbing surface Collector: Receiver and the concentrator Receiver: Radiation is absorbed and converted to some other energy form (e.g. heat). Concentrator: Collector that directs radiation onto the receiver. The aperture of the concentrator is the opening through which the solar radiation enters the concentrator Source: Chapter 7 of Solar Engineering of thermal processes by Duffie & Beckman, Wiley, 1991 Reference: http://www.powerfromthesun.net/book.htm
Background image of page 2
S ustainable E nergy S cience and E ngineering C enter a) Tubular absorbers with diffusive back reflector; b) Tubular absorbers with specular cusp reflector; c) Plane receiver with plane reflector; d) parabolic concentrator; e) Fresnel reflector f) Array of heliostats with central receiver Collector Configurations Goal: Increasing the radiation flux on receivers
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
S ustainable E nergy S cience and E ngineering C enter Concentrating Collectors Fresnel Lens: An optical device for concentrating light that is made of concentric rings that are faced at different angles so that light falling on any ring is focused to the same point. Parabolic trough collector: A high-temperature (above 360K) solar thermal concentrator with the capacity for tracking the sun using one axis of rotation. It uses a trough covered with a highly reflective surface to focus sunlight onto a linear absorber containing a working fluid that can be used for medium temperature space or process heat or to operate a steam turbine for power or electricity generation. Central Receiver: Also known as a power tower , a solar power facility that uses a field of two-axis tracking mirrors known as heliostat ( A device that tracks the movement of the sun). Each heliostat is individually positioned by a computer control system to reflect the sun's rays to a tower-mounted thermal receiver. The effect of many heliostats reflecting to a common point creates the combined energy of thousands of suns, which produces high-temperature thermal energy. In the receiver, molten nitrate salts absorb the heat energy. The hot salt is then used to boil water to steam, which is sent to a conventional steam turbine- generator to produce electricity.
Background image of page 4
S ustainable E nergy S cience and E ngineering C enter Concentration Types Planar and non-concentrating type which provides concentration ratios of up to four and are of the flat plate type. Line focusing type produces a high density of radiation on a line at the focus. Cylindrical parabolic concentrators are of this type and they could produce concentration ratios of up to ten.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 34

EML4930L8 - Sustainable Energy Science and Engineering...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online