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Solar radiation.ppt
- 1. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 1 01/08/2011 Solar Radiation Lecture #5
- 2. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 2 01/08/2011 Learning Objective and Outcome sheet Topic Solar radiation Learning Objectives Losses of solar radiation in the atmosphere Types of available solar radiation on the earth surface Measurement of different types of radiation on earth surface Estimation of total radiation falling on any surface Learning Outcome Extinction coefficient of earth surface and air mass. Global, beam, diffuse, and reflected radiation Pyranometer, Pyrheliometer, Sunshine recorder Tilt factors for beam, diffuse and reflected radiaon Problem/Assignment Learning Resources Summary This lecture enables learner to understand the losses occurred in the atmosphere and the total radiation available on any surface on the earth. Different instruments can be deployed for the measurement of the solar radiation is discussed. The importance of determining the position of the sun in the sky is discussed.
- 3. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 3 01/08/2011 Types of solar radiation on earth Direct
- 4. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 4 01/08/2011 Global solar radiation Ib Ir Id flected Diffuse Beam GlobalRadiation Re
- 5. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 5 01/08/2011 Global radiation on a tilt surface h d h b r h d d h b b G I I r I r I r I , , , ,
- 6. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 6 01/08/2011 Global radiation on a tilt surface reflection ground for factor Tilt r radiation diffuse for factor Tilt r radiation beam for factor Tilt r r d b h d h b r h d d h b b G I I r I r I r I , , , ,
- 7. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 7 01/08/2011 Global radiation on a tilt surface surface surface , , horizontal on radiation diffuse I horizontal on radiation beam I h d h b h d h b r h d d h b b G I I r I r I r I , , , ,
- 8. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 8 01/08/2011 Global radiation on a tilt surface ty reflectivi Ground r r r r d z b : , 2 cos 1 2 cos 1 cos cos h d h b r h d d h b b G I I r I r I r I , , , ,
- 9. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 9 01/08/2011 Global radiation on a tilt surface h d h b r h d d h b b G I I r I r I r I , , , , h d h b h G r d b I I I Hence r and r r surface horizontal For , , , , 0 , 1 , 1 0 : Pyranometer is placed horizontally to discard the reflected radiation from ground
- 10. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 10 01/08/2011 Measurement of solar radiation Pyrheliometer Pyranometer Source: http://en.wikipedia.org/wiki/Pyranometer
- 11. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 11 01/08/2011 Measurement of solar radiation Pyranometer for Global radiation Direct radiation Diffuse radiation
- 12. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 12 01/08/2011 Thermopile sensor Glass domes leveling feet PCB level Level Pyranometer schematic Source: http://en.wikipedia.org/wiki/Pyranometer
- 13. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 13 01/08/2011 Pyranometer shade ring Source: http://en.wikipedia.org/wiki/Pyranometer
- 14. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 14 01/08/2011 Sun shine recorder Glass sphere Recorder
- 15. IIT Bombay DESE EN 601:Lecture 5: Solar Radiation Slide 15 01/08/2011 Pyrheliometer It measures only beam or direct radiation with a small aperture (View = 5 o )