EML4930L3

EML4930L3 - Sustainable Energy Science and Engineering...

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S ustainable E nergy S cience and E ngineering C enter Solar radiation: Refer to Lectures 5 & 6 of EML 4450 Fall 2006. Photovoltaic Systems Engineering
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S ustainable E nergy S cience and E ngineering C enter Irradiance & Irradiation Irradiance is given in W/m 2 and is represented by the symbol G. The rate at which radiant energy is incident on a surface per unit area of surface. Irradiation is given in J/m 2 and is the incident energy per unit area on a surface - determined by integration of irradiance over a specified time, usually an hour or a day. Insolation is a term used to solar energy irradiation Radiosity is the rate at which radiant energy leaves a surface, per unit area, by combined emission, reflection and transmission.
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S ustainable E nergy S cience and E ngineering C enter Typical Solar Irradiance
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S ustainable E nergy S cience and E ngineering C enter PV Panel Orientation
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S ustainable E nergy S cience and E ngineering C enter http://rredc.nrel.gov/solar/pubs/redbook/PDFs/FL.PDF Tallahassee Solar Radiation Data
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S ustainable E nergy S cience and E ngineering C enter 0 1 2 3 4 5 6 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Monthly radiation (kWh/m 2 /day) Latitude - 15 Latitude Latitude + 15 0 1 2 3 4 5 6 7 8 9 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec No tracking 1-Axis tracking 2-Axis tracking Tallahassee Monthly Solar Insolation
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S ustainable E nergy S cience and E ngineering C enter E global = 650 sin 4 3 α 30 + 325 × 8 × 10 5 × h + 1 ( ) W/m 2 For clear sky condition Annual Global Irradiance Where α is the solar altitude in degrees and h is the geographic altitude in meters (Tallahassee: 21 m). Masato Oki & Hiroyuki Shiina, “Preliminary study on an estimation method for annual solar irradiance at various geological altitudes”, Eighth International IBPSA Conference, Eindhoven, Netherlands, August 2003. Source: To find the solar altitude go to the following site: http://aa.usno.navy.mil/data/docs/AltAz.html
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S ustainable E nergy S cience and E ngineering C enter Ibrahim Reda & Afshin Andreas, “Solar Position Algorithm for Solar Radiation Applications”, NREL/TP- 560-34302, November 2005. http://www.nrel.gov/docs/fy06osti/34302.pdf Algorithm
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S ustainable E nergy S cience and E ngineering C enter The global spectrum comprises the direct plus the diffused light. Global Radiation
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S ustainable E nergy S cience and E ngineering C enter AM 1.5d Spectrum Energy Distribution Silicon solar cells with a bandgap of 1.13ev can maximally absorb 77% of the terrestrial solar energy.
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S ustainable E nergy S cience and E ngineering C enter PV Electricity Applications (market share in 2002) • Grid connected systems (71%) • Off-grid industrial applications (15%) • Rural electrification in developing countries (7%) • Consumer applications (7%) Net producer of energy: generating between 5 and 12 times more energy over their lifetime than is required for their manufacture. Ideally suited for distributed generation of electricity and easily scalable.
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S ustainable E nergy S cience and E ngineering C
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This note was uploaded on 10/22/2011 for the course ESC 2005 taught by Professor Staff during the Spring '11 term at FSU.

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EML4930L3 - Sustainable Energy Science and Engineering...

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