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20th May, 2012
01:58
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20th Feb, 2011
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Solar Energy Enginering Terminology
"In questions of science, the authority of a thousand is not worth the humble
reasoning of a single individual."
(Galileo Galilei)
Electropedia -
is the world's most comprehensive online electrical and electronic terminology database
containing more than 20 000 terms and definitions in English and French organized by
subject area, with equivalent terms in various other languages.
Where are you: Home > Symbols
The term photovoltaics derives from the Greek word "phos" meaning light and the word
"volt" (named by
Alessandro Volta). Photovoltaics is a science, which
examines light-electricity conversion, respectively, photon energy-electric
current conversion. In other words it stands for
light-current conversion. As many other technical (and common) words even
significant amount of solar energy enginering terminology based on ancient greek language. Some
words were derived directly from greek language other indirectly from latin language. Few words originate in arabic language, they
were overtaken from arabic language in the early middle century.
Some important photovoltaic terms and symbols used in solar energy engineering and in photovoltaics
are presented in the tables below. Detailed information can be found in "IEC/TR2 61836, Solar
photovoltaic energy systems - Terms and symbols". For detailed definitions please see also references
at the bottom of the page.
Other topics:
Books >
Periodicals >
Reports >
Standards
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Terminology - units and symbols
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Global irradiance
Beam irradiance
Diffuse irradiance
Global irradiation *
Beam irradiation *
Diffuse irradiation *
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G
Gb
Gd
H
Hb
Hd
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W/m2
W/m2
W/m2
J/m2
J/m2
J/m2
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Specific heat
Thermal conductivity
Extinction coefficient
Index of refraction
Absorptance
Emittance
Reflectance
Density
Transmittance
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c
k
K
n
α
ε
ρ
ρ
τ
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J/kg K
W/m K
-
-
-
-
-
kg/m3
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Altitude (0 do +/- 90°)
Surface tilt angle (0 do +/- 90° tilt toward equator +)
Azimuth of surface (0 to + 360° - CW from N positive)
Declination (0 to +/- 23.45°)
Incidence angle (0 to + 90°)
Zenith angle (0 to + 90o)
Latitude (0 to +/- 90o, N from equator +)
Hour angle (-180° to + 180° , noon 0°, afternoon positive)
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α
β
γ
δ
i
Θz
Ψ
ω
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degrees (°)
degrees (°)
degrees (°)
degrees (°)
degrees (°)
degrees (°)
degrees (°)
degrees (°)
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*NOTE: The unit Wh/m2 (kWh/m2)
is often used in
technical practise in Europe. Please look for further information and
additional symbols in suggested literature.
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Terminology - books and dictionaries
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Glare, P.W.G.: Oxford Latin Dictionary ;
Oxford University Press, 1983, 978-0198642244.
Smith, W., Hall, T.D.: Smith's English-Latin Dictionary ;
Bolchazy-Carducci Publishers, 2000, ISBN 978-0865164918.
Smith, W., Lockwood, P.: Chambers Murray Latin-English Dictionary ;
Chambers; Rei Sub edition, 1994, ISBN 978-0550190031.
Green, T.M.: The Greek & Latin Roots of English ;
Rowman & Littlefield Publishers, Inc.; 4 edition, 2007, ISBN 978-0742547803.
Liddell, H.G., Scott, R.: An Intermediate Greek-English Lexicon: Founded upon the Seventh Edition of Liddell and Scott's Greek-English Lexicon
Oxford University Press, 1945, ISBN 978-0199102068.
Papaioannou, M., Papaioannou, P.: English and Greek Words of Hellenic Origin ;
Ellin, 2003, ISBN 978-9602867921.
Konstantinidis, A.: Greek words in english language (greek language), Self published, ISBN 960-90338-2-2.





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Units, Weights and Measures - books
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Cardarelli, F.: Encyclopaedia of Scientific Units, Weights and Measures: Their SI Equivalences and Origins ;
Springer, 2003, ISBN 978-1852336820.
Gupta, S.V.: Units of Measurement: Past, Present and Future. International System of Units (Springer Series in Materials Science)
Springer, 2009, ISBN 978-3642007378.
Lindeburg, M.R.: Engineering Unit Conversions
Professional Publications, Inc., 1998, ISBN 978-1591260998.



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Terminology and units - detailed information and conversion tools
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convert-me.com -
Here you will find interactive calculators for many measurement systems both
commonly used like metric and U.S. Avoirdupois and quite exotic like Ancient
Greek and Roman.
Languages:
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Electropedia -
is the world's most comprehensive online electrical and electronic terminology database
containing more than 20 000 terms and definitions in English and French organized by
subject area, with equivalent terms in various other languages.

Languages:
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More information and some interesting web sites
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IEC/TS 61836 Ed.2, Solar photovoltaic energy systems - Terms, definitions and symbols
Units and Symbols in Solar Energy; Solar Energy, vol.71, number 1, 2001
Beckman, W.A et al.: Units and symbols in solar energy; Solar Energy, vol. 21, no. 1, 1978, p. 65-68
Rösemann, R.: Solar Radiation Measurement, From Sensor to Application; Gengenbach Messtechnik, 2004.
TCAEP: The Constants and Equation Pages
The NIST Reference on Constants Units and Uncertainty
English weigths and measures
Eric Weisstein's World of Science
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