Tables for Terrestrial Solar Spectral Irradiance at Air Mass 1.5 for a 37-Deg Tilted Surface (Withdrawn 1999)

SCOPE
1.1 These tables define an air mass 1.5 solar spectral irradiance distribution for use in all solar applications where a standard terrestrial spectral irradiance is required for that part of solar irradiance, diffuse, and direct, that is incident on a sun-facing, 37°-tilted surface. A similar standard for direct normal irradiance is given in Standard E891.  
1.2 These tables are modeled data that were generated using a zero air mass solar spectrum based on the revised extraterrestrial spectrum of Neckel and Labs (1), the BRITE (3, 4) Monte Carlo radiative transfer code, and the 1962 U.S. Standard Atmosphere (5) with a rural aerosol (6, 7, 8). Further details are presented in Appendix X1.  
1.3 The air mass zero (AM0) spectrum that was used to generate the terrestrial spectrum was provided by C. Frohlich and C. Wehrli (1) and is a revised and extended Neckel and Labs (2) spectrum. Neckel and Labs revised their spectrum by employing newer limb-darkening data to convert from radiance to irradiance, as reported by Frohlich (9), citing the study by Hardrop (10). Comparisons by Frohlich with calibrated sunphotometer data from Mauna Loa, Hawaii, indicate that this new extraterrestrial spectrum is the best currently available.  
1.4 The development of the terrestrial solar spectrum data is based on work reported by Bird, Hulstrom, and Lewis (11). In computing the terrestrial values using the BRITE Monte Carlo radiation transfer code, the authors cited took the iterations to 2.4500 [mu]m only. We have extended the spectrum to 4.045 [mu]m using sixteen [lambda]i values from the original Standard E892-82. Irradiance values in Standard E892-82 were computed from the extraterrestrial spectrum represented by Standard E490. The additional data points were added to account for the solar irradiance in this region that account for approximately 1.5% of the total irradiance between 0.305 and 4.045 [mu]m. The errors propagated by doing so are insignificant.  
1.5 An air mass of 1.5, a turbidity of 0.27, and a tilt of 37° were chosen for this standard because they are representative of average conditions in the 48 contiguous states of the United States.

General Information

Status
Withdrawn
Publication Date
31-Dec-1991
Drafting Committee
Current Stage
Ref Project

Buy Standard

Guide
ASTM E892-87(1992) - Tables for Terrestrial Solar Spectral Irradiance at Air Mass 1.5 for a 37-Deg Tilted Surface (Withdrawn 1999)
English language
8 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)

ASTM E842 87 m 075951ro 0509997 080 m
Designation: E 892 - 87 (Reapproved 1992)
98
Standard Tables for
Terrestrial Solar Spectral lrradiance at Air Mass 1.5 for a 37O
Tilted Surface’
This standard is issued under the fixed designation E 892; the number immediately foUowing the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epdon (c) indicates an editorial change since the last revision or reapprowl.
INTRODUCTION
These tables utilize the recently revised (l)* extraterrestrial spectrum of Neckel and Labs (2) and
replace the previous standard based on Standard E490. In addition, refinements were made to
absorption and scattering calculations in the computer code (3,4) used to calculate the spectrum.
These refinements consist of a change in the depolarization factor in the Rayleigh scattering
calculation, a more accurate sampling technique for calculating scattered irradiance, and a better
choice of wavelengths to perform the calculations. Comparisons with the previous standard based
on Standard E 490 have shown that approximately a 5 % difference can exist in narrow band
widths of the spectrum, but for the integrated total little difference is apparent.
1. !kope represented by Standard E 490. The additional data points
were added to account for the solar irradiance in this region
1.1 These tables define an air mass 1.5 solar spectral
that account for approximately 1.5 % of the total irradiance
irradiance distribution for use in all solar applications where
between 0.305 and 4.045 pm. The errors propagated by
a standard terrestrial spectral irradiance is required for that
doing so are insignificant.
part of solar irradiance, diffuse, and direct, that is incident on
1.5 An air mass of 1.5, a turbidity of 0.27, and a tilt of 37’
a sun-facing, 37’-tilted surface. A similar standard for direct
were chosen for this standard because they are representative
normal irradiance is given in Standard E 89 1.
of average conditions in the 48 contiguous states of the
1.2 These tables are modeled data that were generated
United States.
using a zero air mass solar spectrum based on the revised
extraterrestrial spectrum of Neckel and Labs (l), the BRITE
2. Refereoced Documents
(3,4) Monte Carlo radiative transfer code, and the 1962 U.S.
Standard Atmosphere (5) with a rural aerosol (6, 7, 8).
2.1 ASTM Standards:
Further details are presented in Appendix Xl.
E 490 Standard Solar Constant and Air Mass Zero Solar
1.3 The air mass zero (AMO) spectrum that was used to
Spectral Irradiance Tables3
generate the terrestrial spectrum was provided by C. Frohlich
E 772 Terminology Relating to Solar Energy Conversion4
and C. Wehrli (1) and is a revised and extended Neckel and
E 89 1 Standard Tables for Terrestrial Direct Normal Solar
Labs (2) spectrum. Neckel and Labs revised their spectrum
Spectral Irradiance for Air Mass 1.54
by employing newer limb-darkening data to convert from
radiance to irradiance, as reported by Frohlich (9), citing the
3. Termioology
study by Hardrop (10). Comparisons by Frohlich with
3.1 Definitions from Terminology B 772):
calibrated sunphotometer data from Mauna Loa, Hawaii,
3.1.1 air mass (AM)-ratio of the mass of atmosphere in
indicate that this new extraterrestrial spectrum is the best
the actual observer-sun path to the mass that would exist if
currently available.
the observer were at sea level, at standard barometric
1.4 The development of the terrestrial solar spectrum data
pressure, and the sun were directly overhead.
is based on work reported by Bird, Hulstrom, and Lewis
(11). In computing the terrestrial values using the BRITE NoTE+(timetimes called air mass ratio.) Air mass varies with the
zenith angle of the sun and the local barometric pressure, that changes
Monte Carlo radiation transfer code, the authors cited took
with altitude. For sun zenith angle, 2, of 62’ or less, and local
the iterations to 2.4500 urn only. We have extended the
atmospheric pressure, P, where P, is standard atmospheric pressure, AM
spectrum to 4.045 pm using sixteen E& values from the
= set z (P/P,).
original Standard E 892 - 82. Irradiance values in Standard
3.1.2 solar h-radiance, d@bse, ES (d)-downward scat-
E 892 - 82 were computed Erom the extraterrestrial spectrum
tered solar flux as received on a horizontal surface from a
solid angle of 2x-steradian (hemisphere) with the exception
’ This standard is under the juhdiction of ASTM Committee E-44 on Solar,
of a conical solid angle with a 100 mrad (approximately 6”)
Geothermal, and other Altemative Energy Sources and is the direct responsibility
included plane angle centered upon the sun’s disk
of Subcommittee E44.02 on Environmental Parameters.
Current edition approved July 31, 1987. Published December 1987. Originally
published as E 892 - 82. Last previou
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.