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Table of Contents
MODULE PROCESS (TYPE) DEFINITION KEYWORDS CREATION DATE PARAMETERS DECLARED VARIABLES DECLARED EXTERNAL VARIABLES USED DESCRIPTION REFERENCES DEVELOPER NAME AND ADDRESS NAMEsoltab_prms.f
MODULE PROCESS (TYPE)Solar Radiation Computation
DEFINITIONThis module computes the potential solar radiation and the sunrise and sunset times for a horizontal surface and for any slope/aspect combination.
KEYWORDSCREATION DATEJuly 1992
PARAMETERS DECLAREDradpl_aspectAspect for each radiation plane, in degrees. radpl_lat Latitude of radiation plane, in degrees. radpl_slope Slope for each radiation plane, in decimal feet/feet.
VARIABLES DECLAREDradpl_soltabPotential shortwave radiation for each radiation plane for each timestep sunhrs_soltab Hours between sunrise and sunset for radiation plane, in units of 12 hrs radpl_cossl Cosine of the slope of the radiation plane. radpl_sunrise Time of sunrise for radiation plane. radpl_sunrise2 Time of second sunrise on radiation plane if applicable. radpl_sunset Time of sunset for radiation plane. radpl_sunset2 Time of second sunset on radiation plane if applicable.
EXTERNAL VARIABLES USEDNone
DESCRIPTIONThe initialize section of this module computes the potential solar radiation, hours of daylight and sunrise/sunset times for a horizontal surface and for each radiation plane for 24 dates through out the year. Because of the symmetry of the solar year, the potential solar radiation for these 24 dates can be represented by a table of 13 values. The 13 dates and date pairs are listed in table 1. Table values are computed using a combination of methods described in Frank and Lee (1966) and Swift (1976).Table l.--sequence number and dates of the 13 potential solar radiation values for each slope-aspect combination ________________________________________________________________________ Sequence No. Date(s) ________________________________________________________________________ 1---------------------------------------------- December 22 2---------------------------------------------- January 10, December 3 3---------------------------------------------- January 23, November 19 4---------------------------------------------- February 7, November 5 5---------------------------------------------- February 20, October 22 6---------------------------------------------- March 7. October 8 7---------------------------------------------- March 21, September 23 8---------------------------------------------- April 4, September 9 9---------------------------------------------- April 19, August 25 10---------------------------------------------May 3, August 10 11-------------------------------------------- May 18, July 27 12-------------------------------------------- June 1. July 12 13-------------------------------------------- June22 ___________________________________________________________________________
REFERENCES
DEVELOPER NAME AND ADDRESSGeorge H. Leavelsey
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