| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
greg |
2.9 |
static const char RCSid[] = "$Id$"; |
| 3 |
greg |
2.1 |
#endif |
| 4 |
greg |
2.9 |
/* Copyright (c) 1994,2006 *Fraunhofer Institut for Solar Energy Systems |
| 5 |
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* Heidenhofstr. 2, D-79110 Freiburg, Germany |
| 6 |
greg |
2.1 |
* *Agence de l'Environnement et de la Maitrise de l'Energie |
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* Centre de Valbonne, 500 route des Lucioles, 06565 Sophia Antipolis Cedex, France |
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* *BOUYGUES |
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* 1 Avenue Eugene Freyssinet, Saint-Quentin-Yvelines, France |
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greg |
2.9 |
* |
| 11 |
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* 24.1.2006 some adjustments for cygwin compilation, inclusion of RADIANCE3.7 libraries, by J. Wienold |
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* 2011/10/08 [email protected]: |
| 13 |
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* - integrated coeff_perez.dat and defangles.dat |
| 14 |
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* - avoid some segfaults caused by out of range parameters and |
| 15 |
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* - numerically dangerous range checks |
| 16 |
greg |
2.1 |
*/ |
| 17 |
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| 18 |
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/* |
| 19 |
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* gendaylit.c program to generate the angular distribution of the daylight. |
| 20 |
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* Our zenith is along the Z-axis, the X-axis |
| 21 |
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* points east, and the Y-axis points north. |
| 22 |
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*/ |
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#include <stdio.h> |
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#include <string.h> |
| 26 |
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#include <math.h> |
| 27 |
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#include <stdlib.h> |
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#include "color.h" |
| 30 |
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#include "paths.h" |
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greg |
2.9 |
#define DOT(v1,v2) (v1[0]*v2[0]+v1[1]*v2[1]+v1[2]*v2[2]) |
| 33 |
greg |
2.1 |
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| 34 |
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double normsc(); |
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greg |
2.9 |
/*static char *rcsid="$Header: /tmp_mnt/nfs/koll7/users/koll/jean/program/radiance/RAD/RCS/gendaylit.c,v 1.13 94/05/17 19:21:01 jean Exp Locker: jean $";*/ |
| 37 |
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| 38 |
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float coeff_perez[] = { |
| 39 |
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1.3525,-0.2576,-0.2690,-1.4366,-0.7670,0.0007,1.2734,-0.1233,2.8000,0.6004,1.2375,1.000,1.8734,0.6297,0.9738,0.2809,0.0356,-0.1246,-0.5718,0.9938, |
| 40 |
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-1.2219,-0.7730,1.4148,1.1016,-0.2054,0.0367,-3.9128,0.9156,6.9750,0.1774,6.4477,-0.1239,-1.5798,-0.5081,-1.7812,0.1080,0.2624,0.0672,-0.2190,-0.4285, |
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-1.1000,-0.2515,0.8952,0.0156,0.2782,-0.1812,-4.5000,1.1766,24.7219,-13.0812,-37.7000,34.8438,-5.0000,1.5218,3.9229,-2.6204,-0.0156,0.1597,0.4199,-0.5562, |
| 42 |
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-0.5484,-0.6654,-0.2672,0.7117,0.7234,-0.6219,-5.6812,2.6297,33.3389,-18.3000,-62.2500,52.0781,-3.5000,0.0016,1.1477,0.1062,0.4659,-0.3296,-0.0876,-0.0329, |
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-0.6000,-0.3566,-2.5000,2.3250,0.2937,0.0496,-5.6812,1.8415,21.0000,-4.7656,-21.5906,7.2492,-3.5000,-0.1554,1.4062,0.3988,0.0032,0.0766,-0.0656,-0.1294, |
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-1.0156,-0.3670,1.0078,1.4051,0.2875,-0.5328,-3.8500,3.3750,14.0000,-0.9999,-7.1406,7.5469,-3.4000,-0.1078,-1.0750,1.5702,-0.0672,0.4016,0.3017,-0.4844, |
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-1.0000,0.0211,0.5025,-0.5119,-0.3000,0.1922,0.7023,-1.6317,19.0000,-5.0000,1.2438,-1.9094,-4.0000,0.0250,0.3844,0.2656,1.0468,-0.3788,-2.4517,1.4656, |
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-1.0500,0.0289,0.4260,0.3590,-0.3250,0.1156,0.7781,0.0025,31.0625,-14.5000,-46.1148,55.3750,-7.2312,0.4050,13.3500,0.6234,1.5000,-0.6426,1.8564,0.5636}; |
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float defangle_theta[] = {84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 12, 12, 12, 12, 12, 12, 0}; |
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float defangle_phi[] = {0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336, 348, 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336, 348, 0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 60, 120, 180, 240, 300, 0}; |
| 52 |
greg |
2.1 |
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/* Perez sky parametrization : epsilon and delta calculations from the direct and diffuse irradiances */ |
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double sky_brightness(); |
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double sky_clearness(); |
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/* calculation of the direct and diffuse components from the Perez parametrization */ |
| 60 |
greg |
2.9 |
double diffuse_irradiance_from_sky_brightness(); |
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greg |
2.1 |
double direct_irradiance_from_sky_clearness(); |
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| 63 |
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/* Perez global horizontal, diffuse horizontal and direct normal luminous efficacy models : input w(cm)=2cm, solar zenith angle(degrees); output efficacy(lm/W) */ |
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double glob_h_effi_PEREZ(); |
| 66 |
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double glob_h_diffuse_effi_PEREZ(); |
| 67 |
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double direct_n_effi_PEREZ(); |
| 68 |
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/*likelihood check of the epsilon, delta, direct and diffuse components*/ |
| 69 |
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void check_parametrization(); |
| 70 |
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void check_irradiances(); |
| 71 |
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void check_illuminances(); |
| 72 |
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void illu_to_irra_index(); |
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greg |
2.9 |
void print_error_sky(); |
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greg |
2.1 |
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| 75 |
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| 76 |
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/* Perez sky luminance model */ |
| 77 |
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double calc_rel_lum_perez(double dzeta,double gamma,double Z, |
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greg |
2.9 |
double epsilon,double Delta,float coeff_perez[]); |
| 79 |
greg |
2.1 |
/* coefficients for the sky luminance perez model */ |
| 80 |
greg |
2.9 |
void coeff_lum_perez(double Z, double epsilon, double Delta, float coeff_perez[]); |
| 81 |
greg |
2.1 |
double radians(double degres); |
| 82 |
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double degres(double radians); |
| 83 |
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void theta_phi_to_dzeta_gamma(double theta,double phi,double *dzeta,double *gamma, double Z); |
| 84 |
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double integ_lv(float *lv,float *theta); |
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| 86 |
greg |
2.9 |
void printdefaults(); |
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void computesky(); |
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void printhead(int ac, char** av); |
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void userror(char* msg); |
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void printsky(); |
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greg |
2.1 |
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greg |
2.9 |
FILE * frlibopen(char* fname); |
| 93 |
greg |
2.1 |
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| 94 |
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/* astronomy and geometry*/ |
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double get_eccentricity(); |
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double air_mass(); |
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| 98 |
greg |
2.9 |
extern int jdate(int month, int day); |
| 99 |
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extern double stadj(int jd); |
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extern double sdec(int jd); |
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extern double salt(double sd, double st); |
| 102 |
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extern double sazi(double sd, double st); |
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greg |
2.1 |
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| 105 |
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/* sun calculation constants */ |
| 106 |
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extern double s_latitude; |
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extern double s_longitude; |
| 108 |
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extern double s_meridian; |
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| 110 |
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const double AU = 149597890E3; |
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const double solar_constant_e = 1367; /* solar constant W/m^2 */ |
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const double solar_constant_l = 127.5; /* solar constant klux */ |
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| 114 |
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const double half_sun_angle = 0.2665; |
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const double half_direct_angle = 2.85; |
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| 117 |
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const double skyclearinf = 1.000; /* limitations for the variation of the Perez parameters */ |
| 118 |
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const double skyclearsup = 12.1; |
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const double skybriginf = 0.01; |
| 120 |
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const double skybrigsup = 0.6; |
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| 124 |
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/* required values */ |
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int month, day; /* date */ |
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double hour; /* time */ |
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int tsolar; /* 0=standard, 1=solar */ |
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double altitude, azimuth; /* or solar angles */ |
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| 132 |
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/* definition of the sky conditions through the Perez parametrization */ |
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greg |
2.9 |
double skyclearness = 0; |
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double skybrightness = 0; |
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greg |
2.1 |
double solarradiance; /*radiance of the sun disk and of the circumsolar area*/ |
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greg |
2.9 |
double diffuseilluminance, directilluminance, diffuseirradiance, directirradiance; |
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greg |
2.1 |
double sunzenith, daynumber=150, atm_preci_water=2; |
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| 139 |
greg |
2.9 |
double sunaltitude_border = 0; |
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double diffnormalization = 0; |
| 141 |
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double dirnormalization = 0; |
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greg |
2.1 |
double *c_perez; |
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| 144 |
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int output=0; /*define the unit of the output (sky luminance or radiance): visible watt=0, solar watt=1, lumen=2*/ |
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int input=0; /*define the input for the calulation*/ |
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greg |
2.9 |
int suppress_warnings=0; |
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greg |
2.1 |
/* default values */ |
| 150 |
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int cloudy = 0; /* 1=standard, 2=uniform */ |
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int dosun = 1; |
| 152 |
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double zenithbr = -1.0; |
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double betaturbidity = 0.1; |
| 154 |
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double gprefl = 0.2; |
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int S_INTER=0; |
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| 157 |
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/* computed values */ |
| 158 |
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double sundir[3]; |
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greg |
2.9 |
double groundbr = 0; |
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greg |
2.1 |
double F2; |
| 161 |
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double solarbr = 0.0; |
| 162 |
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int u_solar = 0; /* -1=irradiance, 1=radiance */ |
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| 164 |
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char *progname; |
| 165 |
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char errmsg[128]; |
| 166 |
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| 167 |
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| 168 |
greg |
2.9 |
int main(int argc, char** argv) |
| 169 |
greg |
2.1 |
{ |
| 170 |
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int i; |
| 171 |
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| 172 |
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progname = argv[0]; |
| 173 |
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if (argc == 2 && !strcmp(argv[1], "-defaults")) { |
| 174 |
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printdefaults(); |
| 175 |
greg |
2.9 |
return 0; |
| 176 |
greg |
2.1 |
} |
| 177 |
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if (argc < 4) |
| 178 |
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userror("arg count"); |
| 179 |
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if (!strcmp(argv[1], "-ang")) { |
| 180 |
greg |
2.9 |
altitude = atof(argv[2]) * (M_PI/180); |
| 181 |
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azimuth = atof(argv[3]) * (M_PI/180); |
| 182 |
greg |
2.1 |
month = 0; |
| 183 |
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} else { |
| 184 |
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month = atoi(argv[1]); |
| 185 |
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if (month < 1 || month > 12) |
| 186 |
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userror("bad month"); |
| 187 |
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day = atoi(argv[2]); |
| 188 |
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if (day < 1 || day > 31) |
| 189 |
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userror("bad day"); |
| 190 |
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hour = atof(argv[3]); |
| 191 |
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if (hour < 0 || hour >= 24) |
| 192 |
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userror("bad hour"); |
| 193 |
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tsolar = argv[3][0] == '+'; |
| 194 |
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} |
| 195 |
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for (i = 4; i < argc; i++) |
| 196 |
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if (argv[i][0] == '-' || argv[i][0] == '+') |
| 197 |
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switch (argv[i][1]) { |
| 198 |
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case 's': |
| 199 |
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cloudy = 0; |
| 200 |
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dosun = argv[i][0] == '+'; |
| 201 |
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break; |
| 202 |
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case 'r': |
| 203 |
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case 'R': |
| 204 |
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u_solar = argv[i][1] == 'R' ? -1 : 1; |
| 205 |
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solarbr = atof(argv[++i]); |
| 206 |
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break; |
| 207 |
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case 'c': |
| 208 |
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cloudy = argv[i][0] == '+' ? 2 : 1; |
| 209 |
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dosun = 0; |
| 210 |
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break; |
| 211 |
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case 't': |
| 212 |
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betaturbidity = atof(argv[++i]); |
| 213 |
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break; |
| 214 |
greg |
2.9 |
case 'w': |
| 215 |
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suppress_warnings = 1; |
| 216 |
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break; |
| 217 |
greg |
2.1 |
case 'b': |
| 218 |
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zenithbr = atof(argv[++i]); |
| 219 |
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break; |
| 220 |
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case 'g': |
| 221 |
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gprefl = atof(argv[++i]); |
| 222 |
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break; |
| 223 |
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case 'a': |
| 224 |
greg |
2.9 |
s_latitude = atof(argv[++i]) * (M_PI/180); |
| 225 |
greg |
2.1 |
break; |
| 226 |
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case 'o': |
| 227 |
greg |
2.9 |
s_longitude = atof(argv[++i]) * (M_PI/180); |
| 228 |
greg |
2.1 |
break; |
| 229 |
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case 'm': |
| 230 |
greg |
2.9 |
s_meridian = atof(argv[++i]) * (M_PI/180); |
| 231 |
greg |
2.1 |
break; |
| 232 |
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| 233 |
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case 'O': |
| 234 |
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output = atof(argv[++i]); /*define the unit of the output of the program : |
| 235 |
greg |
2.9 |
sky and sun luminance/radiance (0==W visible, 1==W solar radiation, 2==lm) */ |
| 236 |
greg |
2.1 |
break; |
| 237 |
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| 238 |
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case 'P': |
| 239 |
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input = 0; /* Perez parameters: epsilon, delta */ |
| 240 |
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skyclearness = atof(argv[++i]); |
| 241 |
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skybrightness = atof(argv[++i]); |
| 242 |
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break; |
| 243 |
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| 244 |
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case 'W': /* direct normal Irradiance [W/m^2] */ |
| 245 |
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input = 1; /* diffuse horizontal Irrad. [W/m^2] */ |
| 246 |
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directirradiance = atof(argv[++i]); |
| 247 |
greg |
2.9 |
diffuseirradiance = atof(argv[++i]); |
| 248 |
greg |
2.1 |
break; |
| 249 |
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| 250 |
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case 'L': /* direct normal Illuminance [Lux] */ |
| 251 |
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input = 2; /* diffuse horizontal Ill. [Lux] */ |
| 252 |
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directilluminance = atof(argv[++i]); |
| 253 |
greg |
2.9 |
diffuseilluminance = atof(argv[++i]); |
| 254 |
greg |
2.1 |
break; |
| 255 |
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| 256 |
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case 'G': /* direct horizontal Irradiance [W/m^2] */ |
| 257 |
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input = 3; /* diffuse horizontal Irrad. [W/m^2] */ |
| 258 |
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directirradiance = atof(argv[++i]); |
| 259 |
greg |
2.9 |
diffuseirradiance = atof(argv[++i]); |
| 260 |
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break; |
| 261 |
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| 262 |
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case 'l': |
| 263 |
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sunaltitude_border = atof(argv[++i]); |
| 264 |
greg |
2.1 |
break; |
| 265 |
greg |
2.9 |
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| 266 |
greg |
2.1 |
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| 267 |
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default: |
| 268 |
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sprintf(errmsg, "unknown option: %s", argv[i]); |
| 269 |
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userror(errmsg); |
| 270 |
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} |
| 271 |
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else |
| 272 |
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userror("bad option"); |
| 273 |
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| 274 |
greg |
2.9 |
if (fabs(s_meridian-s_longitude) > 30*M_PI/180) |
| 275 |
greg |
2.1 |
fprintf(stderr, |
| 276 |
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"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
| 277 |
greg |
2.9 |
progname, (s_longitude-s_meridian)*12/M_PI); |
| 278 |
greg |
2.1 |
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| 279 |
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| 280 |
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/* allocation dynamique de memoire pour les pointeurs */ |
| 281 |
greg |
2.9 |
if ( (c_perez = calloc(5, sizeof(double))) == NULL ) |
| 282 |
greg |
2.1 |
{ |
| 283 |
|
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fprintf(stderr,"Out of memory error in function main !"); |
| 284 |
greg |
2.9 |
return 1; |
| 285 |
greg |
2.1 |
} |
| 286 |
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| 287 |
|
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printhead(argc, argv); |
| 288 |
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| 289 |
|
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computesky(); |
| 290 |
|
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printsky(); |
| 291 |
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| 292 |
greg |
2.9 |
return 0; |
| 293 |
greg |
2.1 |
} |
| 294 |
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| 295 |
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| 296 |
greg |
2.9 |
void computesky() /* compute sky parameters */ |
| 297 |
greg |
2.1 |
{ |
| 298 |
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| 299 |
|
|
/* new variables */ |
| 300 |
greg |
2.6 |
int j; |
| 301 |
greg |
2.1 |
float *lv_mod; /* 145 luminance values*/ |
| 302 |
|
|
/* 145 directions for the calculation of the normalization coefficient, coefficient Perez model */ |
| 303 |
greg |
2.9 |
float *theta_o, *phi_o; |
| 304 |
greg |
2.1 |
double dzeta, gamma; |
| 305 |
|
|
double normfactor; |
| 306 |
|
|
|
| 307 |
|
|
|
| 308 |
|
|
|
| 309 |
|
|
/* compute solar direction */ |
| 310 |
|
|
|
| 311 |
|
|
if (month) { /* from date and time */ |
| 312 |
|
|
int jd; |
| 313 |
|
|
double sd, st; |
| 314 |
|
|
|
| 315 |
|
|
jd = jdate(month, day); /* Julian date */ |
| 316 |
|
|
sd = sdec(jd); /* solar declination */ |
| 317 |
|
|
if (tsolar) /* solar time */ |
| 318 |
|
|
st = hour; |
| 319 |
|
|
else |
| 320 |
|
|
st = hour + stadj(jd); |
| 321 |
|
|
altitude = salt(sd, st); |
| 322 |
|
|
azimuth = sazi(sd, st); |
| 323 |
|
|
|
| 324 |
|
|
daynumber = (double)jdate(month, day); |
| 325 |
|
|
|
| 326 |
|
|
} |
| 327 |
greg |
2.9 |
|
| 328 |
|
|
|
| 329 |
|
|
|
| 330 |
|
|
|
| 331 |
|
|
|
| 332 |
|
|
/* if loop for the -l option. 01/2013 Sprenger */ |
| 333 |
|
|
|
| 334 |
|
|
if (altitude*180/M_PI < sunaltitude_border) { |
| 335 |
|
|
|
| 336 |
|
|
if (suppress_warnings==0) |
| 337 |
|
|
fprintf(stderr, "Warning: sun altitude (%.3f degrees) below the border (%.3f degrees)\n",altitude*180/M_PI,sunaltitude_border); |
| 338 |
|
|
print_error_sky(); |
| 339 |
|
|
exit(0); |
| 340 |
|
|
} |
| 341 |
|
|
|
| 342 |
|
|
|
| 343 |
|
|
|
| 344 |
|
|
|
| 345 |
|
|
|
| 346 |
|
|
if (!cloudy && altitude > 87.*M_PI/180.) { |
| 347 |
|
|
|
| 348 |
|
|
if (suppress_warnings==0) { |
| 349 |
|
|
fprintf(stderr, |
| 350 |
greg |
2.1 |
"%s: warning - sun too close to zenith, reducing altitude to 87 degrees\n", |
| 351 |
|
|
progname); |
| 352 |
greg |
2.9 |
} |
| 353 |
|
|
altitude = 87.*M_PI/180.; |
| 354 |
greg |
2.1 |
} |
| 355 |
greg |
2.9 |
|
| 356 |
greg |
2.1 |
sundir[0] = -sin(azimuth)*cos(altitude); |
| 357 |
|
|
sundir[1] = -cos(azimuth)*cos(altitude); |
| 358 |
|
|
sundir[2] = sin(altitude); |
| 359 |
|
|
|
| 360 |
|
|
|
| 361 |
|
|
/* calculation for the new functions */ |
| 362 |
greg |
2.9 |
sunzenith = 90 - altitude*180/M_PI; |
| 363 |
greg |
2.1 |
|
| 364 |
|
|
|
| 365 |
|
|
|
| 366 |
greg |
2.9 |
/* compute the inputs for the calculation of the light distribution over the sky*/ |
| 367 |
greg |
2.1 |
if (input==0) |
| 368 |
|
|
{ |
| 369 |
|
|
check_parametrization(); |
| 370 |
greg |
2.9 |
diffuseirradiance = diffuse_irradiance_from_sky_brightness(); /*diffuse horizontal irradiance*/ |
| 371 |
greg |
2.1 |
directirradiance = direct_irradiance_from_sky_clearness(); |
| 372 |
|
|
check_irradiances(); |
| 373 |
|
|
|
| 374 |
|
|
if (output==0 || output==2) |
| 375 |
|
|
{ |
| 376 |
greg |
2.9 |
diffuseilluminance = diffuseirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
| 377 |
greg |
2.1 |
directilluminance = directirradiance*direct_n_effi_PEREZ(); |
| 378 |
|
|
check_illuminances(); |
| 379 |
|
|
} |
| 380 |
|
|
} |
| 381 |
|
|
|
| 382 |
|
|
|
| 383 |
|
|
else if (input==1) |
| 384 |
|
|
{ |
| 385 |
|
|
check_irradiances(); |
| 386 |
|
|
skybrightness = sky_brightness(); |
| 387 |
|
|
skyclearness = sky_clearness(); |
| 388 |
|
|
check_parametrization(); |
| 389 |
|
|
|
| 390 |
|
|
if (output==0 || output==2) |
| 391 |
|
|
{ |
| 392 |
greg |
2.9 |
diffuseilluminance = diffuseirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
| 393 |
greg |
2.1 |
directilluminance = directirradiance*direct_n_effi_PEREZ(); |
| 394 |
|
|
check_illuminances(); |
| 395 |
|
|
} |
| 396 |
|
|
|
| 397 |
|
|
} |
| 398 |
|
|
|
| 399 |
|
|
|
| 400 |
|
|
else if (input==2) |
| 401 |
|
|
{ |
| 402 |
|
|
check_illuminances(); |
| 403 |
|
|
illu_to_irra_index(); |
| 404 |
|
|
check_parametrization(); |
| 405 |
|
|
} |
| 406 |
|
|
|
| 407 |
|
|
|
| 408 |
|
|
else if (input==3) |
| 409 |
|
|
{ |
| 410 |
|
|
if (altitude<=0) |
| 411 |
|
|
{ |
| 412 |
greg |
2.9 |
if (suppress_warnings==0) |
| 413 |
|
|
fprintf(stderr, "Warning: solar zenith angle larger than 90 degrees; using zero irradiance to proceed\n"); |
| 414 |
|
|
directirradiance = 0; |
| 415 |
|
|
diffuseirradiance = 0; |
| 416 |
|
|
} else { |
| 417 |
|
|
directirradiance=directirradiance/sin(altitude); |
| 418 |
greg |
2.1 |
} |
| 419 |
|
|
check_irradiances(); |
| 420 |
|
|
skybrightness = sky_brightness(); |
| 421 |
|
|
skyclearness = sky_clearness(); |
| 422 |
|
|
check_parametrization(); |
| 423 |
|
|
|
| 424 |
|
|
if (output==0 || output==2) |
| 425 |
|
|
{ |
| 426 |
greg |
2.9 |
diffuseilluminance = diffuseirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
| 427 |
greg |
2.1 |
directilluminance = directirradiance*direct_n_effi_PEREZ(); |
| 428 |
|
|
check_illuminances(); |
| 429 |
|
|
} |
| 430 |
|
|
|
| 431 |
|
|
} |
| 432 |
|
|
|
| 433 |
|
|
|
| 434 |
|
|
else {fprintf(stderr,"error in giving the input arguments"); exit(1);} |
| 435 |
|
|
|
| 436 |
|
|
|
| 437 |
|
|
|
| 438 |
greg |
2.9 |
/* normalization factor for the relative sky luminance distribution, diffuse part*/ |
| 439 |
greg |
2.1 |
|
| 440 |
|
|
if ( (lv_mod = malloc(145*sizeof(float))) == NULL) |
| 441 |
|
|
{ |
| 442 |
|
|
fprintf(stderr,"Out of memory in function main"); |
| 443 |
|
|
exit(1); |
| 444 |
|
|
} |
| 445 |
|
|
|
| 446 |
|
|
/* read the angles */ |
| 447 |
greg |
2.9 |
theta_o = defangle_theta; |
| 448 |
|
|
phi_o = defangle_phi; |
| 449 |
greg |
2.1 |
|
| 450 |
greg |
2.9 |
/* parameters for the perez model */ |
| 451 |
greg |
2.1 |
coeff_lum_perez(radians(sunzenith), skyclearness, skybrightness, coeff_perez); |
| 452 |
|
|
|
| 453 |
greg |
2.9 |
/*calculation of the modelled luminance */ |
| 454 |
greg |
2.1 |
for (j=0;j<145;j++) |
| 455 |
|
|
{ |
| 456 |
|
|
theta_phi_to_dzeta_gamma(radians(*(theta_o+j)),radians(*(phi_o+j)),&dzeta,&gamma,radians(sunzenith)); |
| 457 |
|
|
*(lv_mod+j) = calc_rel_lum_perez(dzeta,gamma,radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 458 |
greg |
2.9 |
// printf("theta, phi, lv_mod %f\t %f\t %f\n", *(theta_o+j),*(phi_o+j),*(lv_mod+j)); |
| 459 |
greg |
2.1 |
} |
| 460 |
|
|
|
| 461 |
|
|
/* integration of luminance for the normalization factor, diffuse part of the sky*/ |
| 462 |
|
|
diffnormalization = integ_lv(lv_mod, theta_o); |
| 463 |
|
|
/*printf("perez integration %lf\n", diffnormalization);*/ |
| 464 |
|
|
|
| 465 |
|
|
|
| 466 |
|
|
|
| 467 |
|
|
|
| 468 |
greg |
2.9 |
/*normalization coefficient in lumen or in watt*/ |
| 469 |
greg |
2.1 |
if (output==0) |
| 470 |
|
|
{ |
| 471 |
greg |
2.9 |
diffnormalization = diffuseilluminance/diffnormalization/WHTEFFICACY; |
| 472 |
greg |
2.1 |
} |
| 473 |
|
|
else if (output==1) |
| 474 |
|
|
{ |
| 475 |
greg |
2.9 |
diffnormalization = diffuseirradiance/diffnormalization; |
| 476 |
greg |
2.1 |
} |
| 477 |
|
|
else if (output==2) |
| 478 |
|
|
{ |
| 479 |
greg |
2.9 |
diffnormalization = diffuseilluminance/diffnormalization; |
| 480 |
greg |
2.1 |
} |
| 481 |
|
|
|
| 482 |
greg |
2.9 |
else {fprintf(stderr,"Wrong output specification.\n"); exit(1);} |
| 483 |
greg |
2.1 |
|
| 484 |
|
|
|
| 485 |
|
|
|
| 486 |
|
|
|
| 487 |
greg |
2.9 |
/* calculation for the solar source */ |
| 488 |
greg |
2.1 |
if (output==0) |
| 489 |
greg |
2.9 |
solarradiance = directilluminance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180)))/WHTEFFICACY; |
| 490 |
greg |
2.1 |
|
| 491 |
|
|
else if (output==1) |
| 492 |
greg |
2.9 |
solarradiance = directirradiance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180))); |
| 493 |
greg |
2.1 |
|
| 494 |
|
|
else |
| 495 |
greg |
2.9 |
solarradiance = directilluminance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180))); |
| 496 |
greg |
2.1 |
|
| 497 |
|
|
|
| 498 |
|
|
|
| 499 |
|
|
|
| 500 |
|
|
/* Compute the ground radiance */ |
| 501 |
|
|
zenithbr=calc_rel_lum_perez(0.0,radians(sunzenith),radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 502 |
|
|
zenithbr*=diffnormalization; |
| 503 |
greg |
2.9 |
|
| 504 |
greg |
2.1 |
if (skyclearness==1) |
| 505 |
|
|
normfactor = 0.777778; |
| 506 |
|
|
|
| 507 |
|
|
if (skyclearness>=6) |
| 508 |
|
|
{ |
| 509 |
greg |
2.9 |
F2 = 0.274*(0.91 + 10.0*exp(-3.0*(M_PI/2.0-altitude)) + 0.45*sundir[2]*sundir[2]); |
| 510 |
|
|
normfactor = normsc()/F2/M_PI; |
| 511 |
greg |
2.1 |
} |
| 512 |
|
|
|
| 513 |
|
|
if ( (skyclearness>1) && (skyclearness<6) ) |
| 514 |
|
|
{ |
| 515 |
|
|
S_INTER=1; |
| 516 |
greg |
2.9 |
F2 = (2.739 + .9891*sin(.3119+2.6*altitude)) * exp(-(M_PI/2.0-altitude)*(.4441+1.48*altitude)); |
| 517 |
|
|
normfactor = normsc()/F2/M_PI; |
| 518 |
greg |
2.1 |
} |
| 519 |
|
|
|
| 520 |
|
|
groundbr = zenithbr*normfactor; |
| 521 |
|
|
|
| 522 |
|
|
if (dosun&&(skyclearness>1)) |
| 523 |
greg |
2.9 |
groundbr += 6.8e-5/M_PI*solarradiance*sundir[2]; |
| 524 |
greg |
2.1 |
|
| 525 |
|
|
groundbr *= gprefl; |
| 526 |
|
|
|
| 527 |
|
|
|
| 528 |
|
|
|
| 529 |
|
|
return; |
| 530 |
|
|
} |
| 531 |
|
|
|
| 532 |
|
|
|
| 533 |
|
|
|
| 534 |
|
|
|
| 535 |
greg |
2.9 |
void print_error_sky() |
| 536 |
|
|
{ |
| 537 |
|
|
sundir[0] = -sin(azimuth)*cos(altitude); |
| 538 |
|
|
sundir[1] = -cos(azimuth)*cos(altitude); |
| 539 |
|
|
sundir[2] = sin(altitude); |
| 540 |
|
|
|
| 541 |
|
|
printf("\nvoid brightfunc skyfunc\n"); |
| 542 |
|
|
printf("2 skybright perezlum.cal\n"); |
| 543 |
|
|
printf("0\n"); |
| 544 |
|
|
printf("10 0.00 0.00 0.000 0.000 0.000 0.000 0.000 %f %f %f \n", sundir[0], sundir[1], sundir[2]); |
| 545 |
|
|
} |
| 546 |
|
|
|
| 547 |
greg |
2.1 |
|
| 548 |
|
|
|
| 549 |
greg |
2.9 |
void printsky() /* print out sky */ |
| 550 |
greg |
2.1 |
{ |
| 551 |
|
|
if (dosun&&(skyclearness>1)) |
| 552 |
greg |
2.9 |
{ |
| 553 |
greg |
2.1 |
printf("\nvoid light solar\n"); |
| 554 |
|
|
printf("0\n0\n"); |
| 555 |
|
|
printf("3 %.3e %.3e %.3e\n", solarradiance, solarradiance, solarradiance); |
| 556 |
|
|
printf("\nsolar source sun\n"); |
| 557 |
|
|
printf("0\n0\n"); |
| 558 |
|
|
printf("4 %f %f %f %f\n", sundir[0], sundir[1], sundir[2], 2*half_sun_angle); |
| 559 |
greg |
2.9 |
} else if (dosun) { |
| 560 |
greg |
2.1 |
printf("\nvoid light solar\n"); |
| 561 |
|
|
printf("0\n0\n"); |
| 562 |
|
|
printf("3 0.0 0.0 0.0\n"); |
| 563 |
|
|
printf("\nsolar source sun\n"); |
| 564 |
|
|
printf("0\n0\n"); |
| 565 |
|
|
printf("4 %f %f %f %f\n", sundir[0], sundir[1], sundir[2], 2*half_sun_angle); |
| 566 |
greg |
2.9 |
} |
| 567 |
greg |
2.1 |
|
| 568 |
|
|
printf("\nvoid brightfunc skyfunc\n"); |
| 569 |
|
|
printf("2 skybright perezlum.cal\n"); |
| 570 |
|
|
printf("0\n"); |
| 571 |
|
|
printf("10 %.3e %.3e %lf %lf %lf %lf %lf %f %f %f \n", diffnormalization, groundbr, |
| 572 |
greg |
2.9 |
*(c_perez+0),*(c_perez+1),*(c_perez+2),*(c_perez+3),*(c_perez+4), |
| 573 |
|
|
sundir[0], sundir[1], sundir[2]); |
| 574 |
greg |
2.1 |
} |
| 575 |
|
|
|
| 576 |
|
|
|
| 577 |
greg |
2.9 |
void printdefaults() /* print default values */ |
| 578 |
greg |
2.1 |
{ |
| 579 |
|
|
printf("-g %f\t\t\t# Ground plane reflectance\n", gprefl); |
| 580 |
|
|
if (zenithbr > 0.0) |
| 581 |
|
|
printf("-b %f\t\t\t# Zenith radiance (watts/ster/m^2\n", zenithbr); |
| 582 |
|
|
else |
| 583 |
|
|
printf("-t %f\t\t\t# Atmospheric betaturbidity\n", betaturbidity); |
| 584 |
greg |
2.9 |
printf("-a %f\t\t\t# Site latitude (degrees)\n", s_latitude*(180/M_PI)); |
| 585 |
|
|
printf("-o %f\t\t\t# Site longitude (degrees)\n", s_longitude*(180/M_PI)); |
| 586 |
|
|
printf("-m %f\t\t\t# Standard meridian (degrees)\n", s_meridian*(180/M_PI)); |
| 587 |
greg |
2.1 |
} |
| 588 |
|
|
|
| 589 |
|
|
|
| 590 |
greg |
2.9 |
void userror(char* msg) /* print usage error and quit */ |
| 591 |
greg |
2.1 |
{ |
| 592 |
|
|
if (msg != NULL) |
| 593 |
|
|
fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
| 594 |
greg |
2.9 |
fprintf(stderr, "Usage: %s month day hour [-P|-W|-L|-G] direct_value diffuse_value [options]\n", progname); |
| 595 |
|
|
fprintf(stderr, "or: %s -ang altitude azimuth [-P|-W|-L|-G] direct_value diffuse_value [options]\n", progname); |
| 596 |
greg |
2.1 |
fprintf(stderr, " -P epsilon delta (these are the Perez parameters) \n"); |
| 597 |
|
|
fprintf(stderr, " -W direct-normal-irradiance diffuse-horizontal-irradiance (W/m^2)\n"); |
| 598 |
|
|
fprintf(stderr, " -L direct-normal-illuminance diffuse-horizontal-illuminance (lux)\n"); |
| 599 |
|
|
fprintf(stderr, " -G direct-horizontal-irradiance diffuse-horizontal-irradiance (W/m^2)\n"); |
| 600 |
|
|
fprintf(stderr, " -O [0|1|2] (0=output in W/m^2/sr visible, 1=output in W/m^2/sr solar, 2=output in candela/m^2), default is 0 \n"); |
| 601 |
greg |
2.9 |
fprintf(stderr, " gendaylit version 2.00 (2013/01/28) \n"); |
| 602 |
greg |
2.1 |
exit(1); |
| 603 |
|
|
} |
| 604 |
|
|
|
| 605 |
|
|
|
| 606 |
|
|
|
| 607 |
greg |
2.9 |
double normsc() /* compute normalization factor (E0*F2/L0) */ |
| 608 |
greg |
2.1 |
{ |
| 609 |
|
|
static double nfc[2][5] = { |
| 610 |
|
|
/* clear sky approx. */ |
| 611 |
|
|
{2.766521, 0.547665, -0.369832, 0.009237, 0.059229}, |
| 612 |
|
|
/* intermediate sky approx. */ |
| 613 |
|
|
{3.5556, -2.7152, -1.3081, 1.0660, 0.60227}, |
| 614 |
|
|
}; |
| 615 |
|
|
register double *nf; |
| 616 |
|
|
double x, nsc; |
| 617 |
|
|
register int i; |
| 618 |
|
|
/* polynomial approximation */ |
| 619 |
|
|
nf = nfc[S_INTER]; |
| 620 |
greg |
2.9 |
x = (altitude - M_PI/4.0)/(M_PI/4.0); |
| 621 |
greg |
2.1 |
nsc = nf[i=4]; |
| 622 |
|
|
while (i--) |
| 623 |
|
|
nsc = nsc*x + nf[i]; |
| 624 |
|
|
|
| 625 |
|
|
return(nsc); |
| 626 |
|
|
} |
| 627 |
|
|
|
| 628 |
|
|
|
| 629 |
|
|
|
| 630 |
greg |
2.9 |
void printhead(int ac, char** av) /* print command header */ |
| 631 |
greg |
2.1 |
{ |
| 632 |
|
|
putchar('#'); |
| 633 |
|
|
while (ac--) { |
| 634 |
|
|
putchar(' '); |
| 635 |
|
|
fputs(*av++, stdout); |
| 636 |
|
|
} |
| 637 |
|
|
putchar('\n'); |
| 638 |
|
|
} |
| 639 |
|
|
|
| 640 |
|
|
|
| 641 |
|
|
|
| 642 |
|
|
|
| 643 |
|
|
|
| 644 |
|
|
|
| 645 |
|
|
/* Perez models */ |
| 646 |
|
|
|
| 647 |
|
|
/* Perez global horizontal luminous efficacy model */ |
| 648 |
|
|
double glob_h_effi_PEREZ() |
| 649 |
|
|
{ |
| 650 |
|
|
|
| 651 |
|
|
double value; |
| 652 |
|
|
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 653 |
|
|
int category_total_number, category_number, i; |
| 654 |
|
|
|
| 655 |
|
|
|
| 656 |
greg |
2.9 |
if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 657 |
|
|
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_effi_PEREZ \n"); |
| 658 |
greg |
2.1 |
|
| 659 |
|
|
/* initialize category bounds (clearness index bounds) */ |
| 660 |
|
|
|
| 661 |
|
|
category_total_number = 8; |
| 662 |
|
|
|
| 663 |
|
|
category_bounds[1] = 1; |
| 664 |
|
|
category_bounds[2] = 1.065; |
| 665 |
|
|
category_bounds[3] = 1.230; |
| 666 |
|
|
category_bounds[4] = 1.500; |
| 667 |
|
|
category_bounds[5] = 1.950; |
| 668 |
|
|
category_bounds[6] = 2.800; |
| 669 |
|
|
category_bounds[7] = 4.500; |
| 670 |
|
|
category_bounds[8] = 6.200; |
| 671 |
|
|
category_bounds[9] = 12.01; |
| 672 |
|
|
|
| 673 |
|
|
|
| 674 |
|
|
/* initialize model coefficients */ |
| 675 |
|
|
a[1] = 96.63; |
| 676 |
|
|
a[2] = 107.54; |
| 677 |
|
|
a[3] = 98.73; |
| 678 |
|
|
a[4] = 92.72; |
| 679 |
|
|
a[5] = 86.73; |
| 680 |
|
|
a[6] = 88.34; |
| 681 |
|
|
a[7] = 78.63; |
| 682 |
|
|
a[8] = 99.65; |
| 683 |
|
|
|
| 684 |
|
|
b[1] = -0.47; |
| 685 |
|
|
b[2] = 0.79; |
| 686 |
|
|
b[3] = 0.70; |
| 687 |
|
|
b[4] = 0.56; |
| 688 |
|
|
b[5] = 0.98; |
| 689 |
|
|
b[6] = 1.39; |
| 690 |
|
|
b[7] = 1.47; |
| 691 |
|
|
b[8] = 1.86; |
| 692 |
|
|
|
| 693 |
|
|
c[1] = 11.50; |
| 694 |
|
|
c[2] = 1.79; |
| 695 |
|
|
c[3] = 4.40; |
| 696 |
|
|
c[4] = 8.36; |
| 697 |
|
|
c[5] = 7.10; |
| 698 |
|
|
c[6] = 6.06; |
| 699 |
|
|
c[7] = 4.93; |
| 700 |
|
|
c[8] = -4.46; |
| 701 |
|
|
|
| 702 |
|
|
d[1] = -9.16; |
| 703 |
|
|
d[2] = -1.19; |
| 704 |
|
|
d[3] = -6.95; |
| 705 |
|
|
d[4] = -8.31; |
| 706 |
|
|
d[5] = -10.94; |
| 707 |
|
|
d[6] = -7.60; |
| 708 |
|
|
d[7] = -11.37; |
| 709 |
|
|
d[8] = -3.15; |
| 710 |
|
|
|
| 711 |
|
|
|
| 712 |
|
|
|
| 713 |
|
|
|
| 714 |
|
|
for (i=1; i<=category_total_number; i++) |
| 715 |
|
|
{ |
| 716 |
|
|
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 717 |
|
|
category_number = i; |
| 718 |
|
|
} |
| 719 |
|
|
|
| 720 |
|
|
value = a[category_number] + b[category_number]*atm_preci_water + |
| 721 |
greg |
2.9 |
c[category_number]*cos(sunzenith*M_PI/180) + d[category_number]*log(skybrightness); |
| 722 |
greg |
2.1 |
|
| 723 |
|
|
return(value); |
| 724 |
|
|
} |
| 725 |
|
|
|
| 726 |
|
|
|
| 727 |
|
|
/* global horizontal diffuse efficacy model, according to PEREZ */ |
| 728 |
|
|
double glob_h_diffuse_effi_PEREZ() |
| 729 |
|
|
{ |
| 730 |
|
|
double value; |
| 731 |
|
|
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 732 |
|
|
int category_total_number, category_number, i; |
| 733 |
|
|
|
| 734 |
|
|
|
| 735 |
greg |
2.9 |
if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 736 |
|
|
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_diffuse_effi_PEREZ \n"); |
| 737 |
greg |
2.1 |
|
| 738 |
|
|
/* initialize category bounds (clearness index bounds) */ |
| 739 |
|
|
|
| 740 |
|
|
category_total_number = 8; |
| 741 |
|
|
|
| 742 |
greg |
2.9 |
//XXX: category_bounds > 0.1 |
| 743 |
greg |
2.1 |
category_bounds[1] = 1; |
| 744 |
|
|
category_bounds[2] = 1.065; |
| 745 |
|
|
category_bounds[3] = 1.230; |
| 746 |
|
|
category_bounds[4] = 1.500; |
| 747 |
|
|
category_bounds[5] = 1.950; |
| 748 |
|
|
category_bounds[6] = 2.800; |
| 749 |
|
|
category_bounds[7] = 4.500; |
| 750 |
|
|
category_bounds[8] = 6.200; |
| 751 |
|
|
category_bounds[9] = 12.01; |
| 752 |
|
|
|
| 753 |
|
|
|
| 754 |
|
|
/* initialize model coefficients */ |
| 755 |
|
|
a[1] = 97.24; |
| 756 |
|
|
a[2] = 107.22; |
| 757 |
|
|
a[3] = 104.97; |
| 758 |
|
|
a[4] = 102.39; |
| 759 |
|
|
a[5] = 100.71; |
| 760 |
|
|
a[6] = 106.42; |
| 761 |
|
|
a[7] = 141.88; |
| 762 |
|
|
a[8] = 152.23; |
| 763 |
|
|
|
| 764 |
|
|
b[1] = -0.46; |
| 765 |
|
|
b[2] = 1.15; |
| 766 |
|
|
b[3] = 2.96; |
| 767 |
|
|
b[4] = 5.59; |
| 768 |
|
|
b[5] = 5.94; |
| 769 |
|
|
b[6] = 3.83; |
| 770 |
|
|
b[7] = 1.90; |
| 771 |
|
|
b[8] = 0.35; |
| 772 |
|
|
|
| 773 |
|
|
c[1] = 12.00; |
| 774 |
|
|
c[2] = 0.59; |
| 775 |
|
|
c[3] = -5.53; |
| 776 |
|
|
c[4] = -13.95; |
| 777 |
|
|
c[5] = -22.75; |
| 778 |
|
|
c[6] = -36.15; |
| 779 |
|
|
c[7] = -53.24; |
| 780 |
|
|
c[8] = -45.27; |
| 781 |
|
|
|
| 782 |
|
|
d[1] = -8.91; |
| 783 |
|
|
d[2] = -3.95; |
| 784 |
|
|
d[3] = -8.77; |
| 785 |
|
|
d[4] = -13.90; |
| 786 |
|
|
d[5] = -23.74; |
| 787 |
|
|
d[6] = -28.83; |
| 788 |
|
|
d[7] = -14.03; |
| 789 |
|
|
d[8] = -7.98; |
| 790 |
|
|
|
| 791 |
|
|
|
| 792 |
|
|
|
| 793 |
|
|
|
| 794 |
greg |
2.9 |
category_number = -1; |
| 795 |
greg |
2.1 |
for (i=1; i<=category_total_number; i++) |
| 796 |
|
|
{ |
| 797 |
|
|
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 798 |
|
|
category_number = i; |
| 799 |
|
|
} |
| 800 |
|
|
|
| 801 |
greg |
2.9 |
if (category_number == -1) { |
| 802 |
|
|
if (suppress_warnings==0) |
| 803 |
|
|
fprintf(stderr, "ERROR: Model parameters out of range\n"); |
| 804 |
|
|
print_error_sky(); |
| 805 |
|
|
exit(1); |
| 806 |
|
|
} |
| 807 |
|
|
|
| 808 |
|
|
|
| 809 |
|
|
value = a[category_number] + b[category_number]*atm_preci_water + c[category_number]*cos(sunzenith*M_PI/180) + |
| 810 |
greg |
2.1 |
d[category_number]*log(skybrightness); |
| 811 |
|
|
|
| 812 |
|
|
return(value); |
| 813 |
|
|
} |
| 814 |
|
|
|
| 815 |
|
|
|
| 816 |
|
|
/* direct normal efficacy model, according to PEREZ */ |
| 817 |
|
|
|
| 818 |
|
|
double direct_n_effi_PEREZ() |
| 819 |
|
|
|
| 820 |
|
|
{ |
| 821 |
|
|
double value; |
| 822 |
|
|
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 823 |
|
|
int category_total_number, category_number, i; |
| 824 |
|
|
|
| 825 |
|
|
|
| 826 |
greg |
2.9 |
if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 827 |
|
|
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function direct_n_effi_PEREZ \n"); |
| 828 |
greg |
2.1 |
|
| 829 |
|
|
|
| 830 |
|
|
/* initialize category bounds (clearness index bounds) */ |
| 831 |
|
|
|
| 832 |
|
|
category_total_number = 8; |
| 833 |
|
|
|
| 834 |
|
|
category_bounds[1] = 1; |
| 835 |
|
|
category_bounds[2] = 1.065; |
| 836 |
|
|
category_bounds[3] = 1.230; |
| 837 |
|
|
category_bounds[4] = 1.500; |
| 838 |
|
|
category_bounds[5] = 1.950; |
| 839 |
|
|
category_bounds[6] = 2.800; |
| 840 |
|
|
category_bounds[7] = 4.500; |
| 841 |
|
|
category_bounds[8] = 6.200; |
| 842 |
|
|
category_bounds[9] = 12.1; |
| 843 |
|
|
|
| 844 |
|
|
|
| 845 |
|
|
/* initialize model coefficients */ |
| 846 |
|
|
a[1] = 57.20; |
| 847 |
|
|
a[2] = 98.99; |
| 848 |
|
|
a[3] = 109.83; |
| 849 |
|
|
a[4] = 110.34; |
| 850 |
|
|
a[5] = 106.36; |
| 851 |
|
|
a[6] = 107.19; |
| 852 |
|
|
a[7] = 105.75; |
| 853 |
|
|
a[8] = 101.18; |
| 854 |
|
|
|
| 855 |
|
|
b[1] = -4.55; |
| 856 |
|
|
b[2] = -3.46; |
| 857 |
|
|
b[3] = -4.90; |
| 858 |
|
|
b[4] = -5.84; |
| 859 |
|
|
b[5] = -3.97; |
| 860 |
|
|
b[6] = -1.25; |
| 861 |
|
|
b[7] = 0.77; |
| 862 |
|
|
b[8] = 1.58; |
| 863 |
|
|
|
| 864 |
|
|
c[1] = -2.98; |
| 865 |
|
|
c[2] = -1.21; |
| 866 |
|
|
c[3] = -1.71; |
| 867 |
|
|
c[4] = -1.99; |
| 868 |
|
|
c[5] = -1.75; |
| 869 |
|
|
c[6] = -1.51; |
| 870 |
|
|
c[7] = -1.26; |
| 871 |
|
|
c[8] = -1.10; |
| 872 |
|
|
|
| 873 |
|
|
d[1] = 117.12; |
| 874 |
|
|
d[2] = 12.38; |
| 875 |
|
|
d[3] = -8.81; |
| 876 |
|
|
d[4] = -4.56; |
| 877 |
|
|
d[5] = -6.16; |
| 878 |
|
|
d[6] = -26.73; |
| 879 |
|
|
d[7] = -34.44; |
| 880 |
|
|
d[8] = -8.29; |
| 881 |
|
|
|
| 882 |
|
|
|
| 883 |
|
|
|
| 884 |
|
|
for (i=1; i<=category_total_number; i++) |
| 885 |
|
|
{ |
| 886 |
|
|
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 887 |
|
|
category_number = i; |
| 888 |
|
|
} |
| 889 |
|
|
|
| 890 |
greg |
2.9 |
value = a[category_number] + b[category_number]*atm_preci_water + c[category_number]*exp(5.73*sunzenith*M_PI/180 - 5) + d[category_number]*skybrightness; |
| 891 |
greg |
2.1 |
|
| 892 |
|
|
if (value < 0) value = 0; |
| 893 |
|
|
|
| 894 |
|
|
return(value); |
| 895 |
|
|
} |
| 896 |
|
|
|
| 897 |
|
|
|
| 898 |
|
|
/*check the range of epsilon and delta indexes of the perez parametrization*/ |
| 899 |
|
|
void check_parametrization() |
| 900 |
|
|
{ |
| 901 |
greg |
2.9 |
if (skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) |
| 902 |
greg |
2.1 |
{ |
| 903 |
greg |
2.9 |
|
| 904 |
|
|
/* limit sky clearness or sky brightness, 2009 11 13 by J. Wienold */ |
| 905 |
|
|
if (skyclearness<skyclearinf){ |
| 906 |
|
|
skyclearness=skyclearinf; |
| 907 |
|
|
if (suppress_warnings==0) |
| 908 |
|
|
fprintf(stderr,"Range warning: sky clearness too low (%lf)\n", skyclearness); |
| 909 |
|
|
} |
| 910 |
|
|
if (skyclearness>skyclearsup){ |
| 911 |
|
|
skyclearness=skyclearsup-0.1; |
| 912 |
|
|
if (suppress_warnings==0) |
| 913 |
|
|
fprintf(stderr,"Range warning: sky clearness too high (%lf)\n", skyclearness); |
| 914 |
|
|
} |
| 915 |
|
|
if (skybrightness<skybriginf){ |
| 916 |
|
|
skybrightness=skybriginf; |
| 917 |
|
|
if (suppress_warnings==0) |
| 918 |
|
|
fprintf(stderr,"Range warning: sky brightness too low (%lf)\n", skybrightness); |
| 919 |
|
|
} |
| 920 |
|
|
if (skybrightness>skybrigsup){ |
| 921 |
|
|
skybrightness=skybrigsup; |
| 922 |
|
|
if (suppress_warnings==0) |
| 923 |
|
|
fprintf(stderr,"Range warning: sky brightness too high (%lf)\n", skybrightness); |
| 924 |
greg |
2.1 |
} |
| 925 |
greg |
2.9 |
|
| 926 |
|
|
return; } |
| 927 |
greg |
2.1 |
else return; |
| 928 |
|
|
} |
| 929 |
|
|
|
| 930 |
|
|
|
| 931 |
greg |
2.9 |
/* validity of the direct and diffuse components */ |
| 932 |
greg |
2.1 |
void check_illuminances() |
| 933 |
|
|
{ |
| 934 |
greg |
2.9 |
if (directilluminance < 0) { |
| 935 |
|
|
fprintf(stderr,"WARNING: direct illuminance < 0. Using 0.0\n"); |
| 936 |
|
|
directilluminance = 0.0; |
| 937 |
|
|
} |
| 938 |
|
|
if (diffuseilluminance < 0) { |
| 939 |
|
|
fprintf(stderr,"WARNING: diffuse illuminance < 0. Using 0.0\n"); |
| 940 |
|
|
diffuseilluminance = 0.0; |
| 941 |
|
|
} |
| 942 |
|
|
if (directilluminance > solar_constant_l*1000.0) { |
| 943 |
|
|
fprintf(stderr,"ERROR: direct illuminance exceeds solar constant\n"); |
| 944 |
|
|
exit(1); |
| 945 |
greg |
2.1 |
} |
| 946 |
|
|
} |
| 947 |
|
|
|
| 948 |
|
|
|
| 949 |
|
|
void check_irradiances() |
| 950 |
|
|
{ |
| 951 |
greg |
2.9 |
if (directirradiance < 0) { |
| 952 |
|
|
fprintf(stderr,"WARNING: direct irradiance < 0. Using 0.0\n"); |
| 953 |
|
|
directirradiance = 0.0; |
| 954 |
|
|
} |
| 955 |
|
|
if (diffuseirradiance < 0) { |
| 956 |
|
|
fprintf(stderr,"WARNING: diffuse irradiance < 0. Using 0.0\n"); |
| 957 |
|
|
diffuseirradiance = 0.0; |
| 958 |
|
|
} |
| 959 |
|
|
if (directirradiance > solar_constant_e) { |
| 960 |
|
|
fprintf(stderr,"ERROR: direct irradiance exceeds solar constant\n"); |
| 961 |
|
|
exit(1); |
| 962 |
|
|
} |
| 963 |
greg |
2.1 |
} |
| 964 |
|
|
|
| 965 |
|
|
|
| 966 |
|
|
|
| 967 |
|
|
/* Perez sky's brightness */ |
| 968 |
|
|
double sky_brightness() |
| 969 |
|
|
{ |
| 970 |
|
|
double value; |
| 971 |
|
|
|
| 972 |
greg |
2.9 |
value = diffuseirradiance * air_mass() / ( solar_constant_e*get_eccentricity()); |
| 973 |
greg |
2.1 |
|
| 974 |
|
|
return(value); |
| 975 |
|
|
} |
| 976 |
|
|
|
| 977 |
|
|
|
| 978 |
|
|
/* Perez sky's clearness */ |
| 979 |
|
|
double sky_clearness() |
| 980 |
|
|
{ |
| 981 |
greg |
2.9 |
double value; |
| 982 |
greg |
2.1 |
|
| 983 |
greg |
2.9 |
value = ( (diffuseirradiance + directirradiance)/(diffuseirradiance) + 1.041*sunzenith*M_PI/180*sunzenith*M_PI/180*sunzenith*M_PI/180 ) / (1 + 1.041*sunzenith*M_PI/180*sunzenith*M_PI/180*sunzenith*M_PI/180) ; |
| 984 |
greg |
2.1 |
|
| 985 |
greg |
2.9 |
return(value); |
| 986 |
greg |
2.1 |
} |
| 987 |
|
|
|
| 988 |
|
|
|
| 989 |
|
|
|
| 990 |
|
|
/* diffus horizontal irradiance from Perez sky's brightness */ |
| 991 |
greg |
2.9 |
double diffuse_irradiance_from_sky_brightness() |
| 992 |
greg |
2.1 |
{ |
| 993 |
|
|
double value; |
| 994 |
|
|
|
| 995 |
|
|
value = skybrightness / air_mass() * ( solar_constant_e*get_eccentricity()); |
| 996 |
|
|
|
| 997 |
|
|
return(value); |
| 998 |
|
|
} |
| 999 |
|
|
|
| 1000 |
|
|
|
| 1001 |
|
|
/* direct normal irradiance from Perez sky's clearness */ |
| 1002 |
|
|
double direct_irradiance_from_sky_clearness() |
| 1003 |
|
|
{ |
| 1004 |
|
|
double value; |
| 1005 |
|
|
|
| 1006 |
greg |
2.9 |
value = diffuse_irradiance_from_sky_brightness(); |
| 1007 |
|
|
value = value * ( (skyclearness-1) * (1+1.041*sunzenith*M_PI/180*sunzenith*M_PI/180*sunzenith*M_PI/180) ); |
| 1008 |
greg |
2.1 |
|
| 1009 |
|
|
return(value); |
| 1010 |
|
|
} |
| 1011 |
|
|
|
| 1012 |
|
|
|
| 1013 |
greg |
2.9 |
void illu_to_irra_index() |
| 1014 |
greg |
2.1 |
{ |
| 1015 |
greg |
2.9 |
double test1=0.1, test2=0.1, d_eff; |
| 1016 |
greg |
2.1 |
int counter=0; |
| 1017 |
|
|
|
| 1018 |
greg |
2.9 |
diffuseirradiance = diffuseilluminance*solar_constant_e/(solar_constant_l*1000); |
| 1019 |
greg |
2.1 |
directirradiance = directilluminance*solar_constant_e/(solar_constant_l*1000); |
| 1020 |
|
|
skyclearness = sky_clearness(); |
| 1021 |
|
|
skybrightness = sky_brightness(); |
| 1022 |
greg |
2.9 |
check_parametrization(); |
| 1023 |
greg |
2.1 |
|
| 1024 |
greg |
2.9 |
while ( ((fabs(diffuseirradiance-test1)>10) || (fabs(directirradiance-test2)>10) |
| 1025 |
greg |
2.1 |
|| skyclearness>skyclearinf || skyclearness<skyclearsup |
| 1026 |
|
|
|| skybrightness>skybriginf || skybrightness<skybrigsup ) |
| 1027 |
|
|
&& !(counter==5) ) |
| 1028 |
|
|
{ |
| 1029 |
|
|
|
| 1030 |
greg |
2.9 |
test1=diffuseirradiance; |
| 1031 |
greg |
2.1 |
test2=directirradiance; |
| 1032 |
|
|
counter++; |
| 1033 |
|
|
|
| 1034 |
greg |
2.9 |
diffuseirradiance = diffuseilluminance/glob_h_diffuse_effi_PEREZ(); |
| 1035 |
|
|
d_eff = direct_n_effi_PEREZ(); |
| 1036 |
|
|
if (d_eff < 0.1) |
| 1037 |
|
|
directirradiance = 0; |
| 1038 |
|
|
else |
| 1039 |
|
|
directirradiance = directilluminance/d_eff; |
| 1040 |
greg |
2.1 |
|
| 1041 |
|
|
skybrightness = sky_brightness(); |
| 1042 |
|
|
skyclearness = sky_clearness(); |
| 1043 |
greg |
2.9 |
check_parametrization(); |
| 1044 |
|
|
|
| 1045 |
greg |
2.1 |
} |
| 1046 |
|
|
|
| 1047 |
|
|
|
| 1048 |
|
|
return; |
| 1049 |
|
|
} |
| 1050 |
|
|
|
| 1051 |
greg |
2.9 |
static int get_numlin(float epsilon) |
| 1052 |
greg |
2.1 |
{ |
| 1053 |
greg |
2.9 |
if (epsilon < 1.065) |
| 1054 |
|
|
return 0; |
| 1055 |
|
|
else if (epsilon < 1.230) |
| 1056 |
|
|
return 1; |
| 1057 |
|
|
else if (epsilon < 1.500) |
| 1058 |
|
|
return 2; |
| 1059 |
|
|
else if (epsilon < 1.950) |
| 1060 |
|
|
return 3; |
| 1061 |
|
|
else if (epsilon < 2.800) |
| 1062 |
|
|
return 4; |
| 1063 |
|
|
else if (epsilon < 4.500) |
| 1064 |
|
|
return 5; |
| 1065 |
|
|
else if (epsilon < 6.200) |
| 1066 |
|
|
return 6; |
| 1067 |
|
|
return 7; |
| 1068 |
greg |
2.1 |
} |
| 1069 |
|
|
|
| 1070 |
|
|
/* sky luminance perez model */ |
| 1071 |
greg |
2.9 |
double calc_rel_lum_perez(double dzeta,double gamma,double Z,double epsilon,double Delta,float coeff_perez[]) |
| 1072 |
greg |
2.1 |
{ |
| 1073 |
|
|
float x[5][4]; |
| 1074 |
|
|
int i,j,num_lin; |
| 1075 |
|
|
double c_perez[5]; |
| 1076 |
|
|
|
| 1077 |
|
|
if ( (epsilon < skyclearinf) || (epsilon >= skyclearsup) ) |
| 1078 |
|
|
{ |
| 1079 |
greg |
2.9 |
fprintf(stderr,"Epsilon out of range in function calc_rel_lum_perez!\n"); |
| 1080 |
greg |
2.1 |
exit(1); |
| 1081 |
|
|
} |
| 1082 |
|
|
|
| 1083 |
|
|
/* correction de modele de Perez solar energy ...*/ |
| 1084 |
|
|
if ( (epsilon > 1.065) && (epsilon < 2.8) ) |
| 1085 |
|
|
{ |
| 1086 |
|
|
if ( Delta < 0.2 ) Delta = 0.2; |
| 1087 |
|
|
} |
| 1088 |
|
|
|
| 1089 |
greg |
2.9 |
num_lin = get_numlin(epsilon); |
| 1090 |
greg |
2.1 |
|
| 1091 |
|
|
for (i=0;i<5;i++) |
| 1092 |
|
|
for (j=0;j<4;j++) |
| 1093 |
|
|
{ |
| 1094 |
|
|
x[i][j] = *(coeff_perez + 20*num_lin + 4*i +j); |
| 1095 |
|
|
/* printf("x %d %d vaut %f\n",i,j,x[i][j]); */ |
| 1096 |
|
|
} |
| 1097 |
|
|
|
| 1098 |
|
|
|
| 1099 |
|
|
if (num_lin) |
| 1100 |
|
|
{ |
| 1101 |
|
|
for (i=0;i<5;i++) |
| 1102 |
|
|
c_perez[i] = x[i][0] + x[i][1]*Z + Delta * (x[i][2] + x[i][3]*Z); |
| 1103 |
|
|
} |
| 1104 |
|
|
else |
| 1105 |
|
|
{ |
| 1106 |
|
|
c_perez[0] = x[0][0] + x[0][1]*Z + Delta * (x[0][2] + x[0][3]*Z); |
| 1107 |
|
|
c_perez[1] = x[1][0] + x[1][1]*Z + Delta * (x[1][2] + x[1][3]*Z); |
| 1108 |
|
|
c_perez[4] = x[4][0] + x[4][1]*Z + Delta * (x[4][2] + x[4][3]*Z); |
| 1109 |
|
|
c_perez[2] = exp( pow(Delta*(x[2][0]+x[2][1]*Z),x[2][2])) - x[2][3]; |
| 1110 |
|
|
c_perez[3] = -exp( Delta*(x[3][0]+x[3][1]*Z) )+x[3][2]+Delta*x[3][3]; |
| 1111 |
|
|
} |
| 1112 |
|
|
|
| 1113 |
|
|
|
| 1114 |
|
|
return (1 + c_perez[0]*exp(c_perez[1]/cos(dzeta)) ) * |
| 1115 |
|
|
(1 + c_perez[2]*exp(c_perez[3]*gamma) + |
| 1116 |
|
|
c_perez[4]*cos(gamma)*cos(gamma) ); |
| 1117 |
|
|
} |
| 1118 |
|
|
|
| 1119 |
|
|
|
| 1120 |
|
|
|
| 1121 |
|
|
/* coefficients for the sky luminance perez model */ |
| 1122 |
greg |
2.9 |
void coeff_lum_perez(double Z, double epsilon, double Delta, float coeff_perez[]) |
| 1123 |
greg |
2.1 |
{ |
| 1124 |
|
|
float x[5][4]; |
| 1125 |
|
|
int i,j,num_lin; |
| 1126 |
|
|
|
| 1127 |
|
|
if ( (epsilon < skyclearinf) || (epsilon >= skyclearsup) ) |
| 1128 |
|
|
{ |
| 1129 |
|
|
fprintf(stderr,"Epsilon out of range in function calc_rel_lum_perez !\n"); |
| 1130 |
|
|
exit(1); |
| 1131 |
|
|
} |
| 1132 |
|
|
|
| 1133 |
|
|
/* correction du modele de Perez solar energy ...*/ |
| 1134 |
|
|
if ( (epsilon > 1.065) && (epsilon < 2.8) ) |
| 1135 |
|
|
{ |
| 1136 |
|
|
if ( Delta < 0.2 ) Delta = 0.2; |
| 1137 |
|
|
} |
| 1138 |
|
|
|
| 1139 |
greg |
2.9 |
num_lin = get_numlin(epsilon); |
| 1140 |
|
|
|
| 1141 |
|
|
//fprintf(stderr,"numlin %d\n", num_lin); |
| 1142 |
greg |
2.1 |
|
| 1143 |
|
|
for (i=0;i<5;i++) |
| 1144 |
|
|
for (j=0;j<4;j++) |
| 1145 |
|
|
{ |
| 1146 |
|
|
x[i][j] = *(coeff_perez + 20*num_lin + 4*i +j); |
| 1147 |
|
|
/* printf("x %d %d vaut %f\n",i,j,x[i][j]); */ |
| 1148 |
|
|
} |
| 1149 |
|
|
|
| 1150 |
|
|
|
| 1151 |
|
|
if (num_lin) |
| 1152 |
|
|
{ |
| 1153 |
|
|
for (i=0;i<5;i++) |
| 1154 |
|
|
*(c_perez+i) = x[i][0] + x[i][1]*Z + Delta * (x[i][2] + x[i][3]*Z); |
| 1155 |
|
|
|
| 1156 |
|
|
} |
| 1157 |
|
|
else |
| 1158 |
|
|
{ |
| 1159 |
|
|
*(c_perez+0) = x[0][0] + x[0][1]*Z + Delta * (x[0][2] + x[0][3]*Z); |
| 1160 |
|
|
*(c_perez+1) = x[1][0] + x[1][1]*Z + Delta * (x[1][2] + x[1][3]*Z); |
| 1161 |
|
|
*(c_perez+4) = x[4][0] + x[4][1]*Z + Delta * (x[4][2] + x[4][3]*Z); |
| 1162 |
|
|
*(c_perez+2) = exp( pow(Delta*(x[2][0]+x[2][1]*Z),x[2][2])) - x[2][3]; |
| 1163 |
|
|
*(c_perez+3) = -exp( Delta*(x[3][0]+x[3][1]*Z) )+x[3][2]+Delta*x[3][3]; |
| 1164 |
|
|
|
| 1165 |
|
|
|
| 1166 |
|
|
} |
| 1167 |
|
|
|
| 1168 |
|
|
|
| 1169 |
|
|
return; |
| 1170 |
|
|
} |
| 1171 |
|
|
|
| 1172 |
|
|
|
| 1173 |
|
|
/* degrees into radians */ |
| 1174 |
|
|
double radians(double degres) |
| 1175 |
|
|
{ |
| 1176 |
greg |
2.9 |
return degres*M_PI/180.0; |
| 1177 |
greg |
2.1 |
} |
| 1178 |
|
|
|
| 1179 |
|
|
/* radian into degrees */ |
| 1180 |
|
|
double degres(double radians) |
| 1181 |
|
|
{ |
| 1182 |
greg |
2.9 |
return radians/M_PI*180.0; |
| 1183 |
greg |
2.1 |
} |
| 1184 |
|
|
|
| 1185 |
|
|
/* calculation of the angles dzeta and gamma */ |
| 1186 |
|
|
void theta_phi_to_dzeta_gamma(double theta,double phi,double *dzeta,double *gamma, double Z) |
| 1187 |
|
|
{ |
| 1188 |
|
|
*dzeta = theta; /* dzeta = phi */ |
| 1189 |
|
|
if ( (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)) > 1 && (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi) < 1.1 ) ) |
| 1190 |
|
|
*gamma = 0; |
| 1191 |
|
|
else if ( (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)) > 1.1 ) |
| 1192 |
|
|
{ |
| 1193 |
|
|
printf("error in calculation of gamma (angle between point and sun"); |
| 1194 |
|
|
exit(3); |
| 1195 |
|
|
} |
| 1196 |
|
|
else |
| 1197 |
|
|
*gamma = acos(cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)); |
| 1198 |
|
|
} |
| 1199 |
|
|
|
| 1200 |
|
|
|
| 1201 |
|
|
|
| 1202 |
|
|
/********************************************************************************/ |
| 1203 |
|
|
/* Fonction: integ_lv */ |
| 1204 |
|
|
/* */ |
| 1205 |
|
|
/* In: float *lv,*theta */ |
| 1206 |
|
|
/* int sun_pos */ |
| 1207 |
|
|
/* */ |
| 1208 |
|
|
/* Out: double */ |
| 1209 |
|
|
/* */ |
| 1210 |
|
|
/* Update: 29/08/93 */ |
| 1211 |
|
|
/* */ |
| 1212 |
|
|
/* Rem: */ |
| 1213 |
|
|
/* */ |
| 1214 |
|
|
/* But: calcul l'integrale de luminance relative sans la dir. du soleil */ |
| 1215 |
|
|
/* */ |
| 1216 |
|
|
/********************************************************************************/ |
| 1217 |
|
|
double integ_lv(float *lv,float *theta) |
| 1218 |
|
|
{ |
| 1219 |
|
|
int i; |
| 1220 |
|
|
double buffer=0.0; |
| 1221 |
|
|
|
| 1222 |
|
|
for (i=0;i<145;i++) |
| 1223 |
|
|
buffer += (*(lv+i))*cos(radians(*(theta+i))); |
| 1224 |
|
|
|
| 1225 |
greg |
2.9 |
return buffer*2*M_PI/144; |
| 1226 |
greg |
2.1 |
|
| 1227 |
|
|
} |
| 1228 |
|
|
|
| 1229 |
|
|
|
| 1230 |
|
|
|
| 1231 |
|
|
|
| 1232 |
|
|
|
| 1233 |
|
|
|
| 1234 |
|
|
/* enter day number(double), return E0 = square(R0/R): eccentricity correction factor */ |
| 1235 |
|
|
|
| 1236 |
|
|
double get_eccentricity() |
| 1237 |
|
|
{ |
| 1238 |
|
|
double day_angle; |
| 1239 |
|
|
double E0; |
| 1240 |
|
|
|
| 1241 |
greg |
2.9 |
day_angle = 2*M_PI*(daynumber - 1)/365; |
| 1242 |
greg |
2.1 |
E0 = 1.00011+0.034221*cos(day_angle)+0.00128*sin(day_angle)+ |
| 1243 |
|
|
0.000719*cos(2*day_angle)+0.000077*sin(2*day_angle); |
| 1244 |
|
|
|
| 1245 |
|
|
return (E0); |
| 1246 |
|
|
|
| 1247 |
|
|
} |
| 1248 |
|
|
|
| 1249 |
|
|
|
| 1250 |
|
|
/* enter sunzenith angle (degrees) return relative air mass (double) */ |
| 1251 |
|
|
double air_mass() |
| 1252 |
|
|
{ |
| 1253 |
|
|
double m; |
| 1254 |
|
|
|
| 1255 |
|
|
if (sunzenith>90) |
| 1256 |
|
|
{ |
| 1257 |
greg |
2.9 |
fprintf(stderr, "Solar zenith angle larger than 90 degrees in function air_mass()\n"); |
| 1258 |
greg |
2.1 |
exit(1); |
| 1259 |
|
|
} |
| 1260 |
|
|
|
| 1261 |
greg |
2.9 |
m = 1/( cos(sunzenith*M_PI/180)+0.15*exp( log(93.885-sunzenith)*(-1.253) ) ); |
| 1262 |
greg |
2.1 |
return(m); |
| 1263 |
|
|
} |
| 1264 |
|
|
|
| 1265 |
|
|
|
| 1266 |
|
|
|
