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#ifndef lint |
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static const char RCSid[] = "$Id: gendaylit.c,v 2.4 2011/08/10 22:28:45 greg Exp $"; |
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#endif |
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/* Copyright (c) 1994 *Fraunhofer Institut for Solar Energy Systems |
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* Oltmannstr 5, D-79100 Freiburg, Germany |
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* *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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*/ |
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|
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|
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|
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/* |
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* gendaylit.c program to generate the angular distribution of the daylight. |
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* Our zenith is along the Z-axis, the X-axis |
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* points east, and the Y-axis points north. |
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*/ |
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|
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#include <stdio.h> |
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#include <string.h> |
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#include <math.h> |
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#include <stdlib.h> |
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#include <ctype.h> |
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|
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#include "rtio.h" |
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#include "fvect.h" |
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#include "color.h" |
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#include "paths.h" |
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|
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extern int jdate(int month, int day); |
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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); |
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extern double sazi(double sd, double st); |
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|
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double normsc(); |
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|
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#define DATFILE "coeff_perez.dat" |
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|
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|
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|
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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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void computesky(); |
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|
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/* calculation of the direct and diffuse components from the Perez parametrization */ |
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double diffus_irradiance_from_sky_brightness(); |
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double direct_irradiance_from_sky_clearness(); |
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|
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|
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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(); |
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double glob_h_diffuse_effi_PEREZ(); |
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double direct_n_effi_PEREZ(); |
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/*likelihood check of the epsilon, delta, direct and diffuse components*/ |
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void check_parametrization(); |
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void check_irradiances(); |
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void check_illuminances(); |
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void illu_to_irra_index(); |
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|
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|
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/* Perez sky luminance model */ |
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int lect_coeff_perez(char *filename,float **coeff_perez); |
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double calc_rel_lum_perez(double dzeta,double gamma,double Z, |
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double epsilon,double Delta,float *coeff_perez); |
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/* coefficients for the sky luminance perez model */ |
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void coeff_lum_perez(double Z, double epsilon, double Delta, float *coeff_perez); |
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double radians(double degres); |
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double degres(double radians); |
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void theta_phi_to_dzeta_gamma(double theta,double phi,double *dzeta,double *gamma, double Z); |
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double integ_lv(float *lv,float *theta); |
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float *theta_ordered(char *filename); |
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float *phi_ordered(char *filename); |
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void skip_comments(FILE *fp); |
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|
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|
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|
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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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double get_angle_sun_direction(double sun_zenith, double sun_azimut, double direction_zenith, double direction_azimut); |
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|
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|
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/* date*/ |
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int jdate(int month, int day); |
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|
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|
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|
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|
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|
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/* sun calculation constants */ |
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extern double s_latitude; |
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extern double s_longitude; |
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extern double s_meridian; |
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|
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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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|
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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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|
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const double skyclearinf = 1.000; /* limitations for the variation of the Perez parameters */ |
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const double skyclearsup = 12.1; |
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const double skybriginf = 0.01; |
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const double skybrigsup = 0.6; |
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|
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|
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|
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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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|
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|
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|
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/* definition of the sky conditions through the Perez parametrization */ |
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double skyclearness, skybrightness; |
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double solarradiance; /*radiance of the sun disk and of the circumsolar area*/ |
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double diffusilluminance, directilluminance, diffusirradiance, directirradiance; |
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double sunzenith, daynumber=150, atm_preci_water=2; |
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|
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double diffnormalization, dirnormalization; |
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double *c_perez; |
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|
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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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|
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/* default values */ |
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int cloudy = 0; /* 1=standard, 2=uniform */ |
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int dosun = 1; |
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double zenithbr = -1.0; |
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double betaturbidity = 0.1; |
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double gprefl = 0.2; |
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int S_INTER=0; |
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|
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/* computed values */ |
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double sundir[3]; |
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double groundbr; |
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double F2; |
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double solarbr = 0.0; |
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int u_solar = 0; /* -1=irradiance, 1=radiance */ |
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|
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char *progname; |
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char errmsg[128]; |
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|
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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int i; |
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|
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progname = argv[0]; |
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if (argc == 2 && !strcmp(argv[1], "-defaults")) { |
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printdefaults(); |
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exit(0); |
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} |
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if (argc < 4) |
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userror("arg count"); |
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if (!strcmp(argv[1], "-ang")) { |
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altitude = atof(argv[2]) * (M_PI/180); |
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azimuth = atof(argv[3]) * (M_PI/180); |
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month = 0; |
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} else { |
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month = atoi(argv[1]); |
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if (month < 1 || month > 12) |
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userror("bad month"); |
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day = atoi(argv[2]); |
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if (day < 1 || day > 31) |
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userror("bad day"); |
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hour = atof(argv[3]); |
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if (hour < 0 || hour >= 24) |
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userror("bad hour"); |
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tsolar = argv[3][0] == '+'; |
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} |
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for (i = 4; i < argc; i++) |
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if (argv[i][0] == '-' || argv[i][0] == '+') |
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switch (argv[i][1]) { |
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case 's': |
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cloudy = 0; |
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dosun = argv[i][0] == '+'; |
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break; |
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case 'r': |
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case 'R': |
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u_solar = argv[i][1] == 'R' ? -1 : 1; |
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solarbr = atof(argv[++i]); |
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break; |
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case 'c': |
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cloudy = argv[i][0] == '+' ? 2 : 1; |
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dosun = 0; |
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break; |
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case 't': |
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betaturbidity = atof(argv[++i]); |
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break; |
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case 'b': |
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zenithbr = atof(argv[++i]); |
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break; |
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case 'g': |
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gprefl = atof(argv[++i]); |
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break; |
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case 'a': |
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s_latitude = atof(argv[++i]) * (M_PI/180); |
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break; |
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case 'o': |
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s_longitude = atof(argv[++i]) * (M_PI/180); |
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break; |
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case 'm': |
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s_meridian = atof(argv[++i]) * (M_PI/180); |
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break; |
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|
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|
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case 'O': |
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output = atof(argv[++i]); /*define the unit of the output of the program : |
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sky and sun luminance/radiance (0==W visible, 1==W solar radiation, 2==lm) |
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default is set to 0*/ |
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break; |
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|
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case 'P': |
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input = 0; /* Perez parameters: epsilon, delta */ |
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skyclearness = atof(argv[++i]); |
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skybrightness = atof(argv[++i]); |
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break; |
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|
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case 'W': /* direct normal Irradiance [W/m^2] */ |
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input = 1; /* diffuse horizontal Irrad. [W/m^2] */ |
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directirradiance = atof(argv[++i]); |
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diffusirradiance = atof(argv[++i]); |
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break; |
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|
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case 'L': /* direct normal Illuminance [Lux] */ |
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input = 2; /* diffuse horizontal Ill. [Lux] */ |
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directilluminance = atof(argv[++i]); |
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diffusilluminance = atof(argv[++i]); |
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break; |
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|
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case 'G': /* direct horizontal Irradiance [W/m^2] */ |
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input = 3; /* diffuse horizontal Irrad. [W/m^2] */ |
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directirradiance = atof(argv[++i]); |
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diffusirradiance = atof(argv[++i]); |
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break; |
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|
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|
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default: |
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sprintf(errmsg, "unknown option: %s", argv[i]); |
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userror(errmsg); |
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} |
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else |
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userror("bad option"); |
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|
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if (fabs(s_meridian-s_longitude) > 30*M_PI/180) |
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fprintf(stderr, |
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"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
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progname, (s_longitude-s_meridian)*12/M_PI); |
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|
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|
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/* allocation dynamique de memoire pour les pointeurs */ |
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if ( (c_perez = malloc(5*sizeof(double))) == NULL ) |
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{ |
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fprintf(stderr,"Out of memory error in function main !"); |
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exit(1); |
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} |
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|
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|
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printhead(argc, argv); |
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|
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computesky(); |
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printsky(); |
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|
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exit(0); |
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} |
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|
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|
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void |
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computesky() /* compute sky parameters */ |
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{ |
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|
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/* new variables */ |
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int j, i; |
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float *lv_mod; /* 145 luminance values*/ |
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/* 145 directions for the calculation of the normalization coefficient, coefficient Perez model */ |
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float *theta_o, *phi_o, *coeff_perez; |
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double dzeta, gamma; |
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double diffusion; |
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double normfactor; |
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|
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|
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|
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/* compute solar direction */ |
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|
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if (month) { /* from date and time */ |
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int jd; |
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double sd, st; |
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|
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jd = jdate(month, day); /* Julian date */ |
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sd = sdec(jd); /* solar declination */ |
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if (tsolar) /* solar time */ |
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st = hour; |
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else |
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st = hour + stadj(jd); |
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altitude = salt(sd, st); |
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azimuth = sazi(sd, st); |
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|
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daynumber = (double)jdate(month, day); |
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|
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} |
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if (!cloudy && altitude > 87.*M_PI/180.) { |
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fprintf(stderr, |
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"%s: warning - sun too close to zenith, reducing altitude to 87 degrees\n", |
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progname); |
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printf( |
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"# warning - sun too close to zenith, reducing altitude to 87 degrees\n"); |
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altitude = 87.*M_PI/180.; |
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} |
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sundir[0] = -sin(azimuth)*cos(altitude); |
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sundir[1] = -cos(azimuth)*cos(altitude); |
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sundir[2] = sin(altitude); |
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|
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|
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/* calculation for the new functions */ |
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sunzenith = 90 - altitude*180/M_PI; |
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|
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|
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|
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/* compute the inputs for the calculation of the light distribution over the sky*/ |
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if (input==0) |
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{ |
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check_parametrization(); |
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diffusirradiance = diffus_irradiance_from_sky_brightness(); /*diffuse horizontal irradiance*/ |
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directirradiance = direct_irradiance_from_sky_clearness(); |
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check_irradiances(); |
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|
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if (output==0 || output==2) |
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{ |
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diffusilluminance = diffusirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
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directilluminance = directirradiance*direct_n_effi_PEREZ(); |
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check_illuminances(); |
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} |
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} |
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|
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|
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else if (input==1) |
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{ |
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check_irradiances(); |
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skybrightness = sky_brightness(); |
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skyclearness = sky_clearness(); |
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check_parametrization(); |
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|
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if (output==0 || output==2) |
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{ |
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diffusilluminance = diffusirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
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directilluminance = directirradiance*direct_n_effi_PEREZ(); |
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check_illuminances(); |
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} |
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|
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} |
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|
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|
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else if (input==2) |
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{ |
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check_illuminances(); |
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illu_to_irra_index(); |
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check_parametrization(); |
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} |
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|
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|
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else if (input==3) |
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{ |
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if (altitude<=0) |
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{ |
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fprintf(stderr, "solar zenith angle larger than 90� \n the models used are not more valid\n"); |
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exit(1); |
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} |
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|
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directirradiance=directirradiance/sin(altitude); |
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check_irradiances(); |
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skybrightness = sky_brightness(); |
| 381 |
skyclearness = sky_clearness(); |
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check_parametrization(); |
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|
| 384 |
if (output==0 || output==2) |
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{ |
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diffusilluminance = diffusirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
| 387 |
directilluminance = directirradiance*direct_n_effi_PEREZ(); |
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check_illuminances(); |
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} |
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|
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} |
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|
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|
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else {fprintf(stderr,"error in giving the input arguments"); exit(1);} |
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|
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|
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|
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/* normalization factor for the relative sky luminance distribution, diffuse part*/ |
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|
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/* allocation dynamique de memoire pour les pointeurs */ |
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if ( (coeff_perez = malloc(8*20*sizeof(float))) == NULL ) |
| 402 |
{ |
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fprintf(stderr,"Out of memory error in function main !"); |
| 404 |
exit(1); |
| 405 |
} |
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|
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/* read the coefficients for the Perez sky luminance model */ |
| 408 |
if (lect_coeff_perez(DATFILE, &coeff_perez) > 0) |
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{ |
| 410 |
fprintf(stderr,"lect_coeff_perez does not work\n"); |
| 411 |
exit(2); |
| 412 |
} |
| 413 |
|
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if ( (lv_mod = malloc(145*sizeof(float))) == NULL) |
| 415 |
{ |
| 416 |
fprintf(stderr,"Out of memory in function main"); |
| 417 |
exit(1); |
| 418 |
} |
| 419 |
|
| 420 |
/* read the angles */ |
| 421 |
theta_o = theta_ordered("defangle.dat"); |
| 422 |
phi_o = phi_ordered("defangle.dat"); |
| 423 |
|
| 424 |
/* parameters for the perez model */ |
| 425 |
coeff_lum_perez(radians(sunzenith), skyclearness, skybrightness, coeff_perez); |
| 426 |
|
| 427 |
/*calculation of the modelled luminance */ |
| 428 |
for (j=0;j<145;j++) |
| 429 |
{ |
| 430 |
theta_phi_to_dzeta_gamma(radians(*(theta_o+j)),radians(*(phi_o+j)),&dzeta,&gamma,radians(sunzenith)); |
| 431 |
*(lv_mod+j) = calc_rel_lum_perez(dzeta,gamma,radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 432 |
/*printf("theta, phi, lv_mod %lf\t %lf\t %lf\n", *(theta_o+j),*(phi_o+j),*(lv_mod+j));*/ |
| 433 |
} |
| 434 |
|
| 435 |
/* integration of luminance for the normalization factor, diffuse part of the sky*/ |
| 436 |
diffnormalization = integ_lv(lv_mod, theta_o); |
| 437 |
/*printf("perez integration %lf\n", diffnormalization);*/ |
| 438 |
|
| 439 |
|
| 440 |
|
| 441 |
|
| 442 |
/*normalization coefficient in lumen or in watt*/ |
| 443 |
if (output==0) |
| 444 |
{ |
| 445 |
diffnormalization = diffusilluminance/diffnormalization/WHTEFFICACY; |
| 446 |
} |
| 447 |
else if (output==1) |
| 448 |
{ |
| 449 |
diffnormalization = diffusirradiance/diffnormalization; |
| 450 |
} |
| 451 |
else if (output==2) |
| 452 |
{ |
| 453 |
diffnormalization = diffusilluminance/diffnormalization; |
| 454 |
} |
| 455 |
|
| 456 |
else {fprintf(stderr,"output argument : wrong number"); exit(1);} |
| 457 |
|
| 458 |
|
| 459 |
|
| 460 |
|
| 461 |
/* calculation for the solar source */ |
| 462 |
if (output==0) |
| 463 |
solarradiance = directilluminance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180)))/WHTEFFICACY; |
| 464 |
|
| 465 |
else if (output==1) |
| 466 |
solarradiance = directirradiance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180))); |
| 467 |
|
| 468 |
else |
| 469 |
solarradiance = directilluminance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180))); |
| 470 |
|
| 471 |
|
| 472 |
|
| 473 |
|
| 474 |
/* Compute the ground radiance */ |
| 475 |
zenithbr=calc_rel_lum_perez(0.0,radians(sunzenith),radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 476 |
zenithbr*=diffnormalization; |
| 477 |
/* |
| 478 |
fprintf(stderr, "gendaylit : the actual zenith radiance(W/m^2/sr) or luminance(cd/m^2) is : %.0lf\n", zenithbr); |
| 479 |
*/ |
| 480 |
|
| 481 |
if (skyclearness==1) |
| 482 |
normfactor = 0.777778; |
| 483 |
|
| 484 |
if (skyclearness>=6) |
| 485 |
{ |
| 486 |
F2 = 0.274*(0.91 + 10.0*exp(-3.0*(M_PI/2.0-altitude)) + 0.45*sundir[2]*sundir[2]); |
| 487 |
normfactor = normsc()/F2/M_PI; |
| 488 |
} |
| 489 |
|
| 490 |
if ( (skyclearness>1) && (skyclearness<6) ) |
| 491 |
{ |
| 492 |
S_INTER=1; |
| 493 |
F2 = (2.739 + .9891*sin(.3119+2.6*altitude)) * exp(-(M_PI/2.0-altitude)*(.4441+1.48*altitude)); |
| 494 |
normfactor = normsc()/F2/M_PI; |
| 495 |
} |
| 496 |
|
| 497 |
groundbr = zenithbr*normfactor; |
| 498 |
printf("# Ground ambient level: %.1f\n", groundbr); |
| 499 |
|
| 500 |
if (dosun&&(skyclearness>1)) |
| 501 |
groundbr += 6.8e-5/M_PI*solarradiance*sundir[2]; |
| 502 |
|
| 503 |
groundbr *= gprefl; |
| 504 |
|
| 505 |
|
| 506 |
|
| 507 |
return; |
| 508 |
} |
| 509 |
|
| 510 |
|
| 511 |
|
| 512 |
|
| 513 |
|
| 514 |
|
| 515 |
|
| 516 |
printsky() /* print out sky */ |
| 517 |
{ |
| 518 |
if (dosun&&(skyclearness>1)) |
| 519 |
{ |
| 520 |
printf("\nvoid light solar\n"); |
| 521 |
printf("0\n0\n"); |
| 522 |
printf("3 %.3e %.3e %.3e\n", solarradiance, solarradiance, solarradiance); |
| 523 |
printf("\nsolar source sun\n"); |
| 524 |
printf("0\n0\n"); |
| 525 |
printf("4 %f %f %f %f\n", sundir[0], sundir[1], sundir[2], 2*half_sun_angle); |
| 526 |
} |
| 527 |
|
| 528 |
if (dosun&&(skyclearness==1)) |
| 529 |
{ |
| 530 |
printf("\nvoid light solar\n"); |
| 531 |
printf("0\n0\n"); |
| 532 |
printf("3 0.0 0.0 0.0\n"); |
| 533 |
printf("\nsolar source sun\n"); |
| 534 |
printf("0\n0\n"); |
| 535 |
printf("4 %f %f %f %f\n", sundir[0], sundir[1], sundir[2], 2*half_sun_angle); |
| 536 |
} |
| 537 |
|
| 538 |
|
| 539 |
printf("\nvoid brightfunc skyfunc\n"); |
| 540 |
printf("2 skybright perezlum.cal\n"); |
| 541 |
printf("0\n"); |
| 542 |
printf("10 %.3e %.3e %lf %lf %lf %lf %lf %f %f %f \n", diffnormalization, groundbr, |
| 543 |
*(c_perez+0),*(c_perez+1),*(c_perez+2),*(c_perez+3),*(c_perez+4), |
| 544 |
sundir[0], sundir[1], sundir[2]); |
| 545 |
} |
| 546 |
|
| 547 |
|
| 548 |
printdefaults() /* print default values */ |
| 549 |
{ |
| 550 |
printf("-g %f\t\t\t# Ground plane reflectance\n", gprefl); |
| 551 |
if (zenithbr > 0.0) |
| 552 |
printf("-b %f\t\t\t# Zenith radiance (watts/ster/m^2\n", zenithbr); |
| 553 |
else |
| 554 |
printf("-t %f\t\t\t# Atmospheric betaturbidity\n", betaturbidity); |
| 555 |
printf("-a %f\t\t\t# Site latitude (degrees)\n", s_latitude*(180/M_PI)); |
| 556 |
printf("-o %f\t\t\t# Site longitude (degrees)\n", s_longitude*(180/M_PI)); |
| 557 |
printf("-m %f\t\t\t# Standard meridian (degrees)\n", s_meridian*(180/M_PI)); |
| 558 |
} |
| 559 |
|
| 560 |
|
| 561 |
userror(msg) /* print usage error and quit */ |
| 562 |
char *msg; |
| 563 |
{ |
| 564 |
if (msg != NULL) |
| 565 |
fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
| 566 |
fprintf(stderr, "Usage: %s month day hour [-P|-W|-L] direct_value diffus_value [options]\n", progname); |
| 567 |
fprintf(stderr, "or : %s -ang altitude azimuth [-P|-W|-L] direct_value diffus_value [options]\n", progname); |
| 568 |
fprintf(stderr, " -P epsilon delta (these are the Perez parameters) \n"); |
| 569 |
fprintf(stderr, " -W direct-normal-irradiance diffuse-horizontal-irradiance (W/m^2)\n"); |
| 570 |
fprintf(stderr, " -L direct-normal-illuminance diffuse-horizontal-illuminance (lux)\n"); |
| 571 |
fprintf(stderr, " -G direct-horizontal-irradiance diffuse-horizontal-irradiance (W/m^2)\n"); |
| 572 |
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"); |
| 573 |
exit(1); |
| 574 |
} |
| 575 |
|
| 576 |
|
| 577 |
|
| 578 |
double |
| 579 |
normsc() /* compute normalization factor (E0*F2/L0) */ |
| 580 |
{ |
| 581 |
static double nfc[2][5] = { |
| 582 |
/* clear sky approx. */ |
| 583 |
{2.766521, 0.547665, -0.369832, 0.009237, 0.059229}, |
| 584 |
/* intermediate sky approx. */ |
| 585 |
{3.5556, -2.7152, -1.3081, 1.0660, 0.60227}, |
| 586 |
}; |
| 587 |
register double *nf; |
| 588 |
double x, nsc; |
| 589 |
register int i; |
| 590 |
/* polynomial approximation */ |
| 591 |
nf = nfc[S_INTER]; |
| 592 |
x = (altitude - M_PI/4.0)/(M_PI/4.0); |
| 593 |
nsc = nf[i=4]; |
| 594 |
while (i--) |
| 595 |
nsc = nsc*x + nf[i]; |
| 596 |
|
| 597 |
return(nsc); |
| 598 |
} |
| 599 |
|
| 600 |
|
| 601 |
|
| 602 |
printhead(ac, av) /* print command header */ |
| 603 |
register int ac; |
| 604 |
register char **av; |
| 605 |
{ |
| 606 |
putchar('#'); |
| 607 |
while (ac--) { |
| 608 |
putchar(' '); |
| 609 |
fputs(*av++, stdout); |
| 610 |
} |
| 611 |
putchar('\n'); |
| 612 |
} |
| 613 |
|
| 614 |
|
| 615 |
|
| 616 |
|
| 617 |
void |
| 618 |
skip_comments(FILE *fp) /* skip comments in file */ |
| 619 |
{ |
| 620 |
int c; |
| 621 |
|
| 622 |
while ((c = getc(fp)) != EOF) |
| 623 |
if (c == '#') { |
| 624 |
while ((c = getc(fp)) != EOF) |
| 625 |
if (c == '\n') |
| 626 |
break; |
| 627 |
} else if (!isspace(c)) { |
| 628 |
ungetc(c, fp); |
| 629 |
break; |
| 630 |
} |
| 631 |
} |
| 632 |
|
| 633 |
|
| 634 |
|
| 635 |
/* Perez models */ |
| 636 |
|
| 637 |
/* Perez global horizontal luminous efficacy model */ |
| 638 |
double glob_h_effi_PEREZ() |
| 639 |
{ |
| 640 |
|
| 641 |
double value; |
| 642 |
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 643 |
int category_total_number, category_number, i; |
| 644 |
|
| 645 |
|
| 646 |
if (skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<=skybriginf || skybrightness>skybrigsup) |
| 647 |
fprintf(stderr, "Warning : skyclearness or skybrightness out of range ; \n Check your input parameters\n"); |
| 648 |
|
| 649 |
/* initialize category bounds (clearness index bounds) */ |
| 650 |
|
| 651 |
category_total_number = 8; |
| 652 |
|
| 653 |
category_bounds[1] = 1; |
| 654 |
category_bounds[2] = 1.065; |
| 655 |
category_bounds[3] = 1.230; |
| 656 |
category_bounds[4] = 1.500; |
| 657 |
category_bounds[5] = 1.950; |
| 658 |
category_bounds[6] = 2.800; |
| 659 |
category_bounds[7] = 4.500; |
| 660 |
category_bounds[8] = 6.200; |
| 661 |
category_bounds[9] = 12.01; |
| 662 |
|
| 663 |
|
| 664 |
/* initialize model coefficients */ |
| 665 |
a[1] = 96.63; |
| 666 |
a[2] = 107.54; |
| 667 |
a[3] = 98.73; |
| 668 |
a[4] = 92.72; |
| 669 |
a[5] = 86.73; |
| 670 |
a[6] = 88.34; |
| 671 |
a[7] = 78.63; |
| 672 |
a[8] = 99.65; |
| 673 |
|
| 674 |
b[1] = -0.47; |
| 675 |
b[2] = 0.79; |
| 676 |
b[3] = 0.70; |
| 677 |
b[4] = 0.56; |
| 678 |
b[5] = 0.98; |
| 679 |
b[6] = 1.39; |
| 680 |
b[7] = 1.47; |
| 681 |
b[8] = 1.86; |
| 682 |
|
| 683 |
c[1] = 11.50; |
| 684 |
c[2] = 1.79; |
| 685 |
c[3] = 4.40; |
| 686 |
c[4] = 8.36; |
| 687 |
c[5] = 7.10; |
| 688 |
c[6] = 6.06; |
| 689 |
c[7] = 4.93; |
| 690 |
c[8] = -4.46; |
| 691 |
|
| 692 |
d[1] = -9.16; |
| 693 |
d[2] = -1.19; |
| 694 |
d[3] = -6.95; |
| 695 |
d[4] = -8.31; |
| 696 |
d[5] = -10.94; |
| 697 |
d[6] = -7.60; |
| 698 |
d[7] = -11.37; |
| 699 |
d[8] = -3.15; |
| 700 |
|
| 701 |
|
| 702 |
|
| 703 |
|
| 704 |
for (i=1; i<=category_total_number; i++) |
| 705 |
{ |
| 706 |
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 707 |
category_number = i; |
| 708 |
} |
| 709 |
|
| 710 |
value = a[category_number] + b[category_number]*atm_preci_water + |
| 711 |
c[category_number]*cos(sunzenith*M_PI/180) + d[category_number]*log(skybrightness); |
| 712 |
|
| 713 |
return(value); |
| 714 |
} |
| 715 |
|
| 716 |
|
| 717 |
/* global horizontal diffuse efficacy model, according to PEREZ */ |
| 718 |
double glob_h_diffuse_effi_PEREZ() |
| 719 |
{ |
| 720 |
double value; |
| 721 |
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 722 |
int category_total_number, category_number, i; |
| 723 |
|
| 724 |
|
| 725 |
if (skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<=skybriginf || skybrightness>skybrigsup) |
| 726 |
fprintf(stderr, "Warning : skyclearness or skybrightness out of range ; \n Check your input parameters\n"); |
| 727 |
|
| 728 |
/* initialize category bounds (clearness index bounds) */ |
| 729 |
|
| 730 |
category_total_number = 8; |
| 731 |
|
| 732 |
category_bounds[1] = 1; |
| 733 |
category_bounds[2] = 1.065; |
| 734 |
category_bounds[3] = 1.230; |
| 735 |
category_bounds[4] = 1.500; |
| 736 |
category_bounds[5] = 1.950; |
| 737 |
category_bounds[6] = 2.800; |
| 738 |
category_bounds[7] = 4.500; |
| 739 |
category_bounds[8] = 6.200; |
| 740 |
category_bounds[9] = 12.01; |
| 741 |
|
| 742 |
|
| 743 |
/* initialize model coefficients */ |
| 744 |
a[1] = 97.24; |
| 745 |
a[2] = 107.22; |
| 746 |
a[3] = 104.97; |
| 747 |
a[4] = 102.39; |
| 748 |
a[5] = 100.71; |
| 749 |
a[6] = 106.42; |
| 750 |
a[7] = 141.88; |
| 751 |
a[8] = 152.23; |
| 752 |
|
| 753 |
b[1] = -0.46; |
| 754 |
b[2] = 1.15; |
| 755 |
b[3] = 2.96; |
| 756 |
b[4] = 5.59; |
| 757 |
b[5] = 5.94; |
| 758 |
b[6] = 3.83; |
| 759 |
b[7] = 1.90; |
| 760 |
b[8] = 0.35; |
| 761 |
|
| 762 |
c[1] = 12.00; |
| 763 |
c[2] = 0.59; |
| 764 |
c[3] = -5.53; |
| 765 |
c[4] = -13.95; |
| 766 |
c[5] = -22.75; |
| 767 |
c[6] = -36.15; |
| 768 |
c[7] = -53.24; |
| 769 |
c[8] = -45.27; |
| 770 |
|
| 771 |
d[1] = -8.91; |
| 772 |
d[2] = -3.95; |
| 773 |
d[3] = -8.77; |
| 774 |
d[4] = -13.90; |
| 775 |
d[5] = -23.74; |
| 776 |
d[6] = -28.83; |
| 777 |
d[7] = -14.03; |
| 778 |
d[8] = -7.98; |
| 779 |
|
| 780 |
|
| 781 |
|
| 782 |
|
| 783 |
for (i=1; i<=category_total_number; i++) |
| 784 |
{ |
| 785 |
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 786 |
category_number = i; |
| 787 |
} |
| 788 |
|
| 789 |
value = a[category_number] + b[category_number]*atm_preci_water + c[category_number]*cos(sunzenith*M_PI/180) + |
| 790 |
d[category_number]*log(skybrightness); |
| 791 |
|
| 792 |
return(value); |
| 793 |
} |
| 794 |
|
| 795 |
|
| 796 |
/* direct normal efficacy model, according to PEREZ */ |
| 797 |
|
| 798 |
double direct_n_effi_PEREZ() |
| 799 |
|
| 800 |
{ |
| 801 |
double value; |
| 802 |
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 803 |
int category_total_number, category_number, i; |
| 804 |
|
| 805 |
|
| 806 |
if (skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<=skybriginf || skybrightness>skybrigsup) |
| 807 |
fprintf(stderr, "Warning : skyclearness or skybrightness out of range ; \n Check your input parameters\n"); |
| 808 |
|
| 809 |
|
| 810 |
/* initialize category bounds (clearness index bounds) */ |
| 811 |
|
| 812 |
category_total_number = 8; |
| 813 |
|
| 814 |
category_bounds[1] = 1; |
| 815 |
category_bounds[2] = 1.065; |
| 816 |
category_bounds[3] = 1.230; |
| 817 |
category_bounds[4] = 1.500; |
| 818 |
category_bounds[5] = 1.950; |
| 819 |
category_bounds[6] = 2.800; |
| 820 |
category_bounds[7] = 4.500; |
| 821 |
category_bounds[8] = 6.200; |
| 822 |
category_bounds[9] = 12.1; |
| 823 |
|
| 824 |
|
| 825 |
/* initialize model coefficients */ |
| 826 |
a[1] = 57.20; |
| 827 |
a[2] = 98.99; |
| 828 |
a[3] = 109.83; |
| 829 |
a[4] = 110.34; |
| 830 |
a[5] = 106.36; |
| 831 |
a[6] = 107.19; |
| 832 |
a[7] = 105.75; |
| 833 |
a[8] = 101.18; |
| 834 |
|
| 835 |
b[1] = -4.55; |
| 836 |
b[2] = -3.46; |
| 837 |
b[3] = -4.90; |
| 838 |
b[4] = -5.84; |
| 839 |
b[5] = -3.97; |
| 840 |
b[6] = -1.25; |
| 841 |
b[7] = 0.77; |
| 842 |
b[8] = 1.58; |
| 843 |
|
| 844 |
c[1] = -2.98; |
| 845 |
c[2] = -1.21; |
| 846 |
c[3] = -1.71; |
| 847 |
c[4] = -1.99; |
| 848 |
c[5] = -1.75; |
| 849 |
c[6] = -1.51; |
| 850 |
c[7] = -1.26; |
| 851 |
c[8] = -1.10; |
| 852 |
|
| 853 |
d[1] = 117.12; |
| 854 |
d[2] = 12.38; |
| 855 |
d[3] = -8.81; |
| 856 |
d[4] = -4.56; |
| 857 |
d[5] = -6.16; |
| 858 |
d[6] = -26.73; |
| 859 |
d[7] = -34.44; |
| 860 |
d[8] = -8.29; |
| 861 |
|
| 862 |
|
| 863 |
|
| 864 |
for (i=1; i<=category_total_number; i++) |
| 865 |
{ |
| 866 |
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 867 |
category_number = i; |
| 868 |
} |
| 869 |
|
| 870 |
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; |
| 871 |
|
| 872 |
if (value < 0) value = 0; |
| 873 |
|
| 874 |
return(value); |
| 875 |
} |
| 876 |
|
| 877 |
|
| 878 |
/*check the range of epsilon and delta indexes of the perez parametrization*/ |
| 879 |
void check_parametrization() |
| 880 |
{ |
| 881 |
if (skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<=skybriginf || skybrightness>skybrigsup) |
| 882 |
{ |
| 883 |
fprintf(stderr,"sky clearness or sky brightness out of range %lf\t %lf\n", skyclearness, skybrightness); |
| 884 |
exit(1); |
| 885 |
} |
| 886 |
else return; |
| 887 |
} |
| 888 |
|
| 889 |
|
| 890 |
/* likelihood of the direct and diffuse components */ |
| 891 |
void check_illuminances() |
| 892 |
{ |
| 893 |
if (!( (directilluminance>=0) && (directilluminance<=solar_constant_l*1000) && (diffusilluminance>0) )) |
| 894 |
{ |
| 895 |
fprintf(stderr,"direct or diffuse illuminances out of range\n"); |
| 896 |
exit(1); |
| 897 |
} |
| 898 |
return; |
| 899 |
} |
| 900 |
|
| 901 |
|
| 902 |
void check_irradiances() |
| 903 |
{ |
| 904 |
if (!( (directirradiance>=0) && (directirradiance<=solar_constant_e) && (diffusirradiance>0) )) |
| 905 |
{ |
| 906 |
fprintf(stderr,"direct or diffuse irradiances out of range\n"); |
| 907 |
exit(1); |
| 908 |
} |
| 909 |
return; |
| 910 |
} |
| 911 |
|
| 912 |
|
| 913 |
|
| 914 |
/* Perez sky's brightness */ |
| 915 |
double sky_brightness() |
| 916 |
{ |
| 917 |
double value; |
| 918 |
|
| 919 |
value = diffusirradiance * air_mass() / ( solar_constant_e*get_eccentricity()); |
| 920 |
|
| 921 |
return(value); |
| 922 |
} |
| 923 |
|
| 924 |
|
| 925 |
/* Perez sky's clearness */ |
| 926 |
double sky_clearness() |
| 927 |
{ |
| 928 |
double value; |
| 929 |
|
| 930 |
value = ( (diffusirradiance + directirradiance)/(diffusirradiance) + 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) ; |
| 931 |
|
| 932 |
return(value); |
| 933 |
} |
| 934 |
|
| 935 |
|
| 936 |
|
| 937 |
/* diffus horizontal irradiance from Perez sky's brightness */ |
| 938 |
double diffus_irradiance_from_sky_brightness() |
| 939 |
{ |
| 940 |
double value; |
| 941 |
|
| 942 |
value = skybrightness / air_mass() * ( solar_constant_e*get_eccentricity()); |
| 943 |
|
| 944 |
return(value); |
| 945 |
} |
| 946 |
|
| 947 |
|
| 948 |
/* direct normal irradiance from Perez sky's clearness */ |
| 949 |
double direct_irradiance_from_sky_clearness() |
| 950 |
{ |
| 951 |
double value; |
| 952 |
|
| 953 |
value = diffus_irradiance_from_sky_brightness(); |
| 954 |
value = value * ( (skyclearness-1) * (1+1.041*sunzenith*M_PI/180*sunzenith*M_PI/180*sunzenith*M_PI/180) ); |
| 955 |
|
| 956 |
return(value); |
| 957 |
} |
| 958 |
|
| 959 |
|
| 960 |
void illu_to_irra_index(void) |
| 961 |
{ |
| 962 |
double test1=0.1, test2=0.1; |
| 963 |
int counter=0; |
| 964 |
|
| 965 |
diffusirradiance = diffusilluminance*solar_constant_e/(solar_constant_l*1000); |
| 966 |
directirradiance = directilluminance*solar_constant_e/(solar_constant_l*1000); |
| 967 |
skyclearness = sky_clearness(); |
| 968 |
skybrightness = sky_brightness(); |
| 969 |
if (skyclearness>12) skyclearness=12; |
| 970 |
if (skybrightness<0.05) skybrightness=0.01; |
| 971 |
|
| 972 |
|
| 973 |
while ( ((fabs(diffusirradiance-test1)>10) || (fabs(directirradiance-test2)>10) |
| 974 |
|| skyclearness>skyclearinf || skyclearness<skyclearsup |
| 975 |
|| skybrightness>skybriginf || skybrightness<skybrigsup ) |
| 976 |
&& !(counter==5) ) |
| 977 |
{ |
| 978 |
/*fprintf(stderr, "conversion illuminance into irradiance %lf\t %lf\n", diffusirradiance, directirradiance);*/ |
| 979 |
|
| 980 |
test1=diffusirradiance; |
| 981 |
test2=directirradiance; |
| 982 |
counter++; |
| 983 |
|
| 984 |
diffusirradiance = diffusilluminance/glob_h_diffuse_effi_PEREZ(); |
| 985 |
directirradiance = directilluminance/direct_n_effi_PEREZ(); |
| 986 |
/*fprintf(stderr, "conversion illuminance into irradiance %lf\t %lf\n", diffusirradiance, directirradiance);*/ |
| 987 |
|
| 988 |
skybrightness = sky_brightness(); |
| 989 |
skyclearness = sky_clearness(); |
| 990 |
if (skyclearness>12) skyclearness=12; |
| 991 |
if (skybrightness<0.05) skybrightness=0.01; |
| 992 |
|
| 993 |
/*fprintf(stderr, "%lf\t %lf\n", skybrightness, skyclearness);*/ |
| 994 |
|
| 995 |
} |
| 996 |
|
| 997 |
|
| 998 |
return; |
| 999 |
} |
| 1000 |
|
| 1001 |
|
| 1002 |
int lect_coeff_perez(char *filename,float **coeff_perez) |
| 1003 |
{ |
| 1004 |
FILE *fcoeff_perez; |
| 1005 |
float temp; |
| 1006 |
int i,j; |
| 1007 |
|
| 1008 |
if ((fcoeff_perez = frlibopen(filename)) == NULL) |
| 1009 |
{ |
| 1010 |
fprintf(stderr,"file %s cannot be opened\n", filename); |
| 1011 |
return 1; /* il y a un probleme de fichier */ |
| 1012 |
} |
| 1013 |
else |
| 1014 |
{ |
| 1015 |
/*printf("file %s open\n", filename);*/ |
| 1016 |
} |
| 1017 |
|
| 1018 |
skip_comments(fcoeff_perez); |
| 1019 |
|
| 1020 |
for (i=0;i<8;i++) |
| 1021 |
for (j=0;j<20;j++) |
| 1022 |
{ |
| 1023 |
fscanf(fcoeff_perez,"%f",&temp); |
| 1024 |
*(*coeff_perez+i*20+j) = temp; |
| 1025 |
} |
| 1026 |
fclose(fcoeff_perez); |
| 1027 |
|
| 1028 |
return 0; /* tout est OK */ |
| 1029 |
} |
| 1030 |
|
| 1031 |
|
| 1032 |
|
| 1033 |
/* sky luminance perez model */ |
| 1034 |
double calc_rel_lum_perez(double dzeta,double gamma,double Z, |
| 1035 |
double epsilon,double Delta,float *coeff_perez) |
| 1036 |
{ |
| 1037 |
float x[5][4]; |
| 1038 |
int i,j,num_lin; |
| 1039 |
double c_perez[5]; |
| 1040 |
|
| 1041 |
if ( (epsilon < skyclearinf) || (epsilon >= skyclearsup) ) |
| 1042 |
{ |
| 1043 |
fprintf(stderr,"Epsilon out of range in function calc_rel_lum_perez !\n"); |
| 1044 |
exit(1); |
| 1045 |
} |
| 1046 |
|
| 1047 |
/* correction de modele de Perez solar energy ...*/ |
| 1048 |
if ( (epsilon > 1.065) && (epsilon < 2.8) ) |
| 1049 |
{ |
| 1050 |
if ( Delta < 0.2 ) Delta = 0.2; |
| 1051 |
} |
| 1052 |
|
| 1053 |
if ( (epsilon >= 1.000) && (epsilon < 1.065) ) num_lin = 0; |
| 1054 |
if ( (epsilon >= 1.065) && (epsilon < 1.230) ) num_lin = 1; |
| 1055 |
if ( (epsilon >= 1.230) && (epsilon < 1.500) ) num_lin = 2; |
| 1056 |
if ( (epsilon >= 1.500) && (epsilon < 1.950) ) num_lin = 3; |
| 1057 |
if ( (epsilon >= 1.950) && (epsilon < 2.800) ) num_lin = 4; |
| 1058 |
if ( (epsilon >= 2.800) && (epsilon < 4.500) ) num_lin = 5; |
| 1059 |
if ( (epsilon >= 4.500) && (epsilon < 6.200) ) num_lin = 6; |
| 1060 |
if ( (epsilon >= 6.200) && (epsilon < 14.00) ) num_lin = 7; |
| 1061 |
|
| 1062 |
for (i=0;i<5;i++) |
| 1063 |
for (j=0;j<4;j++) |
| 1064 |
{ |
| 1065 |
x[i][j] = *(coeff_perez + 20*num_lin + 4*i +j); |
| 1066 |
/* printf("x %d %d vaut %f\n",i,j,x[i][j]); */ |
| 1067 |
} |
| 1068 |
|
| 1069 |
|
| 1070 |
if (num_lin) |
| 1071 |
{ |
| 1072 |
for (i=0;i<5;i++) |
| 1073 |
c_perez[i] = x[i][0] + x[i][1]*Z + Delta * (x[i][2] + x[i][3]*Z); |
| 1074 |
} |
| 1075 |
else |
| 1076 |
{ |
| 1077 |
c_perez[0] = x[0][0] + x[0][1]*Z + Delta * (x[0][2] + x[0][3]*Z); |
| 1078 |
c_perez[1] = x[1][0] + x[1][1]*Z + Delta * (x[1][2] + x[1][3]*Z); |
| 1079 |
c_perez[4] = x[4][0] + x[4][1]*Z + Delta * (x[4][2] + x[4][3]*Z); |
| 1080 |
c_perez[2] = exp( pow(Delta*(x[2][0]+x[2][1]*Z),x[2][2])) - x[2][3]; |
| 1081 |
c_perez[3] = -exp( Delta*(x[3][0]+x[3][1]*Z) )+x[3][2]+Delta*x[3][3]; |
| 1082 |
} |
| 1083 |
|
| 1084 |
|
| 1085 |
return (1 + c_perez[0]*exp(c_perez[1]/cos(dzeta)) ) * |
| 1086 |
(1 + c_perez[2]*exp(c_perez[3]*gamma) + |
| 1087 |
c_perez[4]*cos(gamma)*cos(gamma) ); |
| 1088 |
} |
| 1089 |
|
| 1090 |
|
| 1091 |
|
| 1092 |
/* coefficients for the sky luminance perez model */ |
| 1093 |
void coeff_lum_perez(double Z, double epsilon, double Delta, float *coeff_perez) |
| 1094 |
{ |
| 1095 |
float x[5][4]; |
| 1096 |
int i,j,num_lin; |
| 1097 |
|
| 1098 |
if ( (epsilon < skyclearinf) || (epsilon >= skyclearsup) ) |
| 1099 |
{ |
| 1100 |
fprintf(stderr,"Epsilon out of range in function calc_rel_lum_perez !\n"); |
| 1101 |
exit(1); |
| 1102 |
} |
| 1103 |
|
| 1104 |
/* correction du modele de Perez solar energy ...*/ |
| 1105 |
if ( (epsilon > 1.065) && (epsilon < 2.8) ) |
| 1106 |
{ |
| 1107 |
if ( Delta < 0.2 ) Delta = 0.2; |
| 1108 |
} |
| 1109 |
|
| 1110 |
if ( (epsilon >= 1.000) && (epsilon < 1.065) ) num_lin = 0; |
| 1111 |
if ( (epsilon >= 1.065) && (epsilon < 1.230) ) num_lin = 1; |
| 1112 |
if ( (epsilon >= 1.230) && (epsilon < 1.500) ) num_lin = 2; |
| 1113 |
if ( (epsilon >= 1.500) && (epsilon < 1.950) ) num_lin = 3; |
| 1114 |
if ( (epsilon >= 1.950) && (epsilon < 2.800) ) num_lin = 4; |
| 1115 |
if ( (epsilon >= 2.800) && (epsilon < 4.500) ) num_lin = 5; |
| 1116 |
if ( (epsilon >= 4.500) && (epsilon < 6.200) ) num_lin = 6; |
| 1117 |
if ( (epsilon >= 6.200) && (epsilon < 14.00) ) num_lin = 7; |
| 1118 |
|
| 1119 |
for (i=0;i<5;i++) |
| 1120 |
for (j=0;j<4;j++) |
| 1121 |
{ |
| 1122 |
x[i][j] = *(coeff_perez + 20*num_lin + 4*i +j); |
| 1123 |
/* printf("x %d %d vaut %f\n",i,j,x[i][j]); */ |
| 1124 |
} |
| 1125 |
|
| 1126 |
|
| 1127 |
if (num_lin) |
| 1128 |
{ |
| 1129 |
for (i=0;i<5;i++) |
| 1130 |
*(c_perez+i) = x[i][0] + x[i][1]*Z + Delta * (x[i][2] + x[i][3]*Z); |
| 1131 |
|
| 1132 |
} |
| 1133 |
else |
| 1134 |
{ |
| 1135 |
*(c_perez+0) = x[0][0] + x[0][1]*Z + Delta * (x[0][2] + x[0][3]*Z); |
| 1136 |
*(c_perez+1) = x[1][0] + x[1][1]*Z + Delta * (x[1][2] + x[1][3]*Z); |
| 1137 |
*(c_perez+4) = x[4][0] + x[4][1]*Z + Delta * (x[4][2] + x[4][3]*Z); |
| 1138 |
*(c_perez+2) = exp( pow(Delta*(x[2][0]+x[2][1]*Z),x[2][2])) - x[2][3]; |
| 1139 |
*(c_perez+3) = -exp( Delta*(x[3][0]+x[3][1]*Z) )+x[3][2]+Delta*x[3][3]; |
| 1140 |
|
| 1141 |
|
| 1142 |
} |
| 1143 |
|
| 1144 |
|
| 1145 |
return; |
| 1146 |
} |
| 1147 |
|
| 1148 |
|
| 1149 |
/* degrees into radians */ |
| 1150 |
double radians(double degres) |
| 1151 |
{ |
| 1152 |
return degres*M_PI/180.0; |
| 1153 |
} |
| 1154 |
|
| 1155 |
/* radian into degrees */ |
| 1156 |
double degres(double radians) |
| 1157 |
{ |
| 1158 |
return radians/M_PI*180.0; |
| 1159 |
} |
| 1160 |
|
| 1161 |
/* calculation of the angles dzeta and gamma */ |
| 1162 |
void theta_phi_to_dzeta_gamma(double theta,double phi,double *dzeta,double *gamma, double Z) |
| 1163 |
{ |
| 1164 |
*dzeta = theta; /* dzeta = phi */ |
| 1165 |
if ( (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)) > 1 && (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi) < 1.1 ) ) |
| 1166 |
*gamma = 0; |
| 1167 |
else if ( (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)) > 1.1 ) |
| 1168 |
{ |
| 1169 |
printf("error in calculation of gamma (angle between point and sun"); |
| 1170 |
exit(3); |
| 1171 |
} |
| 1172 |
else |
| 1173 |
*gamma = acos(cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)); |
| 1174 |
} |
| 1175 |
|
| 1176 |
|
| 1177 |
/********************************************************************************/ |
| 1178 |
/* Fonction: theta_ordered */ |
| 1179 |
/* */ |
| 1180 |
/* In: char *filename */ |
| 1181 |
/* */ |
| 1182 |
/* Out: float * */ |
| 1183 |
/* */ |
| 1184 |
/* Update: 29/08/93 */ |
| 1185 |
/* */ |
| 1186 |
/* Rem: theta en degres */ |
| 1187 |
/* */ |
| 1188 |
/* But: fournit les valeurs de theta du fichier d'entree a la memoire */ |
| 1189 |
/* */ |
| 1190 |
/********************************************************************************/ |
| 1191 |
float *theta_ordered(char *filename) |
| 1192 |
{ |
| 1193 |
int i; |
| 1194 |
float buffer,*ptr; |
| 1195 |
FILE *file_in; |
| 1196 |
|
| 1197 |
if ( (file_in = frlibopen(filename)) == NULL ) |
| 1198 |
{ |
| 1199 |
fprintf(stderr,"Cannot open file %s in function theta_ordered\n",filename); |
| 1200 |
exit(1); |
| 1201 |
} |
| 1202 |
|
| 1203 |
skip_comments(file_in); |
| 1204 |
|
| 1205 |
if ( (ptr = malloc(145*sizeof(float))) == NULL ) |
| 1206 |
{ |
| 1207 |
fprintf(stderr,"Out of memory in function theta_ordered\n"); |
| 1208 |
exit(1); |
| 1209 |
} |
| 1210 |
|
| 1211 |
for (i=0;i<145;i++) |
| 1212 |
{ |
| 1213 |
fscanf(file_in,"%f",&buffer); |
| 1214 |
*(ptr+i) = buffer; |
| 1215 |
fscanf(file_in,"%f",&buffer); |
| 1216 |
} |
| 1217 |
|
| 1218 |
fclose(file_in); |
| 1219 |
return ptr; |
| 1220 |
} |
| 1221 |
|
| 1222 |
|
| 1223 |
/********************************************************************************/ |
| 1224 |
/* Fonction: phi_ordered */ |
| 1225 |
/* */ |
| 1226 |
/* In: char *filename */ |
| 1227 |
/* */ |
| 1228 |
/* Out: float * */ |
| 1229 |
/* */ |
| 1230 |
/* Update: 29/08/93 */ |
| 1231 |
/* */ |
| 1232 |
/* Rem: valeurs de Phi en DEGRES */ |
| 1233 |
/* */ |
| 1234 |
/* But: mettre les angles contenus dans le fichier d'entree dans la memoire */ |
| 1235 |
/* */ |
| 1236 |
/********************************************************************************/ |
| 1237 |
float *phi_ordered(char *filename) |
| 1238 |
{ |
| 1239 |
int i; |
| 1240 |
float buffer,*ptr; |
| 1241 |
FILE *file_in; |
| 1242 |
|
| 1243 |
if ( (file_in = frlibopen(filename)) == NULL ) |
| 1244 |
{ |
| 1245 |
fprintf(stderr,"Cannot open file %s in function phi_ordered\n",filename); |
| 1246 |
exit(1); |
| 1247 |
} |
| 1248 |
|
| 1249 |
skip_comments(file_in); |
| 1250 |
|
| 1251 |
if ( (ptr = malloc(145*sizeof(float))) == NULL ) |
| 1252 |
{ |
| 1253 |
fprintf(stderr,"Out of memory in function phi_ordered"); |
| 1254 |
exit(1); |
| 1255 |
} |
| 1256 |
|
| 1257 |
for (i=0;i<145;i++) |
| 1258 |
{ |
| 1259 |
fscanf(file_in,"%f",&buffer); |
| 1260 |
fscanf(file_in,"%f",&buffer); |
| 1261 |
*(ptr+i) = buffer; |
| 1262 |
} |
| 1263 |
|
| 1264 |
fclose(file_in); |
| 1265 |
return ptr; |
| 1266 |
} |
| 1267 |
|
| 1268 |
|
| 1269 |
/********************************************************************************/ |
| 1270 |
/* Fonction: integ_lv */ |
| 1271 |
/* */ |
| 1272 |
/* In: float *lv,*theta */ |
| 1273 |
/* int sun_pos */ |
| 1274 |
/* */ |
| 1275 |
/* Out: double */ |
| 1276 |
/* */ |
| 1277 |
/* Update: 29/08/93 */ |
| 1278 |
/* */ |
| 1279 |
/* Rem: */ |
| 1280 |
/* */ |
| 1281 |
/* But: calcul l'integrale de luminance relative sans la dir. du soleil */ |
| 1282 |
/* */ |
| 1283 |
/********************************************************************************/ |
| 1284 |
double integ_lv(float *lv,float *theta) |
| 1285 |
{ |
| 1286 |
int i; |
| 1287 |
double buffer=0.0; |
| 1288 |
|
| 1289 |
for (i=0;i<145;i++) |
| 1290 |
buffer += (*(lv+i))*cos(radians(*(theta+i))); |
| 1291 |
|
| 1292 |
return buffer*2*M_PI/144; |
| 1293 |
|
| 1294 |
} |
| 1295 |
|
| 1296 |
|
| 1297 |
|
| 1298 |
|
| 1299 |
|
| 1300 |
|
| 1301 |
/* enter day number(double), return E0 = square(R0/R): eccentricity correction factor */ |
| 1302 |
|
| 1303 |
double get_eccentricity() |
| 1304 |
{ |
| 1305 |
double day_angle; |
| 1306 |
double E0; |
| 1307 |
|
| 1308 |
day_angle = 2*M_PI*(daynumber - 1)/365; |
| 1309 |
E0 = 1.00011+0.034221*cos(day_angle)+0.00128*sin(day_angle)+ |
| 1310 |
0.000719*cos(2*day_angle)+0.000077*sin(2*day_angle); |
| 1311 |
|
| 1312 |
return (E0); |
| 1313 |
|
| 1314 |
} |
| 1315 |
|
| 1316 |
|
| 1317 |
/* enter sunzenith angle (degrees) return relative air mass (double) */ |
| 1318 |
double air_mass() |
| 1319 |
{ |
| 1320 |
double m; |
| 1321 |
|
| 1322 |
if (sunzenith>90) |
| 1323 |
{ |
| 1324 |
fprintf(stderr, "solar zenith angle larger than 90� in fuction air_mass():\n the models used are not more valid\n"); |
| 1325 |
exit(1); |
| 1326 |
} |
| 1327 |
|
| 1328 |
m = 1/( cos(sunzenith*M_PI/180)+0.15*exp( log(93.885-sunzenith)*(-1.253) ) ); |
| 1329 |
return(m); |
| 1330 |
} |
| 1331 |
|
| 1332 |
|
| 1333 |
double get_angle_sun_direction(double sun_zenith, double sun_azimut, double direction_zenith, double direction_azimut) |
| 1334 |
|
| 1335 |
{ |
| 1336 |
|
| 1337 |
double angle; |
| 1338 |
|
| 1339 |
|
| 1340 |
if (sun_zenith == 0) |
| 1341 |
puts("WARNING: zenith_angle = 0 in function get_angle_sun_vert_plan"); |
| 1342 |
|
| 1343 |
angle = acos( cos(sun_zenith*M_PI/180)*cos(direction_zenith*M_PI/180) + sin(sun_zenith*M_PI/180)*sin(direction_zenith*M_PI/180)*cos((sun_azimut-direction_azimut)*M_PI/180) ); |
| 1344 |
angle = angle*180/M_PI; |
| 1345 |
return(angle); |
| 1346 |
} |
| 1347 |
|
| 1348 |
|
| 1349 |
|
| 1350 |
|
| 1351 |
|
| 1352 |
|
| 1353 |
|
| 1354 |
|
