johnpye/nrel/asc_sunpos.c

/*  ASCEND modelling environment
    Copyright (C) 2008 Carnegie Mellon University

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2, or (at your option)
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*//** @file
    Wrapper for sunpos_nrel.c to allow access to the calculation from ASCEND.
*/

/* include the external function API from libascend... */
#include <ascend/compiler/extfunc.h>

/* include error reporting API as well, so we can send messages to user */
#include <ascend/utilities/error.h>

/* for accessing the DATA instance */
#include <ascend/compiler/child.h>
#include <ascend/general/list.h>
#include <ascend/compiler/module.h>
#include <ascend/compiler/childinfo.h>
#include <ascend/compiler/parentchild.h>
#include <ascend/compiler/slist.h>
#include <ascend/compiler/type_desc.h>
#include <ascend/compiler/packages.h>
#include <ascend/compiler/symtab.h>
#include <ascend/compiler/instquery.h>
#include <ascend/compiler/instmacro.h>
#include <ascend/compiler/instance_types.h>

/* the code that we're wrapping... */
#include "spa.h"

#ifndef PI
# define PI 3.14159265358979
#endif

static ExtBBoxInitFunc sunpos_nrel_prepare;
static ExtBBoxFunc sunpos_nrel_calc;
static ExtBBoxInitFunc julian_day_nrel_prepare;
static ExtBBoxFunc julian_day_nrel_calc;

static const char *sunpos_nrel_help = "\
Calculate sun position using NREL SPA code. Inputs are:\n\
  * time (relative to reference time)\n\
  * pressure (instantaneous atmospheric pressure)\n\
  * temperature (instantaneous absolute atmospheric temperature)\n\
  * reference time (Julian Day value expressed as seconds)\n\
The reference time allows this function to use the same time variable as the\
rest of your simulation; the reference time is expected to be pre-calculated\
from a year-month-day calculation (see 'julian_day_nrel' external relation).";

static const char *julian_day_nrel_help = "Calculate the Julian Day from "
    "year, month, day, hour, minute, second and timezone inputs. "
    "Intended for once-off use in ASCEND models to calculate the time offset "
    "eg for the start of a weather file. Acceptable dates are in the range "
    "of -2000 BC to AD 6000. All of the inputs should be as 'factor' type "
    "variables (to avoid needless time unit conversions), except for the "
    "timezone, which should be in time units eg '8{h}'.";

/*------------------------------------------------------------------------------
  REGISTRATION FUNCTION
*/

/**
    This is the function called from 'IMPORT "johnpye/nrel/sunpos_nrels";'

    It sets up the functions contained in this external library
*/
extern
ASC_EXPORT int sunpos_nrel_register(){
    int result = 0;

    ERROR_REPORTER_HERE(ASC_USER_WARNING,"SUNPOS_NREL is still EXPERIMENTAL. Use with caution.\n");

#define CALCFN(NAME,INPUTS,OUTPUTS) \
    result += CreateUserFunctionBlackBox(#NAME \
        , NAME##_prepare \
        , NAME##_calc /* value */ \
        , (ExtBBoxFunc*)NULL /* derivatives not provided yet*/ \
        , (ExtBBoxFunc*)NULL /* hessian not provided yet */ \
        , (ExtBBoxFinalFunc*)NULL /* finalisation not implemented */ \
        , INPUTS,OUTPUTS /* inputs, outputs */ \
        , NAME##_help /* help text */ \
        , 0.0 \
    ) /* returns 0 on success */

    CALCFN(sunpos_nrel,4,2);
    CALCFN(julian_day_nrel,7,1);

#undef CALCFN

    if(result){
        ERROR_REPORTER_HERE(ASC_PROG_NOTE,"CreateUserFunction result = %d\n",result);
    }
    return result;
}

#define GET_CHILD_VAL(NAME) \
    inst = ChildByChar(data,AddSymbol(#NAME)); \
    if(!inst){ \
        ERROR_REPORTER_HERE(ASC_USER_ERROR \
            ,"Couldn't locate '" #NAME "' in DATA, please check usage of SUNPOS."\
        );\
        return 1;\
    }\
    if(InstanceKind(inst)!=REAL_CONSTANT_INST){\
        ERROR_REPORTER_HERE(ASC_USER_ERROR,"DATA member '" #NAME "' must be a real_constant");\
        return 1;\
    }\
    NAME = RC_INST(inst)->value;

/**
    This function is called when the black-box relation is being instantiated.

    This just gets the data member and checks that it's valid, and stores
    it in the blackbox data field.
*/
static int sunpos_nrel_prepare(struct BBoxInterp *bbox,
       struct Instance *data,
       struct gl_list_t *arglist
){
    struct Instance *inst;
    double latitude, longitude, elevation;

    /* get the latitude */
    GET_CHILD_VAL(latitude);
    CONSOLE_DEBUG("Latitude: %0.3f",latitude);
    if(latitude > PI/2 || latitude < -PI/2){
        ERROR_REPORTER_HERE(ASC_USER_ERROR,"'latitude' is out of allowable range -PI/2 to PI/2.");
        return 1;
    }

    /* get the longitude */
    GET_CHILD_VAL(longitude);
    CONSOLE_DEBUG("Longitude: %0.3f",longitude);
    if(longitude > PI || longitude < -PI){
        ERROR_REPORTER_HERE(ASC_USER_ERROR,"'latitude' is out of allowable range -PI to PI.");
        return 1;
    }

    /* get the elevation */
    GET_CHILD_VAL(elevation);
    CONSOLE_DEBUG("Elevation: %0.3f m",elevation);
    if(elevation < -6500000){
        ERROR_REPORTER_HERE(ASC_USER_ERROR,"'elevation' is out of allowable range (must be > -6,500 km)");
        return 1;
    }

    spa_data *S = ASC_NEW(spa_data);
    S->latitude = latitude * 180/PI;
    S->longitude = longitude * 180/PI;
    S->elevation = elevation;
    S->function = SPA_ZA_JD;

    ERROR_REPORTER_HERE(ASC_PROG_NOTE,"Prepared position for sun position.\n");
    bbox->user_data = (void *)S;
    return 0;
}

#define CALCPREPARE(NIN,NOUT) \
    /* a few checks about the input requirements */ \
    if(ninputs != NIN)return -1; \
    if(noutputs != NOUT)return -2; \
    if(inputs==NULL)return -3; \
    if(outputs==NULL)return -4; \
    if(bbox==NULL)return -5; \
    \
    /* the 'user_data' in the black box object will contain the */\
    /* coefficients required for this fluid; cast it to the required form: */\
    const spa_data *sunpos1 = (const spa_data *)bbox->user_data


/**
    Evaluation function for 'sunpos'
    @return 0 on success
*/
static int sunpos_nrel_calc(struct BBoxInterp *bbox,
        int ninputs, int noutputs,
        double *inputs, double *outputs,
        double *jacobian
){
    CALCPREPARE(4,2);

    double t, p, T, t_offset;

    t = inputs[0]; /* convert from JD seconds to JD days */
    p = inputs[1] / 100. /* convert Pa to mbar */;
    T = inputs[2] - 273.15 /* convert ��C to K */;
    t_offset = inputs[3];

    spa_data S = *sunpos1;
    S.pressure = p;
    S.temperature = T;
    S.jd = (t + t_offset) / 3600 / 24; /* convert to days */

    int res = spa_calculate(&S);
    CONSOLE_DEBUG("Sun position: t = %f JD, p  %f mbar, T = %f C: res = %d, az = %f, zen = %f",t, p, T, res, S.azimuth, S.zenith);

    /* returned values are in degrees, need to convert back to base SI: radians */
    outputs[0] = S.zenith * PI/180.;
    outputs[1] = S.azimuth180 * PI/180.;

    /* 0 on success, non-zero is error code from spa_calculate (would prob be input parameters out-of-range) */
    return res;
}

/*---------- SUNPOS_JULIAN_DAY ------------*/

static int julian_day_nrel_prepare(struct BBoxInterp *bbox,
       struct Instance *data,
       struct gl_list_t *arglist
){
    bbox->user_data = NULL;
    return 0;
}

static int julian_day_nrel_calc(struct BBoxInterp *bbox,
        int ninputs, int noutputs,
        double *inputs, double *outputs,
        double *jacobian
){
    CALCPREPARE(7,1);
    (void)sunpos1;

    int y,mon,d,h,m,s;
    double tz;

    y = inputs[0]; /* convert from seconds to years */
    mon = inputs[1]; /* convert from seconds to months */ 
    d = inputs[2]; /* convert from seconds to days */
    h = inputs[3]; /* seconds to hours */
    m = inputs[4]; /* seconds to minutes */
    s = inputs[5];
    tz = inputs[6] / 3600.; /* seconds to hours */

    double t = julian_day(y,mon,d, h,m,s, tz) * 3600 * 24;
    
    outputs[0] = t;
    return 0;
}


1	/* ASCEND modelling environment
2	Copyright (C) 2008 Carnegie Mellon University
3
4	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2, or (at your option)
7	any later version.
8
9	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.
13
14	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software
16	Foundation, Inc., 59 Temple Place - Suite 330,
17	Boston, MA 02111-1307, USA.
18	//* @file
19	Wrapper for sunpos_nrel.c to allow access to the calculation from ASCEND.
20	*/
21
22	/* include the external function API from libascend... */
23	#include <ascend/compiler/extfunc.h>
24
25	/* include error reporting API as well, so we can send messages to user */
26	#include <ascend/utilities/error.h>
27
28	/* for accessing the DATA instance */
29	#include <ascend/compiler/child.h>
30	#include <ascend/general/list.h>
31	#include <ascend/compiler/module.h>
32	#include <ascend/compiler/childinfo.h>
33	#include <ascend/compiler/parentchild.h>
34	#include <ascend/compiler/slist.h>
35	#include <ascend/compiler/type_desc.h>
36	#include <ascend/compiler/packages.h>
37	#include <ascend/compiler/symtab.h>
38	#include <ascend/compiler/instquery.h>
39	#include <ascend/compiler/instmacro.h>
40	#include <ascend/compiler/instance_types.h>
41
42	/* the code that we're wrapping... */
43	#include "spa.h"
44
45	#ifndef PI
46	# define PI 3.14159265358979
47	#endif
48
49	static ExtBBoxInitFunc sunpos_nrel_prepare;
50	static ExtBBoxFunc sunpos_nrel_calc;
51	static ExtBBoxInitFunc julian_day_nrel_prepare;
52	static ExtBBoxFunc julian_day_nrel_calc;
53
54	static const char *sunpos_nrel_help = "\
55	Calculate sun position using NREL SPA code. Inputs are:\n\
56	* time (relative to reference time)\n\
57	* pressure (instantaneous atmospheric pressure)\n\
58	* temperature (instantaneous absolute atmospheric temperature)\n\
59	* reference time (Julian Day value expressed as seconds)\n\
60	The reference time allows this function to use the same time variable as the\
61	rest of your simulation; the reference time is expected to be pre-calculated\
62	from a year-month-day calculation (see 'julian_day_nrel' external relation).";
63
64	static const char *julian_day_nrel_help = "Calculate the Julian Day from "
65	"year, month, day, hour, minute, second and timezone inputs. "
66	"Intended for once-off use in ASCEND models to calculate the time offset "
67	"eg for the start of a weather file. Acceptable dates are in the range "
68	"of -2000 BC to AD 6000. All of the inputs should be as 'factor' type "
69	"variables (to avoid needless time unit conversions), except for the "
70	"timezone, which should be in time units eg '8{h}'.";
71
72	/*------------------------------------------------------------------------------
73	REGISTRATION FUNCTION
74	*/
75
76	/**
77	This is the function called from 'IMPORT "johnpye/nrel/sunpos_nrels";'
78
79	It sets up the functions contained in this external library
80	*/
81	extern
82	ASC_EXPORT int sunpos_nrel_register(){
83	int result = 0;
84
85	ERROR_REPORTER_HERE(ASC_USER_WARNING,"SUNPOS_NREL is still EXPERIMENTAL. Use with caution.\n");
86
87	#define CALCFN(NAME,INPUTS,OUTPUTS) \
88	result += CreateUserFunctionBlackBox(#NAME \
89	, NAME##_prepare \
90	, NAME##_calc /* value */ \
91	, (ExtBBoxFunc)NULL / derivatives not provided yet*/ \
92	, (ExtBBoxFunc)NULL / hessian not provided yet */ \
93	, (ExtBBoxFinalFunc)NULL / finalisation not implemented */ \
94	, INPUTS,OUTPUTS /* inputs, outputs */ \
95	, NAME##_help /* help text */ \
96	, 0.0 \
97	) /* returns 0 on success */
98
99	CALCFN(sunpos_nrel,4,2);
100	CALCFN(julian_day_nrel,7,1);
101
102	#undef CALCFN
103
104	if(result){
105	ERROR_REPORTER_HERE(ASC_PROG_NOTE,"CreateUserFunction result = %d\n",result);
106	}
107	return result;
108	}
109
110	#define GET_CHILD_VAL(NAME) \
111	inst = ChildByChar(data,AddSymbol(#NAME)); \
112	if(!inst){ \
113	ERROR_REPORTER_HERE(ASC_USER_ERROR \
114	,"Couldn't locate '" #NAME "' in DATA, please check usage of SUNPOS."\
115	);\
116	return 1;\
117	}\
118	if(InstanceKind(inst)!=REAL_CONSTANT_INST){\
119	ERROR_REPORTER_HERE(ASC_USER_ERROR,"DATA member '" #NAME "' must be a real_constant");\
120	return 1;\
121	}\
122	NAME = RC_INST(inst)->value;
123
124	/**
125	This function is called when the black-box relation is being instantiated.
126
127	This just gets the data member and checks that it's valid, and stores
128	it in the blackbox data field.
129	*/
130	static int sunpos_nrel_prepare(struct BBoxInterp *bbox,
131	struct Instance *data,
132	struct gl_list_t *arglist
133	){
134	struct Instance *inst;
135	double latitude, longitude, elevation;
136
137	/* get the latitude */
138	GET_CHILD_VAL(latitude);
139	CONSOLE_DEBUG("Latitude: %0.3f",latitude);
140	if(latitude > PI/2 \|\| latitude < -PI/2){
141	ERROR_REPORTER_HERE(ASC_USER_ERROR,"'latitude' is out of allowable range -PI/2 to PI/2.");
142	return 1;
143	}
144
145	/* get the longitude */
146	GET_CHILD_VAL(longitude);
147	CONSOLE_DEBUG("Longitude: %0.3f",longitude);
148	if(longitude > PI \|\| longitude < -PI){
149	ERROR_REPORTER_HERE(ASC_USER_ERROR,"'latitude' is out of allowable range -PI to PI.");
150	return 1;
151	}
152
153	/* get the elevation */
154	GET_CHILD_VAL(elevation);
155	CONSOLE_DEBUG("Elevation: %0.3f m",elevation);
156	if(elevation < -6500000){
157	ERROR_REPORTER_HERE(ASC_USER_ERROR,"'elevation' is out of allowable range (must be > -6,500 km)");
158	return 1;
159	}
160
161	spa_data *S = ASC_NEW(spa_data);
162	S->latitude = latitude * 180/PI;
163	S->longitude = longitude * 180/PI;
164	S->elevation = elevation;
165	S->function = SPA_ZA_JD;
166
167	ERROR_REPORTER_HERE(ASC_PROG_NOTE,"Prepared position for sun position.\n");
168	bbox->user_data = (void *)S;
169	return 0;
170	}
171
172	#define CALCPREPARE(NIN,NOUT) \
173	/* a few checks about the input requirements */ \
174	if(ninputs != NIN)return -1; \
175	if(noutputs != NOUT)return -2; \
176	if(inputs==NULL)return -3; \
177	if(outputs==NULL)return -4; \
178	if(bbox==NULL)return -5; \
179	\
180	/* the 'user_data' in the black box object will contain the */\
181	/* coefficients required for this fluid; cast it to the required form: */\
182	const spa_data sunpos1 = (const spa_data )bbox->user_data
183
184
185	/**
186	Evaluation function for 'sunpos'
187	@return 0 on success
188	*/
189	static int sunpos_nrel_calc(struct BBoxInterp *bbox,
190	int ninputs, int noutputs,
191	double inputs, double outputs,
192	double *jacobian
193	){
194	CALCPREPARE(4,2);
195
196	double t, p, T, t_offset;
197
198	t = inputs[0]; /* convert from JD seconds to JD days */
199	p = inputs[1] / 100. /* convert Pa to mbar */;
200	T = inputs[2] - 273.15 /* convert ��C to K */;
201	t_offset = inputs[3];
202
203	spa_data S = *sunpos1;
204	S.pressure = p;
205	S.temperature = T;
206	S.jd = (t + t_offset) / 3600 / 24; /* convert to days */
207
208	int res = spa_calculate(&S);
209	CONSOLE_DEBUG("Sun position: t = %f JD, p %f mbar, T = %f C: res = %d, az = %f, zen = %f",t, p, T, res, S.azimuth, S.zenith);
210
211	/* returned values are in degrees, need to convert back to base SI: radians */
212	outputs[0] = S.zenith * PI/180.;
213	outputs[1] = S.azimuth180 * PI/180.;
214
215	/* 0 on success, non-zero is error code from spa_calculate (would prob be input parameters out-of-range) */
216	return res;
217	}
218
219	/---------- SUNPOS_JULIAN_DAY ------------/
220
221	static int julian_day_nrel_prepare(struct BBoxInterp *bbox,
222	struct Instance *data,
223	struct gl_list_t *arglist
224	){
225	bbox->user_data = NULL;
226	return 0;
227	}
228
229	static int julian_day_nrel_calc(struct BBoxInterp *bbox,
230	int ninputs, int noutputs,
231	double inputs, double outputs,
232	double *jacobian
233	){
234	CALCPREPARE(7,1);
235	(void)sunpos1;
236
237	int y,mon,d,h,m,s;
238	double tz;
239
240	y = inputs[0]; /* convert from seconds to years */
241	mon = inputs[1]; /* convert from seconds to months */
242	d = inputs[2]; /* convert from seconds to days */
243	h = inputs[3]; /* seconds to hours */
244	m = inputs[4]; /* seconds to minutes */
245	s = inputs[5];
246	tz = inputs[6] / 3600.; /* seconds to hours */
247
248	double t = julian_day(y,mon,d, h,m,s, tz) * 3600 * 24;
249
250	outputs[0] = t;
251	return 0;
252	}
253
254