| 29 |
|
][ |
| 30 |
|
.B "-o{f|d}" |
| 31 |
|
][ |
| 32 |
< |
.B "-O{0|1}" |
| 32 |
> |
.B "\-O{0|1}" |
| 33 |
> |
][ |
| 34 |
> |
.B "\-i intvl" |
| 35 |
|
] |
| 36 |
|
[ |
| 37 |
|
.B "tape.wea" |
| 38 |
+ |
or |
| 39 |
+ |
.B "tape.epw" |
| 40 |
|
] |
| 41 |
|
.SH DESCRIPTION |
| 42 |
|
.I Gendaymtx |
| 43 |
|
takes a weather tape as input and produces a matrix of sky patch |
| 44 |
|
values using the Perez all-weather model. |
| 45 |
< |
The weather tape is assumed to be in the simple ASCII format understood |
| 45 |
> |
The weather tape may be in the simple ASCII format understood |
| 46 |
|
by DAYSIM, which contains a short header with the site parameters followed |
| 47 |
|
by the month, day, standard time, direct normal and diffuse horizontal |
| 48 |
|
irradiance values, one time step per line. |
| 49 |
+ |
Alternatively, a standard EPW (Energy Plus Weather) input may be provided, |
| 50 |
+ |
in which case additional information such as the dew point temperature may |
| 51 |
+ |
be used in the calculation. |
| 52 |
|
Each time step line is used to compute a column in the output matrix, |
| 53 |
|
where rows correspond to sky patch positions, starting with 0 for |
| 54 |
|
the ground and continuing to 145 for the zenith using the default |
| 88 |
|
.I "\-g 0.2 0.2 0.2" |
| 89 |
|
corresponding to a 20% gray. |
| 90 |
|
.PP |
| 91 |
+ |
If there is a sun in the description, |
| 92 |
+ |
.I gendaymtx |
| 93 |
+ |
will include its contribution in the four nearest sky patches, |
| 94 |
+ |
distributing energy according to centroid proximity. |
| 95 |
|
The |
| 96 |
|
.I \-d |
| 97 |
|
option may be used to produce a sun-only matrix, with no sky contributions, |
| 99 |
|
Alternatively, the |
| 100 |
|
.I \-s |
| 101 |
|
option may be used to exclude any direct solar component from the output, |
| 102 |
< |
with the rest of the sky and ground patch unaffected. |
| 92 |
< |
If there is a sun in the description, |
| 93 |
< |
.I gendaymtx |
| 94 |
< |
will include its contribution in the four nearest sky patches, |
| 95 |
< |
distributing energy according to centroid proximity. |
| 102 |
> |
with the other sky and ground patches unaffected. |
| 103 |
|
.PP |
| 104 |
|
The |
| 105 |
|
.I \-u |
| 122 |
|
.I \-D |
| 123 |
|
option may be used to specify an output file to contain a list of |
| 124 |
|
solar positions and intensities corresponding to time steps in the |
| 125 |
< |
weather tape where the sun has any portion above the horizion. |
| 125 |
> |
weather tape where the sun has any portion above the horizon. |
| 126 |
|
Sun radiance values may be zero if the direct amount is zero on the input. |
| 127 |
|
Sun modifiers and names will be indexed by the minute, numbered from |
| 128 |
|
midnight, January 1st. |
| 162 |
|
using a similar transform. |
| 163 |
|
.PP |
| 164 |
|
The |
| 165 |
+ |
.I \-i |
| 166 |
+ |
option specifies the actual capture interval in minutes of the original |
| 167 |
+ |
weather data. |
| 168 |
+ |
Please see the man page for |
| 169 |
+ |
.I gendaylit |
| 170 |
+ |
to understand this correction, which is applied only near sunrise and |
| 171 |
+ |
sunset. |
| 172 |
+ |
.PP |
| 173 |
+ |
The |
| 174 |
|
.I \-of |
| 175 |
|
or |
| 176 |
|
.I \-od |
| 206 |
|
based on Jean-Jacques Delaunay's original gendaylit(1) implementation. |
| 207 |
|
Greg Ward wrote the final parameter parsing and weather tape conversion. |
| 208 |
|
.SH "SEE ALSO" |
| 209 |
< |
dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1), |
| 210 |
< |
rcollate(1), rcontrib(1), rfluxmtx(1), xform(1) |
| 209 |
> |
dctimestep(1), genBSDF(1), gendaylit(1), gensdaymtx(1), gensky(1), |
| 210 |
> |
genskyvec(1), genssky(1), |
| 211 |
> |
rcollate(1), rcontrib(1), rfluxmtx(1), rmtxop(1), xform(1) |
