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Sample Problem 4 - User Defined Field with Individual Heliostat Coordinates
Problem Statement
The example of the CESA-1 system discussed in Chapter VI1 and Reference
43 is used here to illustrate the input and output of the IUSERF=3 option in
$FIELD$. The performance and a flux map on winter solstice at 10 a.m. are
desired. The insolation is 0.7 kw/m2, and a square wave sun is to be assumed.
Other information comes from Reference 43.
Input Cards
SAMPLE PROBLEM 4
$BASIC IPROB-2, UDAY=355., UTIME=-2.. IPRINT=2.
PLAT137.099. INSOL=2. SOLCON-0.7. NSUN=2.
IATM=2. ATM1=0.679.ATM2=11.76,ATM3=-1.97.
ATM4=O. $
SFIELO IUSERF=3 S
SHSTAT WM=6.25. HM=8.3. ICPANL-1. WPANL=P.B. HPANL=1.25.
HXCANT=5*-1.675. 5*1.675. HYCANT=2.525. 1.263.
0.,-1.263.-2.525,2.525,1.263,0.,-~.263,-2.525,
DENSMR=0.92063. RMIRL=0.85. SIGAZ-0.. SIGEL=O.,
SIGSX=O., SIGSY=O., SIGTX=0.0033. SIGTY=0.0033,
ICANT=3. NCANTY=5. ISB=l $
$REC THT~56.345. TOWL=67.345. TOWD=11., IREC=4,
W=10.8, RX.3.4. RY=3.4. IAUTOP-0. RELVz111.8 $
$NLFLUX IFLX=l. IFXOUT(1,1)=1. IFLAUT=4. NXFLX-11.
FAZMIN=-1.7. FAZMAX=I.7. NYFLX=Il. FZMINZ-1.7,
FZMAX-1.7 8
ONLEFF $
SPANISH FIELD
282
1
0.0
10.0
20.0
30.0
-30.0
-20.0
- 10.0
2
5.0
16
7
45.
45.
45.
45.
45.
45.
45.
10
57.
-26.56 259.
-8.83 259.
BREC W=-IOO. $
Analvsis of Input
85.0
85.0
85.0
85.0
85.0
85.0
85.0
85.0
255.0
255.0
The detailed input describing the site location, sunshape, atmospheric atten-
uation ($BASIC$), the heliostat ($HSTAT$), and tower and receiver ($REC$)
are consistent with the system definition of Reference 43. To calculate the perfor-
mance and flux at a particular time, IPROB=2, UDAY, and UTIME are specified
in $BASIC$. IPRINT is set to 2 in order to get the single time results printed.
IUSERF=3 in $FIELD$ sets up the code to do a run on a field with the individ-
ual heliostat coordinates defined. The values defined in $NLFLUX$ are chosen for
a finely gridded flux map. After $NLEFF$ comes the individual heliostat input in
the format described in the $FIELD$ section of Appendix A. Only the first few
values are shown here. For each heliostat, the focal length must be defined, or the
heliostat will be defocused.
2 18