A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...

NAZM = 12
AMAXN = 82.5"
11.23-2 Field Options-The number of heliostat zones is based on the specifi-
cations of NRAD and NAZM. For design and optimization runs, a circular field
of zones is required, although the field can be a surround (INORTH=O) or north
(INORTII-1) field. In this case, NRAD remains constant around the circumfer-
ence. For a performance run, it is possible to define a non-circular zonal configu-
ration by specifying IUSERF=l.
Although a heliostat field must be contained within the heliostat zone con-
figuration chosen, the field does not have to occupy every zone. The variable
IUSERF (namelist FIELD) in general is used to determine the relationship be-
tween the heliostat zone pattern and the actual heliostat field layout that deter-
mines field performance, as follows:
a) IUSERF=O
The user specifies RADMIN, RADMAX, NRAD, NAZM, and INORTH. No
field boundaries are provided with this option, so the field boundaries are as-
sumed to be the zone configuration boundaries. The code calculates and reports
only the zone by zone performance for the symmetric grid defined by the five in-
put variables above. Average field performance is meaningless in this case and
therefore is not calculated. This option must be used for any initial performance
run which will be used later for a field buildup (optimization) run. The best
guess receiver and tower dimensions should be specified in conjunction with us-
ing this option.
6) IUSERF=I
The code defined north biased surround field of Figure 11-6 is used. User spec-
ifications of the field variables RADMIN, RADMAX, NRAD, NAZM, INORTH,
NRADMN, and NRADMX are ignored. That is, the zonal configuration cannot
be changed from that of Figure 11-6. The layout is typical of fields required for
larger industrial or electrical power plants (greater than about 250 MWth or 100
M We, from Reference 9). Field averaged performance is calculated and reported.
This option can only be used for an independent performance run in which the
field is defined by the user with the variables DENSIT, AZMSEP, and FLAND.
This option should not be used during a performance rerun of a system which has
been previously optimized by DELSOL. The best guess receiver and tower dimen-
sions should be specified in conjunction with using this option.
c) IUSER F=Z
This option allows the user to define a field zone by zone. The field definition
can be specified directly by the user in a performance calculation or can be ob-
tained from the results of a DELSOL optimization during a performance rerun.
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