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

an optimum storage size based on energy cost. At the conclusion of this optimiza-
tion, storage capital costs and energy costs are adjusted to account for the opti-
mized storage.
The last step in finding an optimized system using DELSOL is to determine a
more accurate performance of the chosen system by doing a final detailed perfor-
mance calculation (IPROBZ4). For this calculation, the system definition must
be read from a file which was created during system optimization. This is done
by specifying ITAPE=3 in Namelist BASIC. No parameters should be changed or
specified on the namelist input which would change the system in any way. How-
ever, different aiming strategies can be examined and different flux point locations
can be requested, although varying aiming strategies may cause receiver flux lim-
its to be exceeded.
During a final performance calculation, field and system performances are
again calculated at points in time, as during an initial performance calculation.
However, now that a specific system has been defined, an average annual per-
formance can be calculated as well, if IPROB=O. Furthermore, if IPROB=O, an
annual energy detailed summary is provided, and a more accurate calculation of
annual energy is done. Both of these calculations are done at several times dur-
ing several days to get a good energy prediction for this specific system. Since
this annual energy calculation is more accurate than that used during system
optimization, energy costs are recalculated using this energy value and the costs
which were calculated during the optimization.
A detailed flux map on the receiver will be provided during a final perfor-
mance calculation if requested by the user. This flux map will reflect the aiming
strategy specified by the user, and will only represent one point in time. If a flux
map for a different time is desired, a separate performance calculation is required
for generation of that flux map. Further, the flux will always be calculated using
REFSOL insolation for a system which was previously optimized by DELSOL,
so that the flux map must be manually adjusted if a time having a lower insola-
tion is of interest. Finally, flux maps at different locations can be generated (one
per performance calculation), which might, be useful in modifying the interior of a
cavity receiver.
V1.A. Descrbtion of Files Used/Created by DELSOL
Several files are created or used by the DELSOL computer code during ex-
ecution of different parts of the code. Briefly, there is an input file, an output
file, an interactive file, a file to which an initial performance of a system is writ-
ten, a comparable file from which a previous initial performance is read, a file to
and from which an optimized system is written/read, a file to which an azimuth-
elevation table of field performance is written, a file to which only a flux map is
written, and an internal scratch file.
V1.A-I. Input File (Unit 5)-This file is a formatted file, created by the user,
which contains all of the namelist input data required to run a particular job.
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