A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
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For the final detailed per<strong>for</strong>mance calculation on the optimized system, the<br />
input set of Table A-2 is included. ITAPE=3 specifies that a user defined sys-<br />
tem is to be read from the file on Unit 30, and TDESP indicates the power level<br />
in MW of the system to be analyzed. IPROB=O specifies that an annual per<strong>for</strong>-<br />
mance is desired. Since a flux map is desired, the flux calculation must be turned<br />
on with IFLX=l, where IFXOUT determines which point in time is to be used<br />
<strong>for</strong> the flux calculation. The flux point positions default to the positions defined<br />
in the previous optimization calculation, since they are not specifically redefined.<br />
Comments on Output<br />
The initial output is similar to the output of Problems la and 2a. Note that<br />
the code chose the same system design as in Problem 2a. The smart user proba-<br />
bly would have used a finer grid of flux test points and of tower height and aper-<br />
ture width optimization variables to further refine the system in this step.<br />
The <strong>for</strong>m of the remaining output is the same as <strong>for</strong> Problem lb. The opti-<br />
mized storage size is printed at the front of the annual power <strong>prod</strong>uction table. In<br />
this case the size was unchanged from that <strong>for</strong> the longest day of the year (used<br />
earlier during system optimization). If the storage size had changed due to opti-<br />
mization, the cost numbers also printed there would have been adjusted by the<br />
code and would no longer have matched those numbers printed as part of system<br />
optimization output. These new numbers are the best numbers DELSOL can pro-<br />
vide. The levelized cost of energy printed here may also be different because the<br />
final per<strong>for</strong>mance calculation predicts a more accurate annual energy estimate,<br />
which is printed in the yearly energy <strong>prod</strong>uction summary and is used in this en-<br />
ergy cost calculation.<br />
The flux map shows that at angles greater than those by which the field<br />
"sees" the cavity wall, flux is negligible. However, at the top of the wall the flux<br />
is still significant. The user might wish to reoptimiee this system to allow a larger<br />
wall height <strong>for</strong> the same aperture dimensions. Also, Sample Problem 3b will show<br />
how to examine the roof of a similar cavity design <strong>for</strong> fluxes. The active cavity<br />
area should only be enlarged to limit fluxes on uncooled surface (such as the roof)<br />
to acceptable values. Internal reradiation will occur so that the energy incident<br />
on uncooled surfaces will mostly not be lost <strong>for</strong> power <strong>prod</strong>uction purposes.<br />
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