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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The next set of cards is read at the start of the optimization calculation. At<br />
this point in the calculation, the design will be affected by flux limits and aim<br />
strategies. IAUTOP=l on the $REC$ card specifies the 1-dimensional smart aim-<br />
ing option necessary <strong>for</strong> a flux limited external receiver design. In the $OPT$<br />
namelist, tower height and receiver dimensions are varied over a range compatible<br />
with the range of power levels. The variation in receiver height to width is speci-<br />
fied to allow spreading of the flux along the height. IFLX=l in $NLFLUX$ turns<br />
on the flux calculation, and the flux limit is set by FLXLIM. Since the maximum<br />
flux should occur at the center of the north panel <strong>for</strong> the default design point,<br />
only that one point is tested <strong>for</strong> flux levels. The default values in $NLFLUX$ will<br />
result in the flux being calculated at the correct point and compared to the limit<br />
FLXLIM.<br />
The absence of storage is indicated by setting SMULT=1.0 in both $OPT$<br />
and $NLEFF$. It is not necessary to set the reference costs to zero because the<br />
code will calculate zero storage costs if no energy is available to charge storage.<br />
The optimum systems <strong>for</strong> all power levels specified by the non-zero values of<br />
IPLFL will be saved on a file on Unit 30 because the value of IOTAPE=l is spec-<br />
ified.<br />
- Comments on Output<br />
The first part of the output consists of the printing of the per<strong>for</strong>mance<br />
namelists, followed by summaries of the heliostat design and receiver used in the<br />
initial per<strong>for</strong>mance calculation, zone by zone density and heliostat counts, an in-<br />
solation table, and the zone by zone yearly average per<strong>for</strong>mance. A printing of<br />
the optimization namelists follows, then a summary of the optimization variables<br />
and design constraints. The default choice of IPROPT in $OPT$ <strong>prod</strong>uces the<br />
abbreviated list indicating the combinations of optimization variables searched,<br />
along with pertinent in<strong>for</strong>mation related to each set considered.<br />
The optimization results are then presented in a series of tables. Note in the<br />
system design summary that all design variables fall within the ranges searched<br />
except <strong>for</strong> the receiver height in the three smallest power sizes, which is at the<br />
maximum allowed height to width ratio. Although energy costs would probably<br />
not change significantly, a thorough user would want to rerun this case to allow<br />
consideration of larger height to width ratios. Note also in the field layout sum-<br />
mary that the field extends to RADMAX in all cases <strong>for</strong> a number of azimuthal<br />
zones. The user could rerun this case with a larger value <strong>for</strong> RADMAX to allow<br />
the code more flexibility in zone selection <strong>for</strong> field build-up.<br />
In no case was the flux limit met <strong>for</strong> this series of calculations. It is likely<br />
that a finer grid of choices <strong>for</strong> receiver dimensions and tower height would have<br />
resulted in optimum systems in which the peak flux was much closer to the al-<br />
lowed flux on the receiver. Sample Problem lb looks at the flux distribution over<br />
the receiver <strong>for</strong> one of these systems in which the flux limit was not met.<br />
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