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 fourth major enhancement in <strong>DELSOL3</strong> is the update of most of the de-<br />
fault values in the code. As part of this update, new algorithms <strong>for</strong> calculating<br />
tower cost were included, a transition region was added between the tower and<br />
receiver, and the fixed cost algorithm was adjusted to reflect such things as struc-<br />
tures, improvements, and miscellaneous equipment. Receiver, thermal storage,<br />
heat exchanger, and turbine-generator costs were adjusted based on the Saguaro<br />
molten salt cavity design (Reference 8). Heliostat, land, and wiring default cost<br />
values were modified. Also, the default heliostat was redefined to have about 100<br />
square meters of reflective area, and the pointing errors of this heliostat were ad-<br />
justed. Certain component efficiencies were modified, and the plant factor was<br />
changed from 1.0 to 0.9 to reflect the fact that some maintenance outages will be<br />
required in any realistic power plant. Lastly, default values used <strong>for</strong> economic as-<br />
sumptions were adjusted, such as the fixed charge rate and the rates of escalation<br />
and inflation. It is important that the user of this code verify that any default<br />
values which are used in <strong>DELSOL3</strong> calculations are valid, since different economic<br />
scenarios could result in vastly different predicted energy cost values and since the<br />
relationship between component costs and efficiencies directly affects the optimum<br />
system which is chosen by <strong>DELSOL3</strong>.<br />
Finally, several other minor enhancements were made in <strong>DELSOL3</strong>, including<br />
an optional weather factor algorithm based on latitude of the plant, an additional<br />
heliostat density optimization algorithm, a mixed mode smart aiming algorithm,<br />
optional interactive plotting of fluxes from a single zone or from the entire he-<br />
liostat field, and addition of another heat exchanger <strong>for</strong> use between a receiver<br />
fluid and a different storage fluid. Also, the operating logic was adjusted so that<br />
receiver operation only occurred when net power was positive, and so that the<br />
turbine-generator only operated from storage instead of directly from the receiver.<br />
I.B. Conventions in This <strong>Manual</strong><br />
In this description of <strong>DELSOL3</strong>, variables which are capitalized refer to<br />
namelist input variables. In some instances, different variable names will be used<br />
when describing the theory behind certain algorithms, in which case the variable<br />
names will not be capitalized, but these may be related to input variables by fol-<br />
lowing the theory variable by the capitalized input variable in parenthesis. For<br />
instance, fa (FSP) relates the input variable FSP to the theory variable fa.