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

for calculation are the values specified in the last REC Namelist, and any range of
variables specified in the OPT Namelist are ignored.
IV. C-1. Design Point Power Level-DELSOL can simultaneously optimize sys-
tems at NUMOPT (520) equally spaced discrete design point power levels from
a minimum value of POPTMN to a maximum value of POPTMX (watts). The
design point occurs at REFTIM hours past noon on the REFDAY day of the year
(Namelist BASIC). The insolation at the design point is assumed to be REFSOL
kw/m2 during optimization, despite the fact that during a performance calcu-
lation the calculated insolation from the chosen insolation model might have a
different value. Thus, at the design point conditions the design point power level
will be reached (as designed), but for different conditions the actual power level
might vary. The requested power levels are reached by building up the heliostat
field until that power is reached for a specific tower and receiver geometry.
IV. C-2. Tower Height-DELSOL can search over NUMTHT (520) equally
spaced discrete values of the tower height from a minimum value of THTST me-
ters to a maximum value of THTEND meters. The tower height to be specified is
the optical tower height, or the elevation of the midpoint of the receiver above the
plane of the heliostat pivot (see Figure 11-13). The optical tower height is used in
all DELSOL calculations except the tower capital cost calculation, which uses the
height from the ground to the bottom of a transition region between the tower
and the receiver. All references in job inputs and outputs to tower height refer to
the optical tower height. If NUMTHT=l, the tower height will be fixed during
optimization at the last defined value of THT (Namelist REC).
IV. C-3. Receiver Dimensions-DELSOL can search independently over two
separate receiver dimension variables. Although the same names for the variables
are used for all different receiver types, the meaning and definition of the vari-
ables depends on the type of receiver as specified by the value of IREC (Namelist
REC) :
106
a) External Receiver Dimensions-The first receiver variable for an external
receiver is the diameter W of the receiver. There are NUMREC (520)
equally spaced discrete values of W from a minimum of WST meters to a
maximum of WEND meters. The second variable which can be optimized
is the ratio of the receiver height H to the receiver width W. There are
NUMHT W (520) equally spaced discrete values of H/ W from a minimum
of HTWST to a maximum of HTWEND. If NUMREC or NUMHTW is
set to 1, the value of the receiver variable will be fixed to be the last de-
fined value of the appropriate variable (W or H) in Namelist REC.
b) Flat Plate Receiver Dimensions-The first receiver variable for a flat plate
receiver is the horizontal dimension of the first flat plate, RX(1). There
are NUMREC (520) equally spaced discrete values of RX(1) from a min-
imum of WST meters to a maximum of WEND meters which are exam-
ined during optimization. The second receiver variable is the ratio of the
first plate’s vertical dimension to its horizontal dimension, RY( 1)/RX( 1).