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

SamDle Problem 2a - Optimization of a Multi-Aperture Cavitv DeDth
Problem Statement
A 4-aperture receiver, including storage size, is to be optimized for a 125
MWe molten salt system with a solar multiple of 1.5. The receiver is a cavity de-
sign configured so that the north aperture is the largest, the south the smallest,
and the east and west of intermediate size. The depth of each cavity varies in a
similar fashion. A flux limit of 0.6 MW/m2 is specified. A flux map of the opti-
mum north cavity surface is required for subsequent detailed design studies. The
optimized field layout should be printed and the optimization data saved.
A reminder: As discussed in Section IV.C-3(c), optimum cavity receiver design
should be carried out in two steps. First, the optimum depth of each cavity
should be calculated, and in a second run (Sample Problem 2b) the optimum
aperture size. These sequential runs are discussed as Problems 2a and 2b.
Input Cards
SAMPLE PROBLEM 2A
$f3ASIC ITAPE=2 $
$RCC IREC=2, W=20 . IAUTOP-2. NUMCAV=4.
RWCAV-1.0.0.75.0.5.0.75 $
$OPT NUMTHT=4, THTST=160 , THTENO=220.. NUMREC=5. WST=14 . WEND=22 ,
IOPTUM-2. NUMHTW=7. Hl\JST=30., HTWEND-45.0. RVTRX=I 0. RX2TRX=O 8.
RX3lRX=0.6. RX4TRX=O 8. NUMOPT=I. POPTMN=125.€+06.
IPLFL=I $
POPTMX=125.E+06.
JNLFLUX IFLX=1. NXFLXz5, FAZMIN=135 , FAZMAXz225.. NYFLX=4, FZMINX-1 68.
FZMAX=4.92, NFLXMX=4. NMXFLX=3.8.13.18, FLXLIM=4*0.6E+06 $
ShrLEFF 8
$NL(:OST CHEC1=4.735e+06, ARECRF=1749.0 $
BNLLCON $
$REC W=-lOO. $
Analvsis of Input
The problem statement is somewhat general, so some choices must be made
by the user. First, because this is a surround cavity receiver of approximately the
same power level as in Sample Problem la, that surround field performance file
(Unit 10) can be used, making a new initial performance calculation unnecessary.
For this option, the variable ITAPE=2 is defined. No other namelist cards will be
read in the performance group. The $REC$ card is the first of the optimization
group and defines a cavity with four rectangular apertures (IREC, NUMCAV)
and automatic 2-d aiming for cavity apertures (IAUTOP=2). Relative cavity
depths are specified by RWCAV. (Values used here are reasonable ones, but could
be varied according to the user’s previous experience or to examine sensitivity of
the design to these choices.) The value of W is chosen strictly to allow convenient
specification of flux point locations, since the cavity depth is to be optimized in
this run.
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