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

‘?F,k,l
PCRk,l = -
, CH,k,l
where k = radial zone index
1 = azimuthal zone index
VF,~,J = yearly average field efficiency in zone (IC, I )
CH,k,l = cost of putting 1 m2 of reflective surface in zone (k,l)
relative to the same cost for zone (1,l).
In more detail,
‘?F,k,l = ’?COS,k,l x ‘?SHAD,k,/ Xh’?BLO,CK,k,l x ‘?ATM,k,l x ‘?INT,k,l
where ‘?cos= cosine efficiency = 1.0 - cosine loss
‘?SHAD= shadowing efficiency = 1.0 - shadowing loss *
‘?BLOCK= blocking efficiency = 1.0 - blocking loss
VAT-= atmospheric transmittance= 1 .O - atmospheric attenuation
QINT= receiver intercept factor = 1.0 - spillage
The relative mirror cost is comprised of three parts:
CHEL,k,f + CLAND,k,f + CWIRE,k,l
CH,k,l =
CHEL,~,~
+ CLAND,~,~ + CWIR.E,~,~
where CHEL = $ for total heliostat structure,
m2 mirror area
equal for all heliostats in the field
$ 1
* less dense zones
= ,2 ]and mirror density per zone’
have greater associated land costs per heliostat
$ x 1 * the “$/heliostat” varies
(1V.B - 2)
= heliostat glass area/heliostat’
with local density (greater secondary wiring costs with lower
densities) and distance from the tower (greater primary wiring
costs as the field gets larger), as discussed in the wiring
cost model Section (V.A-3).
A PCRk,l is calculated for each zone, and the zones are ranked from best to
worst PCR before optimization starts. To build up a field, the zones are added
one at a time, starting with the most cost effective, i.e., the one with the highest
PCR. As each zone is added, the design point thermal power to the receiver, the
annual energy production from the field, and the total field costs (heliostats, land,
and wiring) are updated. Also, the power dependent receiver and piping radia-
tion and convection losses are recalculated to determine the net electrical power
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