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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L<br />
FEP = 0.0<br />
TPRE = 1.0 hour<br />
TSTRT = 1.0 hour<br />
PARLl = 0.5<br />
PARL2 = 0.103<br />
PARL3 = 0.5<br />
PARL4 = 0.103<br />
PARL5 = 0.5<br />
PARLG = 0.008<br />
PARL7 = 0.5<br />
PARL8 = 0.008<br />
PARL9 = 0.18<br />
. PARLlO = 0.009<br />
1II.H. Energy Calculation During a Per<strong>for</strong>mance Run<br />
A system is designed by DELSOL to have a certain power rating at a fixed<br />
point in time. Further, DELSOL calculates the field efficiencies at times through-<br />
out the year as defined by the variables NYEAR and HRDEL. However, the cri-<br />
terion by which DELSOL chooses an optimum system is that of lowest levelized<br />
energy cost, which is a function of equipment costs and of the net annual en-<br />
ergy output of the plant. (Costs will be discussed in Chapter V.) Annual energy<br />
is calculated in two ways in DELSOL, oncd as an approximation <strong>for</strong> use in sys-<br />
tem optimization and once in detail vs. time in a final per<strong>for</strong>mance calculation<br />
(IPROB=O). A sample waterfall chart, without values, is shown in Figure 111-4 to<br />
indicate the bookkeeping which DELSOL does to calculate annual energy.<br />
For either an initial per<strong>for</strong>mance run <strong>for</strong> use in system optimization or a final<br />
per<strong>for</strong>mance run (IPROB=4 or 0) the code calculates the hours of receiver oper-<br />
ation (HROP) and annual insolation based on the values of ASTART, WEATH,<br />
and INSOL. Next, field efficiencies are calculated <strong>for</strong> each time HRDEL over each<br />
day NYEAR. From this point on, annual energy is calculated during system op-<br />
timization by using yearly insolation to calculate annual energy to the receiver<br />
and then using that value to subtract out receiver losses (Equation 1II.G-11) and<br />
piping losses (Equation 1II.G-18). Storage is assumed to be large enough to store<br />
any excess energy during optimization, so that none is discarded. Next, the tur-<br />
bine is assumed always to run at off-design conditions <strong>for</strong> optimization, having<br />
an average annual conversion efficiency of ETAREFxFEFF. This is probably the<br />
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