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

Following the approach in the previous Section for IRADFL=l, let qp,~p be the
piping thermal efficiency at the design point, so that:
(I1I.G - 17
In analogous fashion, the yearly average piping efficiency, ~P,AVG is calculated
assuming that PLOST,~ is constant through the year:
qP,AVG =
ETOT,P - HOP x PLOST,P
ETOT,P
- HOP x abePHTHT(qRC,R,DPPth,R)o’5
-1-
ETOT,P
(1II.G - 18)
where ETOT,~ = total energy delivered to piping per year (=~RC,R,AVGETOT,R),
Hop = total number of hours of receiver (not plant operation).
As with finding C~R in the previous Section, ab is based on a reference design
for which a detailed calculation is available. Rearranging Equation (1II.G-17) and
denoting the reference design values with a superscript O results in:
Current default values are based on a salt design and PTh,R given
above) :
q$ (REFPIP) = 0.990
LOp (REFLP) = 170.0 m
(1II.G - 19)
III. G-5. Thermal/Electric Conversion Eficiency-There are two options for
the design point thermal to electric conversion efficiency, ~TE,REF, identified by
the user’s choice of the parameter ITHEL:
1) ITHEL = 0 ~TE,REF constant at all design point power levels;
value specified by the user
2) ITHEL # 0 ~TE,REF varies with gross design point electrical output based
on reported plant performance and designs (References 30-32)
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