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

In this case, the height of the heat absorbing surface is
HCAV = HTOP - HBOT
The circumferential width of the heat absorbing surface used in costing
a cavity receiver is that portion of the cylindrical surface which can be
seen through the aperture by the section of the field active for the cav-
ity. Rays from the nearest heliostats on the boundaries of this sector are
used to calculate the fraction of the surface seen (Figure V-2b). Note that
if Equation (V-A-9) is used to determine the height of the heat absorb-
ing surface, this height may be extremely sensitive to the choice of the
variable RADMIN. In this case the user may find it desirable to rerun the
code with values of RADMIN larger than the default in order to obtain a
reasonable value for HCAV.
V.A-6. Pumps-The pump cost is assumed to be
where CRP = receiver/tower pump cost
Csp = storage pump cost
'
(V.A - 10)
These costs are assumed to scale from the costs €or a knawn reference design.
The scaling parameter for pump costs is the product of the head times the capac-
ity (Reference 37). For the receiver pump, the head is proportional to the tower
height, and the flow rate is the total fluid flow, i.e., EPGS and storage require-
ment. Thus, the fluid flow is proportional to the solar multiple times the thermal
power transferred in the heat exchangers. For the storage pump, the head is as-
sumed to change negligibly from the reference design, and the flow rate is propor-
tional to the thermal power alone (EPGS only). These assumptions lead to the
following equations for the pumping costs:
THT x SM X Pth
CRP =CRP,REF (THTRP,REF x SMRP,REF x Pth,RP,REF
CSP =CSP,REF
where CR.~,REF =
THT =
SM =
126
Pth =
THTRP,REF =
p th,SP,REF
cost of reference receiver/tower pump ($)
tower height (m)
solar multiple
thermal power to EPGS (watts)
tower height for reference receiver pump design (m)
>""' (V.A - 11)
(V.A - 12)