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

CCREC = CREC,REF ( A ~ L F ) XRBC
where CREC,REF = cost of a reference design (dollars)
AREC,REF = heat transfer area of the reference design
AREC = heat transfer area of the receiver being evaluated
XREC = scaling exponent for receivers, 51.0
Default values are based on the scaling exponent commonly used for heat ex-
changers and on a cavity salt receiver design (Reference 8):
CREC,REF (CRECl) = $23.0 x loG
AREC,REF (ARECRF) = 758.0 m2
XREC (XREC) = 0.8
(V.A - 7)
a) External and Flat Plate Receivers-The area AREC is simply the product
of ?F times the diameter (W) times the height (H) for an external receiver.
For a flat plate receiver the area is RXx RY.
b) Cavitv Receivers-The bottom of the heat absorbing surface is calculated
by DELSOL (for costing purposes) so that at the given cavity depth, W/2
x RWCAV, a ray entering the bottom of the aperture from the farthest
heliostat will strike the heat absorbing surface.
HBOT =(THT - RY/2 x sin(l80 - RELV))
RMAX - W/2 + W/2 x RWCAV
(RMAX - W/2 + RY/2 x cos(l80 - RELV)
(V.A - 8)
where RMIN and RMAX are the local minimum and maximum radii for
the optimized heliostat field.
The height of the heat absorbing surface is specified in one of three ways.
If the default value of the variable H is used, the heat absorbing surface
height will be specified as l.lxRY (1.1 times the aperture height). If a
different value H is specified, then that value is taken to be the actual
height of the heat absorbing surface. However, the height will never be
allowed to be larger than that height needed to intercept a ray from the
nearest heliostat entering the top of the aperture, as shown in Figure V-2a
and described as
HTOP =(THT + RY/2 x sin(l80 - RELV))
RMIN - W/2 + W/2 x RWCAV
(RMIN - W/2 + RY/2 x cos(l80 - RELV)
124
(V.A - 9)
c