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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grid of points on the DELSOL assumed heat absorbing surface (IFLAUT=4).<br />
The grid of flux points <strong>for</strong> the first three options does not have to lie on the DEL-<br />
SOL assumed heat absorbing surface unless desired, and also does not have to<br />
correspond to the assumed height of the heat absorbing surface. Thus, the effect<br />
of different internal cavity configurations on flux distribution can be examined by<br />
specifying different flux surfaces, the noncooled surfaces of the interior of a cavity<br />
can be checked <strong>for</strong> internal spillage, or the flux distribution of small sections of a<br />
receiver can be examined in greater detail.<br />
If IFLAUT=l, the points are generated on the outside of a cylinder with a di-<br />
ameter of DIAMF (meters). The center of the vertical cylinder is XFC meters<br />
to the east, YFC meters to the north, and ZFC meters up with respect to the<br />
receiver center. There are NXFLX flux points around the circumference from a<br />
minimum surface normal azimuth of FAZMIN degrees to a maximum of FAZ-<br />
MAX degrees (see Figure 11-16). The north side of the cylinder has an azimuth<br />
angle of BO0, the east is at 270°, and so on. There are NYFLX flux points on the<br />
height of the flux surface from a minimum of FZMIN meters to a maximum of<br />
FZMAX meters, relative to ZFC. This option is most useful <strong>for</strong> studying cylindri-<br />
cal external receivers or <strong>for</strong> examining the flux distributions of individual tubes in<br />
a receiver.<br />
If IFLAUT=2, the flux points are on the inside of a hollow vertical cylinder.<br />
All of the variables have the same meaning as above, except that since the sur-<br />
face normals are on the inside of the cylinder the azimuth on the north side is 0’<br />
(not 180°), and the east side azimuth is 90’ (not 270°), etc., as shown in Figure<br />
11-16. This option is useful <strong>for</strong> generating flux maps <strong>for</strong> the interiors of cavity re-<br />
ceivers. However, it must be remembered that the center of curvature of a cavity<br />
heat absorbing area, as defined by DELSOL, is at the aperture, so that the cylin-<br />
der defining the flux surface should be centered using the appropriate values of<br />
XFC, YFC, and ZFC. Then, the diameter (DIAMF) of the cylinder defining the<br />
flux surface should be based on the actual depth of the cavity, which may be dif-<br />
ferent from half of the width W of the cavity structure, depending on the choice<br />
of the parameter RWCAV(1).<br />
If IFLAUT=3, the flux points are located on a plane. The outward surface<br />
normal f on the side of the plane on which the flux is incident makes a polar angle<br />
of POLF degrees with the vertical and an azimuthal angle of AZMF degrees<br />
with respect to the south direction (these angles are defined in an analogous manner<br />
to the angles of the fi, 3, E, and F vectors in Figure 11-2). A Cartesian coordinate<br />
system (if, jf, I,) is constructed with = f, where 2?f is in the plane and<br />
horizontal and jf is in the plane and pointing up when 6, is horizontal (Figure II-<br />
17). The origin of this coordinate system is XFC meters to the east, YFC meters<br />
to the north, and ZFC meters up with respect to the “center of the receiver” as<br />
described above. There are NXFLX equally spaced values of the flux points along<br />
the 2, axis from a minimum of FAZMIN meters to a maximum of FAZMAX meters.<br />
Similarly, there are NYFLX equally spaced values of the flux points along<br />
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