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from that specified during the optimization. This does not affect anything other than the flux calculation. That is, the system performance of the optimized system will be unchanged. However, the values specified during optimization did not completely cover the cavity wall, and this change “fixes” that oversight. Comments on Output The output is similar to that of Sample Problem 2b, although the chosen system and cavity description is different. The fluxes at the 90 degree edge of the cavity are no longer insignificant, as they were for the multiple-aperture cavity. However, fluxes at the top of the wall are still large. Sample Problem 3b will generate a flux map of the roof of this cavity design. 216
Sample Problem 3b - Generating a Flux MaD for a Cavity Roof Problem Statement For the system of Problem 3a, determine the incident flux on the roof of the cavity receiver. Input Cards SAMPLE PROBLEM 3b $BASIC IPROB=O. ITAPE=3. TDESP=125.0 $ $FIELD $ BHSTAT $ OREC B BNLFLUX IFLX=1, IFXOUT(B.I)-I. IFI.AUT=3. XFC-0.0. YFC=O.O. ZFC=16.10, POLF=180.0. AZMF=180.0. NXFLX=5. NYFLX=5. FAZMIN=-22.5. FAZMAX=+22.5. FZMIN=O.O. FZMAX=22.5 $ BNLEFF B BREC W=-100. $ Analysis of Input This is a performance rerun of a previously optimized system, as indicated by the specified values in Namelist $BASIC$. The system description is read from the file on Unit 30. The flux points are specified to be on a plane (IFLAUT=3) whose center is at the location XFC, YFC, ZFC. The values of FAZMIN, FAZ- MAX, FZMIN, and FZMAX are measured from that location. The plane is downward facing (POLF=180.0). Because the center of the flux plane is also the center of the tower, and because the cavity design (RWCAV and W) specify this design’s back wall to be at the center of the tower, FZMIN is set to zero, and FZ- MAX is set to the depth of the cavity (W/2). This means that the point (0,O) on the plane is the same point as the top point on the centerline of the cavity wall used in Sample Problem 3a. Comments on OutDut All of the output except for flux points and the flux map will be exactly the same as for the final performance run of Problem 3a. The smart user might have specified IPROB=2 on Namelist $BASIC$ as a means of saving computer time, since the purpose of this run wils only to generate a flux map. The flux map is generated by DELSOL assuming that the flux surface is the only surface within the aperture. Thus, for points on the flux surface which are outside the semi-circular area of the cavity, the flux levels would in real life be nonsense, since the flux would strike the wall of the cavity instead. At the flux point common with Problem 3a, the flux is calculated to be 56% of that calculated in 3a. The difference is caused by the difference in the incident angle of flux on the two different flux surfaces. The cavity wall is more nearly normal to the flux, and so has a higher normal flux level than the roof, which is closer to being parallel to the incident radiation. 217
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- SANDIA REPORT SAND86-8018 Unlimit
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SAND 86-8018 Unlimited Release Prin
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' The computer code which this repo
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I. Introduction CONTENTS A. Differe
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1. More Accurate Images from Canted
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VII. Comparison of DELSOL, MIRVAL,
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111-1 Insolation Models 111-2 Atmos
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A USER’S MANUAL FOR DELSOLS: A CO
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owing, blocking, atmospheric attenu
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The fourth major enhancement in DEL
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W- 26 S ? Jr RECEIVER NORMAL COORDI
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ZONE FlEL 180" Figure 11-3. Surroun
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30 ZONE 60 Figure 11-4. Method of Z
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Figure 11-5. North-only Field (INOR
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34 N' Figure 11-6. Code Defined Fie
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36 Figure 11-7. Schematic Diagram o
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-SLEW (1)- Figure 11-8. Example of
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Figure 11-9. Radial Stagger Arrange
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Note that when IDENS=l or 2 the azi
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J1.D. Heliostats Either rectangular
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Given that heliostats will be mass
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(A) FLAT REFLECTED RAY FROM (B) FOC
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IROUND = 0 WM = 9.91 (m) HM = 9.93
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That is, the aperture is always loc
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controlled by the IAUTOP parameter
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only be used with rectangular cavit
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grid of points on the DELSOL assume
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W E Figure 11-17. Flux Points on a
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flux point grid defined during syst
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To see whether this problem is occu
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Cal cul ati onal Day 1 2 3 4 5 Tabl
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1II.B-I. Position 01 the Sun-The su
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where SO is given by Equation (1II.
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c 0 w V c LL .r a 0 0 0 0 0 s /s 0
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1II.C. Field Performance Calculatio
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1II.F. Flux Density and SDillane Th
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III. G-1. Atmospheric Attenuation:
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eceiver) or with aperture area (cav
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In other words, PLOST,R is the same
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Following the approach in the previ
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86 - - - LLLLLL www CLee o m 4 I i
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This approximate method of calculat
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RECEIVER STARTUP WEATHER SUN PARASI
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111.1. Relationship Between Perform
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IV. System Optimization Calculation
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power and annual energy. Section 11
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, . IV.A-7. Calculation of Annual E
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. production. When each design powe
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large enough fraction of total capi
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_____ Table IV-2. Design Parameters
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DELSOL will examine NUMHTW (520) eq
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The final step of cavity receiver o
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. furthermore, that the assumed tur
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point in the NMXFLX(1) array (I=l,
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, flux level. DELSOL determines the
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optimum for any power level is 13.
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I V. System Costs and Economics Whi
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for meteorological equipment. The d
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0 co I I I 0 co J 0 c\! c, 0 3 Ln 0
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w/2 x RWCAV W/2 x RWCAV IN (180. -
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S M ~ , = ~ solar F multiple for re
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nSTOR is determined from an assumed
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CTK,REF (CSTREF) = $9.70 x loG VTK,
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XHE,A = scaling exponent. ni is cal
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. CCFIXED = 2.OE6 +'0.14 x DCC + 0.
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(V.B - 6) The discount rate rDIS is
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VI. Program Flow DELSOL can be used
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.I c to reach a certain design powe
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an optimum storage size based on en
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I Read i n N + K t x ] ITAPE=O or 1
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Read in System Definition from File
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. TABLE VI-2 OUTPIJT FROM OPTIMIZAT
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) Power level specific for detailed
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V1.B. DescriDtion of Subroutines in
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C cy c: C C
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L C c C c C c: C c C C c C C C c: c
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C C C C C C C C C C C C C C C C C C
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At the time of the comparisons MIRV
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164 n m W * ? 0 F F 0 ( z W /M W) X
Page 166 and 167: 166 Phase 1; CDRL Item 2, Pilot Pla
Page 168 and 169: 168 43. Vittitoe, C. N. et al., “
Page 170 and 171: since the values have been already
Page 172 and 173: Title Card $BASIC$ $FIELD$ $HSTAT$
Page 174 and 175: IPROB NYEAR HRDEL UDAY UTIME NUAZ N
Page 176 and 177: TDESP PLAT ALT INSOL SOLCON IWEATH
Page 178 and 179: REFTIM REFSOL ASTART IATM ATMl ATM2
Page 180 and 181: IHPR NLAND XTOWER YTOWER (I= 1 ,NLA
Page 182 and 183: 182 1 1-40 2 1-10 11-20 3 1-10 11-2
Page 184 and 185: SIGTX SIGTY ICANT NCANTX NCANTY HCA
Page 186 and 187: THT TOWL TOWD IREC W H RRECL IAUTOP
Page 188 and 189: For cavities or flat plates, the fo
Page 190 and 191: NXFLX FAZMIN FAZMAX 190 AZMF (North
Page 192 and 193: NMXFLXY) identifies the exact point
Page 194 and 195: REFPRL FSP FEP EFFSTR PF SMULT IP H
Page 196 and 197: IHOPT NUMTHT THTST THTEND NUMREC WS
Page 198 and 199: SMULT IPLFL(1) (I=l ,NUMOPT) IPROPT
Page 200 and 201: CH CL CWR CWDR CWDA ITHT CTOWl CTOW
Page 202 and 203: ICHE CHEREF PHEREF XHEP APHREF PPHR
Page 204 and 205: CKNREF PKNREF XKN 204 Sodium-to-sal
Page 206 and 207: TC TR FDEBT RDEBT ROE IDEP NDEP NYO
Page 208 and 209: The next set of cards is read at th
Page 210 and 211: value of insolation from the specif
Page 212 and 213: For optimizing cavity depth, the IO
Page 214 and 215: For the final detailed performance
Page 218 and 219: Sample Problem 4 - User Defined Fie
Page 221 and 222: GLOSSARY Absorber: The portion of t
Page 223 and 224: Heat Exchanger: A component in whic
Page 225 and 226: Receiver System Efficiency: The rat
Page 227 and 228: Variable AEVMAX AEVREF AFDC ALP(I)
Page 229 and 230: Variable H H20 HCANT HM HPANL HRDEL
Page 231 and 232: Variable PARL7,PARLI) PARL9,PARLlO
Page 233 and 234: Variable W WEATH WEND WM WPANL WST
Page 235 and 236: Analysis Review and Critique 6503 8
Page 237 and 238: Martin Marietta Aerospace P.O. Box
Page 239: Stone and Webster Engineering Corpo
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