[1] The daily total of radiation balance is computed for all 24-h intervals avail­able. If at least one hourly total value is missing, the daily total is not calcu­lated. For a missing data symbol, “-” is entered in the table instead. [2] In computing daily totals, sunrise and sunset hour intervals are specially treated to […]

TABLE F.1 Efficacy and Zenith Luminance Coefficients for Each Sky Condition Bin Global Luminous Efficacy Direct Luminous Efficacy E bin a1 b1 c1 d1 a1 b1 c1 d1 1 96.63 -0.47 11.50 -9.16 37.20 -4.55 -2.98 117.12 2 107.45 0.79 1.79 -1.19 98.99 -3.46 -1.21 12.38 3 98.73 0.70 4.40 -6.95 109.83 -4.90 -1.71 -8.81 […]

Lambda Lambda (nm) Vlambda (nm) Vlambda 375.0 0.0000 394.5 0.0015 375.5 0.0000 395.0 0.0015 376.0 0.0000 395.5 0.0017 376.5 0.0000 396.0 0.0018 377.0 0.0000 396.5 0.0018 377.5 0.0000 397.0 0.0019 378.0 0.0000 397.5 0.0020 378.5 0.0000 398.0 0.0022 379.0 0.0000 398.5 0.0024 379.5 0.0001 399.0 0.0025 380.0 0.0002 399.5 0.0027 80.5 0.0002 400.0 0.0028 381.0 […]

(+ is “continuation code” an for expression requiring multiple lines; “C” represents a comment line.) ..TAPE1 = INPUT PARAMETERS ..TAPE2 = EXTRATERRESTRIAL SPECTRAL IRRADIANCE, ABSORPTION COEFFICIENTS. ..TAPE3 = OUTPUT FILE..TAPE5 = TERMINAL SCREEN ..THIS CODE WAS WRITTEN BY RICHARD BIRD AND CALCULATES SPECTRAL IRRADIANCE OR PHOTON FLUX ON A TILTED OR HORIZONTAL SURFACE. MODIFICATIONS TO […]

TABLE C.1 CIE D65 Reference Spectrum Relative Amplitude, S0, S-|, S2 Functions for Use in Equations 7.2-7.4 D65 Reference D50 Example Wavelength (nm) Spectrum S(X) (Relative Units) S0QO MM S2M Calculation (Relative Units) 300 0.03 0.04 0.02 0.00 0.02 305 1.66 3.02 2.26 1.00 1.04 310 3.29 6.00 4.50 2.00 2.05 315 11.77 17.80 13.45 […]

Tables B.1 and B.2 show the structure and functions for implementing the DISC (direct insolation simulation code) model in Excel®. Note the cell references rely on the exact structure of rows and columns shown. User values are entered in shaded cells. TABLE B.1 User Location Input Parameters Row Column A Label/Vali 1 2 3 4 […]

Excel® Column A holds user inputs for Bird clear sky model in rows 6 to 29. Note the cell references rely on the exact structure of rows and columns shown. User values are entered in shaded cells. Bold text are labels for values to be entered in cell below label. TABLE A.1 Bird Clear Sky […]

The primary issue for the user of any model is whether it is appropriate for the application or problem under investigation. Does the user have some measured data to evaluate and compare with a model result? Does the user need to evalu­ate one or more particular collector configurations or designs (Concentrator or flat-plate collector? Optimized […]