Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres

Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres

Table 4-1. Direct Normal Spectral Irradiance Comparison of Dave Results with SPCTRAL2 Results for a Rayleigh Atmosphere with Molecular Absorption (O₃ = 0.31 atm-cm, H₂0 = 2.93 cm)

Z = 0° Z = 60° Z = 80°

(痠) Dave SPCTRAL2 Dave SPCTRAL2 Dave SPCTRAL2

0.31 105.4 103.0 16.1 15.8 0.01 0.0

0.36 607.7 607.1 345.8 346.3 41.5 45.6

0.415 1299.0 1298.0 951.0 951.7 294.5 310.2

0.515 1591.0 1590.0 1381.0 1380.0 811.5 832.0

0.615 1469.0 1469.0 1334.0 1334.0 926.7 953.7

0.7035 1292.0 1291.0 1231.0 1230.0 1032.0 1042.0

0.725 1125.0 1119.0 1033.0 1028.0 793.4 803.1

0.9935 743.4 731.8 730.5 714.5 689.8 667.6

2.1 83.4 70.7 80.0 75.2 72.2 63.4

**Table 4-1. Direct Normal Spectral Irradiance Comparison of Dave Results with SPCTRAL2 Results for a Rayleigh Atmosphere with Molecular Absorption** (O₃ = 0.31 atm-cm, H₂0 = 2.93 cm)
Z = 0°	Z = 60°	Z = 80°
(痠)	Dave	SPCTRAL2	Dave	SPCTRAL2	Dave	SPCTRAL2
0.31	105.4	103.0	16.1	15.8	0.01	0.0
0.36	607.7	607.1	345.8	346.3	41.5	45.6
0.415	1299.0	1298.0	951.0	951.7	294.5	310.2
0.515	1591.0	1590.0	1381.0	1380.0	811.5	832.0
0.615	1469.0	1469.0	1334.0	1334.0	926.7	953.7
0.7035	1292.0	1291.0	1231.0	1230.0	1032.0	1042.0
0.725	1125.0	1119.0	1033.0	1028.0	793.4	803.1
0.9935	743.4	731.8	730.5	714.5	689.8	667.6
2.1	83.4	70.7	80.0	75.2	72.2	63.4

Return to RReDC Homepage ( http://www.nrel.gov/rredc )