An Introduction To Solar Radiation by Iqbal Muhammad

Author:Iqbal, Muhammad [Iqbal, Muhammad]
Language: eng
Format: epub
ISBN: 978-0-323-15181-8
Publisher: Elsevier Science
Published: 1983-04-13T05:00:00+00:00

Figure 7.6.2 The various irradiances on a horizontal surface.

The multiply reflected irradiance varies almost linearly with ground albedo [Eq. (7.4.16)]. The effect of ground albedo is shown in Fig. 7.6.3. An almost fourfold increase in the multiply reflected irradiance results as ρg is increased from 0.2 to 0.8.

Figure 7.6.3 The effect of ground albedo on the multiply reflected diffuse irradiance.

7.7 Comparison of the Parameterization Models

We now compare some of the individual transmittances and the irradiances obtained from the three models.

The ozone transmittances are compared in Fig. 7.7.1. Although the algebraic expressions for τo in the three models are quite different, the numerical values obtained are within 1% of each other. The greatest difference is between Models B and C. In this particular diagram, l = 0.35 cm(NTP). These differences are a function of the amount of ozone and of the zenith angle. Because ozone transmittance is very high, its effect on the overall transmittance is minimal.

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