pvl_iam_martinruiz

Determine the incidence angle modifier using the Martin and Ruiz model.

Contents

Syntax

Description:

pvl_iam_martinruiz calculates the incidence angle modifier (IAM) as described in [1] and clarified in [2]. The incidence angle modifier quantifies the fraction of direct irradiance incidence on a module's surface that is not reflected away. The incidence angle modifier is computed as

$$IAM = {\frac{1 - \exp(-\cos(\theta /a_r))} {1 - \exp(-1/a_r)}} $$,

Thus $IAM = 1$ at $\theta = 0$, and $IAM = 0$ at $\theta = 90$.

Inputs

Output

Example

This example plots the IAM for glass over a range of incident angles.

ar = 0.15;       % empirical losses coefficient of 0.15
theta = 0:90;    %incident angle in degrees
IAM = pvl_iam_martinruiz(ar, theta);
figure
plot(theta,IAM)
xlabel('Incident Angle (deg)')
ylabel('IAM')
title('Martin and Ruiz IAM Model Example')

References

[1] N. Martin and J. M. Ruiz, 2001. Calculation of the PV modules angular losses under field conditions by means of an analytical model, Solar Energy Materials & Solar Cells, vol. 70, pp. 25-38.

[2] N. Martin and J. M. Ruiz, 2013. Corrigendum to 'Calculation of the PV modules angular losses under field conditions by means of an analytical model', Solar Energy Materials & Solar Cells, vol. 110, pp. 154.

See also

pvl_getaoi , pvl_ephemeris , pvl_spa , pvl_iam_ashrae , pvl_iam_physical

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