Solar Radiation Calculation With the results developed in the previous section, the beam irradiance in W or W/m2 -day on the catenary-tent-collector can be determined. The diffuse and albedo components will be added to the beam to get the global irradiance and insolation. A north-south facing catenary tent collector will be considered. A generalization to any arbitrary oriented tent may be obtained using eq. (4). Beam Irradiance The beam irradiance on both sides of the tent depends on the self-shading condition of eq. (3). In calculating the irradiance on an unshaded side we resort to Fig. 8. The beam irradiance P, in watts (W), on an unshaded side is given by:
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