The solar irradiation on a photobioreactor plant for cultivating microalgae products such as dyes, vitamin, and biofuel is formulated, calculated, and verified. The outdoor solar plant consists of multiple horizontal tubes arranged in multiple vertical walls. The solar irradiation determines the growth rate of the algae; therefore, calculating the amount of solar radiation on the plant is important to estimate the production of microalgae. The incident direct beam irradiation on the tubes is calculated, taking into account tube and wall shading.

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