Abstract

In this study, the optimal tilt angle with respect to the module azimuth angle was investigated for the case of low latitude equatorial region. A replicable methodology for establishing the appropriate rooftop support structure adjustments required to attain the maximum possible solar irradiance on pitched rooftops was proposed. By using the particle swarm optimization technique, the study results revealed that for the case of Uganda, the annual optimal tilt angle and average monthly optimal angle vary in the range 0.0 – 5.1 and 2.1 – 11.2, respectively, for all the latitudes and module azimuth angles. Generally, due to the combined advantages of high total annual solar irradiance received by a module and the practicality of installation adjustment, the annual optimal tilt angle is the best installation option for pitched rooftops for all azimuth angles. A tilt angle equivalent to the rooftop pitch angle resulted in a significant reduction in the total solar irradiance received by the module in comparison to the annual optimal tilt angle. An adjustment in the support structure in the range of 0.1 – 1.2 m is required to maximize the solar irradiance received by a module on the pitched rooftops in Uganda.

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