Solar Irradiance Using Hottel's Clear-Sky Model

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This Demonstration implements Hottel's clear-sky model to estimate the solar irradiance in at locations around the world. Integrating the curve over time yields the total solar energy received by a flat board in W h. This consists of two components: direct radiation and atmosphere-diffused radiation . Such a model can be used in various solar-related projects. It is computationally efficient and reasonably accurate during the summer in the middle latitudes. Altitude must also be taken into consideration in the design of a solar-powered vehicle.


The graphic shows the length of the day in hours and the total energy incident on a flat board in a day, in W h. The latitude is positive for north latitude, negative for south latitude.


Contributed by: Zhaohua (Edward) Zeng (January 2023)
Open content licensed under CC BY-NC-SA



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