Estimation of diffuse and direct radiation starting from the global radiation

In summary, the conversation is about estimating the direct and diffuse components of global radiation on a south oriented surface. The speaker is looking for methods to do so and mentions an article that discusses this topic. However, the article is not applicable to their situation as it uses data from a horizontal surface. The other speaker suggests looking into models and applications of BRDFs, heat transfer, and remote sensing for more information.
  • #1
FrancescoP
2
0
I don’t know if this one is the appropriate forum for the following question. If for this question it is better another section of the forum, point out to me, please.
I know the global radiation on a south oriented surface, in a German locality. Do you know methods to estimate the direct component and the diffuse component? I found an article very interesting

C.J.T. Spitters, H.A.J.M. Toussaint e J. Goudriaan, “Separating the diffuse and direct component of global radiation and its implications for modeling canopy photosynthesis Part I. Components of incoming radiation”, Agricultural and Forest Meteorology, Amsterdam, Elsevier Science Ltd., Volume 38, Issues 1-3, ottobre 1986, pp. 217-229

but unfortunately it isn’t useful in my case because as input data it presents the radiation on a horizontal surface, not on a south oriented surface.

With Regards
Francesco
 
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  • #2
Are referring to the direct component from the sun, and the diffuse component from everywhere else?

I was only able to pull up the abstract, but based on that, it agrees with my suspicion- given a single measurement of the total (hemispherical) incidance, you cannot uniquely separate the direct and diffuse component. Those guys have a model; there are many models. Mostly people try and model BRDFs, but the concept is closely related to your problem.

http://www.pa.op.dlr.de/ISIS/
http://www.ecd.bnl.gov/pubs/BNL67010.pdf
http://modis.gsfc.nasa.gov/about/design.php
http://www-modis.bu.edu/brdf/userguide/intro.html

Other applications are heat transfer and remote sensing, you may find some good information that way.
 
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FAQ: Estimation of diffuse and direct radiation starting from the global radiation

1. What is the difference between diffuse and direct radiation?

Diffuse radiation refers to sunlight that has been scattered in the Earth's atmosphere, while direct radiation refers to sunlight that reaches the Earth's surface without being scattered.

2. Why is it important to estimate diffuse and direct radiation?

Estimating diffuse and direct radiation is important for understanding the amount of solar energy that is available at a particular location. This information is useful for designing solar energy systems and predicting weather patterns.

3. How is diffuse and direct radiation estimated?

Diffuse and direct radiation are estimated using mathematical models that take into account factors such as the angle of the sun, cloud cover, and atmospheric conditions.

4. What are the main challenges in accurately estimating diffuse and direct radiation?

The main challenges in accurately estimating diffuse and direct radiation include variations in weather patterns, changes in atmospheric conditions, and the complex interactions between sunlight and the Earth's surface.

5. How can the estimation of diffuse and direct radiation be improved?

The estimation of diffuse and direct radiation can be improved through advancements in technology, such as more advanced weather forecasting models and satellite imagery, as well as ongoing research in the field of solar energy and atmospheric science.

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