Hello all
I am modelling solar dish collector in COMSOL. I want to redo my model for various weather conditions i.e., Hot sunny, cloudy, cold sunny days with and without clouds.
Apparently I can vary the Vacuum wavelength or frequency under ray properties. Can anyone please tell me some empirical values for such different weather conditions and also for different parts of day.
Default value of COMSOL is 660 nm and 4.54e14 Hz.
Any help in this regard will be highly appreciated.
Thanks a lot
This is a weird way of describing the Sun spectrum. Solar spectrum don't change much in the visible, unless it is very close to the horizon. Aerosol tend to act like gray filter due to the Mie diffusion, which is only slightly wavelength dependant.
Detailed calculations a rather tricky and I would use either MODTRAN or a dedicated dedicated model to estimate the solar spectrum.
As you are working with a software, you can vary the wavelength in a wide range and determine its impact on your analysis. It might not be necessary to distinguish between the weather conditions.
Dear Dr. Yvan Dutil and Prof. Sharma
Actually I am working with a software where I can only input Vacuum wavelength or frequency as ray property of light .... so thats why I want some correlation with discreet values rather than ranges
Secondly I want to correlate with weather conditions because I am doing Experiments of various days as follows and I want to correlate my experiments with simulations
1. Morning/midday/evening of sunny Day
2. Morning/midday/evening of thickly cloudy Day
3. Morning/midday/evening of thinnely cloudy Day
Is the classification stated a standard? The definition of sunny, cloudy are subject to variations. Possibly you may correlate wavelength to the values of solar radiation, humidity, elevation from mean sea level (altitude), etc. This will be appropriate as your work is related to the design/performance of a solar dish collector.
Above classification is not standard, I just chose these classifications.
I guess your suggestion is very relevant, and I really appreciate that. But the issue still stands that how can I correlate wavelength with humidity, air temperature etc because my software does not give me these quantities as output.
Statistical software packages like SPSS, etc can aid in your obtaining regression equations. You may have to obtain solar radiation etc which is stated earlier. You should be able to relate solar insolation to solar wavelength. Check with some solar radiation measuring instrument manufacturers and obtain their guidance. Using this data, you can non-dimensionalize the various parameters influencing solar radiation.
Thanks a lot Prof Sharma ... I will surely try to get to some solar radiation measurement equipment manufacturers..
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