Re: radiation processor, type 16h

[Michaël Kummert <kummert@xxxxxxxxxxxxx>]

Dear Moritz,

> my question is about the type 16, mode 4, more exactly input 2 called 
> "direct normal beam radiation". It is explained as "beam radiation on a 
> surface oriented towards the sun". Now, which surface is ment? Is it a 
> hypothetical tracking surface, with its normal always pointing towards 
> the sun?
Yes. Please also note that the "beam radiation" is NOT the total 
radiation ( so even if you had a standard pyranometer on a surface 
oriented towards the sun at all times, you would not measure the beam 
normal radiation)


>  
> I have got 5 surfaces to be defined, which of the first is the collector 
> field, none of them is tracking the sun. We measure the radiation values 
> ourselves with two devices: 1. horizontal, 2. parallel to the collectors 
> (SW, 30° sloped) - can I use 16h with these values?
Unfortunately, there is no direct way to use your measurements on the 
sloped surface with  Type 16.
If you just need the radiation on your collectors, you can use your 
measurements in their plane directly of course. If you need solar 
radiation on other planes, one way would be to use only the horizontal 
radiation with the appropriate mode of Type 16. You can then compare the 
radiation obtained in the solar collector plane with the measured results.
Another option is to use an external program to recompute the normal 
beam radiation or the diffuse horizontal radiation from your 
measurements and then use those as inputs for Type 16.

I hope this helps,
Michaël Kummert

--
_________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@engr.wisc.edu

SEL Web Site: http://sel.me.wisc.edu
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys