Re: [TRNSYS-users] RADIACTION PROCESSOR

["Diego A. Arias" <daarias@wisc.edu>]

Hi Javier,

I would like to add to Dave's answer that usually these mismatchs 
between beam radiation and total radiation occur at sunset or sunrise.  
This is caused by the uncertainty of the instruments under these 
conditions of very little radiation.  The contribution of these values 
is so little to the overall performance of any system that you can 
neglect them.
Best regards,

Diego

David Bradley wrote:

> Javier,
>  The solar constant parameter in Type16 is the amount of solar radiation 
> falling on a 1 m2 surface outside the earth's atmosphere. There are a 
> number of different estimates of this amount dating back to various 
> research projects before the birth of TRNSYS. If you are getting only 6 
> warnings about radiation exceeding extraterrestrial during the course of 
> your simulation, I would not worry too much about it. The math and sun 
> earth geometry can cause such calculation. If you are getting hundreds of 
> those warnings then that is a good indication that there is something 
> incorrect about your input file.
> Kind regards,
>  David
>
> At 05:21 3/28/2006, javier mota wrote:
>  
>
> > HALO.
> > I AM javier mota from 3i-ingenieria, madrid.
> > we have installed a radiaction register in hellin, a city in albacete,spain.
> > i am studying the data with a data reader and a radiation processor.
> > i have data from 26-nov to 21 march and i found i have an error "the beam
> > radiation excedeed the extraterrestrial radion forr 6 time steps."
> > I am running simulation with a time step of 10 minutes, data reader has data
> > at intervals of 10 minutes.
> > I have looked all the parameteres and all lokk ok.
> >
> > but i have a doubt about the solar constant. 4871 kj / h m2 is the default
> > value in tyrnsys.
> > but it is a parmeter value.so i would be able to change this value.
> > but it is called solar connstant, contant mean it is a fixed value.
> > so, for this city in sapin, hellin, neqar albacete, the solar constant may
> > be a parameter that a should change to another value?
> > thanks in advance.
> >
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