Re: [TRNSYS-users] Forcing Functions and Weather Data Files

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

Hi Samuele,

The best solution is to use an equation, in which you use the function GT().
- Add an equation component in your project.
- Double click on the equation component, and add a new input, called 
"Ib".  You will connect the beam radiation from the radiation processor 
to this input.
- Create another input called "cf". You will connect the output from the 
forcing function Type14.
- Now, create a new equation:
cf2 = cf*GT(ib,0)

The function GT(a,b) returns 1 if a>b.  You can find more information 
about the available functions in the manual Volume7-Section7.6.9.
Best regards,

Diego


Samuele wrote:
> Dear all,
>  
> I'm trying to simulate a simple system in which there is a pump and 
> a linear parabolic concentrator but I don't have enough information for:
>  
> - build a forcing function for the pump by which it can work from 6 am 
> to 18 pm and only if beam radiation is higher than a fixed value;
>  
> - update values of direct normal radiation in the weather data file, 
> or create a new weather data file ( with inputs I would insert ) which 
> could be read by Trnsys.
>  
> Could anyone give me any advices?
>  
> Thanks in advance,
>                               Samuele Mazzei.
> ------------------------------------------------------------------------
>
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--
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706