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



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