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Re: [TRNSYS-users] time considered in trnsys

TRNSYS uses standard time - in other words it does not shift time due to daylight savings during the year.  It does not use solar time.  The time shown in TRNSYS during a simulation or in the results file represents the time at the end of the current timestep.  For example, if you are using a one hour timestep and TRNSYS says the time is 8, then that represents the hour from 7 am to 8 am.  However when you specify forcing functions and other schedules you use the real schedule.  For a forcing function (Type 14), giving the example you provided, the parameters would be:

<In my schedules if I give a coefficient of 0.5 from 7 to 8 and 0.6 from 8 to 9 (standard time)How does trnsys read it ? Should I write 0.5 at 6 or at 7, 0.6 at 7 or at 8 (solar time) ?>
0,0
7,0
7,0.5
8,0.5
8,0.6
9,0.6
9,0
24,0
This would give you a value of 0.5 from 7 am to 8 am, a value of 0.6 from 8 am to 9 am and 0 at all other times.  Remember to close out the forcing function with the last point being used to reset the cycle (a 24 hour repeating function needs to have the last point listed at hour 24).  You need to list every point in the function as if you were drawing the function on a piece of paper.  The plug-in for Type 14 shows you the pattern you have entered if you'd like to check your function.  Refer to the documentation for Type 14 for more examples.
Jeff

 

 

---

Jeff Thornton

President - TESS LLC

22 N. Carroll Street, Madison WI USA 53703

Office: (608) 274-2577  Fax: (608) 278-1475

www.tess-inc.com

E-Mail: thornton@tess-inc.com

 

On 07/19/2012 4:06 am, faustine escoffier wrote:

Hello all,
 
I have a quesiton about the time considered by trnsys coz I'm getting lost.
I guess Trnsys considers the solar time and not the standard hour, for example in France it would consider 7 when it is 8 on my watch (+1h in winter and +2h in summer). Is that right?
 
In my schedules if I give a coefficient of 0.5 from 7 to 8 and 0.6 from 8 to 9 (standard time)
How does trnsys read it ? Should I write 0.5 at 6 or at 7, 0.6 at 7 or at 8 (solar time) ? Does it read the first hour or the last hour?
 
Do I make myself clear? Not sure...
 
Hope I will get some help though
 
Thanks in advance

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ESCOFFIER Faustine