[TRNSYS-users] Keeping Calculated Value over Time Period

[Damien Gondre]

Dear Steve,

I know a solution that should work but it is not necessarily the best one:
You could use an equation box with an input variable called *old_value *for
instance, and two output variables called *value *and *new_value* for
instance. At each time step you have to stock the *value* in the *old_value
*variable using the input value recall (type 71).
In the *new_value *variable you calculate the new value at each htime step.

Then you decide upon the hour of the curent day if you want to use the old
value or the new value by using the following equation :
*value = eql(mod(time,24),0)*new_value+(1-eql(mod(time,24),0))*old_value*


It should work,

Regards,

Damien Gondre.
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On Tue, May 22, 2012 at 4:37 PM, <esterl at pk-i.de> wrote:

>
> Dear Trnsys Users,
>
> I have a Problem in a Trnsys Simulation.
> I want to keep a calculated value at a certain time step over 24 hours and
> then calculate a new one.
> For example:  I want to calculate the value at hour 0 of day 1 and then use
> this value in further calculations on this day. At day 2 i want to do the
> same with the new value for hour 0 of that day.
>
> The problem i'm having is, that i don't know how to tell transys to use a
> value over 24 hours an then calculate a new one for the next 24 hours and
> so on.
>
>
> Thanks for your Help !
>
> Steve
>
> _______________________________________________
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> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users
>
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