[TRNSYS-users] Keeping a value during a period

[Damien Gondre]

Dear Pauline,

You have to use a type 93 (input value recall) in the utility library.
It allows you to store a variable for a given number of timestep.

What you have to do is to store the value of T17h during 1 timestep and
modify your equation as follow:
T17h=eql(mod(time,24),17)*temperature_zone10 *+
(1-eql(mod(time,24),17))*old_T17h*
*
*
In your equation box, *old_T17h* would be an additional input linked to the
output of type 93.
The output *T17h* of your equation box is then to be linked to the input of
type 93.

You'll get variable that will be updated every 24h at 5pm.


Regards,


_________________________****

Damien GONDRE

PhD Student

Centre de Thermique de Lyon (CETHIL)
Bâtiment Sadi Carnot
9 Rue de la Physique
INSA de LYON
69621 Villeurbanne Cedex

Tél : 04 72 43 84 68



On Wed, Apr 24, 2013 at 3:26 PM, Pauline GELIN <p.gelin at katene.fr> wrote:

> Hello, ****
>
> ** **
>
> I would like to modelize a manual night ventilation. For that I need to
> keep the value of temperature for the time X (for example 17 pm) and
> compare this value with a set temperature during a given period (for
> example a night). ****
>
> ** **
>
> I don’t know to keep a value in a variable during a given period. Could
> anyone help me? ****
>
> ** **
>
> I began with the following formulas but  when the condition of the first
>  variable is not checked it returns 0 and the third variable doesn’t return
>  what I want :****
>
> ** **
>
> T17h = eql(mod(TIME,24),17)*temperature_zone10****
>
> periode = or(lt(mod(TIME,24),9),gt(mod(TIME,24),17))****
>
> vnat = gt(T17h,24)*periode*2****
>
> ** **
>
> ** **
>
> Thanks a lot for your help. ****
>
> ** **
>
> Best Regards,****
>
> ** **
>
> *Pauline GELIN*
>
> *Ingénieur Conception environnementale*
>
> ** **
>
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