Re: [TRNSYS-users] Keeping a value during a period

[Damien Gondre <damien.gondre@insa-lyon.fr>]

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@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

 

 

10 avenue des canuts

69120 VAULX EN VELIN

T : 04.37.45.33.33 

 

Ligne directe : 04.37.45.33.47

 

www.katene.coop

www.quadriplus-groupe.com

www.woopa.coop

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