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

To: "TRNSYS users mailing list at the Solar Energy Lab, UW-Madison" <trnsys-users@cae.wisc.edu>

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

From: David BRADLEY <d.bradley@tess-inc.com>

Date: Wed, 24 Apr 2013 09:46:38 -0500

Cc: Vincent MORELLE <v.morelle@katene.fr>

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Pauline,
There are a few Types that might help you. The first is a moving average component (either Type84 or Type939) which calculates the average value of an input over a certain period of time (for instance over the last 4 hours). The second is the "input value delay" (Type93 or Type661 in the TESS Libs). These components hold on to an input value for a desired number of timesteps before "releasing" it as an output. There are also some controllers in the TESS Libraries that have "lock-outs" (the controller must stay on or off for a certain time after changing state) and another that will calculate run-time (the time that has elapsed since its input changed state.)
Best,
David

On 4/24/2013 08:26, Pauline GELIN 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

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