[TRNSYS-users] How to use Type 84 properly

[Leo Häberlein]

Hey Jeff,

Thanks for the quick answer!!
Which run-time calculator do you mean? The Type 1233 run-time controller
from the TESS Library?
I am a beginner with TRNSYS and due to the fact that I am writing my
bachelor-thesis, I cant afford buying the TESS library in addition.
Isn't there another way to solve that problem?
Sorry for bothering you!

Greets

Leo


2011/4/27 Jeff Thornton <thornton at tess-inc.com>

> <Hi everyone,I am trying to connect a chilled ceiling to a moving average
> from the last 3 days.If the average ambient temperature is lower than 16
> degrees for 3 days in a row, the input temperature for the chilled ceiling
> should go up to 24 degrees.  I am using Type 84 for that, but I am not
> sure about my input value(how to connect my moving average to my ambient
> temp) and how my equation for this should look like.I had the idea of a
> 'greater than/lower than' equation but I can only turn it on and off with
> this one.  Can anybody help??>
>
> Leo,
>
> I'm not sure a moving average is going to help you in this case as the
> average doesn't capture the effect you're looking for.  For example,
> imagine you has two really cold days followed by a warm day.  In the logic
> you described above, the chilled ceiling would go up to 24 degrees when it
> shouldn't (as the third day is warm).  What you need to do is use a
> run-time calculator in conjunction with a daily integrator or run-time
> average to better implement your control.  Use the moving average to
> calculate the average over the last 24 hours, feed that to an equation of
> the form:
>
> Variable=LT(T_Moving_Average,16)
>
> Then feed the result of the Variable equation (a one or a zero) to a
> run-time calculator and the output from the run-time calculator to another
> equation:
>
> OK_24=GT(Runtime,72)
>
> Then use this equation as the control for your chilled ceiling.
>
> Jeff
>
>
> Jeff Thornton
> President - TESS, LLC
>
> 22 North Carroll Street - Suite 370
> Madison WI 53703 USA
>
> Phone: 608-274-2577
> Fax: 608-278-1475
> E-mail: thornton at tess-inc.com
> Web: www.tess-inc.com
>
>
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