Hey Jeff,<br><br>Thanks for the quick answer!!<br>Which run-time calculator do you mean? The Type 1233 run-time controller from the TESS Library?<br>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.<br>
Isn't there another way to solve that problem?<br>Sorry for bothering you!<br><br>Greets<br><br>Leo<br>
<br><br><div class="gmail_quote">2011/4/27 Jeff Thornton <span dir="ltr"><<a href="mailto:thornton@tess-inc.com" target="_blank">thornton@tess-inc.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div><div></div><div><Hi everyone,I am trying to connect a chilled ceiling to a moving average<br>
from the last 3 days.If the average ambient temperature is lower than 16<br>
degrees for 3 days in a row, the input temperature for the chilled ceiling<br>
should go up to 24 degrees. I am using Type 84 for that, but I am not<br>
sure about my input value(how to connect my moving average to my ambient<br>
temp) and how my equation for this should look like.I had the idea of a<br>
'greater than/lower than' equation but I can only turn it on and off with<br>
this one. Can anybody help??><br>
<br>
</div></div>Leo,<br>
<br>
I'm not sure a moving average is going to help you in this case as the<br>
average doesn't capture the effect you're looking for. For example,<br>
imagine you has two really cold days followed by a warm day. In the logic<br>
you described above, the chilled ceiling would go up to 24 degrees when it<br>
shouldn't (as the third day is warm). What you need to do is use a<br>
run-time calculator in conjunction with a daily integrator or run-time<br>
average to better implement your control. Use the moving average to<br>
calculate the average over the last 24 hours, feed that to an equation of<br>
the form:<br>
<br>
Variable=LT(T_Moving_Average,16)<br>
<br>
Then feed the result of the Variable equation (a one or a zero) to a<br>
run-time calculator and the output from the run-time calculator to another<br>
equation:<br>
<br>
OK_24=GT(Runtime,72)<br>
<br>
Then use this equation as the control for your chilled ceiling.<br>
<br>
Jeff<br>
<br>
<br>
Jeff Thornton<br>
President - TESS, LLC<br>
<br>
22 North Carroll Street - Suite 370<br>
Madison WI 53703 USA<br>
<br>
Phone: 608-274-2577<br>
Fax: 608-278-1475<br>
E-mail: <a href="mailto:thornton@tess-inc.com" target="_blank">thornton@tess-inc.com</a><br>
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<br>
</blockquote></div><br>