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Daniel,<br>
Often when writing controller models, I add an input or a
parameter to tell the controller whether it is operating in heating
mode (ie ON when a temperature is too low) or in cooling mode (ON
when the temperature is too high). Type22 does not have such a mode
so you might need to use two of them, one looking at the temperature
difference for heating times and one looking at an inverted
temperature difference for cooling.<br>
Kind regards,<br>
David<br>
<br>
<br>
On 4/15/2011 09:03, Daniel Bader wrote:
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<div class="WordSection1">
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Dear
TRNSYS-Users,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">I have a little problem to control my
floor-heating- and cooling-system:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">I use Type22 – Iterative feedback controller –
to regulate the massflowrate of the floor-system.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">The inlet temperature is controlled by the mean
outside temperature of the day before.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">In times when the floor is used for cooling the
building, the Type22-controller works perfectly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">But in times when heating is needed, the
controller doesn’t use the threshold-function to stop the
massflow if the rooms are getting too hot (because of
internal gains). <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Think for example at a room in winter with
outside temperature about 0°C. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">In the night and in the early hours there will
be a heating demand, so an inlet-temperature of about 22°C
is used for heating. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">When the room is used (with lots of internal
gains) the inlet temperature of 22°C is used for cooling!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">The problem is that you cannot control both
(heating and cooling).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Also by adding an on/off command to type22
(like: off when Tair > Twanted – I tried a lot more)
doesn’t work.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">See also the attached graph (I hope you can
understand the problem).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Does someone have experiences with that problem
to solve this problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">I would be very pleased for any help!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Thank you in advanced.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="line-height: 115%;"><span
style="color: rgb(31, 73, 125);">Kind regards / </span><span
style="color: rgb(31, 73, 125);">Freundliche Grüße<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height: 115%;"><span
style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height: 115%;"><span
style="color: rgb(31, 73, 125);">i.A. Dipl.-Ing.(FH)
Daniel Bader<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height: 115%;"><b><span
style="color: rgb(31, 73, 125);"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="color: rgb(31, 73, 125);">GN
Bauphysik Ingenieurgesellschaft mbH</span></b><b><span
style="color: rgb(31, 73, 125);"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Bahnhofstr.
27<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">70372
Stuttgart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Tel.:
0711-9548800<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Fax:
0711-564613<o:p></o:p></span></p>
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style="color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Geschäftsführer:
Dipl.-Ing. (FH) Manfred Finkenberger<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="color: rgb(31, 73,
125);">Sitz der Gesellschaft: Stuttgart, HRB 14870<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="color: rgb(31, 73,
125);"><o:p> </o:p></span></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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