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Fahri,<br>
I would not expect the heating demand to be the same between the
two. The ideal heating type does not take into account any of the
inefficiencies of delivering energy to the space. It is simply a
measure of the amount of energy that has to be put into the space in
order to maintain the space at a desired temperature. When you look
at the floor heating component, you have now introduced an
inefficiency of the energy transfer from the water to the layer in
which the pipes are embedded and you have introduced a somewhat
uncontrollable energy storage into the system. I would imagine that
the difference between your two numbers was largely because of the
energy required to heat up the concrete before it can effectively
transfer energy to the zone.<br>
Best,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/5/2012 04:01, Fahri Avci wrote:<br>
</div>
<blockquote
cite="mid:trinity-d9bcb06e-a460-4620-a6dd-0ecf7d76359b-1341478910168@3capp-webde-bs21.dlan.cinetic.de"
type="cite">
<div style="font-family: Verdana;font-size: 12.0px;">
<div>Dear all,<br>
</div>
<div><br>
</div>
<div>i have a problem between ideal heating type in trnbuild and
floor heating. <br>
</div>
<div>For the two heating systems i use the same building model
but the problem is i get two different heating demand values.<br>
</div>
<div><br>
</div>
<div>The heating demand with the floor heating, which i use
NTYPE 59 QALFL is much bigger than the heating demand for
ideal <br>
</div>
<div>heating type with NTYPE 30 QHEAT. Actually both have to
calculate the same heating demand because its the same<br>
</div>
<div>building construction.<br>
</div>
<div><br>
</div>
<div>ideal heating type: 13382 kJ/hr<br>
</div>
<div>floor heating: 19262 kJ/hr<br>
</div>
<div><br>
</div>
<div>
<div>My question is why is this so and how can i solve it that
both of them have the same heating demand <br>
</div>
(or with a little difference)? </div>
<div>i think the heating demand with floor heating is much
realistic than the other one with ideal heating.
<br>
i don't have any radiator types so i use the ideal heating and
try to simulate a heating system with radiators.
<br>
<br>
</div>
<div><br>
</div>
<div>
<div>Thank you for your helps,<br>
</div>
<div><br>
</div>
<div>Best Regards,<br>
</div>
<div><br>
</div>
<div>Fahri Avci<br>
</div>
<div><br>
</div>
<div>TUM München<br>
</div>
<div>Lehrstuhl Energiewirtschaft und Anwendungstechnik<br>
</div>
Arcisstraße 21 München</div>
<div><br>
</div>
</div>
<br>
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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
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