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Ayman,<br>
I am not sure that I follow quite what you are doing. If your
floor is defined as a BOUNDARY and the back side temperature is set
to identical then that defines an air temperature on the other side
of the floor as being identical to the air temperature of your zone.
You can't then define the back side temperature as a ground
temperature; that would doubly define the temperature on the other
side of the floor. <br>
<br>
Best,<br>
David<br>
<br>
On 8/5/2011 09:50, Ayman Sarwa wrote:
<blockquote
cite="mid:1312555812.22299.YahooMailNeo@web161611.mail.bf1.yahoo.com"
type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><span><font class="Apple-style-span" face="arial,
helvetica, sans-serif" size="3">I am simulating single
zone by Trnbuild and Trnsys 17, I define the floor as <b>boundary
</b>and select boundary as <span><b>identical </b></span>when
I read the energy from inside surf. of floor conv. to
air and longwave </font><font class="Apple-style-span"
face="arial, helvetica, sans-serif">radiation</font><font
class="Apple-style-span" face="arial, helvetica,
sans-serif" size="3"> to other surfaces = NTYPE19 the
QCOMI of floor, and Temp. of inside floor, I note that, </font></span></div>
<div><span><font class="Apple-style-span" face="arial,
helvetica, sans-serif" size="3">for all cases when I
define the ground Temp i.e Input of type 56 by type 77
(ground temp ) or by const value , the QCOMI always keeps
+ve while T sur_in < T zone, i.e the energy transfer
from air zone to floor , but </font></span><span
class="Apple-style-span" style="font-family:
arial,helvetica,sans-serif;">QCOMI</span><span
class="Apple-style-span" style="font-family:
arial,helvetica,sans-serif;"> must be -ve, </span><span
class="Apple-style-span" style="font-family:
arial,helvetica,sans-serif;"><b>Why </b>?</span></div>
<div><span class="Apple-style-span" style="font-family:
arial,helvetica,sans-serif;">Any one can help me to Know
what is happen ?</span></div>
<div><span class="Apple-style-span" style="font-family:
arial,helvetica,sans-serif;">thanks</span></div>
<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt;"><span class="Apple-style-span" style="font-family:
tahoma,'new york',times,serif;">------</span><br>
</div>
<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt;"><font face="tahoma, 'new york', times, serif">Best
Regadrs</font></div>
<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt;"><font face="tahoma, 'new york', times, serif">Eng.
Ayman Mohamed</font></div>
<div style="font-size: 12pt;"><font class="Apple-style-span"
face="tahoma, 'new york', times, serif"><br>
</font></div>
</div>
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</blockquote>
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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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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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