<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div style="font-family: arial, helvetica, sans-serif; ">Thanks David </div><div style="font-family: arial, helvetica, sans-serif; "> </div><div style="font-family: arial, helvetica, sans-serif; ">But , what is the importance or function of Tground as an Input in Type 56 ?</div><div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><br></font></div><div style="font-family: arial, helvetica, sans-serif; "><span class="Apple-style-span" style="font-family: 'times new roman', 'new york', times, serif; "><blockquote type="cite" style="margin-top: 1em; margin-right: 1em; margin-bottom: 1em; margin-left: 1em; display: block; "><div class="yui_3_2_0_5_131262198755197" style="font-family: arial, helvetica, sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-size: 12pt; "><div
class="yui_3_2_0_5_1312621987551107" style="font-family: arial, helvetica, sans-serif; font-size: 12pt; "><span class="yiv773644300Apple-style-span yui_3_2_0_5_1312621987551165" style="font-family: tahoma, times, serif; ">------</span><br></div><div class="yui_3_2_0_5_1312621987551109" style="font-family: arial, helvetica, sans-serif; font-size: 12pt; "><font face="tahoma, 'new york', times, serif">Best Regadrs</font></div><div class="yui_3_2_0_5_1312621987551111" 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="yiv773644300Apple-style-span" face="tahoma, 'new york', times, serif"><br></font></div></div><pre></pre></blockquote></span></div><div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; "><div style="font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; "><font
size="2" face="Arial"><hr size="1"><b><span style="font-weight:bold;">From:</span></b> David BRADLEY <d.bradley@tess-inc.com><br><b><span style="font-weight: bold;">To:</span></b> Ayman Sarwa <aymaneldakhl@yahoo.com><br><b><span style="font-weight: bold;">Cc:</span></b> "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu><br><b><span style="font-weight: bold;">Sent:</span></b> Friday, August 5, 2011 10:44 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [TRNSYS-users] Boundary wall<br></font><br><div id="yiv773644300">
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 type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-size: 12pt; font-family: arial, helvetica, sans-serif; ">
<div><span><font class="yiv773644300Apple-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="yiv773644300Apple-style-span" face="arial, helvetica, sans-serif">radiation</font><font class="yiv773644300Apple-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="yiv773644300Apple-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="yiv773644300Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">QCOMI</span><span class="yiv773644300Apple-style-span" style="font-family: arial, helvetica, sans-serif; "> must be -ve, </span><span class="yiv773644300Apple-style-span" style="font-family: arial, helvetica, sans-serif; "><b>Why </b>?</span></div>
<div><span class="yiv773644300Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">Any one can help me to Know
what is happen ?</span></div>
<div><span class="yiv773644300Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">thanks</span></div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; "><span class="yiv773644300Apple-style-span" style="font-family: tahoma, times, serif; ">------</span><br>
</div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; "><font face="tahoma, 'new york', times, serif">Best
Regadrs</font></div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; "><font face="tahoma, 'new york', times, serif">Eng.
Ayman Mohamed</font></div>
<div style="font-size:12pt;"><font class="yiv773644300Apple-style-span" face="tahoma, 'new york', times, serif"><br>
</font></div>
</div>
<pre><fieldset class="yiv773644300mimeAttachmentHeader"></fieldset>
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<br>
<pre class="yiv773644300moz-signature">--
***************************
David BRADLEY
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Thermal Energy Systems Specialists, LLC
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