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Mayank,<br>
It is very hard to get matching results between two people using
the same software package, let alone between two different packages;
there are so many assumptions in modeling. Still, what you report is
a quite significant difference in sensitivity. I think the first
place to look is that in your *.bui, you have left the default
thermal capacitance of the zone as <br>
<br>
VOLUME= 3027.33 m3<br>
CAPACITANCE = 3632.79 kJ/K <br>
<br>
this accounts only for the thermal capacitance of the air in the
zone. It neglects the thermal capacitance of the furnishings. A more
typical value would be 18200 kJ/h (approximately 5 times the default
value).<br>
<br>
Kind regards,<br>
David<br>
<br>
On 2/14/2012 01:11, Mayank wrote:
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<div class="Section1">
<p class="MsoNormal">Hello Everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have made a simple cooling load
calculation model in
TRNSYS v16 and similar setup in E-quest. There is vast
variation in cooling
load when I put into outdoor air in the room.<o:p></o:p></p>
<p class="MsoNormal">In TRNSYS I used 2800 sqft area building
having 150 person
occupancy and according to ASHRAE 62 (ventilation rate
procedure) I calculated
1150 CFM outdoor air as fresh air. When I taking no outdoor
air the cooling
load is about 10 ton but when I put outdoor air through
ventilation (2.46 ACH)
the cooling load increases and reached at 42 ton.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And in E-quest it increase only 1 ton.<o:p></o:p></p>
<p class="MsoNormal"> Can anyone help me to find out the reason?
<o:p></o:p></p>
<p class="MsoNormal">I attached bui. File and tpf file.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Mayank <o:p></o:p></p>
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<br>
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<br>
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<br>
<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>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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