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<p>Sabine,</p>
<p> It is very hard to say without looking at both the HAP and
TRNSYS models. If the TRNSYS model is giving you a higher heating
load than HAP look at what you have assumed for the temperature of
the ground in the Type56 model. In some cases by default the
ground temperature (on the back side of the GROUND_FLOOR surface)
is set to a constant value of 0 which gives your model a lot of
(unfair) free cooling and which causes heating loads to be
unrealistically high. <br>
</p>
<p> Also, I believe that HAP assumes that there are no internal
gains when it does it's peak heating load calculation (and may
also assume that there is no solar since I think it is doing a
steady state calculation). Make sure you understand what
assumptions HAP is making so that you can duplicate all of them in
TRNSYS.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 05/14/2017 06:03, sabine via
TRNSYS-users wrote:<br>
</div>
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cite="mid:VI1P193MB00648AEAFBBD56E9F6F2301F92E00@VI1P193MB0064.EURP193.PROD.OUTLOOK.COM"
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<p>Dear all,</p>
<p><br>
</p>
<p>I am trying to compare the results of a maximum heating load
of a single zone office from TRNSYS with results from the HAP
software.</p>
<p>I got this big difference in loads even though I entered the
same U values of walls and windows, same heating temperature,
and same minimum outside temperature.</p>
<p>Please if you can tell me why this is happening.</p>
<p><br>
</p>
<p>Regards;</p>
</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
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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