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<p>Arian,</p>
<p> The obstruction height angles are measured from the horizontal
to the top of the obstruction. The plane in question (from which
the height angles are measured) for the roof/ceiling is the
horizontal plane. In fact, the plane in question is always
horizontal, regardless of the slope of the facade in which the
opening is located.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 06/22/2017 05:45, Arian Bahrami via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:668634814.352899.1498128301426@mail.yahoo.com">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:24px">
<div id="yui_3_16_0_ym19_1_1498127382878_3225">Dear all,</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225"><br>
</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225" dir="ltr">I want
to know if there is a specific solution to consider shading of
far objects on ceiling of a building. I had no problem when
it comes to shading on the E, W, N, S walls which seems to
define vertical openings for these walls and defining angles.
Should I use horizontal opening for ceiling? if so how to
define the obstruction angles and azimuth angles in this case
(respect to what plane exactly)? It seems difficult to
visualize the process.</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225" dir="ltr"><br>
</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225" dir="ltr">Best
Regards,</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225" dir="ltr"><br>
</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225" dir="ltr">Arian
Bahrami</div>
<div id="yui_3_16_0_ym19_1_1498127382878_3225" dir="ltr"><br>
</div>
</div>
<br>
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</blockquote>
<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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