<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Dear Peter and Pasha,<br>Thank you for the quick and the useful response. <br>Actually, I want to see the effect of natural ventilation on overheating hours.<br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">And the only that I can calculate overheating hours is to check whether zone temperatures are over a certain limit by using hourly reports.<br>Do you think it would be ok to use NV for this purpose?<br>And do I get it right that energy savings in fan energy consumption is due to the ourside air supllied to the zone by NV?<br>Thanks<br><br>Best Regards<br>Sinan Senel<br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Pasha
Korber-Gonzalez <pasha.pkconsulting@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> Peter Hillermann <peterh@westallarchitects.com><br><b><span style="font-weight: bold;">Cc:</span></b> sinan senel <msinansenel@yahoo.com>; equest-users@lists.onebuilding.org<br><b><span style="font-weight: bold;">Sent:</span></b> Wed, July 21, 2010 4:11:46 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [Equest-users] Window operation<br></font><br>
<div>Yes, in addition to that you need to model/specify your building windows as "operable". If they are specified as a "fixed" window then the simulation will not "open" them to the outside air conditions and subsequent wind speed from the weather file.</div>
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<div>Always when trying to simulate some amount of NV you must have specified operable windows & window area separate from your fixed windows and window area AND you will have a temp schedule so that the program knows how you want it to react. Also remember that these attempts to represent energy savings from operable windows or NV strategies are only static calculations, therefore there are no iterations to take advantage of the dynamic principals of NV in DOE-2. AND this is not a good way to analyze thermal comfort of the occupants with NV design strategies. The only purpose for applying this approach in DOE-2 is to minimally represent potential energy savings (mostly fan energy) in your whole building analysis.</div>
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<div>Better tools (and typically more expensive tools) are available to properly analyze the dynamic characteristics of Natural Ventilation strategies & occupant thermal comfort, especially if you are trying to do this in support/compliance for the LEED credit. One tool is TAS (thermal analysis software), and maybe TRNSYS (I'm not exactly sure of it's capability), and of course CFD.</div>
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<div>pkg<br><br></div>
<div class="gmail_quote">On Wed, Jul 21, 2010 at 7:53 AM, Peter Hillermann <span dir="ltr"><<a rel="nofollow" ymailto="mailto:peterh@westallarchitects.com" target="_blank" href="mailto:peterh@westallarchitects.com">peterh@westallarchitects.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">Sinan Senel,</span></p>
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">Under HVAC systems there is an outside air tab with a natural ventilation tab. Use it with a schedule attached to temperature and you should be fine. There is even a textbox that says window probability open.</span></p>
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">Thanks,</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p>
<p class="MsoNormal"><b><span style="letter-spacing: 1pt; color: rgb(31, 73, 125); font-size: 10pt;" lang="DE">PETER HILLERMANN</span></b></p>
<p class="MsoNormal"><span style="letter-spacing: 1pt; color: rgb(31, 73, 125); font-size: 10pt;" lang="DE"> </span></p>
<p class="MsoNormal"><span style="letter-spacing: 1pt; color: rgb(31, 73, 125); font-size: 8pt;" lang="DE"><a rel="nofollow" ymailto="mailto:peterh@westallarchitects.com" target="_blank" href="mailto:peterh@westallarchitects.com"><span style="color: blue;">peterh@westallarchitects.com</span></a></span></p>
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"><img alt="e-signature" src="cid:1.595819331@web30606.mail.mud.yahoo.com" border="0" width="160" height="87"><img alt="USGBC-Logo" src="cid:2.595819331@web30606.mail.mud.yahoo.com" border="0" width="92" height="90"></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a rel="nofollow" ymailto="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a rel="nofollow" ymailto="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>sinan senel<br>
<b>Sent:</b> Wednesday, July 21, 2010 8:00 AM<br><b>To:</b> <a rel="nofollow" ymailto="mailto:equest-users@lists.onebuilding.org" target="_blank" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Window operation</span></p>
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<p class="MsoNormal">Dear all,<br>Does any of you know if we can model the exterior windows to be opened based on the zone temperatures?<br>For example I want to operate the exterior windows and open them if zone temperature exceeds<br>
23 degrees and outdoor temperature is higher than 15 degrees. <br>Is it possible?<br><br>Thank you in advance.<br><br>Best Regards<br>Sinan Senel</p></div></div>
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