<div>Fareed,</div>
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<div>it will strongly depend on the glass-quality (and the thermal quality of the walls) and the orientation, as well as on the climate. In fact even on the efficiency of the production of electricity for light, and the way the cooling and heating is done. </div>
<div>In fact you should take all of them into account when doing your optimisation study. Using ESP-r, coupled with GenOpt, I once had the sizes of the windows determined as a function of the consumed energy for lighting, cooling and heating. You could add overhangs and optimize their width as well. And of course, the code does not have to be ESP-r ....<br>
<br>Leen Peeters</div>
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<div class="gmail_quote">On Sat, Feb 6, 2010 at 5:59 PM, John Aulbach <span dir="ltr"><<a href="mailto:jra_sac@yahoo.com">jra_sac@yahoo.com</a>></span> wrote:<br>
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<div>Maria:</div>
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<div>Excellent information.</div>
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<div>Would you please describe what you mean by "free running mode"?</div>
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<div>Thank you.<br></div>
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<b><span style="FONT-WEIGHT: bold">From:</span></b> Maria Kordjamshidi <<a href="mailto:m_kordjamshidi@yahoo.com" target="_blank">m_kordjamshidi@yahoo.com</a>><br><b><span style="FONT-WEIGHT: bold">To:</span></b> BldgSim Mailing List <<a href="mailto:bldg-sim@onebuilding.org" target="_blank">bldg-sim@onebuilding.org</a>>; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>; <a href="mailto:trace-users@lists.onebuilding.org" target="_blank">trace-users@lists.onebuilding.org</a>; Fareed Syed <<a href="mailto:syedf@progressiveae.com" target="_blank">syedf@progressiveae.com</a>><br>
<b><span style="FONT-WEIGHT: bold">Sent:</span></b> Fri, February 5, 2010 9:47:04 PM<br><b><span style="FONT-WEIGHT: bold">Subject:</span></b> Re: [Bldg-sim] Impact of Overhangs<br></font></div>
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<div><font color="#00007f">Fareed</font></div>
<div><font color="#00007f"> </font></div>
<div><font color="#00007f">I have examined the effect of many parameters on the thermal performance of 6 typical houses (single storey and double storey houses) for a moderate climate of Sydney. a part of my report comes in the following for your consideration.</font></div>
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<div><span lang="EN-AU" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 'Times New Roman', 'serif'"><font color="#00007f">"Adding an overhang above all windows improved annual thermal performance of the typical houses in conditioned mode. However, this was not the case for the houses in free running mode. The houses presented different patterns of annual thermal performance in the different modes, responding to increments in overhang width.</font></span></div>
<span lang="EN-AU" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 'Times New Roman', 'serif'">
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><span lang="EN-AU" style="FONT-WEIGHT: normal; FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-STYLE: normal; FONT-FAMILY: 'Times New Roman', 'serif'"><font color="#00007f">Increases in overhang width of 1m resulted in an average of 4.8% enhancement in the house’s annual thermal performance in conditioned mode. The same overhang generally caused 3.7% deterioration in annual free running performance, while a slight improvement was observed in thermal performance in some cases.<span> </span>The reason for these different results is made clear when comparing the seasonal performances of each house in two different house modes.</font></span>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><span lang="EN-AU" style="FONT-WEIGHT: normal; FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-STYLE: normal; FONT-FAMILY: 'Times New Roman', 'serif'"><span lang="EN-AU" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 'Times New Roman', 'serif'"><font color="#00007f">When all the overhang widths were increased to 1m, the summer performance improved by an average of 26.6% in conditioned mode. The improvement decreased to an average of 8% for all houses in free running mode. The winter performance of the typical houses in this situation deteriorated by an average of 8.2% in conditioned mode and 11.7% in the free running mode. Thus the deterioration that was observed in the annual free running performance of some of the houses in response to the setting of overhang with a width of 1m for all windows would appear to owe more to deterioration in their winter performance and less improvement in their summer performance in free running mode than in conditioned mode."</font></span></span>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><span lang="EN-AU" style="FONT-WEIGHT: normal; FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-STYLE: normal; FONT-FAMILY: 'Times New Roman', 'serif'"><span lang="EN-AU" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 'Times New Roman', 'serif'"></span></span><font color="#00007f"> </font></p>
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<div><font color="#00007f">Hope this help</font></div>
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<div><font color="#00007f">Maria</font></div>
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<div><br><br>--- On <b>Sat, 2/6/10, Fareed Syed <i><<a href="mailto:syedf@progressiveae.com" target="_blank">syedf@progressiveae.com</a>></i></b> wrote:<br></div>
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><br>From: Fareed Syed <<a href="mailto:syedf@progressiveae.com" target="_blank">syedf@progressiveae.com</a>><br>Subject: [Bldg-sim] Impact of Overhangs<br>
To: "BldgSim Mailing List" <<a href="mailto:bldg-sim@onebuilding.org" target="_blank">bldg-sim@onebuilding.org</a>>, <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>, <a href="mailto:trace-users@lists.onebuilding.org" target="_blank">trace-users@lists.onebuilding.org</a><br>
Date: Saturday, February 6, 2010, 12:22 AM<br><br>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt">Folks,</span></p></div>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span></p></div>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt">Does anyone have good research data using simulations on the impact of overhangs and shadings for a typical building?</span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt">I am having hard time convincing architects to reduce the glazing. They will make it a glass building if they are given a chance.</span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt">I want to show them that for a 2 or 3 storied building with ton of glazing and few feet of overhang will not help the cooling/heating loads at all.</span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt">I would appreciate your input.</span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt">Thanks much.</span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt"> </span>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt">Fareed Syed EIT, LEED</span><sup><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Comic Sans MS'">®</span></sup><span style="FONT-SIZE: 10pt"> AP</span>
<p class="MsoNormal"><span style="FONT-SIZE: 9pt">Mechanical Engineer</span><b><span style="FONT-SIZE: 12pt"> </span></b><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Comic Sans MS'"><br></span><span style="FONT-SIZE: 10pt"><img height="40" alt="cid:image001.png@01C9B834.C9D7E7F0" width="200"></span><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Comic Sans MS'"></span>
<p class="MsoNormal"><span style="FONT-SIZE: 9pt">1811 4 Mile Rd NE<br>Grand Rapids, MI 49525</span>
<p class="MsoNormal"><span style="FONT-SIZE: 9pt"> </span>
<p class="MsoNormal" style="MARGIN-BOTTOM: 12pt"><span style="FONT-SIZE: 9pt">Phone: 616.361.2664 ext. 3247<br>Direct: 616.447.3447<br>Fax: 616.361.1493</span><span style="FONT-SIZE: 10pt"></span>
<p class="MsoNormal" style="MARGIN-BOTTOM: 12pt"><span style="FONT-SIZE: 9pt"><a href="http://us.mc514.mail.yahoo.com/mc/compose?to=syedf@progressiveae.com" target="_blank" rel="nofollow"><span style="COLOR: blue">syedf@progressiveae.com</span></a><br>
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