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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hey Aaron,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I think the solution here is most related to your third question. The design was originally VAV systems with re-heat everywhere. The re-heats have since been VE’d out with local exceptions. The units are still variable volume but are only controlled by a single thermostat in most cases. If I were to model this from scratch, I would combine the spaces into single zones. I can go back and make the changes now but I’d rather not.. </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I just tested out one theory and it seems to do what I’m looking for, with zero unmet load hours. For any spaces that are not the “control” zone, I simply set the cooling/heating tstat schedules to “undefined”. This tells the program that there is no zonal heating or cooling control, which is how the systems are actually designed. I checked the max and min temperatures for each of these spaces for the year and they seem reasonable, and unmet load hours are zero. Some exterior spaces are seeing minimum temperatures as low as 51 deg F in the winter, but this is accepted and understood by the client.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For the baseline model I will define all tstat schedules to simulate the zonal re-heat requirement per ASHRAE. I think this solution seems okay?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dana<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Dahlstrom, Aaron [mailto:ADahlstrom@in-posse.com] <br><b>Sent:</b> Monday, May 07, 2012 9:38 AM<br><b>To:</b> Dana Etherington; Rob Hudson; R B; equest-users@lists.onebuilding.org<br><b>Subject:</b> RE: [Equest-users] Unmet Load Hours - VAV with no re-heat<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Dana – <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>A few questions:<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:"Calibri","sans-serif"'>1)</span><span style='font-size:7.0pt'> </span><span style='font-family:"Calibri","sans-serif"'>What are your expected return temperatures during cooling? If they are significantly higher than normal, would it be appropriate to increase your space cooling setpoint to match your expected return temperatures?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:"Calibri","sans-serif"'>2)</span><span style='font-size:7.0pt'> </span><span style='font-family:"Calibri","sans-serif"'>Is the air distribution designed to produce a thermally stratified zone? (eg displacement). If so, there is a <a href="http://www.energydesignresources.com/resources/publications/design-guidelines/design-guidelines-hvac-simulation-guidelines.aspx">nifty guide</a> from Energy Design Resources that will help you raise your return air temp while maintaining more traditional space air temps. <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:"Calibri","sans-serif"'>3)</span><span style='font-size:7.0pt'> </span><span style='font-family:"Calibri","sans-serif"'>Does the facility as designed actually have multiple temperature control “zones” per air handler – or one temperature control zone per air handler? If there is just one control zone per air handler – then perhaps per Table G3.1 entry 7 / proposed, you could justify less zones in your model. Changing the number of zones in a model is a lot of work – I’ve been through it before, and sometimes it means a from-scratch rebuild – but it is sometimes the only and/or best option to reduce unmet load hours. <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Aaron<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><div><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>Aaron Dahlstrom , PE, LEED® AP</span></b><span style='font-size:11.0pt;line-height:150%;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-size:11.0pt;line-height:150%;font-family:"AvantGarde Bk BT";color:#17365D'>In P</span></b><b><span style='font-size:11.0pt;line-height:150%;font-family:"AvantGarde Bk BT";color:#619428'>o</span></b><b><span style='font-size:11.0pt;line-height:150%;font-family:"AvantGarde Bk BT";color:#17365D'>sse</span></b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'> – </span><span style='font-size:8.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>A subsidiary of</span><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'> </span><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:#CC0000'>AKF</span></b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102 </span><span style='font-size:11.0pt;line-height:150%;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290</span><span style='font-size:11.0pt;line-height:150%;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'>e: ADahlstrom@in-posse.com | in posse web: <a href="http://www.in-posse.com/">www.in-posse.com</a> | akf web: <a href="http://www.akfgroup.com/">www.akfgroup.com</a></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:9.0pt;color:gray'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Dana Etherington<br><b>Sent:</b> Friday, May 04, 2012 11:45 AM<br><b>To:</b> Rob Hudson; R B; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Unmet Load Hours - VAV with no re-heat<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for the input guys. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So this is actually a new construction project and we’re performing the modeling for LEED certification. Rob, I originally entered process equipment electrical usage as eq. w/sf to the space and varied sensible heat gain % to the space based on what was reasonable. The corresponding process hot water and chilled water loads are accounted for via a detailed schedule and load the respective circulation loops. I’m hesitant to add internal energy sources, I feel like I’d be double-dipping..<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The units themselves are VAV and I do not believe there are individual VAV boxes at the zone level. So I just ran the model with VAV and included the re-heat coils, keeping everything else exactly the same as with the multi-zone model. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Results for VAV with re-heat, compared to MZS with no re-heat: overall energy cost for the year increased by only .2% and unmet load hours were slightly higher (applied a uniform re-heat delta T). Not sure which would be more acceptable by LEED reviewers…<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-Dana<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Rob Hudson <a href="mailto:[mailto:rdh4176@gmail.com]">[mailto:rdh4176@gmail.com]</a> <br><b>Sent:</b> Friday, May 04, 2012 11:23 AM<br><b>To:</b> R B; Dana Etherington; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Unmet Load Hours - VAV with no re-heat<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If you have heavy heating loads in the space, then should try to replicate that by putting in a heat load in the internal energy tab of the spaces. This will force the higher return temperatures and make it unnecessary to have re-heat coils. <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>This may work for you, because it seems like in reality, the spaces don't require the reheat coils and the spaces are kept to temperature.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Hope this is helpful,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Rob<o:p></o:p></p><div><p class=MsoNormal>On Fri, May 4, 2012 at 11:00 AM, R B <<a href="mailto:slv3sat@gmail.com" target="_blank">slv3sat@gmail.com</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal>I am assuming this is an existing building. I have always had this issue. I do all the stuff that you have and use the reheat also, if the unmet hours are too many. I also look at the SS-F report to see how low the temps are and when (hourly report) - if they are acceptable, then I leave the reheat out. You could also widen the throttling range - there might be unmet hours in the actual building - people just don't complain if it is a few degrees less/more than the thermostat. You should look at the hourly report to see if the heating coil is coming on (these reports are not very clean - since it is not clear for what point in the air stream eQuest is reporting the temps). Do you have VAV boxes - sometimes I have seen that a constant volume system has a VFD added to the fan, without VAV boxes in the space. You could reduce the min flows to zero and see if that helps. I haven't dug deeper into it, but I think the VAV system is going to set the supply temps low when even one zone needs cooling/less heating and so others will need reheat. If things are working smoothly in the existing building, then the zones must be similar and may not need too much variation in supply temps for different zones. I haven't used MZ - but that would probably work - what is the difference in energy consumption between the two options? I have not been comfortable with the economizer and MZ together.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>I will be curious to know what you find.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>-Rohini<o:p></o:p></p></div><div><div><div><p class=MsoNormal>On Fri, May 4, 2012 at 8:48 AM, Dana Etherington <<a href="mailto:Dana.Etherington@crbusa.com" target="_blank">Dana.Etherington@crbusa.com</a>> wrote:<o:p></o:p></p></div></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi folks,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We are modeling a large facility operating with multiple VAV AHUs with central heating and cooling coils, but no re-heat at the zones. There are high heat loads in the spaces and therefore higher return air temperatures than the norm. <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>When I remove the re-heat from the systems I have excessive unmet load hours (heating). I have specified “HEAT-SET-T” to activate the central heating coil. I also have cooling control set to “warmest” and heat control set to “coldest”. If I do not set the coil capacity it is still not meeting the loads. The only way I have been able to eliminate these unmet hours is by adding the re-heat back in or changing it to a multi-zone (MZS) system with all the same parameters. <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>If I model this scenario using the multi-zone system in eQuest to get around this would that be vastly different than VAV with no re-heat? Has anyone had this issue before? Any insight is appreciated. Thanks!<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>-Dana<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'>Mr. Dana Etherington, E.I.T., LEED AP BD+C </span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'>| <b>CRB </b>| One Kendall Square Ste B2202 | Cambridge, MA 02139</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'>Main:</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'> <a href="tel:617-475-3050" target="_blank">617-475-3050</a> <b>| Direct:</b> <a href="tel:617-475-3061" target="_blank">617-475-3061</a> | <b>Mobile:</b> <a href="tel:617-583-3009" target="_blank">617-583-3009</a> | <b>Fax:</b> <a href="tel:617-475-3052" target="_blank">617-475-3052</a> | <b>Ext: 6061</b></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959;layout-grid-mode:line'>Email:</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959;layout-grid-mode:line'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'><a href="mailto:dana.etherington@crbusa.com" target="_blank"><span style='color:#595959'>dana.etherington@crbusa.com</span></a> | <a href="http://www.crbusa.com/" target="_blank"><span style='color:#595959'>www.crbusa.com</span></a></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'>________________________________________________________________________________________</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'>This document may contain confidential information and is intended for use by the addressee only. If you are not </span></i><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'>the intended recipient, please do not transmit, copy, disclose, or utilize this communication in any manner. If you </span></i><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'>received this message in error, please notify the sender immediately and delete this message.</span></i><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959'> </span></i><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-family:Webdings;color:green'>ü</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:green'> Please consider the environment before printing this email.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></blockquote></div><p class=MsoNormal style='margin-bottom:12.0pt'><br><br>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></div><p class=MsoNormal><br><br clear=all><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>-- <br>Rob Hudson<o:p></o:p></p></div><p class=MsoNormal><br clear=all>This e-mail may contain information that is confidential, privileged or otherwise protected from disclosure. If you are not an intended recipient of this e-mail, do not duplicate or redistribute it by any means. Please delete it and any attachments and notify the sender that you have received it in error. Unintended recipients are prohibited from taking action on the basis of information in this e-mail. E-mail messages may contain computer viruses or other defects, may not be accurately replicated on other systems, or may be intercepted, deleted or interfered without the knowledge of the sender or the intended recipient. If you are not comfortable with the risks associated with e-mail messages, you may decide not to use e-mail to communicate with In Posse. <o:p></o:p></p></div></body></html>