<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:10pt"><div>John:<br><br>In reference to the ASHRAE 90.1-2007 HVAC form that needs to be uploaded to LEED, I interpret the Mandatory Provisions, page 2 entries for 1% Summer DB, 1% Summer WB and 99.6% Winter Temp to mean that the model must use these design temperatures.<br><br>Do you agree?<br><br>Paul Diglio<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: arial,helvetica,sans-serif; font-size: 10pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> John T. Forester <JohnTF@BVHis.com><br><b><span style="font-weight: bold;">To:</span></b> "Bishop, Bill" <wbishop@pathfinder-ea.com><br><b><span style="font-weight: bold;">Cc:</span></b> "equest-users@lists.onebuilding.org"
<equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Wed, January 12, 2011 1:25:59 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [Equest-users] Design day for Appendix G Baseline sizing runs<br></font><br>
Hi Bill,<br><br>I've created custom design days in past projects based on the 1% CDD and 99.6% HDD and it has actually helped reduce unmet load hours by increasing coil sizes, especially in DOA systems. Chapter 14 of the ASHRAE Fundamentals book will give you the climatic data for your location. You might need the electronic version as I don't believe every location is printed in the hard text these days. The data also shows which month is the hottest and coldest. The data the bottom half of the page gives temperature ranges for drybulb and coincident DB/WB for each month. The difference in ranges each month will depend on your location. Here in Boston, the hottest month (July) has a DB range of 15.2°F and the coldest month (January) has a range of 13.1°F<br><br>I've also come across instances where the wizard somehow hard-codes erroneous temperatures causing many unmet load hours and troubleshooting will not get you
anywhere if eQuest is using the wrong design temperatures. Now, I make a point to check the CDD and HDD of all of my models.<br><br>John<br><br>John T. Forester, P.E., LEED AP, Mechanical Design Engineer I BVH Integrated Services I 617.658.9008 tel I 617.244.3753 fax I One Gateway Center Suite 506, Newton MA 02458 I <a target="_blank" href="http://www.bvhis.com">www.bvhis.com</a> I Hartford ● New Haven ● Boston<br>________________________________________<br>From: <a ymailto="mailto:equest-users-bounces@lists.onebuilding.org" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a ymailto="mailto:equest-users-bounces@lists.onebuilding.org" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] On Behalf Of Carol Gardner [<a ymailto="mailto:cmg750@gmail.com" href="mailto:cmg750@gmail.com">cmg750@gmail.com</a>]<br>Sent: Wednesday, January 12,
2011 12:32 PM<br>To: Bishop, Bill<br>Cc: <a ymailto="mailto:equest-users@lists.onebuilding.org" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>Subject: Re: [Equest-users] Design day for Appendix G Baseline sizing runs<br><br>Hi Bill,<br><br>I don't recommend using design days instead of the weather file at this time. I have heard in the past that the HDD and CDD schedules that are automatically generated don't actually work for sizing if you don't live in California. I can't remember the exact details of that rumor but perhaps someone else will. I also have heard in the past that it is better to use the weather files as using the design day method tends to underpredict the size of the systems. That's all we need! More hours loads not met, yikes!!<br><br>So it would be a significant amount of extra work for no real gain.<br><br>Cheers,<br><br>Carol<br><br>On Wed, Jan 12, 2011 at 9:16 AM, Bishop, Bill
<<a ymailto="mailto:wbishop@pathfinder-ea.com" href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a><mailto:<a ymailto="mailto:wbishop@pathfinder-ea.com" href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a>>> wrote:<br>I have been letting eQUEST determine baseline equipment capacities using the weather files selected by the wizard, rather than creating 99.6%/1% design days as allowed by G3.1.2.2.1. Does anyone recommend using design days for LEED/Appendix G baselines? If so, how do you determine DRYBULB-RANGE, or do you set it to zero to run the same DRYBULB-HIGH temperature 24/7/365? Does the design day method typically maximize baseline energy consumption compared to TMY/TMY2 weather files?<br><br>Thanks,<br>Bill<br><br>William Bishop, PE, BEMP, LEED® AP | Pathfinder Engineers & Architects LLP<br>Mechanical Engineer<br><br>[<a
href="https://mail.google.com/mail/html/compose/static_files/blank_quirks.html?ui=2&ik=367e06555b&view=att&th=12d7b3b4fb780b4d&attid=0.0.1&disp=emb&zw" target="_blank">https://mail.google.com/mail/html/compose/static_files/blank_quirks.html?ui=2&ik=367e06555b&view=att&th=12d7b3b4fb780b4d&attid=0.0.1&disp=emb&zw</a>]134 South Fitzhugh Street Rochester, NY 14608<br>T: (585) 325-6004 Ext. 114 F: (585) 325-6005<br><a ymailto="mailto:wbishop@pathfinder-ea.com" href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a><mailto:<a ymailto="mailto:wbishop@pathfinder-ea.com" href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a>> <a target="_blank" href="http://www.pathfinder-ea.com">www.pathfinder-ea.com</a><span><<a target="_blank"
href="http://www.pathfinder-ea.com/">http://www.pathfinder-ea.com/</a>></span><br>P Sustainability – the forest AND the trees. P<br><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
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