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<TITLE>Re: [Equest-users] 90.1 Baseline HVAC System 7 - VAV w Reheat andBaseboard</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>We just got a review comment from GBCI stating to verify that we set our outside air to be shut off during night cycling in the baseline. So at least one reviewer interprets that requirement. We’ve always done it that way, but a lot of packaged equipment out there doesn’t actually have that capability.<BR>
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On 10/28/10 10:57 AM, "Bishop, Bill" <<a href="wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT COLOR="#000080"><FONT SIZE="2"><FONT FACE="Arial"><SPAN STYLE='font-size:10pt'>Jonathan,<BR>
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ASHRAE Standard 90.1-2007, Appendix G. section G3.1.2.4 requires fan cycling to meet heating and cooling loads during unoccupied hours. Appendix G. does not provide guidance on the use of baseboard heating. My approach has been to always leave baseboards out of the baseline building design.<BR>
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There is a discussion on the Bldg-Sim list today about ventilation rates per G3.1.2.5. There seem to be as many interpretations of this section as there are energy modelers. In the case of a proposed fan system that shuts off at night, I would model the baseline with a MIN-AIR-SCH, set to 0 during unoccupied hours, so that no ventilation is provided during nighttime fan cycling.<BR>
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Regards,<BR>
Bill<BR>
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<FONT SIZE="2"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'><B>From:</B> <a href="equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <B>On Behalf Of </B>Jonathan Smith<BR>
<B>Sent:</B> Thursday, October 28, 2010 10:28 AM<BR>
<B>To:</B> <a href="equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><BR>
<B>Subject:</B> [Equest-users] 90.1 Baseline HVAC System 7 - VAV w Reheat andBaseboard<BR>
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eQuesters: <BR>
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To comply with 90.1-2007 System Type 7, do I need to have supplemental heat with baseboards if I have it in the proposed system? Or, is it allowable to meet nighttime heating demands by cycling fans during unoccupied hours to meet nighttime setback temperature? <BR>
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In the proposed model during unoccupied periods I have fans OFF with baseboards providing supplemental heat.<BR>
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Thanks in advance for your feedback.<BR>
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</SPAN></FONT><FONT SIZE="1"><FONT FACE="Arial"><SPAN STYLE='font-size:9pt'><B>Jonathan R. Smith AIA LEED</B></SPAN></FONT><SPAN STYLE='font-size:9pt'><FONT FACE="Calibri, Verdana, Helvetica, Arial">®</FONT><FONT FACE="Arial"><B>AP<BR>
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