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Hi Nick,<BR>
<BR>
Heat pumps in this project are sized to meet peak heating load and the district plant will be used in case of heat pump failure. Thanks for sharing your thoughts. <BR>
<BR>
Ana<BR><BR> <BR>
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Subject: RE: [Equest-users] backup heating - LEED<BR>Date: Wed, 22 Dec 2010 12:07:45 -0600<BR>From: ncaton@smithboucher.com<BR>To: ananeddav@hotmail.com; equest-users@lists.onebuilding.org<BR><BR>
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<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Hi Ana,</SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"> </SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">If the primary heating source (heatpumps) is of sufficient capacity to handle the peak heating loads, I suspect they will be capable of providing the heating for most of the heating season… but I didn’t do your mechanical design and am unsure of the details.</SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Look up and determine for yourself: When will the backup plant heating be required and used under normal operation? Do the heatpumps lock out when the OA drops below a certain temperature or under other conditions? If so, are such conditions present in your model/weather file and to what extent? </SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">If the backup plant heating is only there redundantly (in case of equipment failure), then there’s no question: you needn’t include it in your model to begin with and the baseline should be electric.</SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"> </SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">The fine print below TG3.1.1A says you should select between Fossil Fuel and Electric, when both are used, based on “the predominant condition.” That term isn’t fleshed out anywhere I’m aware of, so if push came to shove you might defend your choice to use electric by comparing the number of hours in the heating season wherein the conditions you determined above are satisfied against those where they are not. </SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Those are my thoughts anyway, hope that helps!</SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">~Nick</SPAN></P>
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<P class=ecxMsoNormal><B><SPAN style="FONT-SIZE: 11pt; COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'">NICK CATON, E.I.T.</SPAN></B><B><SPAN style="COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'"></SPAN></B></P>
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<P class=ecxMsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Ana N.<BR><B>Sent:</B> Wednesday, December 22, 2010 8:40 AM<BR><B>To:</B> equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] backup heating - LEED</SPAN></P></DIV></DIV>
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<P class=ecxMsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Dear all,<BR> <BR>Does anyone know how LEED treats backup heating?<BR> <BR>I have a project with a district plant being used as a back up. The proposed design uses heat pumps sized to meet peak heating load. My first thought was to select the baseline system based on fossil fuel heating since the district plant uses fossil fuel. If I do so, I will have to select fossil fuel as primary heating source when I actually have zero fossil fuel consumption in my proposed case, which does not make much sense.” Required treatment of district thermal energy in LEED–NC version 2.2 and LEED for Schools” does not provide any specific guidance when district plant is used as a back up heating source. <BR> <BR>However “CHP Calculation Methodology for LEED-NC v2.0/v2.1 EA Credit 1 “states that Budget Building heating and cooling plant utilizes the backup energy source(s) of the Proposed Design.<BR>Although I do not have CHP in my project, this led me think I should use fossil fuel as a heating type to select the baseline system type.<BR><BR>Any opinions would be greatly appreciated.<BR><BR><BR><BR>Ana<BR><BR> </SPAN></P></DIV> </body>
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