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Nikola,<BR> <BR>I agree with you that justifying lighting savings in residential spaces is not an easy task . While ASHRAE Std. provides LPD for dormitory and multyfamily units , it is clear that we cannot take credit for lighting in residential dwellings unless we provide exceptional calculations according to CIR, dated 03/23/2007. We also need to include the unregulated lighting that is modeled identically in baseline and proposed. I had slightly higher fan power in baseline as compared to proposed, but I used addendum and CIR to calculate brake house power . <BR> <BR>Thanks,<BR>Ana <BR> <BR>
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From: nkravik@rumseyengineers.com<BR>To: ananeddav@hotmail.com; equest-users@lists.onebuilding.org<BR>Date: Fri, 12 Mar 2010 17:00:22 -0800<BR>Subject: RE: [Equest-users] LEED modeling- Unit heatersþ<BR><BR>
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<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Ana,</SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"> </SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">I agree with Bill Bishop’s comments using PTAC’s or PTHP for residential (depending on heating source.) </SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Not sure why the LEED reviewer says System type #5 or #7. Exceptions to G3.1.1 may apply-not sure if you’re conditioning the stairs.</SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">I had similar problem a while back (heating only by design proposed res bld, that per AHSRAE Appx G requirements needed cooling added the same as the baseline PTAC)</SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"> </SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">It’s been a while since I’ve worked on residential, but I remember the baseline PTAC fan power was coming too high using table G.3.1.2.9 and the lighting savings were substantial compared to baseline (I used the dormitory lighting at 1.1w/sf for the baseline, proposed was much lower LPD and how to justify it?….)</SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"> </SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">I have same understanding for serving identical areas, but we may be wrong. </SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Any other comments from the users? Anyone with res experience and LEED situation like this, so we can all learn?</SPAN></P>
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<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Thanks,</SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Nikola</SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"> </SPAN></P>
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<P class=ecxecxMsoNormal><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> Thursday, March 11, 2010 2:34 PM<BR><B>To:</B> equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] LEED modeling- Unit heatersþ</SPAN></P></DIV></DIV>
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<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"> </SPAN></P>
<P class=ecxecxMsoNormal>Thank you for your suggestions.<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"></SPAN></P>
<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"> </SPAN></P>
<P class=ecxecxMsoNormal> I am actually revising the model after it was reviewed by GBCI. <SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"></SPAN></P>
<P class=ecxecxMsoNormal>The model that was submitted had these spaces attached to PTAC systems (chilled water and hot water coils). My first thought was just to change a hot water coil to heat resistance in proposed. However, one of the reviewers comments was that all non-residential spaces should be modeled as system type #5 ( if the total conditioned building area is less than 150,000sf) or system type #7 (exceeds 150,000 sf). They also gave me an option of using system type #3 ( PSZ) for spaces where load varies substantially from other non-residential units. The model was done by someone else, but even if I had built this model I would not use VAV systems. I would probably go with PTAC for stairs and PSZ for mechanical rooms. Now, I am completely confused. <SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"></SPAN></P>
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<P class=ecxecxMsoNormal>Besides, when I model for LEED, I usually make my HVAC systems so that they serve identical areas in baseline and proposed design. Is this good understanding of Appendix G?<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"></SPAN></P>
<P class=ecxecxMsoNormal>Any thoughts and suggestions are appreciated.<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"></SPAN></P>
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<P class=ecxecxMsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"> </SPAN></P>
<P class=ecxecxMsoNormal>Ana<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'"></SPAN></P>
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