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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><div><p class="MsoNormal"><span style="color:#1F497D">Overestimated proposed design will result only if the proposed case also used a lighting power density. But if the proposed model is using design values for fixtures, then the proposed airflows and lighting power (not density) are based on the net occupied area. Therefore the baseline power (kW) should also be based on the “real” occupied area and not including the chases, even if they are lumped in to simplify geometry. So I’d say the opposite – by including the chase area in the baseline the total kW is too high compared to a proposed case that uses an actual kW.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">If I’m understanding, the GBCI actually DOES want you to calculate lighting power in terms of kW per occupied space and allocate it over the same modeled area as your proposed lighting kW – in this way both cases will have a modeled LPD that is lower than if only the occupied areas were used for those spaces.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">You do need a section in your narrative to explain the process of determining LPD, equipment power density, occupancy per area, etc in the context of the design documents that don’t include the chases. If I have it backwards and the proposed design is not using actual values, then you need to explain this to the reviewer in the narrative as to why the area basis for power calculations does need to be the same as the zone area.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">One possible course of action is to e-mail your reviewer for a clarification on what they are looking for to make sure things are square, outlining your understanding of the comments and proposed procedure. (Don’t ask open ended questions, provide the solution.)</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">Overall it sounds like the comment is clear, and as you mentioned originally if the change to the results are negligible, then just do it according to the comment and close the project out.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">David</span></p><p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><u><span style="color:black"> </span></u><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:black"> </span><span style="color:#1F497D"></span></p><p class="MsoNormal"><span style="color:#1F497D">David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP</span><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:#1F497D"></span></p><p class="MsoNormal"><u><span style="color:black"> </span></u><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><span style="color:black"> </span><span style="color:#1F497D"></span></p></div><p class="MsoNormal"><span style="color:#1F497D"> </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""> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>M. Shields<br>
<b>Sent:</b> Thursday, May 19, 2011 5:27 PM<br><b>To:</b> 'equest-users'<br><b>Subject:</b> Re: [Equest-users] Lighting Power Density</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><span style="color:#1F497D">The issue is that if I don’t include the chase in the LPD calc then it will over estimate the lighting because that area is included in the area for the model. Also I am concerned that they will say “well zone x is 100 sqft where your LPD calculation says that area is only 98 sqft”. I am fine with overestimating it, I just wondered if anyone has experience about how strict the reviewer might be for this.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">Thanks for the feedback.</span></p><p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal">
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