<div>Nick,</div><div><br></div><div>I mostly agree with your approach, however I disagree on one point - even though desk lamps may be plugged-in and not permanently installed, if they are part of the overall lighting plan, then I think that they should be included in the proposed model and not in the baseline. If you have low footcandles in a space, but for whaterver reason, task lighting is not required (this architectural studio uses giant multi-touch computers for drawing), then task lights should be modeled equally in both models.</div>
<div><br></div><div>--</div><div>Karen</div><div><br></div><div><br><br><div class="gmail_quote">On Thu, Nov 17, 2011 at 4:36 AM, Carol Gardner <span dir="ltr"><<a href="mailto:gems@spiritone.com" target="_blank">gems@spiritone.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
tb,<br>
<br>
After, you have read through this couple of times, or looked at it
in an Excel table, you will figure out the changes you have to make
and make them. Always remember, do the proposed case first and then
back out the baseline, which must meet the applicable code. <br>
<br>
I think in a case like this building you would have had a different
result if you had attached, or put into the form, what you were
trying to do and how you did it. Your explanation is quite good and
it gives the reviewers something to look at besides numbers. Then
you get to exercise both sides of your brain.<br>
<br>
Cheers,<br>
<br>
Carol<div><div><br>
<br>
<br>
On 11/16/2011 10:26 PM, Tom Butler wrote:
</div></div><blockquote type="cite"><div><div>
<div>
<p class="MsoNormal">Sorry for the long attachment here, but
this LEED v2.2 EAc1 comment has me really confused so I want
to post it in its entirety.</p>
<p class="MsoNormal"> </p>
<p><span style="font-size:9.0pt"><span>1.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:9.0pt">The
EAc1 Narrative describes the interior lighting design target
for all studio spaces is 20 fc and that task lights have
been modeled identically in the Baseline and Proposed case.
However, according to the IESNA Lighting Handbook, ninth
edition, the minimum horizontal design illuminance for art
studios is 50 fc and for reading areas with handwritten
tasks is 30 fc. The ASHRAE allowances represent the power
allowance required to meet the minimum IESNA illuminance
requirements for various space types. It is inappropriate to
claim savings for designs that do not meet the minimum
lighting level requirements and model the additional
lighting power in the Baseline for lighting in the Proposed
that is required to perform the anticipated tasks.<br>
<br>
Also, Table 1.4 reports that 4.02 kW of process lighting has
been modeled in both cases, and it is assumed that this
represents the task lighting. Process lighting is limited to
the exempt interior lighting applications described in
Section 9.2.2.3. Task lighting is regulated and thus not
considered a process load. Section 9.6.3(b) does provide an
additional allowance for task lighting when the Space by
Space Method is used, but this may not be used for lighting
required to raise the ambient lighting to meet the required
lighting levels. If this additional allowance is used in the
Proposed design, the Baseline must be modeled with the same
power as the Proposed up to the 0.35 W/square foot
allowance. Please remove all task lighting power from the
Baseline model that is required to meet the IESNA
recommended illuminance levels. If any of the additional
allowance from Section 9.2.2.3 is applied to the Baseline
case, provide calculations verifying that this additional
lighting is not required in the Proposed case to meet the
required illuminance levels and confirming that this only
represents the portion of the additional allowance that is
used in the Proposed case.<br>
<br>
</span></p>
<p class="MsoNormal">My first question; isn’t low ambient-task
specific a commonly accepted energy use reduction strategy?
Why would I model a lighting design in the proposed solution
which isn’t installed and how would one determine, without an
extensive lighting design effort, the appropriate lighting
power to achieve 50fc, or 30fc? (not quite sure which one they
want) </p>
<p class="MsoNormal">Second, the spaces in question are
architecture college studios. If the task lighting is a plug
in desk lamp, provided by the student, then am I correct in
assuming it’s not regulated by 9.2.2.3? I’ve assumed 60W per
lamp as plug load, but there no way that the lamp type or
light distribution can be controlled as defined in 9.6.3.b,
nor is it a given that a lamp will be used. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m at a loss as to how to respond to this.
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks for any input.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">tb</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:gray">Tom Butler</span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:gray">Residential Green
Building Services Project Manager</span></b></p>
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