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yep. how are you controlling the erv? interlocked with the supply
air fan so they're on all the time during occupied hours? that'll
do it. you spend more energy running the wheel and those
inefficient erv supply and erv exhaust fans than you save via the
energy transfer of the wheel.<br>
<br>
my experience has been to set the ervs to function based on a delta
t between the outdoor air and the exhaust air. the best delta t
will vary depending where your project is but in my hot/dry 2b zone
i've found a delta t of 20 was good, a delta t of 26 was peak before
the energy savings headed south again.<br>
<br>
also, you don't need to delete/remove the ervs to see energy
savings. just set up parametric runs with the different delta t you
want to test at & you can compare the savings via the comparison
reports. just don't forget to a) set the parametric run for delta
t, assign the unit(s) with ervs, and give it a delta t. these are
multiple inputs per air handler/erv.<br>
<br>
sample:<br>
<br>
<img src="cid:part1.08080506.05040102@gmail.com" alt=""><br>
<br>
On 11/30/12 12:59 PM, Andrew Clagett wrote:
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<p class="MsoNormal">Hello all. After finalizing my building and
obtaining what appeared to be reasonable output, I removed the
ERV devices (modeled at 85% efficient cross-flow air to air
heat exchangers) from the model to ascertain the energy
savings attributable to those devices.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And my total energy consumption went <b>DOWN</b>
over 6%! Inexplicably, ‘space cooling’ and ‘pumps & aux.’
energy consumption has decreased by a far larger amount than
‘space heating’ increased. I would have expected both of those
values to increase along with the ‘space heating’ energy
consumption (which did increase).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Anyone have any idea why that might be?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><b><span
style="font-size:11.5pt;color:#244061">Andrew Clagett, </span></b><span
style="font-size:9.0pt;color:gray">PE, LEED AP <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:gray">Mechanical <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:gray">d | 206.436.0494
</span><span
style="font-size:9.0pt;font-family:"Times New
Roman","serif";color:gray"> </span><span
style="color:gray">o | 206.448.3376 </span><span
style="font-size:9.0pt;font-family:"Times New
Roman","serif";color:gray"> </span><span
style="color:gray">e | <a class="moz-txt-link-abbreviated" href="mailto:andrewc@hargis.biz">andrewc@hargis.biz</a></span><span
style="font-size:9.0pt;font-family:"Times New
Roman","serif";color:gray"> </span><span
style="color:gray"> <a moz-do-not-send="true"
href="http://www.hargis.biz/vcards/Andrew%20Clagett.vcf"><span
style="color:gray">v-card</span></a></span><span
style="font-size:9.0pt;font-family:"Times New
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<p class="MsoNormal"><b><span
style="font-size:13.5pt;font-family:"Century
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style="font-size:6.0pt;font-family:"Century
Gothic","sans-serif";letter-spacing:6.0pt"> </span></b><span
style="font-size:12.0pt;font-family:"Times New
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<td style="padding:0in 0in 0in 0in">
<p class="MsoNormal"><span
style="font-size:10.5pt;color:#EEEEEE;background:#244061"> mechanical • electrical • telecommunications • security </span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><o:p></o:p></span></p>
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