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Ensure your fan operation is consistently "constant". If fans are
"intermittent", OA is only introduced when the fan is on -- and the fan
run hours are likely different between the two system types depending
on capacity & control -- which will skew your results.<br>
<br>
Chris Mullinax wrote:
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<p class="MsoNormal">On three or four occasions I have used equest to
compare
traditional, small split systems (three to five ton) to a water source
heat
pump system in the same building. The WSHP system uses a cooling tower
and a small boiler. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried to make everything else identical by
creating the
first model and saving a copy of that model and changing the HVAC type
from
split system to WSHP.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On every occasion, split systems end up using
significantly less
energy than water source heat pumps systems.<o:p></o:p></p>
<p class="MsoNormal">The WSHPs are typically 16 SEER, the Splits 13
SEER.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I know there is additional energy associated
with pumps and
cooling towers. Is this a typical result? <o:p></o:p></p>
<p class="MsoNormal">It seems I've heard a lot of high about the
efficiency of
water source heat pumps.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";">Chris
Mullinax, P.E. <span style="color: rgb(0, 176, 80);">LEED AP</span></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";">pn:
770-387-1334</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";">fx:
770-387-1383</span><o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="mailto:chris@mullinaxsolutions.com"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: blue;">chris@mullinaxsolutions.com</span></a><o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.mullinaxsolutions.com"><span style="color: blue;">www.mullinaxsolutions.com</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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