<div dir="ltr">It may depend on the pumping and controls you have for the WSHP loop. If you are not using a variable speed drive pump, (and three-way valves) for the WSHP system, then this would account for additional pumping energy.<div>
<br></div><div>What program are you using? Using eQuest, I've had good results with WSHP systems, it's possible that when you change the system type, it's not changing over very well.</div><div><br></div><div>
Can you send results (or if you're using eQuest, your inp and pd2 files).</div><div><br></div><div>--</div><div>Karen</div><div><br></div><div><br><br><div class="gmail_quote">On Mon, Oct 20, 2008 at 8:51 AM, Chris Mullinax <span dir="ltr"><<a href="mailto:chris@mullinaxsolutions.com">chris@mullinaxsolutions.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p>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. </p>
<p> </p>
<p>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.</p>
<p> </p>
<p>On every occasion, split systems end up using significantly less
energy than water source heat pumps systems.</p>
<p>The WSHPs are typically 16 SEER, the Splits 13 SEER.</p>
<p> </p>
<p> </p>
<p>I know there is additional energy associated with pumps and
cooling towers. Is this a typical result? </p>
<p>It seems I've heard a lot of high about the efficiency of
water source heat pumps.</p>
<p> </p>
<p> </p>
<p><span style="font-size:10.0pt">Thanks,</span></p>
<p><span style="font-size:10.0pt">Chris
Mullinax, P.E. <span style="color:#00B050">LEED AP</span></span></p>
<p> </p>
<p><span style="font-size:10.0pt">pn:
770-387-1334</span></p>
<p><span style="font-size:10.0pt">fx:
770-387-1383</span></p>
<p><a href="mailto:chris@mullinaxsolutions.com" target="_blank"><span style="font-size:10.0pt;color:blue">chris@mullinaxsolutions.com</span></a></p>
<p><a href="http://www.mullinaxsolutions.com" target="_blank"><span style="color:blue">www.mullinaxsolutions.com</span></a></p>
<p> </p>
<p> </p>
</div>
</div>
<br>_______________________________________________<br>
Bldg-sim mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
<br></blockquote></div><br></div></div>