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The added pumping power is likely from the default 200 ft of static
pressure on the lake/well ground loop. Try changing this.<br>
<br>
I've only played with 1 of those system types but I found it was
very sensitive to the 4 temperatures on the "Miscellaneous" tab of
the chiller (and the defaults were not helpful -- but the values in
the help file were.<br>
<br>
Wish I could be of more help -- good luck.<br>
<br>
Brian<br>
<br>
On 6/6/2011 2:12 PM, <a class="moz-txt-link-abbreviated" href="mailto:TaylorRoberts@Eaton.com">TaylorRoberts@Eaton.com</a> wrote:
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<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am trying to model a HVAC system that
is composed of a central geothermal system that uses a
heater/chiller with back up boilers to provide hot and
chilled water to AHU for a VAV air-side system. Following
the advice I found on the archives from the Loop to Loop
Heatpump in eQuest discussion I modeled a system with a
L2LHP that uses a lake/well loop (see screen shot). I made
sure to zero out the static head for the GLHX and changed
the max hot water temp in the hot water loop to 130F to be
compatible with a heatpump. I compared this system to a
basic chiller/boiler VAV system to see if it showed any
signs of improvement and the results have been very
puzzling. The geothermal system is using slightly less
energy to cool but isn’t providing any heating to the
system. Instead the boilers are providing all of the
heating. When I remove the boilers to make the L2LHP provide
all of the heating it is performing terribly using an
enormous amount of electricity to heat. Also, I assumed that
there would be a pumping power increase but the L2LHP is
using about 3X the electricity as the boiler/chiller system
and this seems way too large. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone had any luck modeling a system
like this or has any ideas why my L2LHP model is using more
energy than a standard chiller/boiler system? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family: "Arial","sans-serif";">Taylor
Roberts, EIT</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";">Energy
Solutions Intern</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";">Energy
Solutions Group</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";">E
M C Engineers, Inc.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";">Eaton's
Electrical Services & Systems</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";">970-208-7917</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";"><a class="moz-txt-link-abbreviated" href="mailto:TaylorRoberts@Eaton.com">TaylorRoberts@Eaton.com</a></span><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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